1. Mn (manganese)⁴⁺-Sm³⁺The co-doped antimonate fluorescent powder with a double perovskite structure is characterized in that the chemical general formula of the fluorescent powder is as follows: ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Wherein x is a doped manganese ion Mn⁴⁺Taking x to be more than or equal to 0.001 and less than or equal to 0.3 in mol percent, wherein y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3.

2. Mn (manganese)⁴⁺-Sm³⁺The preparation method of the co-doped antimonate fluorescent powder with the double perovskite structure is characterized by mainly comprising the following steps:

step (1), taking a compound containing calcium ions, a compound containing gadolinium ions, a compound containing antimony ions, a compound containing manganese ions and a compound containing samarium ions as raw materials, and performing chemical reaction on the raw materials according to a chemical general formula Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Weighing each raw material according to the stoichiometric ratio of the corresponding elements; wherein x is a doped manganese ion Mn⁴⁺Taking x is more than or equal to 0.001 and less than or equal to 0.3, and y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3;

step (2), mixing and fully grinding the raw materials in the step (1), placing the mixture in a crucible after the mixture is uniformly ground, and pre-burning the mixture in an air atmosphere; wherein the presintering temperature is 550-1050 ℃, and the presintering time is 4-24 hours;

step (3) naturally cooling the mixture subjected to the pre-burning in the step (2) to a roomAnd (3) heating, fully and uniformly grinding again, calcining in an air atmosphere at the temperature of 1100-1500 ℃ for 3-12 hours, and naturally cooling to room temperature to obtain the compound with the chemical general formula of Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺The antimonate fluorescent powder with a double perovskite structure.

3. The method according to claim 2, wherein the step (1) contains Ca ion²⁺The compound of (A) is CaCO₃、CaO、Ca(HCO₃)₂、Ca(OH)₂One or more of (a).

4. The method according to claim 2, wherein step (1) comprises gadolinium (Gd) ion³⁺Is Gd₂O₃、Gd(NO₃)₃One or two of them.

5. The production method according to claim 2, wherein the antimony ions Sb are contained in the step (1)⁵⁺The compound of (A) is Sb₂O₅、NaSbO₃One or two of them.

6. The process according to claim 2, wherein the step (1) contains samarium ions Sm³⁺Compound (B) is Sm₂O₃、C₆H₉O₆One or two of Sm.

7. The method according to claim 2, wherein the compound containing manganese ions in the step (1) is MnO or MnCO₃、MnO₂、C₄H₆MnO₄One or more of (a).

8. A Mn as set forth in claim 1⁴⁺-Sm³⁺The co-doped double perovskite structure antimonate fluorescent powder is applied to temperature detection.

9. Use according to claim 8, characterized in that it is particularly intended to excite Mn with a short-wave blue excitation at a wavelength of 404 nm⁴⁺-Sm³⁺The co-doped double perovskite structure antimonate fluorescent powder is excited to have two fluorescence emission peaks respectively positioned at 611 nanometers and 677 nanometers, and the temperature of the environment where the fluorescent powder is positioned is calibrated according to the ratio of the intensities of the two emission peaks.

10. Use according to claim 8 or 9, characterized in that the temperature range of the environment in which the phosphor is located is 30-230 ℃.

Background

Temperature measurement faces new demands in everyday life, industrial production and other extremely dangerous environments. Generally, based on different thermometry methods, thermometry equipment can be divided into: contact thermometers and non-contact thermometers. For a conventional contact thermometer, the manner in which the temperature is obtained is straightforward. But the application scene and the temperature measurement performance can not meet many current requirements and requirements. Therefore, the development of a non-contact thermometer, especially an optical temperature measurement mode, has very important research value.

The earliest optical sensing thermometers were infrared thermometers, useful in medicine and where direct thermocouple contact is not possible. However, the infrared thermometer is easily affected by the nature of the substance to be measured and the external environment, and its cost is high, so that it has many limitations in application. In recent years, a novel optical temperature detection technology, i.e., a fluorescence temperature detection technology, is receiving attention from researchers. The technology utilizes the change of the fluorescence characteristic of a luminescent material along with the temperature to detect the temperature. In general, the fluorescence characteristics that can be used to detect temperature include emission intensity, peak position of emission peak, full width at half maximum of emission peak, fluorescence lifetime, fluorescence intensity ratio, and the like. Compared with other fluorescence characteristic temperature measurement modes, the fluorescence intensity ratio-based temperature measurement mode is not influenced by external environmental factors, spectral loss and an excitation light source. Therefore, the fluorescence intensity ratio has the advantages of high response speed and high sensitivity compared with the temperature detection.

The mainstream temperature probe material with fluorescence intensity ratio at present is a luminescent material taking single rare earth ions as a fluorescence activator. Selecting two energy levels with the ion positions relatively close to each other as thermal coupling energy levels. However, the emission peaks corresponding to these two energy levels are too close, e.g. Er³⁺Of ions²H_11/2And⁴S_3/2the emission peaks of (a) are located at 535 nm and 550 nm, respectively, and the spacing is only 15 nm. The fluorescent signal identification is not facilitated, the temperature sensitivity is further influenced, and the requirement for high-precision temperature measurement is difficult to meet.

The invention provides rare earth and transition metal ion co-doped antimonate fluorescent powder with a double perovskite structure. The fluorescent powder takes samarium ion emission as reference, and the emission peak of the fluorescent powder is positioned at 601 nm; the manganese ion emission is used as a temperature probe, and the emission peak is positioned at 677 nanometers. The two emission peaks are spaced 76 nm apart. The ratio of the two peak intensities changes very sharply with temperature, and the maximum absolute sensitivity calculated based on the calculation reaches 9.313 percent K^-1. Compared with the reported temperature detection material adopting the rare earth ion thermal coupling energy level, the sensitivity is improved by more than 10 times.

Disclosure of Invention

The first purpose of the present invention is to provide a Mn for the limitation of the current temperature detection technology⁴⁺And Sm³⁺The co-doped antimonate fluorescent temperature probe material with a double perovskite structure is expected to be applied to a fluorescent temperature detection device.

The technical scheme adopted by the invention is as follows:

mn (manganese)⁴⁺-Sm³⁺The co-doped antimonate fluorescent powder with a double perovskite structure has a chemical general formula as follows: ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Wherein x is a doped manganese ion Mn⁴⁺Taking x to be more than or equal to 0.001 and less than or equal to 0.3 in mol percent, wherein y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3. By adjusting Mn⁴⁺Ions and Sm³⁺The doping concentration of the ions can realize the temperature measurement performance with high sensitivity and high resolution.

The invention also aims to provide a preparation method of the fluorescent material in the technical scheme, which adopts a high-temperature solid phase method and mainly comprises the following steps:

step (1) to contain calcium ionsTaking compounds of seeds, compounds containing gadolinium ions, compounds containing antimony ions, compounds containing manganese ions and compounds containing samarium ions as raw materials, and obtaining the compound with the chemical general formula Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Weighing each raw material according to the stoichiometric ratio of the corresponding elements; wherein x is a doped manganese ion Mn⁴⁺Taking x to be more than or equal to 0.001 and less than or equal to 0.3 in mol percent, wherein y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3.

Step (2), mixing and fully grinding the raw materials in the step (1), placing the mixture in a crucible after grinding uniformly, presintering the mixture in an air atmosphere at the presintering temperature of 550-1050 ℃ for 4-24 hours;

step (3), naturally cooling the mixture subjected to the pre-sintering in the step (2) to room temperature, fully and uniformly grinding again, calcining in an air atmosphere at the calcining temperature of 1100-1500 ℃ for 3-12 hours, and naturally cooling to room temperature to obtain the compound with the chemical general formula of Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺The antimonate fluorescent powder with a double perovskite structure.

Further, the step (1) contains calcium ions Ca²⁺The compound of (A) is CaCO₃、CaO、Ca(HCO₃)₂、Ca(OH)₂One or more of; containing gadolinium ions Gd³⁺Is Gd₂O₃、Gd(NO₃)₃One or two of them; containing antimony ions Sb⁵⁺The compound of (A) is Sb₂O₅、NaSbO₃One or two of them; sm containing samarium ions³⁺Compound (B) is Sm₂O₃、C₆H₉O₆One or two of Sm; the compound containing manganese ions is MnO and MnCO₃、MnO₂、C₄H₆MnO₄One or more of (a).

The invention also aims to provide the application of the fluorescent material in the technical scheme on temperature detection.

Exciting Mn by using short-wave blue light with the wavelength of 404 nm⁴⁺-Sm³⁺The co-doped double perovskite structure antimonate fluorescent powder is excited to have two fluorescence emission peaks respectively positioned at 611 nanometers and 677 nanometers, and the temperature of the environment where the fluorescent powder is positioned is calibrated according to the ratio of the intensities of the two emission peaks.

Preferably, the temperature range of the environment in which the phosphor is placed is 30 to 230 ℃ (303K to 503K absolute).

Importantly, the absolute temperature sensitivity of the material reaches 9.313 percent K at most through actual temperature detection calculation^-1The relative sensitivity reaches 1.628 percent K at most^-1. Compared with other previously reported fluorescent temperature probe materials, the fluorescent temperature probe material has remarkable improvement.

Drawings

FIG. 1 is a graph of the emission spectra of phosphor samples prepared according to example 1 at different temperatures;

FIG. 2 is a graph of the intensity of two emission peaks versus temperature for a phosphor sample prepared according to example 1;

FIG. 3 is an exponential plot of the ratio of the intensity of the emission peak versus temperature;

fig. 4 is a calculated absolute sensitivity versus relative sensitivity curve.

Detailed Description

The invention will now be further analyzed with reference to the following examples, which are intended to illustrate the invention and any modifications and variations that may be made on the basis of the invention are within the scope of the invention.

Mn (manganese)⁴⁺-Sm³⁺The co-doped antimonate fluorescent temperature probe material with a double perovskite structure is characterized by having a chemical general formula as follows: ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Wherein x is a doped manganese ion Mn⁴⁺Taking x to be more than or equal to 0.001 and less than or equal to 0.3 in mol percent, wherein y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3. By adjusting Mn⁴⁺Ions and Sm³⁺The doping concentration of the ions can realize the temperature measurement performance with high sensitivity and resolution.

The preparation method of the fluorescent powder adopts a high-temperature solid phase method, and comprises the following steps:

step (1), taking a compound containing calcium ions, a compound containing gadolinium ions, a compound containing antimony ions, a compound containing manganese ions and a compound containing samarium ions as raw materials, and performing chemical reaction on the raw materials according to a chemical general formula Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺Weighing each raw material according to the stoichiometric ratio of the corresponding elements; wherein x is a doped manganese ion Mn⁴⁺Taking x to be more than or equal to 0.001 and less than or equal to 0.3 in mol percent, wherein y is doped samarium ions Sm³⁺The mole percentage of y is more than or equal to 0.001 and less than or equal to 0.3.

Step (2), mixing and fully grinding the raw materials in the step (1), placing the mixture in a crucible after grinding uniformly, presintering the mixture in an air atmosphere at the presintering temperature of 550-1050 ℃ for 4-24 hours;

step (3), naturally cooling the mixture subjected to the pre-sintering in the step (2) to room temperature, fully and uniformly grinding again, calcining in an air atmosphere at the calcining temperature of 1100-1500 ℃ for 3-12 hours, and naturally cooling to room temperature to obtain the compound with the chemical general formula of Ca₂GdSbO₆:xmol％Mn⁴⁺，ymol％Sm³⁺The antimonate fluorescent powder with a double perovskite structure.

Further, the step (1) contains calcium ions Ca²⁺The compound of (A) is CaCO₃、CaO、Ca(HCO₃)₂、Ca(OH)₂One or more of; containing gadolinium ions Gd³⁺Is Gd₂O₃、Gd(NO₃)₃One or two of them; containing antimony ions Sb⁵⁺The compound of (A) is Sb₂O₅、NaSbO₃One or two of them; sm containing samarium ions³⁺Compound (B) is Sm₂O₃、C₆H₉O₆One or two of Sm; the compound containing manganese ions is MnO and MnCO₃、MnO₂、C₄H₆MnO₄One or more of (a).

Example 1: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺FluorescencePowder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0105g, placing the mixture in an agate mortar, fully and uniformly grinding the mixture, placing the mixture in a crucible, presintering the mixture in the air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to the room temperature, and taking out the sample. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 9.313 percent K at most by calculation^-1。

The photoluminescence emission spectrum of 30-230 deg.C (303-503K) under short-wave blue light (404 nm) excitation condition can be detected by fluorescence spectrometer³⁺And Mn⁴⁺The dual mode of (2) light emission. From Sm with increasing temperature³⁺The emission intensity at 601 nm is only slightly changed, and is derived from Mn⁴⁺The emission intensity at 677 nm drops sharply (see figure 1). Calculating an intensity ratio according to the intensities of the two emission peaks measured by the spectrum; the temperature of the environment spoken by the material can then be calibrated by comparison in the exponential graph given in fig. 3. FIG. 2 shows the intensity of two emission peaks of a phosphor sample prepared according to example 1 as a function of temperature. FIG. 4 is a plot of absolute sensitivity versus relative sensitivity calculated from the test results for phosphors prepared according to example 1.

Example 2: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.01mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.01mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0035g, placing in an agate mortar, fully grinding uniformly, placing in a crucible, presintering in an air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling to room temperature, and taking out the sample. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.01mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 7.094 percent K at most by calculation^-1。

Example 3: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.05mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.05mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0174g of the powder is placed in an agate mortar to be fully and uniformly ground, then the powder is placed in a crucible to be presintered in the air atmosphere, the presintering temperature is 800 ℃, the presintering time is 12 hours, and after the powder is naturally cooled to the room temperature, the sample is taken out. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.05mol％Sm³⁺。

Measuring the temperature dependent photoluminescence emission spectrum of the sample by a fluorescence spectrometerTo from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 6.459 percent K at most by calculation^-1。

Example 4: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.10mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.10mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0349g of the powder is placed in an agate mortar to be fully and uniformly ground, then the powder is placed in a crucible to be presintered in the air atmosphere, the presintering temperature is 800 ℃, the presintering time is 12 hours, and after the powder is naturally cooled to the room temperature, the sample is taken out. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.10mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 5.394 percent K at most by calculation^-1。

Example 5: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.20mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.20mol％Sm³⁺And (3) respectively weighing CaO: 0.2240g, Gd (NO)₃)₃：0.6865g、Sb₂O₅：0.3235g、MnCO₃：0.0011g，Sm₂O₃: 0.0697g, placing the mixture in an agate mortar, fully grinding the mixture uniformly, placing the mixture in a crucible, presintering the mixture in an air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to room temperature, and taking out the sample. Fully grinding the sample mixture after pre-burningAfter being uniform, the mixture is calcined in the air atmosphere, the calcination temperature is 1450 ℃, the calcination time is 6 hours, and then the mixture is cooled to the room temperature along with the furnace, so that the target product Ca is obtained₂GdSbO₆:0.005mol％Mn⁴⁺，0.20mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 3.506 percent K at most by calculation^-1。

Example 6: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.30mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.30mol％Sm³⁺Respectively weighing Ca (OH) according to the stoichiometric ratio of the corresponding elements₂：0.2964g、Gd(NO₃)₃：0.6865g、Sb₂O₅：0.3235g、MnCO₃：0.0011g，Sm₂O₃: 0.1046g of the powder is placed in an agate mortar to be fully and uniformly ground, then the powder is placed in a crucible to be presintered in the air atmosphere, the presintering temperature is 800 ℃, the presintering time is 12 hours, and after the powder is naturally cooled to the room temperature, the sample is taken out. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.30mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 2.258 percent K at most by calculation^-1。

Example 7: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0105g, placing the mixture in an agate mortar, fully and uniformly grinding the mixture, placing the mixture in a crucible, presintering the mixture in the air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to the room temperature, and taking out the sample. Fully and uniformly grinding the sample mixture after pre-sintering, calcining the sample mixture in the air atmosphere at 1400 ℃ for 7 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 8.955 percent K at most by calculation^-1。

Example 8: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0105g, placing the mixture in an agate mortar, fully and uniformly grinding the mixture, placing the mixture in a crucible, presintering the mixture in the air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to the room temperature, and taking out the sample. Fully and uniformly grinding the sample mixture after pre-sintering, calcining the sample mixture in air atmosphere at 1350 ℃ for 8 hours, and then cooling the sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 7.635 percent K at most by calculation^-1。

Example 9: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Respectively weighing CaCO according to the stoichiometric ratio of corresponding elements₃：0.4g、Gd₂O₃：0.3625g、Sb₂O₅：0.3235g、MnO：0.0007g，Sm₂O₃: 0.0105g, placing the mixture in an agate mortar, fully and uniformly grinding the mixture, placing the mixture in a crucible, presintering the mixture in the air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to the room temperature, and taking out the sample. Fully and uniformly grinding the sample mixture after pre-sintering, calcining the sample mixture in air atmosphere at 1250 ℃ for 10 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 6.544 percent K at most by calculation^-1。

Example 10: preparation of Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺Fluorescent powder

According to the general formula Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺And (3) respectively weighing CaO: 0.2240g, Gd (NO)₃)₃：0.6865g、NaSbO₃：0.3855g、MnCO₃：0.0011g，Sm₂O₃: 0.0105g, placing the mixture in an agate mortar, fully and uniformly grinding the mixture, placing the mixture in a crucible, presintering the mixture in the air atmosphere at the presintering temperature of 800 ℃ for 12 hours, naturally cooling the mixture to the room temperature, and taking out the sample. Fully and uniformly grinding the pre-sintered sample mixture, calcining the sample mixture in air atmosphere at 1450 ℃ for 6 hours, and then cooling the calcined sample mixture to room temperature along with the furnace to obtain the target product Ca₂GdSbO₆:0.005mol％Mn⁴⁺，0.03mol％Sm³⁺。

Measurement of the temperature-dependent photoemission spectrum of the sample by fluorescence spectroscopy from Sm³⁺And Mn⁴⁺The absolute sensitivity of the double-mode light emitting diode reaches 3.324 percent K at most by calculation^-1。

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.