1. A high-color-purity platinum (II) complex luminescent material based on a spirofluorene structure is characterized in that the platinum (II) complex luminescent material has a structure shown in a general formula (I):

wherein:

R^a、R^b、R^cand R^dEach independently is hydrogen, deuterium, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, halogen, hydroxy, mercapto, nitro, cyano, amino, mono-or dialkylamino, mono-or diarylamino, alkoxy, aryloxy, haloalkyl, ester, nitrile, isonitrile, heteroaryl, alkoxycarbonyl, amido, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramido, imine, sulfo, carboxyl, hydrazine, substituted silyl, a polymeric group, or a combination thereof;

R¹、R²、R³、R⁴、R⁵、R⁶and R⁷Each independently represents a mono-, di-, tri-, tetra-or unsubstituted substituent, and R¹、R²、R³、R⁴、R⁵、R⁶And R⁷Each independently is hydrogen, deuterium, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, halogen, hydroxy, mercapto, nitro, cyano, amino, mono-or dialkylamino, mono-or diarylamino, alkoxy, aryloxy, haloalkyl, ester, nitrile, isonitrile, heteroaryl, alkoxycarbonyl, amido, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramido, imine, sulfo, carboxyl, hydrazine, substituted silyl, a polymeric group, or a combination thereof; and two or more adjacent R¹、R²、R³、R⁴、R⁵、R⁶And R⁷Each independently or selectively joined to form a fused ring.

2. The spirofluorene structure-based high color purity platinum (II) complex light-emitting material according to claim 1, wherein the platinum (II) complex has a structure of one of:

3. the spirofluorene structure-based high color purity platinum (II) complex light-emitting material according to claim 1 or 2, wherein the platinum (II) complex has a rigid structure based on biphenyl linkage, and simultaneously has a spirofluorene biphenyl group and a derivative structure thereof.

4. Use of the spirofluorene structure-based high-color-purity platinum (II) complex luminescent material as defined in any one of claims 1-2 in an optical device.

5. Use according to claim 4, wherein the optical device comprises a full-color display, a photovoltaic device, a light-emitting display device, an organic light-emitting diode or a phosphorescent organic light-emitting diode.

Background

OLEDs, i.e., organic light emitting diodes or organic light emitting devices, convert electrical energy into light energy through electroluminescence, and have great potential in developing new generation flat panel displays and energy-saving solid-state light sources. The OLED display technology has the following advantages: self-luminous, flexible, fast response speed, transparent display, low driving voltage, high luminous efficiency and resolution, high contrast, wide viewing angle, etc. It has become a new generation of full-color display and illumination technology, and has wide and huge application prospect in the fields of electronic products such as mobile phones, computers, televisions, bendable and foldable screens and the like.

The organic semiconductor of the light-emitting element is the most critical material element in the organic electroluminescent element, and the display device adopts the light-emitting material with high color purity, so that the true color can be restored as much as possible, and more excellent color expression is brought. However, the currently available materials still have the disadvantages of low efficiency of emission and low color purity (broad emission spectrum), and the use of optical filters to remove unnecessary colors results in a significant reduction in the brightness and luminous efficiency of the display screen. Therefore, development of a luminescent material having a narrow spectrum and high color purity is urgently required.

Disclosure of Invention

Aiming at the problem of wider light-emitting spectrum in the prior art, the invention aims to provide a tetradentate ring metal platinum (II) complex light-emitting material with narrow spectral emission and high color purity, and the light-emitting material can be used in the fields of OLED display and illumination.

In order to achieve the above object, the present invention provides a high color purity platinum (II) complex luminescent material based on a spirofluorene structure, wherein the platinum (II) complex luminescent material has a structure represented by a general formula (I):

wherein:

R^a、R^b、R^cand R^dEach independently hydrogen, deuterium, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, halogen, hydroxy, mercapto, nitro, cyano, amino, mono-or dialkylamino, mono-or diarylamino, alkoxy, aryloxy, haloalkyl, ester group, nitrile group, isonitrile group, heteroaryl, alkoxycarbonyl, amide groupA group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfonylamino group, sulfamoyl group, carbamoyl group, alkylthio group, sulfinyl group, ureido group, phosphoramido group, imino group, sulfo group, carboxyl group, hydrazino group, substituted silyl group, polymeric group, or a combination thereof;

R¹、R²、R³、R⁴、R⁵、R⁶and R⁷Each independently represents a mono-, di-, tri-, tetra-or unsubstituted substituent, and R¹、R²、R³、R⁴、R⁵、R⁶And R⁷Each independently is hydrogen, deuterium, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, halogen, hydroxy, mercapto, nitro, cyano, amino, mono-or dialkylamino, mono-or diarylamino, alkoxy, aryloxy, haloalkyl, ester, nitrile, isonitrile, heteroaryl, alkoxycarbonyl, amido, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramido, imine, sulfo, carboxyl, hydrazine, substituted silyl, a polymeric group, or a combination thereof; and two or more adjacent R¹、R²、R³、R⁴、R⁵、R⁶And R⁷Each independently or selectively joined to form a fused ring.

Further, the high color purity platinum (II) complex light-emitting material based on the spirofluorene structure is specifically, but not limited to, a compound represented by the following structure:

further, the platinum (II) complex has a rigid structure based on biphenyl linkage, and large substituent groups such as spirofluorene biphenyl group and derivatives thereof regulate intermolecular force.

Further, the spirofluorene structure-based high-color-purity platinum (II) complex luminescent material is applied to an optical device.

Further, the optical device includes a full color display, a photovoltaic device, a light emitting display device, an organic light emitting diode, or a phosphorescent organic light emitting diode.

Compared with the prior art, the invention has the beneficial effects that: the invention adjusts the photophysical property of the metal platinum (II) complex by changing the bridging atom of the ligand and regulating and controlling the substituent structure and position on the ligand. The biphenyl ligand bridged by carbon atoms is used to enhance the rigidity of molecules, thereby reducing non-radiative transition caused by rotation and vibration of ligand molecules, realizing narrow-spectrum emission, improving the emission quantum efficiency of materials and improving the color purity of emitted light. Meanwhile, spirofluorene rings and derivatives thereof are introduced into the ligand, so that the formation of an excimer is inhibited by increasing the steric hindrance between molecules, the triplet-triplet quenching caused by the interaction between the molecules is reduced, the quantum efficiency is improved, and the luminescent color purity of the molecule is improved. The phosphorescent material is a phosphorescent material with narrow spectrum and high color purity, and has a great application prospect in the field of OLED materials.

Drawings

FIG. 1 is a graph of an emission spectrum of a platinum (II) complex Pt-1 in a dichloromethane solution at room temperature in accordance with an embodiment;

FIG. 2 is a graph of an emission spectrum of a platinum (II) complex Pt-1-t in a dichloromethane solution at room temperature in accordance with an embodiment;

FIG. 3 is a combination of the emission spectra of the platinum (II) complexes Pt-1 and Pt-1-t in the embodiment at room temperature in dichloromethane solution.

Fig. 4 is a schematic structural diagram of an organic light emitting device.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description and the examples included therein.

The following examples, which are merely exemplary of the present disclosure and are not intended to limit the scope thereof, provide those of ordinary skill in the art with a description of how to make and evaluate the compounds described herein and their OLED devices. Although efforts have been made to ensure accuracy with respect to numbers (e.g., amounts, temperature, etc.), some errors and deviations should be accounted for. Unless otherwise specified, temperature is in units of ° c or at ambient temperature, and pressure is at or near atmospheric pressure.

The following examples provide methods for the preparation of the novel compounds, but the preparation of such compounds is not limited to this method. In this area of expertise, the compounds protected in this patent can be prepared by the methods listed below or by other methods, since they are easy to modify. The following examples are given by way of example only and are not intended to limit the scope of the patent. The temperature, catalyst, concentration, reactants, and course of reaction can all be varied to select different conditions for the preparation of the compound for different reactants.

Performed on a Varian Liquid State NMR instrument¹H NMR (500MHz) and¹³c NMR (126MHz) spectroscopy. Unless otherwise specified, nuclear magnetic treatment with DMSO-d₆Or CDCl containing 0.1% TMS₃As a solvent, wherein¹H NMR spectrum ofCDCl₃If the solvent is tetramethylsilane as an internal standard, tetramethylsilane (δ 0.00ppm) is referred to for chemical shift; otherwise, if CDCl is used₃Is a solvent, and is prepared by mixing the components,¹h NMR spectrum chemical shifts were referenced to residual solvent (δ 7.26 ppm); with DMSO-d₆As a solvent, TMS (δ 0.00ppm), or residual DMSO peak (δ 2.50ppm) or residual water peak (δ 3.33ppm) was used as an internal standard.¹³In the C NMR spectrum, as CDCl₃(delta 77.00ppm) or DMSO-d₆(δ 39.52ppm) as an internal standard.¹H NMR spectrum data: s is singlets, singlets; d ═ doublet, doublet; t is triplet, triplet; q ═ quartz, quartet; p ═ quintet, quintet; m ═ multiplex, multiplet; br ═ broad, broad peak.

Synthetic route

The general synthesis procedure was as follows:

example 1: the luminescent material Pt 1 can be synthesized according to the following route:

(1) and (3) synthesis of an intermediate 1-OH: to a dry three-necked flask with a magnetic stir bar was added o-bromobiphenyl (2.56g,11.0mmol,1.7 equivalents) and tetrahydrofuran (70mL) was added under nitrogen. The reaction apparatus was placed in an ethanol bath, cooled to-78 ℃ with liquid nitrogen, and then n-butyllithium (7.00mL, 11.00mmol, 1.7 equiv., 1.60mol/L n-hexane solution) was slowly added dropwise, after reaction for 3 hours, 3-bromophenyl-2-pyridone (1.80mg, 6.90mmol, 1.00 equiv.) was added, and stirred at room temperature for 24 hours. The reaction solution was quenched with a saturated solution of ammonium chloride, ethyl acetate was added thereto for extraction three times, and the aqueous layer was extracted twice with ethyl acetate. The organic phases were combined, dried over anhydrous sodium sulfate, filtered and the filtrate was distilled under reduced pressure to remove the solvent. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate 20:1 to 10:1 to giveThe product A-OH was 2.60g of an oily colorless transparent liquid, yield 90%.¹H NMR(500MHz,DMSO):δ6.71(s,1H),6.88-6.86(m,3H),6.95(t,J＝7.0Hz,2H),7.03-6.98(m,2H),7.06(ddd,J＝1.0,5.0,6.0Hz,1H),7.14(t,J＝8.0Hz,1H),7.25(td,J＝1.5,7.5Hz,1H),7.33-7.29(m,3H),7.44-7.42(m,1H),7.47(td,J＝1.5,7.5Hz,1H),7.59(t,J＝2.0Hz,1H),8.35(dq,J＝0.5,4.5Hz,1H)。

(2) Synthesis of intermediate 1-Br: A-OH (1.00g, 2.40mmol, 1.00 equiv.) and acetic acid (25mL) were added to a dry three-necked flask with a magnetic stir bar, followed by concentrated sulfuric acid (1mL) and acetic anhydride (1 mL). The three-neck flask is put into an oil bath kettle with magnetic stirring, the reaction is stirred for 12 hours at the temperature of 130 ℃, and the thin-layer chromatography is used for monitoring until the reaction of the raw materials is finished. After the reaction was cooled to room temperature, the solvent was removed by distillation under reduced pressure, and the pH was adjusted to weak alkalinity with a saturated solution of sodium carbonate. Then ethyl acetate is added for extraction for three times, the water layer is extracted twice by ethyl acetate, the combined organic phase is dried by anhydrous sodium sulfate, and the filtrate is decompressed and distilled to remove the solvent after filtration. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate 10:1-5:1 gave 920mg of a white solid in 96% yield.¹H NMR(500MHz,DMSO-d₆):δ7.04-6.98(m,3H),7.20(t,J＝7.5Hz,1H),7.28(ddd,J＝6.0,5.0,1.0Hz,1H),7.35(td,J＝7.5,1.0Hz,2H),7.40(ddd,J＝3.0,2.0,1.0Hz,1H),7.44(td,J＝7.5,1.0Hz,2H),7.57(d,J＝7.5Hz,2H),7.66(td,J＝7.5,2.0Hz,1H),7.95(d,J＝7.5Hz,2H),8.59(ddd,J＝2.5,1.5,0.5Hz,1H)。

(3) Synthesis of intermediate 2-Br: to a dry three-necked flask with a magnetic stir bar was added 3-bromocarbazole (500mg, 2.03mmol, 1.00 equiv.), cuprous iodide (39mg,0.20mmol,10 mol%), 1-methylimidazole (33mg,0.41mmol,20 mol%) and lithium tert-butoxide (325mg,4.06mmol,2.0 equiv.), then nitrogen was purged three times and 2-bromopyridine (353mg,2.23mmol,1.1 equiv.) and toluene (10mL) were added under nitrogen. The mixture was stirred in an oil bath at 120 ℃ for 24 hours and monitored by thin layer chromatography until the reaction of the starting materials was complete. The reaction mixture was cooled to room temperature, and the solvent was distilled off under reduced pressure. Separating and purifying the obtained crude product by using a silica gel chromatographic column, eluting a eluent: petroleum ether/ethyl acetate 100:1-50:1 to give 2-Br,640mg of colorless oily liquid, yield 97%.¹H NMR(500MHz,CDCl₃):δ7.36-7.32(m,2H),7.43(dd,J＝8.0,1.5Hz,1H),7.48-7.45(m,1H),7.63(d,J＝8.0Hz,1H),7.78(d,J＝8.0Hz,1H),7.98-7.96(m,2H),8.01(d,J＝1.5Hz,1H),8.09(d,J＝8.0Hz,1H),8.75-8.75(m,1H)。

(4) Synthesis of intermediate 2-B: to a dry sealed tube with a magnetic stirrer was added 2-Br (1.00g,3.09mmol,1.00 equiv.), bispinanol borate (1.18g, 4.64mmol, 1.50 equiv), [1,1' -bis (diphenylphosphino) ferrocene]Palladium dichloride (68mg, 0.09mmol, 3 mol%), potassium acetate was added quickly, then nitrogen was purged three times and dimethyl sulfoxide (20mL) was added under nitrogen blanket. And then putting the sealed tube into an oil bath kettle with magnetic stirring, stirring and reacting for 1 day in the oil bath kettle at the temperature of 80 ℃, and monitoring by thin-layer chromatography until the reaction of the raw materials is finished. The reaction was cooled to room temperature, diluted with ethyl acetate, the organic phase was washed twice with water and the aqueous layer was extracted twice with ethyl acetate. And combining organic phases, drying the organic phases by using anhydrous sodium sulfate, filtering the organic phases, distilling the filtrate under reduced pressure to remove the solvent, separating the obtained crude product by using a silica gel chromatographic column, and eluting the eluent: petroleum ether/ethyl acetate 20:1-10:1 gave 785mg of white solid in 69% yield.¹H NMR(500MHz,CDCl₃):δ1.37(s,12H),7.34-7.30(m,2H),7.48-7.44(m,1H),7.67(d,J＝9.0Hz,1H),7.78(d,J＝7.5Hz,1H),7.83(d,J＝8.5Hz,1H),7.97(td,J＝8.0,1.5Hz,1H),8.15-8.12(m,2H),8.20(s,1H),8.76(d,J＝3.5Hz,1H)。

(5) Synthesis of Ligand Ligand 1: to a dry three-necked flask with a magnetic stirrer was added 2-B (350mg, 0.95mmol, 1.00 equiv.), 1-Br (377mg, 0.95mmol, 1.00 equiv.), palladium tetrakistriphenylphosphine (55mg, 0.047mmol, 5 mol%) and potassium carbonate (261mg, 1.89mmol, 2.0 equiv.). The nitrogen was then purged three times and 1, 4-dioxane (12mL) and water (3mL) were added under nitrogen. And then putting the three-neck flask into an oil bath kettle with magnetic stirring, stirring and reacting for 24 hours at the temperature of 90 ℃, and monitoring by thin layer chromatography until the reaction of the raw materials is finished. The reaction was cooled to room temperature, and the solvent was distilled off under reduced pressure. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate/dichloromethane-20: 1:1-10:1:1 to give L (bp-1) as a white solid528mg, yield 98%.¹H NMR(500MHz,DMSO-d₆):δ6.98-6.97(m,1H),7.14(d,J＝8.0Hz,1H),7.23(t,J＝1.5Hz,1H),7.29(ddd,J＝5.5,5.0,0.5Hz,1H),7.35-7.31(m,4H),7.48-7.42(m,4H),7.56-7.54(m,2H),7.63(d,J＝8.0Hz,2H),7.67(td,J＝8.0,2.0Hz,1H),7.79-7.77(m,3H),7.95(d,J＝7.5Hz,2H),8.14(td,J＝8.0,2.0Hz,1H),8.26-8.22(m,2H),8.59(dd,J＝4.5,1.0Hz,1H),8.72(dd,J＝5.0,1.5Hz,1H)。

(6) Synthesis of Pt 1: to a dry three-necked flask with a magnetic stir bar was added Ligand 1(200mg, 0.36mmol, 1.00 equiv.) and platinum dichloride (100mg, 0.37mmol, 1.05 equiv.), then nitrogen was purged three times and benzonitrile (17mL) was added under nitrogen blanket. The three-neck flask is put into an oil bath kettle with magnetic stirring, the reaction is carried out for 1 day under the stirring of 180 ℃, and the thin-layer chromatography is used for monitoring until the reaction of the raw materials is finished. After the reaction was cooled to room temperature, the solvent was removed in distillation under reduced pressure. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/dichloromethane ═ 1:1-1:2, 213mg of an orange-red solid were obtained in 79% yield.¹H NMR(500MHz,DMSO-d₆):δ6.05-6.03(m,1H),6.53(t,J＝7.0Hz,1H),7.10(d,J＝8.0Hz,2H),7.17-7.16(m,1H),7.27(s,1H),7.39-7.32(m,3H),7.50-7.47(m,1H),7.56-7.53(m,2H),7.62(d,J＝7.5Hz,2H),7.66-7.65(m,1H),7.91-7.87(m,2H),8.13-8.06(m,3H),8.27-8.23(m,1H),8.35(d,J＝8.5Hz,1H),8.73(dd,J＝6.0,1.5Hz,1H),9.11(dd,J＝6.0,1.5Hz,1H),9.51(s,1H)。

Example 2: the luminescent material Pt 1-t can be synthesized according to the following route:

(1) and (3) synthesizing an intermediate 1-OH-t: to a dry three-necked flask with a magnetic stir bar was added 2-bromo-4, 4' -di-tert-butylbiphenyl (1.26g,3.63mmol,1.0 eq.) and tetrahydrofuran (40mL) was added under nitrogen. The reaction device is placed in an ethanol bath, the temperature is reduced to-78 ℃ by liquid nitrogen, then n-butyllithium (2.30mL, 3.63mmol,1.0 equivalent and 1.60mol/L n-hexane solution) is slowly dropped, after 3 hours of reaction, 3-bromophenyl-2-pyridylmethone (1.00 mg) is added3.80mmol, 1.05 eq), stirred at room temperature for 24 hours. The reaction solution was quenched with a saturated solution of ammonium chloride, ethyl acetate was added thereto for extraction three times, and the aqueous layer was extracted twice with ethyl acetate. The organic phases were combined, dried over anhydrous sodium sulfate, filtered and the filtrate was distilled under reduced pressure to remove the solvent. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate 40:1-20:1 gave 1-OH-t as an oily, colorless, transparent liquid, 1.50g, yield 78%.¹H NMR(500MHz,CDCl₃):δ1.21(s,9H),1.25(s,9H),6.89(d,J＝8.0Hz,2H),7.06-7.00(m,4H),7.13-7.07(m,4H),7.28(t,J＝6.5Hz,2H),7.34(dd,J＝8.0,1.5Hz,1H),7.50(t,J＝7.5Hz,1H),7.54(s,1H),8.37(d,J＝4.5Hz,1H)。

(2) And (3) synthesizing an intermediate 1-Br-t: to a dry three-necked flask with a magnetic stirrer was added 1-Br-t (1.50g, 2.84mmol, 1.00 equiv.), acetic acid (25mL), followed by concentrated sulfuric acid (1.2mL), acetic anhydride (1 mL). The three-neck flask is put into an oil bath kettle with magnetic stirring, the reaction is stirred for 12 hours at the temperature of 130 ℃, and the thin-layer chromatography is used for monitoring until the reaction of the raw materials is finished. After the reaction was cooled to room temperature, the solvent was removed by distillation under reduced pressure, and the pH was adjusted to weak alkalinity with a saturated solution of sodium carbonate. Then ethyl acetate is added for extraction for three times, the water layer is extracted twice by ethyl acetate, the combined organic phase is dried by anhydrous sodium sulfate, and the filtrate is decompressed and distilled to remove the solvent after filtration. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate 20:1 to 10:1 gave 1.5g of an oily, colorless, transparent liquid in a yield of 99%.¹H NMR(500MHz,CDCl₃):δ1.30(s,18H),6.99(d,J＝6.0Hz,1H),7.16(s,1H),7.25-7.21(m,2H),7.40(dd,J＝8.0,1.5Hz,2H),7.51(s,1H),7.60(s,1H),7.65(d,J＝8.0Hz,3H),7.68-7.66(m,2H),8.71(s,1H)。

(3) Synthesis of Ligand 1-t: to a dry three-necked flask with a magnetic stirrer was added 2-B (381mg, 1.03mmol, 1.05 equiv.), 1-Br-t (500mg, 0.98mmol, 1.00 equiv.), palladium tetrakistriphenylphosphine (57mg, 0.049mmol, 5 mol%) and potassium carbonate (271mg, 1.96mmol, 2.0 equiv.). The nitrogen was then purged three times and 1, 4-dioxane (12mL) and water (3mL) were added under nitrogen. Then the three-neck flask is put into an oil bath kettle with magnetic stirring, and the temperature is 9 DEGThe reaction was stirred at 0 ℃ for 48 hours and monitored by thin layer chromatography until the reaction of the starting materials was complete. The reaction was cooled to room temperature, the solvent was distilled off under reduced pressure and diluted with ethyl acetate, the organic phase was washed twice with water and the aqueous layer was extracted twice with ethyl acetate. The organic phases were combined, dried over anhydrous sodium sulfate, filtered and the filtrate was distilled under reduced pressure to remove the solvent. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/ethyl acetate/dichloromethane ═ 20:3:1-15:3:1, Ligand 1-t was obtained as a white solid 520mg, yield 79%.¹H NMR(400MHz,DMSO-d₆):δ1.22(s,18H),7.08-7.03(m,2H),7.19(s,1H),7.26(t,J＝6.0Hz,1H),7.40-7.31(m,3H),7.47-7.42(m,3H),7.55-7.52(m,2H),7.68-7.64(m,3H),7.80-7.76(m,5H),8.11(t,J＝7.6Hz,1H),8.24(t,J＝6.4Hz,2H),8.61(d,J＝4.0Hz,1H),8.70(d,J＝4.8Hz,1H)。

(4) Synthesis of Pt 1-t: to a dry three-necked flask with a magnetic stir bar was added Ligand 1-t (300mg, 0.45mmol, 1.00 equiv.) and platinum dichloride (126mg, 0.47mmol, 1.05 equiv.), then nitrogen was purged three times and benzonitrile (20mL) was added under nitrogen blanket. The three-neck flask is put into an oil bath kettle with magnetic stirring, the reaction is carried out for 3 days under the stirring of 180 ℃, and the thin-layer chromatography is used for monitoring until the reaction of the raw materials is finished. The reaction was cooled to room temperature and the solvent was removed by distillation under the reduced pressure. Separating the obtained crude product by using a silica gel chromatographic column, and eluting the mixture by using an eluent: petroleum ether/dichloromethane ═ 3:1-1:1, 220mg of an orange-yellow solid were obtained in 56% yield.¹H NMR(500MHz,DMSO-d₆):δ0.98(s,9H),1.38(s,9H),6.09(dd,J＝8.0,1.0Hz,1H),6.54(t,J＝7.5Hz,1H),7.08(d,J＝7.5Hz,1H),7.16(dd,J＝7.5,0.5Hz,1H),7.34-7.28(m,3H),7.39-7.36(m,1H),7.50-7.47(m,1H),7.56-7.53(m,2H),7.62(d,J＝7.5Hz,1H),7.70-7.65(m,2H),7.91-7.87(m,1H),7.95(d,J＝7.0Hz,1H),8.06(d,J＝8.5Hz,1H),8.12(dd,J＝7.5,0.5Hz,1H),8.26-8.22(m,1H),8.32(d,J＝8.5Hz,1H),8.74-78.73(m,1H),9.12(dd,J＝5.5,1.5Hz,1H),9.75(s,1H)。

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Evaluation of Performance

The complexes prepared in the above examples of the present invention were subjected to photophysical analysis as follows.

And (3) photophysical analysis: the emission spectra were tested on HITACHI F-7000 spectrometer, and the emission spectra of the synthesized luminescent materials of examples 1 and 2 are shown in FIGS. 1-2. The test conditions of the emission spectrum of the complex luminescent material are as follows: all samples were in dilute dichloromethane (chromatographic grade) (10) solutions tested at room temperature^-5-10^-6M) and the half-peak width of the spectrum is the peak width at half the peak height of the spectrum, namely, a straight line parallel to the bottom of the peak is drawn through the middle point of the peak height, and the straight line is the distance between two intersecting points at two sides of the peak.

TABLE 1 photophysical Properties of phosphorescent materials in dichloromethane solution at room temperature

Luminescent material	Peak/nm	FWHM/nm
			Pt 1	560.2	27.8
Pt 1-t	560.6	27.6

Note: peak refers to the emission Peak of the emission spectrum of the luminescent material in dichloromethane solution at room temperature. FWHM refers to the full width at half maximum of the emission spectrum.

Fig. 1 to 2 show emission spectra of two luminescent materials in table 1 in a dichloromethane solution at room temperature. From the data, the maximum emission peaks of the tetradentate ring metal platinum (II) complexes of the biphenyl-carbazolyl and the spirofluorene ring in a dichloromethane solution at room temperature are both 560-561nm, the half-peak width is very small and is 27-28nm, the maximum emission peaks are all green luminescent materials with narrow spectrum emission, and the quantum efficiency can reach more than 50%. Fig. 3 is a combination graph of emission spectra of two kinds of luminescent materials synthesized in examples 1 and 2 at room temperature in a dichloromethane solution.

In addition, the embodiment of the invention also provides an optical device which comprises one or more of the high-color-purity platinum (II) complex luminescent materials based on the spirofluorene structure.

Optionally, the device comprises a full color display, a photovoltaic device, a light emitting display device, an organic light emitting diode, a phosphorescent organic light emitting diode.

In an organic light-emitting element, carriers are injected into a light-emitting material from both positive and negative electrodes, and the light-emitting material in an excited state is generated and emits light. The complex of the present invention represented by the general formula (1) can be used as a phosphorescent material for an excellent organic light-emitting device such as an organic photoluminescent device or an organic electroluminescent device. The organic photoluminescent element has a structure in which at least a light-emitting layer is formed over a substrate. The organic electroluminescent element has a structure in which at least an anode, a cathode, and an organic layer between the anode and the cathode are formed. The organic layer may be composed of only the light-emitting layer, or may have 1 or more organic layers other than the light-emitting layer. Examples of such other organic layers include a hole transport layer, a hole injection layer, an electron blocking layer, a hole blocking layer, an electron injection layer, an electron transport layer, and an exciton blocking layer. The hole transport layer may be a hole injection transport layer having a hole injection function, and the electron transport layer may be an electron injection transport layer having an electron injection function. Fig. 4 shows a schematic structure of a specific organic light-emitting device. In fig. 4, 7 layers are shown from bottom to top, and the substrate, the anode, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, and the cathode are sequentially shown, where the light-emitting layer is a mixed layer in which a guest material is doped into a host material.

The phosphorescent light-emitting material is doped into a host material as a guest material to prepare a light-emitting layer which can be applied to OLED devices, and the structure is shown as follows:

ITO/HATCN (10nm)/TAPC (65 nm)/host Material Pd (ACzCz-2) (10 wt.%, 20nm)/TmPyPB (55nm)/LiF/Al

Wherein, the ITO is a transparent anode; HATCN is a hole injection layer, TAPC is a hole transport layer, the host materials are mCBP and 26mCPy, respectively, TmPyPB is an electron transport layer, LiF is an electron injection layer, and Al is a cathode. The number in parentheses in nanometers (nm) is the thickness of the film.

The molecular formula of the applied material in the device is as follows:

it should be noted that the structure is an example of an application of the phosphorescent material of the present invention, and does not constitute a limitation of the structure of the specific OLED device of the phosphorescent material of the present invention, nor does the phosphorescent material be limited to the compounds shown in the examples.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. For example, many of the substituent structures described herein may be substituted with other structures without departing from the spirit of the invention.