1. An organic electroluminescent compound represented by the following formula 1:

wherein

Ring a is selected from the following formulas:

x represents NR₁₁、CR₁₂R₁₃O or S;

R₁each independently represents hydrogen, deuterium, halogen, or cyano;

R₁₁represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino;

R₁₂and R₁₃Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino; or are linked to each other to form a ring;

R₂₁is represented by-L₁-Ar₁Wherein if R is₂₁Is plural, then each R₂₁May be the same or different;

L₁each independently represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene;

Ar₁each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino;

a represents an integer of 1 to 4, b represents an integer of 1 to 10, wherein if a and b are integers of 2 or more, each R₁And each R₂₁May be the same or different;

represents a site fused to a 5-membered ring comprising X;

provided that if X is NR₁₁Then ring A is not

2. The organic electroluminescent compound according to claim 1, wherein at R₁₁To R₁₃、L₁And Ar₁Wherein the substituents of the substituted alkyl, substituted cycloalkyl, substituted heterocycloalkyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted silyl, and substituted amino are each independently at least one selected from the group consisting of: deuterium; halogen; a cyano group; a carboxyl group; a nitro group; a hydroxyl group; a phosphine oxide; (C1-C30) alkyl; halo (C1-C30) alkyl; (C2-C30) alkenyl; (C2-C30) alkynyl; (C1-C30) alkoxy; (C1-C30) alkylthio; (C3-C30) cycloalkyl; (C3-C30) cycloalkenyl; (3-to 7-membered) heterocycloalkyl; (C6-C30) aryloxy; (C6-C30) arylthio; (3-to 30-membered) heteroaryl unsubstituted or substituted with one or more (C6-C30) aryl; (C6-C30) aryl unsubstituted or substituted with at least one of one or more (C1-C30) alkyl groups and one or more (3-to 30-membered) heteroaryl groups; a tri (C1-C30) alkylsilyl group; a tri (C6-C30) arylsilyl group; di (C1-C30) alkyl (C6-C30) arylsilyl; (C1-C30) alkyldi (C6-C30) arylsilyl; an amino group; mono-or di- (C1-C30) alkylamino; mono-or di- (C2-C30) alkenylamino; mono-or di- (C6-C30) arylamino; mono-or di- (3-to 30-membered) heteroarylamino; (C1-C30) alkyl (C2-C30) alkenylamino; (C1-C30) alkyl (C6-C30) arylamino; (C1-C30) alkyl (3-to 30-membered) heteroarylamino; (C2-C30) alkenyl (C6-C30) arylamino; (C2-C30) alkenyl (3-to 30-membered) heteroarylamino; (C6-C30) aryl (3-to 30-membered) heteroarylamino; (C1-C30) alkylcarbonyl; (C1-C30) alkoxycarbonyl; (C6-C30) arylcarbonyl; (C6-C30) arylphosphine; bis (C6-C30) arylboronyl; di (C1-C30) alkylborono carbonyl; (C1-C30) alkyl (C6-C30) arylborono; (C6-C30) aryl (C1-C30) alkyl; and (C1-C30) alkyl (C6-C30) aryl.

3. The organic electroluminescent compound according to claim 1, wherein ring a is selected from the following formulae:

and

4. the organic electroluminescent compound according to claim 1, wherein ring a is selected from the following formulae:

5. the organic electroluminescent compound according to claim 1, wherein ring a is selected from the following formulae:

and

6. the organic electroluminescent compound according to claim 1, wherein L is₁Each independently represents a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted pyridinylene group.

7. The organic electroluminescent compound according to claim 1, wherein R is₁₁To R₁₃And Ar₁Each of the substituted or unsubstituted (3-to 30-membered) heteroaryl groups of (a) independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinolyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted dibenzoquinolyl group, a substituted or unsubstituted dibenzoquinazolinyl group, a substituted or unsubstituted dibenzoquinoxalinyl group, a substituted or unsubstituted indenopyridyl group, a substituted or unsubstituted indenopyrimidinyl group, a substituted or unsubstituted indenopyrazinyl group, a substituted or unsubstituted benzofuropyridinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, A substituted or unsubstituted benzofuropyrazinyl, a substituted or unsubstituted benzothienopyridinyl, a substituted or unsubstituted benzothienopyrimidinyl, a substituted or unsubstituted benzothienopyrazinyl, a substituted or unsubstituted carbazolyl, a substituted or unsubstituted dibenzofuranyl, or a substituted or unsubstituted dibenzothiophenyl.

8. The organic electroluminescent compound according to claim 1, wherein the compound represented by formula 1 is selected from the following compounds:

9. an organic electroluminescent material comprising the organic electroluminescent compound according to claim 1.

10. An organic electroluminescent device comprising the organic electroluminescent compound according to claim 1.

11. The organic electroluminescent device according to claim 10, wherein the organic electroluminescent compound is contained in a light-emitting layer or a hole-transporting region.

12. The organic electroluminescent device according to claim 11, wherein, when the organic electroluminescent compound is included in a light-emitting layer, the light-emitting layer further includes a compound represented by the following formula 2:

wherein

X₁And Y₁Each independently represents-N ═ NR₇-, -O-, or-S-, with the proviso that X₁And Y₁Any one of represents-N ═ and X₁And Y₁Another of (a) represents-NR₇-, -O-, or-S-;

r' represents a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3-to 30-membered) heteroaryl group;

R₂to R₇Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri (C1-C30) alkylsilylSubstituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi (C6-C30) arylsilyl, substituted or unsubstituted tri (C6-C30) arylsilyl, substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, substituted or unsubstituted mono-or di- (C1-C30) alkylamino, substituted or unsubstituted mono-or di- (C2-C30) alkenylamino, substituted or unsubstituted (C1-C30) alkyl (C2-C30) alkenylamino, substituted or unsubstituted mono-or di- (C6-C30) arylamino, substituted or unsubstituted (C1-C637) alkyl (C2-C30) arylamino, substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino, substituted or unsubstituted mono-C1-C30) arylamino, Substituted or unsubstituted mono-or di- (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C1-C30) alkyl (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C2-C30) alkenyl (C6-C30) arylamino, substituted or unsubstituted (C2-C30) alkenyl (3-to 30-membered) heteroarylamino, or substituted or unsubstituted (C6-C30) aryl (3-to 30-membered) heteroarylamino; or may be linked to an adjacent substituent to form one or more rings;

l' represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene; and is

f represents 1, g and h each independently represent 1 or 2, i represents an integer of 1 to 4, wherein if each of g to i is an integer of 2 or more, each R is₂To each R₄May be the same or different.

13. The organic electroluminescent device according to claim 12, wherein the compound represented by formula 2 is selected from the following compounds:

14. the organic electroluminescent device according to claim 11, wherein, when the organic electroluminescent compound is included in a light-emitting layer, the light-emitting layer further includes a compound represented by the following formula 3:

HAr-((L₂)_e-Ar₂)_d-----(3)

wherein

HAr represents a substituted or unsubstituted (3-to 20-membered) heteroaryl group containing one or more nitrogen atoms;

L₂each independently represents a substituted or unsubstituted (C6-C30) arylene group;

Ar₂each independently represents a substituted or unsubstituted (C6-C30) aryl group, or formula 4 below, with the proviso that Ar₂At least one of them is represented by formula 4;

y represents O, S, CR₄₁R₄₂N-, or NR₄₃；

R₄₁To R₄₃Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, or a substituted or unsubstituted (C)6-C30) aryl, or R₄₁And R₄₂May be linked to each other to form a ring;

R₃₁to R₃₈Each independently of the other represents₂The site of ligation; or represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, a substituted or unsubstituted (C1-C30) alkoxy group, a substituted or unsubstituted tri (C1-C30) alkylsilyl group, a substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl group, a substituted or unsubstituted (C1-C30) alkyldi (C6-C30) arylsilyl group, a substituted or unsubstituted tri (C6-C30) arylsilyl group, a substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, or-L.₄-N(Ar₃)(Ar₄) (ii) a Or may be linked to an adjacent substituent to form one or more rings;

L₄each independently represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene;

Ar₃and Ar₄Each independently represents hydrogen, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C2-C30) alkenyl, a fused ring group of substituted or unsubstituted one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, substituted or unsubstituted (C6-C30) aryl, or substituted or unsubstituted (3-to 30-membered) heteroaryl;

d represents an integer of 1 to 3, wherein if d is an integer of 2 or more, each ((L)₂)_e-Ar₂) May be the same or different;

e represents an integer of 0 to 2, wherein if e is 2, then each L₂May be the same or different; and is

Is represented by₂The site of ligation.

15. The organic electroluminescent device according to claim 14, wherein the compound represented by formula 3 is selected from the following compounds:

Background

An electroluminescent device (EL device) is a self-luminous display device, which has advantages in that it provides a wider viewing angle, a greater contrast ratio, and a faster response time. The first organic EL device was developed by Eastman Kodak in 1987 by using small aromatic diamine molecules and aluminum complexes as materials for forming a light emitting layer [ appl. phys. lett. [ appucation letters ]51,913,1987.

The most important factor determining the luminous efficiency in an organic electroluminescent device (OLED) is a light emitting material. Up to now, fluorescent materials have been widely used as light emitting materials. However, in view of the electroluminescence mechanism, since the phosphorescent light emitting material theoretically enhances the light emitting efficiency four (4) times as compared with the fluorescent light emitting material, the phosphorescent light emitting material has been widely studied. Up to now, iridium (III) complexes have been widely known as phosphorescent light-emitting materials, and include bis (2- (2 '-benzothienyl) -pyridine-N, C-3') (acetylacetone) iridium [ (acac) Ir (btp)₂]Tris (2-phenylpyridine) iridium [ Ir (ppy)₃]And bis (4, 6-difluorophenylpyridine-N, C2) picolinoylated iridium (Firpic).

Among the prior art, 4,4'-N, N' -dicarbazole-biphenyl (CBP) is the most well known phosphorescent host material. Recently, Pioneer electronics (Pioneer) (japan) and the like developed high-performance OLEDs using Bathocuproine (BCP), which is called a hole blocking material, and aluminum (III) bis (2-methyl-8-quinolinate) (4-phenylphenolate) (BAlq), and the like, as host materials.

However, while conventional materials provide good luminescent characteristics, they have the following disadvantages: (1) due to their low glass transition temperature and poor thermal stability, they may degrade during high temperature deposition processes in vacuum and may shorten the lifetime of the device. (2) The power efficiency of an OLED is given by [ (pi/voltage) × current efficiency ], and the power efficiency is inversely proportional to the voltage. Although OLEDs comprising phosphorescent host materials provide higher current efficiencies (cd/a) than OLEDs comprising fluorescent materials, a rather high driving voltage is required. Therefore, there is no advantage in power efficiency (lm/W). (3) Furthermore, the operational lifetime of OLEDs is short and there is still a need to improve the luminous efficiency.

In order to enhance light emitting efficiency, driving voltage, and/or life span characteristics, various materials or concepts for organic layers of organic electroluminescent devices have been proposed. However, they are not satisfactory in practical use.

Korean laid-open patent application nos. 2014-0055137 and 2015-0126340 disclose fused carbazole derivatives. However, there is a continuing need to develop organic electroluminescent materials for improving the performance of OLEDs.

Disclosure of Invention

Technical problem

It is an object of the present disclosure to provide an organic electroluminescent compound which is effective in producing an organic electroluminescent device having improved driving voltage, luminous efficiency, life characteristics, and/or power efficiency. It is another object of the present disclosure to provide an organic electroluminescent device comprising the organic electroluminescent compound.

Solution to the problem

Compounds having aryl moieties may exhibit high stability when used in electrical devices. The present inventors found that phenanthrene-based compounds have higher HOMO, LUMO and triplet energy gaps (E) than anthracene-based compounds_T) And thus, the phenanthrene-based compound is introduced into the organic electroluminescent device. As a result, the stability ratio was confirmedThe case of introducing the anthracene-based compound is higher. This can also be explained by the Clar's rule. That is, this higher stability appears to be due to the action of the phenanthrene structure having lower bridged conjugation and steric hindrance than the anthracene structure. More specifically, the present inventors have found that the above object can be achieved by an organic electroluminescent compound represented by the following formula 1:

wherein

Ring a is selected from the following formulas:

x represents NR₁₁、CR₁₂R₁₃O or S;

R₁each independently represents hydrogen, deuterium, halogen, or cyano;

R₁₁represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino;

R₁₂and R₁₃Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino; or are linked to each other to form a ring;

R₂₁is represented by-L₁-Ar₁Wherein if R is₂₁Is plural, then each R₂₁May be the same or different;

L₁each independently represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene;

Ar₁each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino;

a represents an integer of 1 to 4, b represents an integer of 1 to 10, wherein if a and b are integers of 2 or more, each R₁And each R₂₁May be the same or different;

represents a site fused to a 5-membered ring comprising X;

provided that if X is NR₁₁Then ring A is not

The invention has the advantages of

By using the organic electroluminescent compounds of the present disclosure, organic electroluminescent devices having low driving voltage, high luminous efficiency, excellent life characteristics, and/or high power efficiency can be produced.

Detailed Description

Hereinafter, the present disclosure will be described in detail. However, the following description is intended to explain the disclosure and is not meant to limit the scope of the disclosure in any way.

The term "organic electroluminescent compound" in the present disclosure means a compound that can be used in an organic electroluminescent device. The organic electroluminescent compound may be contained in any layer constituting the organic electroluminescent device, if necessary.

The term "organic electroluminescent material" in the present disclosure means a material that may be used in an organic electroluminescent device and may include at least one compound. The organic electroluminescent material may be contained in any layer constituting the organic electroluminescent device, if necessary. For example, the organic electroluminescent material may be a hole injection material, a hole transport material, a hole assist material, a light emission assist material, an electron blocking material, a light emitting material (including a host material and a dopant material), an electron buffering material, a hole blocking material, an electron transport material, an electron injection material, or the like.

The organic electroluminescent material of the present disclosure may include at least one compound represented by formula 1. The compound represented by formula 1 may be included in a hole injection layer, a hole transport layer, a hole assist layer, a light emission assist layer, an electron blocking layer, a light emitting layer, an electron buffer layer, a hole blocking layer, an electron transport layer, and/or an electron injection layer, etc., but is not limited thereto. The compound represented by formula 1 may be included in at least one of the layers constituting the hole transport region, but is not limited thereto. When included in the hole transport layer, the hole assist layer, or the light emission assist layer of the hole transport region, the compound represented by formula 1 may be included as a hole transport material, a hole assist material, or a light emission assist material. In addition, when included in the light emitting layer, the compound represented by formula 1 may be included as a host material, but is not limited thereto. Herein, the host material may be a host material of a blue, green, or red organic electroluminescent device.

Hereinafter, the compound represented by formula 1 will be described in more detail.

Herein, the term "(C1-C30) alkyl" means a straight or branched chain alkyl group having 1 to 30 carbon atoms constituting the chain, wherein the number of carbon atoms is preferably 1 to 20, and more preferably 1 to 10. The above alkyl group may include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl and the like. The term "(C2-C30) alkenyl" means a straight or branched chain alkenyl group having 2 to 30 carbon atoms making up the chain, wherein the number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10. The above alkenyl group may include vinyl, 1-propenyl, 2-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methylbut-2-enyl and the like. The term "(C2-C30) alkynyl" means a straight or branched chain alkynyl group having 2 to 30 carbon atoms making up the chain, whereinThe number of carbon atoms is preferably 2 to 20, and more preferably 2 to 10. The above alkynyl group may include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-methylpent-2-ynyl and the like. The term "(C3-C30) cycloalkyl" means a monocyclic or polycyclic hydrocarbon having 3 to 30 ring backbone carbon atoms, wherein the number of carbon atoms is preferably 3 to 20, and more preferably 3 to 7. The cycloalkyl group may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclohexylmethyl and the like. The term "(3-to 7-membered) heterocycloalkyl" means a cycloalkyl group having 3 to 7, preferably 5 to 7 ring backbone atoms and containing at least one heteroatom selected from the group consisting of B, N, O, S, Si and P, and preferably consisting of O, S and N. The above-mentioned heterocycloalkyl group may include tetrahydrofuran, pyrrolidine, tetrahydrothiophene (thiolan), tetrahydropyran and the like. The term "(C6-C30) (arylene) means a monocyclic or fused ring group derived from an aromatic hydrocarbon having 6 to 30 ring backbone carbon atoms, wherein the number of ring backbone carbon atoms is preferably 6 to 25, and more preferably 6 to 18. The above (arylene) group may be partially saturated, and may contain a spiro structure. The above aryl group may include phenyl, biphenyl, terphenyl, naphthyl, binaphthyl, phenylnaphthyl, naphthylphenyl, phenylterphenyl, fluorenyl, phenylfluorenyl, benzofluorenyl, dibenzofluorenyl, phenanthryl, phenylphenanthryl, anthracenyl, indenyl, triphenylenyl, pyrenyl, tetracenyl, perylenyl, perylene, and the like,An alkyl group, a naphthonaphthyl group, a fluoranthenyl group, a spirobifluorenyl group, an azulenyl group, a tetramethyldihydrophenanthryl group, and the like. More specifically, the above-mentioned aryl group may include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, benzanthryl, 1-phenanthryl, 2-phenanthryl, 3-phenanthryl, 4-phenanthryl, 9-phenanthryl, naphthonaphthyl, pyrenyl, 1-Base 2-Base 3-Base, 4-Base 5-Base 6-Radical, benzo [ c]Phenanthryl, benzo [ g ]]1-triphenylene group, 2-triphenylene group, 3-triphenylene group, 4-triphenylene group, 1-fluorenyl group, 2-fluorenyl group, 3-fluorenyl group, 4-fluorenyl group, 9-fluorenyl group, benzo [ a ] a]Fluorenyl, benzo [ b ]]Fluorenyl, benzo [ c)]Fluorenyl, dibenzofluorenyl, 2-biphenyl, 3-biphenyl, 4-biphenyl, o-terphenyl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-quaterphenyl, 3-fluoranthenyl, 4-fluoranthenyl, 8-fluoranthenyl, 9-fluoranthenyl, benzofluoranthenyl, o-tolyl, m-tolyl, p-tolyl, 2, 3-xylyl, 3, 4-xylyl, 2, 5-xylyl, mesitylyl, o-cumenyl, m-cumenyl, p-tert-butylphenyl, p- (2-phenylpropyl) phenyl, 4 '-methylbiphenyl, 4' -tert-butyl-p-terphenyl-4-yl, 9-dimethyl-1-fluorenyl, 9-dimethyl-2-fluorenyl, 9-dimethyl-3-fluorenyl, 9-dimethyl-4-fluorenyl, 9-diphenyl-1-fluorenyl, 9-diphenyl-2-fluorenyl, 9-diphenyl-3-fluorenyl, 9-diphenyl-4-fluorenyl, 11-dimethyl-1-benzo [ a ] a]Fluorenyl, 11-dimethyl-2-benzo [ a ]]Fluorenyl, 11-dimethyl-3-benzo [ a ]]Fluorenyl, 11-dimethyl-4-benzo [ a ]]Fluorenyl, 11-dimethyl-5-benzo [ a ]]Fluorenyl, 11-dimethyl-6-benzo [ a ]]Fluorenyl, 11-dimethyl-7-benzo [ a ]]Fluorenyl, 11-dimethyl-8-benzo [ a ]]Fluorenyl, 11-dimethyl-9-benzo [ a ]]Fluorenyl, 11-dimethylRadical-10-benzo [ a ]]Fluorenyl, 11-dimethyl-1-benzo [ b ]]Fluorenyl, 11-dimethyl-2-benzo [ b ]]Fluorenyl, 11-dimethyl-3-benzo [ b ]]Fluorenyl, 11-dimethyl-4-benzo [ b ]]Fluorenyl, 11-dimethyl-5-benzo [ b ]]Fluorenyl, 11-dimethyl-6-benzo [ b ]]Fluorenyl, 11-dimethyl-7-benzo [ b ]]Fluorenyl, 11-dimethyl-8-benzo [ b ]]Fluorenyl, 11-dimethyl-9-benzo [ b ]]Fluorenyl, 11-dimethyl-10-benzo [ b ]]Fluorenyl, 11-dimethyl-1-benzo [ c ]]Fluorenyl, 11-dimethyl-2-benzo [ c ]]Fluorenyl, 11-dimethyl-3-benzo [ c ]]Fluorenyl, 11-dimethyl-4-benzo [ c ]]Fluorenyl, 11-dimethyl-5-benzo [ c ]]Fluorenyl, 11-dimethyl-6-benzo [ c ]]Fluorenyl, 11-dimethyl-7-benzo [ c ]]Fluorenyl, 11-dimethyl-8-benzo [ c ]]Fluorenyl, 11-dimethyl-9-benzo [ c ]]Fluorenyl, 11-dimethyl-10-benzo [ c ]]Fluorenyl, 11-diphenyl-1-benzo [ a ]]Fluorenyl, 11-diphenyl-2-benzo [ a ]]Fluorenyl, 11-diphenyl-3-benzo [ a ]]Fluorenyl, 11-diphenyl-4-benzo [ a ]]Fluorenyl, 11-diphenyl-5-benzo [ a ]]Fluorenyl, 11-diphenyl-6-benzo [ a ]]Fluorenyl, 11-diphenyl-7-benzo [ a ]]Fluorenyl, 11-diphenyl-8-benzo [ a ]]Fluorenyl, 11-diphenyl-9-benzo [ a ]]Fluorenyl, 11-diphenyl-10-benzo [ a ]]Fluorenyl, 11-diphenyl-1-benzo [ b ]]Fluorenyl, 11-diphenyl-2-benzo [ b ]]Fluorenyl, 11-diphenyl-3-benzo [ b ]]Fluorenyl, 11-diphenyl-4-benzo [ b ]]Fluorenyl, 11-diphenyl-5-benzo [ b ]]Fluorenyl, 11-diphenyl-6-benzo [ b ]]Fluorenyl, 11-diphenyl-7-benzo [ b ]]Fluorenyl, 11-diphenyl-8-benzo [ b ]]Fluorenyl, 11-diphenyl-9-benzo [ b ]]Fluorenyl, 11-diphenyl-10-benzo [ b ]]Fluorenyl, 11-diphenyl-1-benzo [ c ]]Fluorenyl, 11-diphenyl-2-benzo [ c ]]Fluorenyl, 11-diphenyl-3-benzo [ c ]]Fluorenyl, 11-diphenyl-4-benzo [ c ]]Fluorenyl, 11-diphenyl-5-benzo [ c ]]Fluorenyl, 11-diphenyl-6-benzo [ c ]]Fluorenyl, 11-diphenyl-7-benzo [ c ]]Fluorenyl, 11-diphenyl-8-benzo [ c ]]Fluorenyl, 11-diphenyl-9-benzo [ c ]]Fluorenyl, 11-diphenyl-10-benzo [ c ]]Fluorenyl, 9,10, 10-tetramethyl-9, 10-dihydro-1-phenanthryl, 9,10, 10-tetramethyl-9, 10-dihydro-2-phenanthryl, 9,10, 10-tetramethyl-9, 10-dihydro-3-phenanthryl, 9,10, 10-tetramethyl-9, 10-dihydro-4-phenanthryl, and the like.

The term "(3-to 30-membered) (arylene) heteroaryl" means an aryl group having 3 to 30 ring backbone atoms and including at least one, preferably 1 to 4 heteroatoms selected from the group consisting of B, N, O, S, Si and P. The above-mentioned heteroaryl group may be a monocyclic ring, or a condensed ring condensed with at least one benzene ring; may be partially saturated; may be a heteroaryl group formed by linking at least one heteroaryl or aryl group to a heteroaryl group via one or more single bonds; and may comprise a spiro structure. The above-mentioned heteroaryl group may include monocyclic heteroaryl groups such as furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, and pyridazinyl groups, and condensed ring type heteroaryl groups such as benzofuranyl, benzothienyl, isobenzofuranyl, dibenzofuranyl, dibenzothienyl, dibenzoselenophenyl, naphthobenzofuranyl, naphthobenzothienyl, benzofuroquinolinyl, benzofuroquinazolinyl, benzofuropyrimidinyl, naphthofuropyrimidinyl, benzothienoquinolinyl, benzothienoquinazolinyl, benzothienonaphtenonaphtenonaphthyridinyl, benzothienopyrimidinyl, naphthothienopyrimidinyl, naphthothienothienopyrimidyl, pyrazinyl, and pyridazinyl groups, and the like, Pyrimidoindolyl, benzopyrimidinoindolyl, benzofuropyrazinyl, naphthofuropyrazinyl, benzothienopyrazinyl, naphthothienopyrazinyl, pyrazinoindolyl, benzopyrazinoindolyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzindolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, benzoquinazolinyl, quinoxalinyl, benzoquinoxalinyl, naphthyridinyl, carbazolyl, benzocarbazolyl, dibenzocarbazolyl, phenoxazinyl, phenothiazinyl, phenanthridinyl, benzodioxolyl, dihydroacridinyl, benzotriazolylphenoxazinyl, imidazopyridinyl, benzopyranoquinazolinyl, thiobenzopyranoquinazolinyl, dimethylbenzopyrimidyl, benzothiophenyl, indolylenyl, benzoxazolyl, indolizinyl, benzoxazolyl, cinnolinyl, quinazolinyl, benzoxazolinyl, benzoxazolyl, pyridyl, benzoxazolyl, and benzothiazolyl, Indolocarbazolyl, indenocarbazolyl, and the like. More specifically, the above-mentioned heteroaryl group may include 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, pyrazinyl, 2-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, 6-pyrimidinyl, 1,2, 3-triazin-4-yl, 1,2, 4-triazin-3-yl, 1,3, 5-triazin-2-yl, 1-imidazolyl, 2-imidazolyl, 1-pyrazolyl, 1-indolinyl, 2-indolinyl, 3-indolinyl, 5-indolinyl, 6-indolinyl, 7-indolinyl, 8-indolinyl, 2-imidazopyridinyl, 3-imidazopyridinyl, 5-imidazopyridinyl, and the like, 6-imidazopyridinyl, 7-imidazopyridinyl, 8-imidazopyridinyl, 3-pyridyl, 4-pyridyl, 1-indolyl, 2-indolyl, 3-indolyl, 4-indolyl, 5-indolyl, 6-indolyl, 7-indolyl, 1-isoindolyl, 2-isoindolyl, 3-isoindolyl, 4-isoindolyl, 5-isoindolyl, 6-isoindolyl, 7-isoindolyl, 2-furyl, 3-furyl, 2-benzofuryl, 3-benzofuryl, 4-benzofuryl, 5-benzofuryl, 6-benzofuryl, 7-benzofuryl, 1-isobenzofuryl, 3-isobenzofuryl, 4-isobenzofuranyl group, 5-isobenzofuranyl group, 6-isobenzofuranyl group, 7-isobenzofuranyl group, 2-quinolyl group, 3-quinolyl group, 4-quinolyl group, 5-quinolyl group, 6-quinolyl group, 7-quinolyl group, 8-quinolyl group, 1-isoquinolyl group, 3-isoquinolyl group, 4-isoquinolyl group, 5-isoquinolyl group, 6-isoquinolyl group, 7-isoquinolyl group, 8-isoquinolyl group, 2-quinoxalyl group, 5-quinoxalyl group, 6-quinoxalyl group, 1-carbazolyl group, 2-carbazolyl group, 3-carbazolyl group, 4-carbazolyl group, 9-carbazolyl group, azacarbazolyl-1-yl group, azacarbazolyl-2-yl group, azacarbazolyl group, Azacarbazolyl-3-yl, azacarbazolyl-4-yl, azacarbazolyl-5-yl, azacarbazolyl-6-yl, azacarbazolyl-7-yl, azacarbazolyl-8-yl, azacarbazolyl-9-yl, 1-phenanthridinyl, 2-phenanthridinyl, 3-phenanthridinyl, 4-phenanthridinyl, 6-phenanthridinyl, 7-phenanthridinyl, 8-phenanthridinyl, 9-phenanthridinyl, 10-phenanthridinyl, 1-acridinyl, 2-acridinyl, 3-acridinyl, 4-acridinyl, 9-acridinyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-oxadiazolyl, 5-oxadiazolyl, 3-furazanyl, 2-thienyl, 3-thienyl, 2-methylpyrrol-1-yl, 2-methylpyrrol-3-yl, 2-methylpyrrol-4-yl, 2-methylpyrrol-5-yl, 3-methylpyrrol-1-yl, 3-methylpyrrol-2-yl, 3-methylpyrrol-4-yl, 3-methylpyrrol-5-yl, 2-tert-butylpyrrol-4-yl, 3- (2-phenylpropyl) pyrrol-1-yl, 2-methyl-1-indolyl, 4-methyl-1-indolyl, 2-methyl-3-indolyl, 4-methyl-3-indolyl, 2-tert-butyl-1-indolyl, 4-tert-butyl-1-indolyl, 2-tert-butyl-3-indolyl, 4-tert-butyl-3-indolyl, 1-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzofuranyl, 1-dibenzothiophenyl, 2-dibenzothiophenyl, 3-dibenzothiophenyl, 4-dibenzothiophenyl, 1-naphtho- [1,2-b ] -benzofuranyl, 2-naphtho- [1,2-b ] -benzofuranyl, 3-naphtho- [1,2-b ] -benzofuranyl, 4-naphtho- [1,2-b ] -benzofuranyl, 2-tert-butyl-1-indolyl, 2-tert-butyl-3-indolyl, 4-tert-butyl-3-dibenzofuranyl, 4-dibenzofuranyl, 2-dibenzofuranyl, 3-dibenzofuranyl, 4-dibenzothiophenyl, 1, 2-naphtho- [1,2-b ] -benzofuranyl, 2, 4-naphtho, 5-naphtho- [1,2-b ] -benzofuranyl, 6-naphtho- [1,2-b ] -benzofuranyl, 7-naphtho- [1,2-b ] -benzofuranyl, 8-naphtho- [1,2-b ] -benzofuranyl, 9-naphtho- [1,2-b ] -benzofuranyl, 10-naphtho- [1,2-b ] -benzofuranyl, 1-naphtho- [2,3-b ] -benzofuranyl, 2-naphtho- [2,3-b ] -benzofuranyl, 3-naphtho- [2,3-b ] -benzofuranyl, 4-naphtho- [2,3-b ] -benzofuranyl, 5-naphtho- [2,3-b ] -benzofuranyl, 6-naphtho- [2,3-b ] -benzofuranyl, 7-naphtho- [2,3-b ] -benzofuranyl, 8-naphtho- [2,3-b ] -benzofuranyl, 9-naphtho- [2,3-b ] -benzofuranyl, 10-naphtho- [2,3-b ] -benzofuranyl, 1-naphtho- [2,1-b ] -benzofuranyl, 2-naphtho- [2,1-b ] -benzofuranyl, 3-naphtho- [2,1-b ] -benzofuranyl, 4-naphtho- [2,1-b ] -benzofuranyl, 5-naphtho- [2,1-b ] -benzofuranyl, 6-naphtho- [2,1-b ] -benzofuranyl, 7-naphtho- [2,1-b ] -benzofuranyl, 8-naphtho- [2,1-b ] -benzofuranyl, 9-naphtho- [2,1-b ] -benzofuranyl, 10-naphtho- [2,1-b ] -benzofuranyl, 1-naphtho- [1,2-b ] -benzothienyl, 2-naphtho- [1,2-b ] -benzothienyl, 3-naphtho- [1,2-b ] -benzothienyl, 4-naphtho- [1,2-b ] -benzothienyl, a, 5-naphtho- [1,2-b ] -benzothienyl, 6-naphtho- [1,2-b ] -benzothienyl, 7-naphtho- [1,2-b ] -benzothienyl, 8-naphtho- [1,2-b ] -benzothienyl, 9-naphtho- [1,2-b ] -benzothienyl, 10-naphtho- [1,2-b ] -benzothienyl, 1-naphtho- [2,3-b ] -benzothienyl, 2-naphtho- [2,3-b ] -benzothienyl, 3-naphtho- [2,3-b ] -benzothienyl, 4-naphtho- [2,3-b ] -benzothienyl, a, 5-naphtho- [2,3-b ] -benzothienyl, 1-naphtho- [2,1-b ] -benzothienyl, 2-naphtho- [2,1-b ] -benzothienyl, 3-naphtho- [2,1-b ] -benzothienyl, 4-naphtho- [2,1-b ] -benzothienyl, 5-naphtho- [2,1-b ] -benzothienyl, 6-naphtho- [2,1-b ] -benzothienyl, 7-naphtho- [2,1-b ] -benzothienyl, 8-naphtho- [2,1-b ] -benzothienyl, 9-naphtho- [2,1-b ] -benzothienyl, a, 10-naphtho- [2,1-b ] -benzothienyl, 2-benzofuro [3,2-d ] pyrimidinyl, 6-benzofuro [3,2-d ] pyrimidinyl, 7-benzofuro [3,2-d ] pyrimidinyl, 8-benzofuro [3,2-d ] pyrimidinyl, 9-benzofuro [3,2-d ] pyrimidinyl, 2-benzothieno [3,2-d ] pyrimidinyl, 6-benzothieno [3,2-d ] pyrimidinyl, 7-benzothieno [3,2-d ] pyrimidinyl, 8-benzothieno [3,2-d ] pyrimidinyl, 9-benzothieno [3,2-d ] pyrimidinyl, 2-benzofuro [3,2-d ] pyrazinyl, 6-benzofuro [3,2-d ] pyrazinyl, 7-benzofuro [3,2-d ] pyrazinyl, 8-benzofuro [3,2-d ] pyrazinyl, 9-benzofuro [3,2-d ] pyrazinyl, 2-benzothieno [3,2-d ] pyrazinyl, 6-benzothieno [3,2-d ] pyrazinyl, 7-benzothieno [3,2-d ] pyrazinyl, 8-benzothieno [3,2-d ] pyrazinyl, 9-benzothieno [3,2-d ] pyrazinyl, 1-silafluorenyl (silafluoenyl), 2-silafluorenyl, 3-silafluorenyl, 4-silafluorenyl, 1-germanium fluorenyl (silafluoenyl), 2-germanium fluorenyl, 3-germanium fluorenyl group, 4-germanium fluorenyl group, 1-dibenzoselenophenyl group, 2-dibenzoselenophenyl group, 3-dibenzoselenophenyl group, 4-dibenzoselenophenyl group and the like. Further, "halogen" includes F, Cl, Br and I.

Further, "ortho (o-)", "meta (m-)", and "para (p-)" are prefixes, respectively indicating the relative positions of substituents. The ortho position means that two substituents are adjacent to each other, and for example when two substituents in a benzene derivative occupy positions 1 and 2, it is referred to as ortho position. Meta indicates that the two substituents are at positions 1 and 3, and is referred to as meta, for example, when the two substituents in the benzene derivative occupy positions 1 and 3. Para represents the two substituents at positions 1 and 4, and is referred to as para, for example, when the two substituents in the benzene derivative occupy positions 1 and 4.

In this document, "substituted" in the expression "substituted or unsubstituted" means that a hydrogen atom in a certain functional group is replaced with another atom or another functional group (i.e., substituent), and with a group in which two or more substituents are connected among the substituents. For example, "a substituent in which two or more substituents are attached" may be a pyridine-triazine. That is, the pyridine-triazine may be a heteroaryl group or may be interpreted as a substituent in which two heteroaryl groups are linked. In the formulae of the present disclosure, the substituents of substituted alkyl, substituted cycloalkyl, substituted heterocycloalkyl, substituted aryl, substituted arylene, substituted heteroaryl, substituted heteroarylene, substituted silyl, and substituted amino are each independently at least one selected from the group consisting of: deuterium; halogen; a cyano group; a carboxyl group; a nitro group; a hydroxyl group; a phosphine oxide; (C1-C30) alkyl; halo (C1-C30) alkyl; (C2-C30) alkenyl; (C2-C30) alkynyl; (C1-C30) alkoxy; (C1-C30) alkylthio; (C3-C30) cycloalkyl; (C3-C30) cycloalkenyl; (3-to 7-membered) heterocycloalkyl; (C6-C30) aryloxy; (C6-C30) arylthio; (3-to 30-membered) heteroaryl unsubstituted or substituted with one or more (C6-C30) aryl; (C6-C30) aryl unsubstituted or substituted with at least one of one or more (C1-C30) alkyl groups and one or more (3-to 30-membered) heteroaryl groups; a tri (C1-C30) alkylsilyl group; a tri (C6-C30) arylsilyl group; di (C1-C30) alkyl (C6-C30) arylsilyl; (C1-C30) alkyldi (C6-C30) arylsilyl; an amino group; mono-or di- (C1-C30) alkylamino; mono-or di- (C2-C30) alkenylamino; mono-or di- (C6-C30) arylamino; mono-or di- (3-to 30-membered) heteroarylamino; (C1-C30) alkyl (C2-C30) alkenylamino; (C1-C30) alkyl (C6-C30) arylamino; (C1-C30) alkyl (3-to 30-membered) heteroarylamino; (C2-C30) alkenyl (C6-C30) arylamino; (C2-C30) alkenyl (3-to 30-membered) heteroarylamino; (C6-C30) aryl (3-to 30-membered) heteroarylamino; (C1-C30) alkylcarbonyl; (C1-C30) alkoxycarbonyl; (C6-C30) arylcarbonyl; (C6-C30) arylphosphine; bis (C6-C30) arylboronyl; di (C1-C30) alkylborono carbonyl; (C1-C30) alkyl (C6-C30) arylboronyl; (C6-C30) aryl (C1-C30) alkyl; and (C1-C30) alkyl (C6-C30) aryl. According to one embodiment of the present disclosure, each substituent is independently at least one selected from the group consisting of: (C1-C6) alkyl, (C6-C20) aryl, (5-to 15-membered) heteroaryl unsubstituted or substituted with one or more (C6-C15) aryl, di (C6-C12) arylamino, and (C1-C6) alkyl (C6-C15) aryl. Specifically, each substituent may be independently at least one selected from the group consisting of: methyl, phenyl, naphthyl, biphenyl, phenanthryl, benzophenanthryl, dimethylfluorenyl, dibenzofuranyl, dibenzothienyl, diphenyltriazinyl, phenylnaphthyltriazinyl, phenylcarbazolyl, and diphenylamino.

In formula 1, ring a is selected from the following formulae.

According to another embodiment of the disclosure, ring a is selected from the following formulae.

According to yet another embodiment of the disclosure, ring a is selected from the following formulae.

According to yet another embodiment of the disclosure, ring a is selected from the following formulae.

In formula 1, X represents NR₁₁、CR₁₂R₁₃O or S.

In this context, R₁₁Represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstitutedUnsubstituted silyl groups, or substituted or unsubstituted amino groups. According to one embodiment of the present disclosure, R₁₁Represents a substituted or unsubstituted (C6-C15) aryl group, or a substituted or unsubstituted (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms. According to another embodiment of the disclosure, R₁₁Represents a (C6-C15) aryl group substituted by at least one of one or more (5-to 15-membered) heteroaryl groups containing one or more nitrogen atoms and one or more di (C6-C15) arylamino groups; or a (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms substituted with at least one of one or more (C6-C20) aryl groups and one or more (5-to 15-membered) heteroaryl groups. According to another embodiment of the disclosure, R₁₁To R₁₃Each of the substituted or unsubstituted (3-to 30-membered) heteroaryl groups of (a) independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinolyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted dibenzoquinolyl group, a substituted or unsubstituted dibenzoquinazolinyl group, a substituted or unsubstituted dibenzoquinoxalinyl group, a substituted or unsubstituted indenopyridyl group, a substituted or unsubstituted indenopyrimidinyl group, a substituted or unsubstituted indenopyrazinyl group, a substituted or unsubstituted benzofuropyridinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, A substituted or unsubstituted benzofuropyrazinyl, a substituted or unsubstituted benzothienopyridinyl, a substituted or unsubstituted benzothienopyrimidinyl, a substituted or unsubstituted benzothienopyrazinyl, a substituted or unsubstituted carbazolyl, a substituted or unsubstituted dibenzofuranyl, or a substituted or unsubstituted dibenzothiophenyl. Specifically, R₁₁May represent a phenyl group substituted by a diphenyltriazinyl group or a diphenylamino group; naphthyl substituted with diphenyltriazinyl or phenylnaphthyltriazinyl; triazinyl, quinazolinyl, quinoxalinyl, or benzoquinoxalinyl substituted with one or more phenyl groups, one or more naphthyl groups,At least one substitution of one or more biphenyl groups, one or more phenanthryl groups, one or more benzophenanthryl groups, one or more dibenzofuranyl groups, one or more dibenzothiophenyl groups, and one or more phenylcarbazolyl groups; and the like.

Furthermore, R₁₂And R₁₃Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino; or are connected to each other to form a ring. According to one embodiment of the present disclosure, R₁₂And R₁₃Each independently represents a methyl group, an ethyl group, or a propyl group.

In formula 1, R₂₁Is represented by-L₁-Ar₁. If R is₂₁Is plural, then each R₂₁May be the same or different.

In this context, L₁Each independently represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene. According to one embodiment of the present disclosure, L₁Each independently represents a single bond, a substituted or unsubstituted (C6-C15) arylene, or a substituted or unsubstituted (5-to 15-membered) heteroarylene. According to another embodiment of the present disclosure, L₁Each independently represents a single bond, a (C6-C15) arylene group that is unsubstituted or substituted with one or more (C6-C15) aryl groups, or an unsubstituted (5-to 15-membered) heteroarylene group. According to yet another embodiment of the disclosure, L₁Each independently represents a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted terphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted phenanthrylene group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted pyridinylene group. In particular, L₁May each independently represent a single bond, phenylene, naphthylene, biphenylene, phenylene substituted with phenyl, pyridylene, or the like.

Further, Ar₁Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (3-to 7-membered) heterocycloalkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted silyl, or substituted or unsubstituted amino. According to one embodiment of the present disclosure, Ar₁Each independently represents hydrogen, a substituted or unsubstituted (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms, or a substituted or unsubstituted amino group. According to another embodiment of the disclosure, Ar₁Each independently represents hydrogen; (5-to 15-membered) heteroaryl substituted with at least one of one or more (C6-C15) aryl, one or more (5-to 15-membered) heteroaryl, and one or more (C1-C6) alkyl (C6-C15) aryl; or amino substituted with at least one of one or more (C6-C15) aryl groups, one or more (5-to 15-membered) heteroaryl groups, and one or more (C1-C6) alkyl (C6-C15) aryl groups. According to yet another embodiment of the disclosure, Ar₁Each of the substituted or unsubstituted (3-to 30-membered) heteroaryl groups of (a) independently represents a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrimidyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinolyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted dibenzoquinolyl group, a substituted or unsubstituted dibenzoquinazolinyl group, a substituted or unsubstituted dibenzoquinoxalinyl group, a substituted or unsubstituted indenopyridyl group, a substituted or unsubstituted indenopyrimidinyl group, a substituted or unsubstituted indenopyrazinyl group, a substituted or unsubstituted benzofuropyridinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, Substituted or unsubstituted benzofuropyrazinyl, substituted or unsubstituted benzothienopyridyl, substituted or unsubstituted benzothienopyrimidinyl, substituted or unsubstituted benzothienopyrazinyl, substituted or unsubstituted carbazolyl, substituted or unsubstitutedSubstituted dibenzofuranyl, or substituted or unsubstituted dibenzothiophenyl. Specifically, Ar₁May each independently represent hydrogen; triazinyl, quinazolinyl, quinoxalinyl, or benzoquinoxalinyl substituted with at least one of one or more phenyl groups, one or more naphthyl groups, one or more biphenyl groups, one or more phenanthryl groups, one or more dimethylfluorenyl groups, one or more dibenzofuranyl groups, and one or more dibenzothiophenyl groups; an amino group substituted with at least one of one or more phenyl groups, one or more naphthyl groups, one or more biphenyl groups, one or more dimethylfluorenyl groups, one or more dibenzofuranyl groups, one or more dibenzothiophenyl groups, one or more phenylcarbazolyl groups, and the like.

In formula 1, a represents an integer of 1 to 4, b represents an integer of 1 to 10, wherein if a and b are integers of 2 or more, each R₁And each R₂₁May be the same or different.

According to one embodiment of the present disclosure, R₁₁Represents a substituted or unsubstituted (C6-C15) aryl group, or a substituted or unsubstituted (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms; l is₁Each independently represents a single bond, a substituted or unsubstituted (C6-C15) arylene, or a substituted or unsubstituted (5-to 15-membered) heteroarylene; and Ar₁Each independently represents hydrogen, a substituted or unsubstituted (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms, or a substituted or unsubstituted amino group.

According to another embodiment of the disclosure, R₁₁Represents a (C6-C15) aryl group unsubstituted or substituted by at least one of one or more (5-to 15-membered) heteroaryl groups containing one or more nitrogen atoms and one or more di (C6-C15) arylamino groups; or a (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms substituted with at least one of one or more (C6-C20) aryl groups and one or more (5-to 15-membered) heteroaryl groups; l is₁Each independently represents a single bond, a (C6-C15) arylene group unsubstituted or substituted with one or more (C6-C15) aryl groups, or an unsubstituted (5-to 15-membered) heteroarylene group; ar (Ar)₁Each independentlyRepresents hydrogen; (5-to 15-membered) heteroaryl substituted with at least one of one or more (C6-C15) aryl, one or more (5-to 15-membered) heteroaryl, and one or more (C1-C6) alkyl (C6-C15) aryl; or amino substituted with at least one of one or more (C6-C15) aryl groups, one or more (5-to 15-membered) heteroaryl groups, and one or more (C1-C6) alkyl (C6-C15) aryl groups.

In the formulae of the present disclosure, if a substituent is linked to an adjacent substituent or two adjacent substituents are linked to each other to form a ring, the ring may be a substituted or unsubstituted monocyclic or polycyclic (3-to 30-membered) aliphatic or aromatic ring, or a combination thereof. Furthermore, the ring formed may contain at least one heteroatom selected from B, N, O, S, Si and P, preferably at least one heteroatom selected from N, O and S. According to one embodiment of the disclosure, the number of ring backbone atoms is 5 to 20. According to another embodiment of the disclosure, the number of ring backbone atoms is 5 to 15. For example, the fused ring may be a substituted or unsubstituted dibenzothiophene ring, a substituted or unsubstituted dibenzofuran ring, a substituted or unsubstituted naphthalene ring, a substituted or unsubstituted phenanthrene ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted benzothiophene ring, a substituted or unsubstituted benzofuran ring, a substituted or unsubstituted indole ring, a substituted or unsubstituted indene ring, a substituted or unsubstituted benzene ring, or a substituted or unsubstituted carbazole ring.

In the formulae of the present disclosure, the heterocycloalkyl and heteroaryl (ene) groups may each independently contain at least one heteroatom selected from B, N, O, S, Si and P. Further, the heteroatom may be bonded to at least one substituent selected from the group consisting of: hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (5-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri (C1-C30) alkylsilyl, substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi (C6-C30) arylsilyl, substituted or unsubstituted tri (C6-C30) arylsilyl, substituted or unsubstituted mono-or di- (C1-C30) alkylamino, substituted or unsubstituted mono-or di- (C6-C30) arylamino, And substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino.

The compound represented by formula 1 may be one selected from the following compounds, but is not limited thereto.

The compounds represented by formula 1 of the present disclosure can be produced by synthetic methods known to those skilled in the art, and, for example, according to the following reaction schemes 1 to 7.

[ reaction scheme 1]

[ reaction scheme 2]

[ reaction scheme 3]

[ reaction scheme 4]

[ reaction scheme 5]

[ reaction scheme 6]

[ reaction scheme 7]

In reaction schemes 1 to 7, X, R₁、L₁、Ar₁And a is as defined in formula 1, and Hal represents halogen.

Although illustrative synthetic examples of the compound represented by formula 1 are described above, those skilled in the art will readily understand that they are all based on Suzuki (Suzuki) cross-coupling reaction, Wittig (Wittig) reaction, Miyaura (Miyaura) boration reaction, Ullmann (Ullmann) reaction, Buchwald-Harttig (Buchwald-Hartwig) cross-coupling reaction, N-arylation reaction, montmorillonite acidification-mediated (H-mont-mediated) etherification reaction, intramolecular acid-induced cyclization reaction, Pd (II) -catalyzed oxidative cyclization reaction, Grignard (Grignard) reaction, Heck (Heck) reaction, dehydration cyclization reaction, SN (N-type amine)₁Substitution reaction, SN₂Substitution reaction, phosphine-mediated reductive cyclization reaction, and the like, and the above reaction proceeds even if a substituent defined in the above formula 1 but not specified in the specific synthetic example is bonded.

The hole transport region of the present disclosure may be comprised of one or more layers selected from the group consisting of a hole transport layer, a hole injection layer, an electron blocking layer, and a hole assist layer. Each layer may consist of one or more layers.

According to one embodiment of the present disclosure, the hole transport region may include a hole transport layer. In addition, the hole transport region may include a hole transport layer, and further include one or more of a hole injection layer, an electron blocking layer, and a hole assist layer.

The present disclosure provides an organic electroluminescent material including a compound represented by formula 1, and an organic electroluminescent device including the organic electroluminescent material.

The organic electroluminescent material may consist of only the compound according to the present disclosure, or may further include conventional materials included in the organic electroluminescent material.

The organic electroluminescent compound of formula 1 of the present disclosure may be contained in one or more layers of a light emitting layer, a hole injection layer, a hole transport layer, a hole auxiliary layer, a light emitting auxiliary layer, an electron transport layer, an electron buffer layer, an electron injection layer, an intermediate layer, a hole blocking layer, and an electron blocking layer; preferably in the light-emitting layer. When used in a light emitting layer, the organic electroluminescent compound having formula 1 of the present disclosure may be included as a host material. Preferably, the light emitting layer may further comprise one or more dopants. The organic electroluminescent compounds of the present disclosure can be used as a co-host material, if desired. That is, the light emitting layer may further include an organic electroluminescent compound other than the organic electroluminescent compound represented by formula 1 of the present disclosure (first host material) as a second host material. In this case, the weight ratio between the first host material and the second host material is 1:99 to 99: 1. When two or more materials are included in one layer, mixed deposition may be performed to form the layer, or co-deposition may be separately performed at the same time to form the layer.

According to one embodiment of the present disclosure, when the organic electroluminescent compound having formula 1 of the present disclosure is included in a light emitting layer, the light emitting layer may further include a compound represented by formula 2 below:

wherein

X₁And Y₁Each independently represents-N ═ NR₇-, -O-, or-S-, with the proviso that X₁And Y₁Any one of represents-N ═ and X₁And Y₁Another of (a) represents-NR₇-, -O-, or-S-;

r' represents a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3-to 30-membered) heteroaryl group;

R₂to R₇Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri (C1-C30) alkylsilyl, substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyl di (C6-C30) arylsilyl, substituted or unsubstituted tri (C6-C30) arylsilyl, substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, substituted or unsubstituted mono-or di (C30) alkyl (C1-C30) amino, Substituted or unsubstituted mono-or di- (C2-C30) alkenylamino, substituted or unsubstituted (C1-C30) alkyl (C2-C30) alkenylamino, substituted or unsubstituted mono-or di- (C6-C30) arylamino, substituted or unsubstituted (C1-C30) alkyl (C6-C30) arylamino, substituted or unsubstituted mono-or di- (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C1-C30) alkyl (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C2-C30) alkenyl (C6-C30) arylamino, substituted or unsubstituted (C2-C30) alkenyl (3-to 30-membered) heteroarylamino, or substituted or unsubstituted (C6-C30) aryl (3-to 30-membered) heteroarylamino; or may be linked to an adjacent substituent to form one or more rings;

l' represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene; and is

f represents 1, g and h each independently represent 1 or 2, i represents an integer of 1 to 4, wherein if each of g to i is an integer of 2 or more, each R is₂To each R₄May be the same or different.

In formula 2, X₁And Y₁Each independently represents-N ═ NR₇-, -O-, or-S-, with the proviso that X₁And Y₁Any one of represents-N ═ and X₁And Y₁Another of (a) represents-NR₇-, -O-, or-S-. According to one embodiment, X₁And Y₁Any one of which represents-N-and the other represents-O-or-S-. For example, X₁represents-N ═ and Y₁represents-O-; x₁represents-O-and Y₁represents-N ═ N; or X₁represents-S-and Y₁represents-N ═ N. In formula 2, R' represents a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3-to 30-membered) heteroaryl group. According to one embodiment, R' represents a substituted or unsubstituted (C6-C30) aryl, or a substituted or unsubstituted (5-to 25-membered) heteroaryl. According to another embodiment, R' represents a substituted or unsubstituted (C6-C30) aryl, or a substituted or unsubstituted (5-to 20-membered) heteroaryl. For example, R' represents unsubstituted phenyl, unsubstituted biphenyl, unsubstituted naphthyl, fluorenyl substituted with one or more methyl groups, benzofluorenyl substituted with one or more methyl groups, unsubstituted dibenzofuranyl, unsubstituted dibenzothienyl, spiro [ fluorene-fluorene [ ] -fluorene [ -fluorene ] ] -fluorene [ -dibenzofuran [ -fluorene [ -dibenzofuran [ -is [ -dibenzofuran [ -in]Spiro [ fluorene-benzofluorene ] s]A group, or an unsubstituted pyridyl group.

In formula 2, R₂To R₇Each independently represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri (C1-C30) alkylsilyl, substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyl di (C6-C30) arylsilyl, substituted or unsubstituted tri (C6-C30) arylsilyl, substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, substituted or unsubstituted mono-or di (C30) alkyl (C1-C30) amino, Substituted or unsubstituted mono-or di- (C2-C30) alkenylamino, substituted or unsubstituted (C1-C30) alkyl (C2-C30) alkenylamino, substituted or unsubstituted mono-or di- (C6-C30) arylamino, substituted or unsubstituted(C1-C30) alkyl (C6-C30) arylamino, substituted or unsubstituted mono-or di- (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C1-C30) alkyl (3-to 30-membered) heteroarylamino, substituted or unsubstituted (C2-C30) alkenyl (C6-C30) arylamino, substituted or unsubstituted (C2-C30) alkenyl (3-to 30-membered) heteroarylamino, or substituted or unsubstituted (C6-C30) aryl (3-to 30-membered) heteroarylamino; or may be linked to an adjacent substituent to form one or more rings. According to one embodiment, R₂To R₇Each independently represents hydrogen, a substituted or unsubstituted (C6-C25) aryl, a substituted or unsubstituted (3-to 25-membered) heteroaryl, or a substituted or unsubstituted mono-or di- (C6-C25) arylamino; or may be linked to an adjacent substituent(s) to form one or more substituted or unsubstituted, mono-or polycyclic, (C3-C30) alicyclic or aromatic rings in which one or more carbon atoms may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur. According to another embodiment, R₂To R₇Each independently represents hydrogen, substituted or unsubstituted (C6-C25) aryl, substituted or unsubstituted (5-to 25-membered) heteroaryl, substituted or unsubstituted di (C6-C18) arylamino, substituted or unsubstituted mono-or di- (3-to 30-membered) heteroarylamino, or substituted or unsubstituted (C6-C30) aryl (3-to 30-membered) heteroarylamino; or may be linked to an adjacent substituent to form one or more substituted or unsubstituted, mono-or polycyclic, (C3-C25) alicyclic or aromatic rings, one or more carbon atoms of which may be replaced with at least one heteroatom selected from nitrogen and sulfur, and the heteroaryl group may contain at least one heteroatom selected from the group consisting of B, N, O, S, Si and P. In particular, R', R₅And R₆Each independently represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted benzofluorenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted spirobifluorenyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted pyrimidine groupA group, a substituted or unsubstituted quinolyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted benzoquinazolinyl group, a substituted or unsubstituted benzoquinoxalinyl group, a substituted or unsubstituted benzofuropyrimidinyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzothienyl group, a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted naphthyridinyl group, a substituted or unsubstituted benzonaphthofuranyl group, or a substituted or unsubstituted benzonaphthothienyl group. For example, R₅And R₆Each independently represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted o-biphenyl group, a substituted or unsubstituted m-biphenyl group, a substituted or unsubstituted p-biphenylyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a substituted or unsubstituted benzofluorenyl group. For example, R' may be phenyl, biphenyl, or pyridyl; r₂And R₃May be hydrogen; r₄May be hydrogen or phenyl; r₅And R₆Each independently may be a substituted phenyl, naphthyl, biphenyl, phenanthryl, dimethylfluorenyl, diphenylfluorenyl, naphthylphenyl, phenylnaphthyl, dimethylbenzfluorenyl, terphenyl, spirobifluorenyl, benzofuranyl, benzothienyl, dibenzothienyl, dibenzofuranyl unsubstituted or substituted with one or more phenyl groups, carbazolyl substituted with one or more phenyl groups, or benzonaphthofuranyl group; and one or more substituents of the substituted phenyl group may be at least one selected from the group consisting of: phenyl substituted with at least one of deuterium, one or more methyl groups, and one or more tert-butyl groups; an anthracene group; a fluoranthenyl group; a phenyl fluorenyl group; a cyclohexyl group; pyridyl substituted with one or more phenyl groups; a phenoxazinyl group; and benzimidazolyl substituted with one or more phenyl groups.

In formula 2, f represents 1 or 2, preferably 1; g and h each independently represent 1 or 2, preferably 1; i represents an integer of 1 to 4,preferably 1 or 2. If each of g to i is an integer of 2 or more, then each R₂To each R₄May be the same or different.

In formula 2, L' represents a single bond, a substituted or unsubstituted (C6-C30) arylene group, or a substituted or unsubstituted (3-to 30-membered) heteroarylene group. According to one embodiment of the present disclosure, L' represents a single bond, or a substituted or unsubstituted (C6-C18) arylene group. According to another embodiment of the disclosure, L' represents a single bond, or an unsubstituted (C6-C12) arylene group. For example, L' represents a single bond, or an unsubstituted phenylene group.

The compound represented by formula 2 may be one selected from the following compounds, but is not limited thereto.

According to another embodiment of the present disclosure, when the organic electroluminescent compound having formula 1 of the present disclosure is included in a light emitting layer, the light emitting layer may further include a compound represented by formula 3 below:

HAr-((L₂)e-Ar₂)d-----(3)

wherein

HAr represents a substituted or unsubstituted (3-to 20-membered) heteroaryl group containing one or more nitrogen atoms;

L₂each independently represents a substituted or unsubstituted (C6-C30) arylene group;

Ar₂each independently represents a substituted or unsubstituted (C6-C30) aryl group, or formula 4 below, with the proviso that Ar₂At least one of them is represented by formula 4;

y represents O, S, CR₄₁R₄₂N-, or NR₄₃；

R₄₁To R₄₃Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, or a substituted or unsubstituted (C6-C30) aryl group, or R₄₁And R₄₂May be linked to each other to form a ring;

R₃₁to R₃₈Each independently of the other represents₂The site of ligation; or represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C30) cycloalkyl, a substituted or unsubstituted (C1-C30) alkoxy group, a substituted or unsubstituted tri (C1-C30) alkylsilyl group, a substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl group, a substituted or unsubstituted (C1-C30) alkyldi (C6-C30) arylsilyl group, a substituted or unsubstituted tri (C6-C30) arylsilyl group, a substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, or-L.₄-N(Ar₃)(Ar₄) (ii) a Or may be linked to an adjacent substituent to form one or more rings;

L₄each independently represents a single bond, a substituted or unsubstituted (C6-C30) arylene group, or a substituted or unsubstituted (3-to 30-membered) heteroarylene groupA group;

Ar₃and Ar₄Each independently represents hydrogen, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C2-C30) alkenyl, a fused ring group of substituted or unsubstituted one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, substituted or unsubstituted (C6-C30) aryl, or substituted or unsubstituted (3-to 30-membered) heteroaryl;

d represents an integer of 1 to 3, wherein if d is an integer of 2 or more, each ((L)₂)_e-Ar₂) May be the same or different;

e represents an integer of 0 to 2, wherein if e is 2, then each L₂May be the same or different; and is

Is represented by₂The site of ligation.

In formula 3, HAr represents a substituted or unsubstituted (3-to 20-membered) heteroaryl group containing one or more nitrogen atoms. According to one embodiment of the disclosure, HAr represents a substituted or unsubstituted (3-to 15-membered) heteroaryl group containing one or more nitrogen atoms. According to another embodiment of the disclosure, HAr represents an unsubstituted (5-to 15-membered) heteroaryl group containing one or more nitrogen atoms. Specifically, HAr may be pyridyl, pyrimidinyl, triazinyl, quinolyl, quinazolinyl, quinoxalinyl, naphthyridinyl, pyridopyrazinyl, benzoquinazolinyl, benzoquinoxalinyl, benzofuropyrimidinyl, and the like.

In formula 3, L₂Each independently represents a substituted or unsubstituted (C6-C30) arylene group. According to one embodiment of the present disclosure, L₂Each independently represents a substituted or unsubstituted (C6-C20) arylene group. According to another embodiment, L₂Each independently represents an unsubstituted (C6-C20) arylene group. In particular, L₂Each independently may be phenylene, naphthylene, biphenylene, benzophenanthrene, and the like.

In formula 3, Ar₂Each independently represents a substituted or unsubstituted (C6-C30) aryl group, or formula 4, with the proviso that Ar₂At least one of them is represented by formula 4. According to one embodiment of the present disclosure, Ar₂Each independently represent(C6-C30) aryl substituted with a (5-to 15-membered) heteroaryl substituted with one or more (C6-C12) aryl; (C6-C30) aryl substituted with one or more di (C6-C12) arylamino groups; unsubstituted (C6-C30) aryl; or formula 4. Specifically, Ar₂Each independently may be phenyl, naphthyl, phenylnaphthyl, naphthylphenyl, biphenyl, terphenyl, phenanthryl, triphenylene, or,Phenyl unsubstituted or substituted with one or more phenyl, phenyl substituted with one or more phenylquinoxalinyl, phenyl substituted with one or more diphenylamino, and the like, or formula 4.

In formula 4, Y represents O, S, CR₄₁R₄₂N-, or NR₄₃(ii) a And represents and L₂The site of ligation.

In formula 4, R₄₁To R₄₃Each independently represents a substituted or unsubstituted (C1-C30) alkyl group, or a substituted or unsubstituted (C6-C30) aryl group, or R₄₁And R₄₂May be connected to each other to form a ring. According to one embodiment of the present disclosure, R₄₁To R₄₃Each independently represents a substituted or unsubstituted (C1-C6) alkyl group, or a substituted or unsubstituted (C6-C12) aryl group, or R₄₁And R₄₂May be connected to each other to form a ring. According to another embodiment of the disclosure, R₄₁To R₄₃Each independently represents an unsubstituted (C1-C6) alkyl group, or an unsubstituted (C6-C12) aryl group, or R₄₁And R₄₂May be connected to each other to form a ring. Specifically, R₄₁To R₄₃May each independently represent methyl, phenyl, etc., or R₄₁And R₄₂May be linked to each other to form a fluorene ring.

In formula 4, R₃₁To R₃₈Each independently of the other represents₂The site of ligation; or represents hydrogen, deuterium, halogen, cyano, substituted or unsubstituted (C1-C30) alkyl, substituted or unsubstituted (C6-C30) aryl, substituted or unsubstituted (3-to 30-membered) heteroaryl, substituted or unsubstituted (C3-C3)0) Cycloalkyl, substituted or unsubstituted (C1-C30) alkoxy, substituted or unsubstituted tri (C1-C30) alkylsilyl, substituted or unsubstituted di (C1-C30) alkyl (C6-C30) arylsilyl, substituted or unsubstituted (C1-C30) alkyldi (C6-C30) arylsilyl, substituted or unsubstituted tri (C6-C30) arylsilyl, substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, or-L6-C30₄-N(Ar₃)(Ar₄) (ii) a Or may be linked to an adjacent substituent to form one or more rings. According to one embodiment of the present disclosure, R₃₁To R₃₈Each independently of the other represents₂The site of ligation; or represents hydrogen, or a substituted or unsubstituted (C6-C20) aryl group; or may be linked to an adjacent substituent to form one or more rings. According to another embodiment of the disclosure, R₃₁To R₃₈Each independently of the other represents₂The site of ligation; or represents hydrogen, or an unsubstituted (C6-C18) aryl group; or may be linked to an adjacent substituent to form one or more rings. For example, R₃₁To R₃₈Each independently may be with L₂The site of ligation; or may be hydrogen, phenyl, naphthyl, biphenyl, naphthylphenyl, phenylnaphthyl, and the like; or may be linked to an adjacent substituent to form a benzene ring.

L₄Represents a single bond, a substituted or unsubstituted (C6-C30) arylene, or a substituted or unsubstituted (3-to 30-membered) heteroarylene.

Ar₃And Ar₄Each independently represents hydrogen, a substituted or unsubstituted (C1-C30) alkyl group, a substituted or unsubstituted (C2-C30) alkenyl group, a substituted or unsubstituted fused ring group of one or more (C3-C30) aliphatic rings and one or more (C6-C30) aromatic rings, a substituted or unsubstituted (C6-C30) aryl group, or a substituted or unsubstituted (3-to 30-membered) heteroaryl group.

In formula 3, d represents an integer of 1 to 3, wherein if d is an integer of 2 or more, each ((L)₂)_e-Ar₂) May be the same or different. For example, d may be an integer of 2 or 3, and each ((L)₂)_e-Ar₂) May be the same orDifferent.

In formula 3, e represents an integer of 0 to 2, wherein if e is 2, each L₂May be the same or different.

The compound represented by formula 3 may be one selected from the following compounds, but is not limited thereto.

The dopant included in the organic electroluminescent device of the present disclosure may be at least one phosphorescent dopant or fluorescent dopant, and is preferably a phosphorescent dopant. The phosphorescent dopant material applied to the organic electroluminescent device of the present disclosure is not particularly limited, but may be preferably selected from complex compounds of metallized iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), more preferably from complex compounds of ortho-metallized iridium (Ir), osmium (Os), copper (Cu), and platinum (Pt), and even more preferably an ortho-metallized iridium complex compound.

The dopant included in the organic electroluminescent device of the present disclosure may include a compound represented by the following formula 101, but is not limited thereto.

In formula 101, L is selected from the following structures 1 to 3.

R₁₀₀To R₁₀₃Each independently represents hydrogen, deuterium, halogen, (C1-C30) alkyl unsubstituted or substituted by deuterium and/or one or more halogensSubstituted or unsubstituted (C3-C30) cycloalkyl, substituted or unsubstituted (C6-C30) aryl, cyano, substituted or unsubstituted (3-to 30-membered) heteroaryl, or substituted or unsubstituted (C1-C30) alkoxy; or may be linked to an adjacent substituent to form one or more rings with the pyridine, e.g., substituted or unsubstituted quinoline, isoquinoline, benzofuropyridine, benzothienopyridine, indenopyridine, benzofuroquinoline, benzothienoquinoline, or indenoquinoline;

R₁₀₄to R₁₀₇Each independently represents hydrogen, deuterium, halogen, a (C1-C30) alkyl group that is unsubstituted or substituted with deuterium and/or one or more halogens, a substituted or unsubstituted (C3-C30) cycloalkyl group, a substituted or unsubstituted (C6-C30) aryl group, a substituted or unsubstituted (3-to 30-membered) heteroaryl group, cyano, or a substituted or unsubstituted (C1-C30) alkoxy group; or may be linked to an adjacent substituent to form one or more rings with benzene, for example substituted or unsubstituted naphthalene, fluorene, dibenzothiophene, dibenzofuran, indenopyridine, benzofuropyridine, or benzothienopyridine;

R₂₀₁to R₂₂₀Each independently represents hydrogen, deuterium, halogen, a (C1-C30) alkyl group that is unsubstituted or substituted with deuterium and/or one or more halogens, a substituted or unsubstituted (C3-C30) cycloalkyl group, or a substituted or unsubstituted (C6-C30) aryl group; or may be linked to an adjacent substituent to form one or more rings; and is

s represents an integer of 1 to 3.

Specific examples of the dopant compound are as follows, but are not limited thereto.

An organic electroluminescent device according to the present disclosure has a first electrode, a second electrode, and at least one organic layer between the first electrode and the second electrode.

One of the first electrode and the second electrode may be an anode, and the other may be a cathode. The organic layer includes a light emitting layer and may further include at least one layer selected from the group consisting of: a hole injection layer, a hole transport layer, a hole assist layer, a light emission assist layer, an electron transport layer, an electron buffer layer, an electron injection layer, an intermediate layer, a hole blocking layer, and an electron blocking layer. Further, each layer may be composed of multiple layers.

The first electrode and the second electrode may each be formed of a transmissive conductive material, a transflective conductive material, or a reflective conductive material. The organic electroluminescent device may be a top emission type, a bottom emission type, or a both-side emission type according to the kind of materials forming the first electrode and the second electrode. In addition, the hole injection layer may be further doped with a p-type dopant, and the electron injection layer may be further doped with an n-type dopant.

According to one embodiment of the present disclosure, the organic electroluminescent device of the present disclosure may further include an azine-based compound as at least one of an electron transport material, an electron injection material, an electron buffer material, and a hole blocking material, in addition to the organic electroluminescent compound of the present disclosure.

In the organic electroluminescent device according to the present disclosure, the organic layer may further include at least one compound selected from the group consisting of arylamine-based compounds and styrylarylamine-based compounds.

Further, in the organic electroluminescent device of the present disclosure, the organic layer may further include at least one metal selected from the group consisting of: an organometallic of a metal of group 1, a metal of group 2, a transition metal of period 4, a transition metal of period 5, a lanthanide and a d-transition element of the periodic table, or at least one complex compound comprising said metals.

The organic electroluminescent device of the present disclosure may emit white light by further including at least one light emitting layer containing a compound emitting blue, red or green light known in the art, in addition to the compound of the present disclosure. In addition, it may further include a layer emitting yellow or orange light, if necessary.

In the organic electroluminescent device of the present disclosure, at least one layer (hereinafter, "surface layer") selected from a chalcogenide layer, a metal halide layer, and a metal oxide layer may be preferably disposed on one or more inner surfaces of one or both electrodes. Specifically, a chalcogenide (including oxide) layer of silicon or aluminum is preferably disposed on the anode surface of the electroluminescent medium layer, and a metal halide layer or a metal oxide layer is preferably disposed on the cathode surface of the electroluminescent medium layer. The surface layer may provide operational stability to the organic electroluminescent device. Preferably, the chalcogenide comprises SiO_X(1≤X≤2)、AlO_X(X is more than or equal to 1 and less than or equal to 1.5), SiON, SiAlON and the like; the metal halide includes LiF, MgF₂、CaF₂Rare earth metal fluorides, etc.; and the metal oxide comprises Cs₂O、Li₂O, MgO, SrO, BaO, CaO, etc.

A hole injection layer, a hole transport layer, or an electron blocking layer, or a combination thereof, may be used between the anode and the light emitting layer. The hole injection layer may be a multilayer in order to lower a hole injection barrier (or hole injection voltage) from the anode to the hole transport layer or the electron blocking layer, wherein each of the multilayer may use two compounds at the same time. The hole transport layer or the electron blocking layer may also be a multilayer.

An electron buffer layer, a hole blocking layer, an electron transport layer, or an electron injection layer, or a combination thereof, may be used between the light emitting layer and the cathode. The electron buffer layer may be a multi-layer to control injection of electrons and improve interface characteristics between the light emitting layer and the electron injection layer, wherein each of the multi-layers may use two compounds at the same time. The hole blocking layer or the electron transporting layer may also be a multilayer, wherein each of the multiple layers may use multiple compounds.

The light emission assisting layer may be disposed between the anode and the light emitting layer, or between the cathode and the light emitting layer. When a light-emitting auxiliary layer is placed between the anode and the light-emitting layer, it can be used to facilitate hole injection and/or hole transport, or to prevent electron overflow. When the light-emitting auxiliary layer is placed between the cathode and the light-emitting layer, it may be used to facilitate electron injection and/or electron transport, or to prevent hole overflow. In addition, a hole assist layer may be disposed between the hole transport layer (or hole injection layer) and the light emitting layer, and the hole transport rate (or hole injection rate) may be effectively promoted or limited, thereby enabling control of charge balance. In addition, an electron blocking layer may be disposed between the hole transport layer (or the hole injection layer) and the light emitting layer, and may block overflow electrons from the light emitting layer and confine excitons in the light emitting layer to prevent light leakage. When the organic electroluminescent device includes two or more hole transport layers, the hole transport layers further included may serve as a hole assist layer or an electron blocking layer. The hole assist layer and the electron blocking layer may have an effect of improving the efficiency and/or lifetime of the organic electroluminescent device.

In the organic electroluminescent device of the present disclosure, it is preferable that a mixed region of the electron transport compound and the reductive dopant or a mixed region of the hole transport compound and the oxidative dopant is disposed on at least one surface of the pair of electrodes. In this case, the electron transport compound is reduced to an anion, and thus it becomes easier to inject and transport electrons from the mixed region to the electroluminescent medium. In addition, the hole-transporting compound is oxidized into cations, and thus it becomes easier to inject and transport holes from the mixed region to the electroluminescent medium. Preferably, the oxidizing dopant includes various lewis acids and acceptor compounds; and the reducing dopant includes alkali metals, alkali metal compounds, alkaline earth metals, rare earth metals, and mixtures thereof. The reductive dopant layer may be used as a charge generation layer to produce an organic electroluminescent device having two or more light emitting layers emitting white light.

According to one embodiment of the present disclosure, an organic electroluminescent material may be used as a light emitting material for a white organic light emitting device. According to the arrangement of R (red), G (green), B (blue), or YG (yellow-green) light emitting cells, a white organic light emitting device has been proposed to have various structures, such as a parallel arrangement (side-by-side) method, a stacking method, or a Color Conversion Material (CCM) method, etc. Further, according to one embodiment of the present disclosure, the organic electroluminescent material may also be applied to an organic electroluminescent device including Quantum Dots (QDs).

In order to form each layer of the organic electroluminescent device of the present disclosure, a dry film forming method such as vacuum evaporation, sputtering, plasma, ion plating, or the like, or a wet film forming method such as inkjet printing, spin coating, dip coating, flow coating, or the like may be used. The first and second host compounds of the present disclosure may be co-evaporated or co-evaporated to form a film.

When a wet film-forming method is used, a thin film may be formed by dissolving or dispersing the material forming each layer in any suitable solvent such as ethanol, chloroform, tetrahydrofuran, dioxane, or the like. The solvent is not particularly limited as long as the material constituting each layer is soluble or dispersible in the solvent, which does not cause any problem in forming a film.

A display system, such as a display system for a smart phone, a tablet computer, a notebook computer, a PC, a TV, or an automobile, may be produced by using the organic electroluminescent device of the present disclosure; or a lighting system, such as an outdoor or indoor lighting system.

Hereinafter, the preparation method of the compound of the present disclosure, and the characteristics of the compound will be explained in detail with reference to representative compounds of the present disclosure. However, the present disclosure is not limited to the following examples.

Example 1: preparation of Compound C-686

Synthesis of Compound 1-1

1-bromo-2-naphthaldehyde (20.0g, 85.1mmol), 3- (4,4,5, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) -9H-carbazole (26.2g, 51.5mmol), tetrakis (triphenylphosphine) palladium (0) (2.95g, 2.55mmol), NaOH (4.12g, 255mmol), 360mL Tetrahydrofuran (THF), and 90mL H₂O was introduced into the flask, and the mixture was stirred at 90 ℃ for 1.5 hours under reflux. After the reaction is completed, the reaction mixture is treated with NH₄Neutralized with aqueous Cl, extracted with dichloromethane (MC), and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 1-1(20.0g, yield: 73%).

Synthesis of Compound 1-2

Compound 1-1(19.0g, 59.1mmol), (methoxymethyl) triphenylphosphonium chloride (30.4g, 88.7mmol), and 300mL of THF were introduced into a flask, and 33.3mL of a 1M K-Ot-Bu solution in THF was added dropwise thereto while stirring at 0 ℃. The mixture was stirred for 3 hours with NH₄Neutralized with Cl, extracted with MC, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 1-2(20.0g, yield: 97%).

Synthesis of Compounds 1-3

Compound 1-2(66.3g, 191mmol), 34mL of Eton's reagent, and 950mL of chlorobenzene were introduced into a flask, and the mixture was stirred at reflux at 180 ℃ overnight. After the reaction was complete, the reaction mixture was washed with NaHCO₃Neutralizing, extracting with MC, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compounds 1 to 3(27g, yield: 45%).

Synthesis of Compound C-686

The compounds 1-3(10.0g, 11mmol), 2-chloro-3-phenyl-quinoxaline (7.6g, 31.5mmol), Cs₂CO₃(10.3g, 31.5mmol), Dimethylaminopyridine (DMAP) (1.92g, 0.0158mmol), and 60mL of Dimethylsulfoxide (DMSO) were introduced into a flask, and the mixture was stirred at 100 ℃ for 4 hours. After the reaction is complete, the reaction is carried out by reacting H₂The solid obtained by adding O to the mixture was separated by column chromatography, and the solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-686(1.3g, yield: 8%).

Compound (I)	MW	Melting Point
			C-686	521.61	269℃

Example 2: preparation of Compound C-700

The compound 1-3(5.0g, 15.8mmol), 2- (2-bromophenyl) -4, 6-diphenyl-1, 3, 5-triazine (6.71g, 17.3mmol), CuSO₄(1.0g，6.30mmol)、K₂CO₃(4.35g, 31.5mmol), and 80mL of ortho-dichlorobenzene (o-DCB) were introduced into the flask, and the mixture was stirred at reflux at 180 ℃ overnight. After completion of the reaction, solid was obtained by adding MeOH to the mixtureBody, and dissolving the solid in CHCl₃In (1). The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-700(2.0g, yield: 20%).

Compound (I)	MW	Melting Point
			C-700	624.73	236℃

Example 3: preparation of Compound C-589

Synthesis of Compound 3-1

Reacting 5-bromobenzo [ b]Naphtho [1,2-d ]]Thiophene (50.0g, 160mmol), 4,4,4',4',5,5,5',5' -octamethyl-2, 2' -bis (1,3, 2-dioxaborolan) (48.6g, 192mmol), PdCl₂(PPh₃)₂(5.60g, 7.98mmol), KOAc (39.2g, 399mmol), and 800mL of 1, 4-dioxane were introduced into the flask, and the mixture was stirred at 130 ℃ for 2 hours under reflux. After the completion of the reaction, the reaction mixture was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 3-1(41.3g, yield: 72%).

Synthesis of Compound 3-2

The compound3-1(40.3g, 112mmol), 2-bromo-5-chloro-benzaldehyde (25.8g, 117mmol), tetrakis (triphenylphosphine) palladium (0) (3.88g, 3.36mmol), NaOH (13.4g, 336mmol), 450mL THF, and 150mL H₂O was introduced into the flask and the mixture was stirred at 130 ℃ for 2 hours under reflux. After completion of the reaction, the reaction mixture was neutralized with aqueous HCl, extracted with EA, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 3-2(26.0g, yield: 62.3%).

Synthesis of Compound 3-3

Compound 3-2(25.0g, 67.0mmol), (methoxymethyl) triphenylphosphonium chloride (34.6g, 101mmol), and 340mL of THF were introduced into a flask, and 101mL of a 1M K-Ot-Bu solution in THF was added dropwise thereto while stirring at 0 ℃. The mixture was stirred for 3 hours with NH₄Neutralized with Cl, extracted with MC, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 3-3(37.0g, yield: 138%).

Synthesis of Compounds 3-4

Compound 3-3(36.0g, 89.8mmol) was dissolved in 450mL of MC in a flask, and 34mL of BF was added dropwise thereto while stirring at 0 deg.C₃EtOEt. After the reaction was complete, the reaction mixture was washed with NaHCO₃Neutralizing, extracting with MC, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 3-4(18.7g, yield: 56.5%).

Synthesis of Compound C-589

Compound 3-4(4.50g, 12.2mmol), N-phenyldibenzofuran-3-amine (3.32g, 12.8mmol), Pd₂(dba)₃(0.559g, 0.610mmol), s-phos (0.501g, 1.22mmol), NaOt-Bu (2.34g, 24.4mmol), and 60mL of toluene were introduced into the flask, and the mixture was stirred at 140 ℃ for 2 hours. After completion of the reaction, the mixture was cooled to room temperature and purified by column chromatographySeparating by a method. Then, the solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-589(2.5g, yield: 34.6%).

Compound (I)	MW	Melting Point
			C-589	591.72	122.6℃

Example 4: preparation of Compound C-101

Synthesis of Compound 4-1

The compound 3-4(9.0g, 24.4mmol), 4,4,4',4',5,5,5',5' -octamethyl-2, 2' -bis (1,3, 2-dioxaborolan) (8.05g, 31.7mmol), Pd₂(dba)₃(1.12g, 1.22mmol), s-phos (1.00g, 2.44mmol), KOAc (7.18g, 73.2mmol), and 110mL 1, 4-dioxane were introduced into the flask, and the mixture was stirred at 130 ℃ for 2 hours under reflux. After completion of the reaction, the reaction mixture was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 4-1(10.0g, yield: 89%).

Synthesis of Compound C-101

The compound 4-1(5.0g, 10.9mmol), 2- (2-bromophenyl) -4, 6-diphenyl-1, 3, 5-triazine (4.2)2g, 10.9mmol), tetrakis (triphenylphosphine) palladium (0) (0.627g, 0.543mmol), K₂CO₃(3.75g, 27.2mmol), 50.0mL toluene, 25.0mL EtOH, and 25.0mL H₂O was introduced into the flask and the mixture was stirred at 140 ℃ for 2 hours under reflux. After completion of the reaction, the reaction mixture was diluted by addition of water, extracted with EA, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-101(3.0g, yield: 43.0%).

Compound (I)	MW	Melting Point
			C-101	641.79	254.6℃

Example 5: preparation of Compound C-715

Synthesis of Compound 5-1

4-chloronaphtho [1,2-b ]]Benzofuran (50.0g, 198mmol), 4,4,4',4',5,5,5',5' -octamethyl-2, 2' -bis (1,3, 2-dioxaborolan) (65.3g, 257mmol), Pd₂(dba)₃(9.06g, 9.89mmol), s-phos (8.13g, 19.8mmol), KOAc (58.3g, 399mmol), and 1000mL 1, 4-dioxane were introduced into the flask, and the mixture was stirred at 130 ℃ under refluxStirring for 3 hours. After the completion of the reaction, the reaction mixture was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 5-1(51.2g, yield: 75%).

Synthesis of Compound 5-2

Compound 5-1(50.2g, 146mmol), 2-bromo-5-chloro-benzaldehyde (33.6g, 153mmol), tetrakis (triphenylphosphine) palladium (0) (5.06g, 4.38mmol), NaOH (17.5g, 438mmol), 500mL THF, and 250mL H₂O was introduced into the flask and the mixture was stirred at 130 ℃ for 2 hours under reflux. After the reaction is completed, the reaction mixture is treated with NH₄Neutralizing with Cl aqueous solution, extracting with EA, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 5-2(36.0g, yield: 69.1%).

Synthesis of Compound 5-3

Compound 5-2(36.0g, 100.9mmol), (methoxymethyl) triphenylphosphonium chloride (51.9g, 151.3mmol), and 500mL of THF were introduced into a flask, and 151.3mL of a 1M K-Ot-Bu solution in THF was added dropwise thereto while stirring at 0 ℃. The mixture was stirred for 3 hours with NH₄Neutralized with Cl, extracted with EA and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 5-3(38.0g, yield: 98%).

Synthesis of Compound 5-4

Compound 5-3(37.0g, 96.1mmol) was dissolved in 550mL of MC in a flask, and 251mL of BF was added dropwise thereto while stirring at 0 deg.C₃EtOEt. After the reaction was complete, the reaction mixture was washed with NaHCO₃Neutralizing, extracting with MC, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 5-4(13.6g, yield: 40.1%).

Synthesis of Compound C-715

Will combine withSubstance 5-4(4.80g, 13.6mmol), N-phenyldibenzofuran-3-amine (3.7g, 14.3mmol), Pd₂(dba)₃(0.559g, 0.680mmol), s-phos (0.501g, 1.36mmol), NaOt-Bu (2.61g, 27.2mmol), and 70mL o-xylene were introduced into the flask, and the mixture was stirred at 190 ℃ for 1.5 hours. After completion of the reaction, the mixture was cooled to room temperature and separated by column chromatography. Then, the solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-715(3.9g, yield: 49.8%).

Compound (I)	MW	Melting Point
			C-715	575.67	258.9℃

Example 6: preparation of Compound C-13

Synthesis of Compound 6-1

The compound 5-4(9.0g, 25.5mmol), 4,4,4',4',5,5,5',5' -octamethyl-2, 2' -bis (1,3, 2-dioxaborolan) (8.43g, 33.2mmol), Pd₂(dba)₃(1.17g, 1.28mmol), s-phos (1.05g, 2.55mmol), KOAc (7.50g, 76.5mmol), and 130mL of 1, 4-dioxane were introduced into the flask, and the mixture was stirred at 130 ℃ for 3 hours under reflux. After the reaction is completed, the reaction is mixedThe substance was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain compound 6-1(10.5g, yield: 92.7%).

Synthesis of Compound C-13

The compound 6-1(5.0g, 11.3mmol), 2-chloro-4, 6-diphenyl-1, 3, 5-triazine (3.03g, 11.3mmol), tetrakis (triphenylphosphine) palladium (0) (0.650g, 0.563mmol), K₂CO₃(3.88g, 28.1mmol), 30mL toluene, 10mL EtOH, and 10mL H₂O was introduced into the flask and the mixture was stirred at 130 ℃ for 2 hours under reflux. After completion of the reaction, the reaction mixture was filtered and dried. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-13(2.5g, yield: 40.3%).

Compound (I)	MW	Melting Point
			C-13	549.63	297.4℃

Example 7: preparation of Compound C-220

The compound 4-1(4.7g, 10.2mmol), 2-chloro-4- (dibenzo [ b, d ]]Furan-1-yl) -6-phenyl-1, 3, 5-triazine (3.84g, 10.7mmol), tetrakis (triphenylphosphine) palladium (0) (0.589g，0.51mmol)、K₂CO₃(3.52g, 25.5mmol), 30.0mL toluene, 10.0mL EtOH, and 10.0mL H₂O was introduced into the flask and the mixture was stirred at 140 ℃ for 2 hours under reflux. After completion of the reaction, the reaction mixture was diluted by addition of water, extracted with EA, and MgSO₄And (5) drying. The residue was separated by column chromatography, and a solid obtained by adding MeOH was filtered under reduced pressure to obtain Compound C-220(3.6g, yield: 53.8%).

Compound (I)	MW	Melting Point
			C-220	655.78	346.5℃

Apparatus example 1: production of Red-emitting OLEDs according to the disclosure

Producing an OLED comprising a compound according to the present disclosure. A transparent electrode Indium Tin Oxide (ITO) thin film (10 Ω/sq) (geomaoma co., ltd., Japan) on a glass substrate for an OLED was sequentially ultrasonically washed with acetone and isopropanol, and then stored in isopropanol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 was introduced into one cell of the vacuum vapor deposition apparatus, and Compound HT-1 was introduced into the other cell. Two materials were evaporated at different rates, and Compound HI-1 was deposited at a doping amount of 3 wt% based on the total amount of Compound HI-1 and Compound HT-1 to form a film having a thickness of 1 on the ITO substrateA hole injection layer of 0nm thickness. Next, the compound HT-1 was introduced into one cell of the vacuum vapor deposition apparatus and evaporated by applying a current to the cell, thereby forming a first hole transport layer having a thickness of 80nm on the hole injection layer. Then, the compound HT-2 was introduced into another cell of the vacuum vapor deposition apparatus and evaporated by applying a current to the cell, thereby forming a second hole transport layer having a thickness of 60nm on the first hole transport layer. After forming the hole injection layer and the hole transport layer, a light emitting layer is formed thereon as follows: the compound C-686 was introduced as a host into one cell of the vacuum vapor deposition apparatus, and the compound D-39 was introduced as a dopant into the other cell. The two materials were evaporated at different rates, and the dopant was deposited in a doping amount of 3 wt% based on the total amount of the host and the dopant to form a light emitting layer having a thickness of 40nm on the second hole transporting layer. The compound ETL-1 and the compound EIL-1 were evaporated in a weight ratio of 50:50 as electron transport materials to form an electron transport layer having a thickness of 35nm on the light emitting layer. After the compound EIL-1 was deposited as an electron injection layer having a thickness of 2nm on the electron transport layer, an Al cathode having a thickness of 80nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thus, an OLED was produced. All compounds used as materials are in the range of 10^-6Purification was done by vacuum sublimation under torr.

Apparatus example 2: production of Red-emitting OLEDs according to the disclosure

An OLED was produced in the same manner as in device example 1, except that compound C-700 was used as a host of the light emitting layer.

Comparative example: production of OLEDs comprising comparative Compounds as hosts

An OLED was produced in the same manner as in device example 1, except that compound CBP was used as a host of the light emitting layer.

The driving voltage, the light emission efficiency, and the light emission color at a luminance of 1,000 nits of the OLEDs produced in device examples 1 and 2 and the comparative example, and the time taken for the luminance to decrease from 100% to 95% at a luminance of 5,000 nits (lifetime; T95) are provided in table 1 below.

[ Table 1]

The OLED including the organic electroluminescent compound according to the present disclosure as a host shows lower driving voltage, higher luminous efficiency, and excellent life characteristics, compared to the OLED using the compound of the comparative example.

Device examples 3 to 6: production of Red-emitting OLEDs according to the disclosure

Producing an OLED according to the present disclosure. A transparent electrode Indium Tin Oxide (ITO) film (10 Ω/sq) (giomama, japan) on a glass substrate for an OLED was ultrasonically washed with acetone and isopropanol in this order, and then stored in isopropanol. The ITO substrate was then mounted on a substrate holder of a vacuum vapor deposition apparatus. Compound HI-1 was introduced into one cell of the vacuum vapor deposition apparatus, and Compound HT-1 was introduced into the other cell. The two materials were evaporated at different rates, and the compound HI-1 was deposited at a doping amount of 3 wt% based on the total amount of the compound HI-1 and the compound HT-1 to form a hole injection layer having a thickness of 10nm on the ITO substrate. Next, the compound HT-1 was introduced into one cell of the vacuum vapor deposition apparatus and evaporated by applying a current to the cell, thereby forming a first hole transport layer having a thickness of 80nm on the hole injection layer. Then, the compound HT-2 was introduced into another cell of the vacuum vapor deposition apparatus and evaporated by applying a current to the cell, thereby forming a second hole transport layer having a thickness of 60nm on the first hole transport layer. After forming the hole injection layer and the hole transport layer, a light emitting layer is formed thereon as follows: the first host material and the second host material shown in table 2 below were introduced as hosts into two cells of a vacuum vapor deposition apparatus, respectively, and the compound D-39 was introduced as a dopant into the other cell. Two main types are combinedThe bulk material was evaporated at a rate of 1:1 and the dopant material was simultaneously evaporated at different rates, and the dopant was deposited at a doping amount of 3 wt% based on the total amount of the host and the dopant to form a light emitting layer having a thickness of 40nm on the second hole transporting layer. The compound ETL-1 and the compound EIL-1 were evaporated in a weight ratio of 50:50 as electron transport materials to form an electron transport layer having a thickness of 35nm on the light emitting layer. After the compound EIL-1 was deposited as an electron injection layer having a thickness of 2nm on the electron transport layer, an Al cathode having a thickness of 80nm was deposited on the electron injection layer by another vacuum vapor deposition apparatus. Thus, an OLED was produced. All compounds used as materials are in the range of 10^-6Purification was done by vacuum sublimation under torr.

The driving voltage, the light emission efficiency, and the light emission color at a luminance of 1,000 nits, and the time taken for the luminance to decrease from 100% to 95% at a luminance of 5,000 nits (lifetime; T95) of the OLEDs produced in device examples 3 to 6 are provided in table 2 below.

[ Table 2]

The OLED according to the present disclosure exhibits a low driving voltage, high light emitting efficiency, and remarkably excellent life characteristics.

[ Table 3]