Ultraviolet excitation tellurium-doped yttrium aluminum garnet fluorescent powder, preparation method and application thereof

Abstract

This invention discloses a UV-excited tellurium-doped yttrium aluminum garnet phosphor, its preparation method, and its applications. The phosphor is prepared using a sol-gel method, utilizing tellurium ions, which are low in toxicity and cost, as the luminescent ions. 3‑ x Al5O 12 :xTe 4+ YAG:Te phosphor, when effectively excited by ultraviolet light at 280nm, exhibits broadband emission covering 350nm-600nm and a full width at half maximum (FWHM) of nearly 150nm, which can meet the needs of high-quality lighting. Compared with the solid-state method, it can effectively avoid the volatilization of TeO2 at high temperatures and synthesize pure Te-doped YAG at low temperatures.

Description

Technical Field

[0001] This invention relates to the field of luminescent materials technology, and in particular to an ultraviolet-excited tellurium-doped yttrium aluminum garnet phosphor, its preparation method, and its application. Background Technology

[0002] With the continuous development of the information industry, luminescent materials have been used in display technology, scintillators, lasers, remote thermal imaging, solar energy converters, and concentrators for decades. Rare earth metals, transition metals, and main group elements are commonly used luminescent activators. Among them, main group elements, due to their unique electronic structure (ns... 2 It has attracted attention due to its type. 2 Type (n≥4) launch center (Sn) 2+ Sb 3+ 、Tl + Pb 2+ Bi 3+ Te 4+ The optical transition of ns occurs between the outer s and p shells, and the coordination field has a significant impact on the luminescence properties. The coordination electric field can be tuned by simply changing the host material and physical conditions. Furthermore, ns 2 Type-agent launch centers often exhibit strong emission with microsecond-level lifetimes and can be used as practical activators.

[0003] Te 4+ As a type of ns 2 Te-type ions, characterized by low toxicity, low cost, abundant reserves, and excellent optical properties, have gradually attracted the attention of researchers. Te, acting as a luminescent center, exhibits broadband emission characteristics from visible to near-infrared light when doped into different matrix materials. The emission spectrum can be modulated by changing the doping concentration and reaction temperature. Previous reports indicate that Te-doped luminescent materials display colors ranging from ultraviolet to infrared, depending on the chemical composition of the matrix and the melting temperature. 4+ Doped A₂SnCl₆ (A = Cs, K, Rb) and A₂ZrCl₆ (A = Rb, Cs) exhibit yellow emission at liquid helium (LHeT) temperatures. 4+ Zinc borate glass exhibits a blue emission center at 460 nm, and both its excitation and emission energies exhibit a redshift with increasing TeO2 content. The TeO2 in TeO2-Li2O glass... 4+ It exhibits broad red emission and a high quantum yield of 63%. Currently, Te... 4+ Activation systems are mainly concentrated on halides and glasses, and their emission characteristics are mostly detected at low temperatures. However, research on the luminescence properties of tellurium-doped oxide powders is scarce. Therefore, this study investigates a novel Te... 4+ The luminescent properties of active oxide powder systems are of great significance. Yttrium aluminum garnet (YAG, Y3Al5O3)12 As a common matrix, it has a cubic crystal structure, providing different polyhedral positions for cations, and therefore holds promise for studying Te. 4+ It is an ideal matrix for luminescence. However, the solid-state method for preparing YAG requires high temperatures, and Te can easily be released at high temperatures, making it impossible to prepare Te-doped YAG. Only at low temperatures can a mixture of Te-doped YAM (Y4Al2O9) and YAP (yttrium aluminate, YAlO3) be obtained.

[0004] This invention uses the sol-gel method to prepare Te-doped YAG. The powder prepared by this method has uniform particle size, small and easily controllable size, low synthesis temperature, and high purity. Summary of the Invention

[0005] To address the limitations of existing solid-state methods for preparing Te-doped YAG, this invention provides a UV-excited tellurium-doped yttrium aluminum garnet phosphor, its preparation method, and its applications. This invention employs a sol-gel method to prepare Te-doped YAG nanopowder. The prepared nanopowder exhibits uniform size, small particle size, and low synthesis wavelength, exhibiting UV excitation and broadband blue emission.

[0006] The technical solution of this invention is as follows:

[0007] A method for preparing ultraviolet-excited tellurium-doped yttrium aluminum garnet phosphor specifically includes the following steps:

[0008] S1) Weigh out aluminum salt and dissolve it in water, and record it as solution A; weigh out yttrium salt or Y2O3, tellurium salt or TeO2, add water and heat and stir, while stirring, add nitric acid until the powder is completely dissolved, and record it as solution B;

[0009] S2) Heat and stir solution A and solution B together, add citric acid solution dropwise until the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being released, to obtain a wet gel. After cooling to room temperature, dry the wet gel to obtain a dry gel.

[0010] S3) The dry gel was ground and then heated and sintered to obtain UV-excited tellurium aluminum garnet phosphor.

[0011] Furthermore, in step S1), the molar ratio of aluminum, yttrium, and tellurium in the aluminum salt, yttrium salt, or Y2O3, tellurium salt, or TeO2 is 5:3-x:x, where x = 0 to 0.04.

[0012] Further, in step S1), the aluminum salt includes one or more of Al(NO3)3·9H2O and AlCl3; the yttrium salt includes one or more of Y(NO3)3 and Y(NO3)3·6H2O; and the tellurium salt includes one or more of Te(NO3)4 and TeCl4.

[0013] Furthermore, in step S1), the heating temperature is 50-90℃.

[0014] Furthermore, in step S1), the mass fraction of the nitric acid is 40-98%.

[0015] Furthermore, in step S2), the concentration of the citric acid solution is 0.2-1.5 mol / L.

[0016] Furthermore, in step S2), the sum of the molar ratios of the citric acid and the metal ions in solution A and solution B is 2-6:1.

[0017] Furthermore, in step S2), the temperature of the heating and stirring mixture is 90-140℃.

[0018] Furthermore, in step S2), the drying temperature is 120-160℃; the drying time is 2-6 hours.

[0019] Furthermore, in step S3), the heating rate is 2-10℃ / min.

[0020] Furthermore, in step S3), the temperature of the heat preservation sintering is 800℃-1100℃.

[0021] Furthermore, in step S3), the heat preservation sintering time is 2-6 hours.

[0022] This invention provides a UV-excited tellurium-doped yttrium aluminum garnet phosphor prepared by any of the above-described methods, wherein the general formula of the compound of the UV-excited tellurium-doped yttrium aluminum garnet phosphor is Y. 3-x Al5O 12 :xTe 4+ (x = 0 to 0.04).

[0023] This invention provides the application of the above-mentioned ultraviolet-excited tellurium aluminum garnet phosphor in the preparation of ultraviolet chip-excited white LED devices and X-ray imaging devices.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] (1) Rare earth elements are not required as luminescent centers; instead, tellurium ions, which are low in toxicity and price, are used as luminescent ions.

[0026] (2) When effectively excited by ultraviolet light at 280nm, it has a broadband emission covering 350nm-600nm and a half width at half maximum (FWHM) of nearly 150nm, which can meet the needs of high-quality lighting.

[0027] (3) The preparation process of the present invention is simple, does not require harsh preparation conditions, and has a low synthesis temperature. It can be synthesized at around 1000℃ to obtain Te-doped YAG powder that cannot be prepared by solid method.

[0028] (4) Compared with the solid-state method, it can effectively avoid the volatilization of TeO2 at high temperature and synthesize pure Te-doped YAG at low temperature.

[0029] (5) The preparation process of this invention has low cost and is easy to scale up. Attached Figure Description

[0030] Figure 1 YAG:3%Te prepared at different synthesis temperatures according to the present invention 4+ XRD pattern of powder.

[0031] Figure 2 YAG: 3% Te 4+ SEM images of powder at different sintering temperatures.

[0032] Figure 3 YAG:3%Te prepared at different sintering temperatures 4+ The emission spectra of the powder under 280 nm excitation, (a) 800℃; (b) 800℃; (c) 800℃; (d) 800℃.

[0033] Figure 4 YAG:x%Te prepared at 900℃ with different doping concentrations 4+ XRD patterns of powders (x = 0, 1, 2, 3, 4 mol%).

[0034] Figure 5 YAG:x%Te prepared at 900℃ with different doping concentrations 4+ Fluorescence spectra of powders (x = 0, 1, 2, 3, 4 mol%). Detailed Implementation

[0035] The specific implementation of the present invention will be further described below with reference to the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that any processes not specifically described in detail below are those that can be implemented or understood by those skilled in the art by referring to the prior art. Reagents or instruments whose manufacturers are not specified are considered to be conventional products that can be purchased commercially.

[0036] Example 1

[0037] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+(x=0.03) Weigh Al(NO3)3·9H2O raw material into glass beaker A, and Y2O3 and TeO2 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 50℃. While stirring, add nitric acid with a concentration of 40% until the powder is completely dissolved.

[0038] S2) Weigh a certain amount of 0.2 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:2, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in cups A and B and heat on a heating stage to 90°C. Add the solution in cup C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 120°C for 2 hours.

[0039] S3) After the dried gel is ground evenly with an agate mortar, it is transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature is 800℃, the heating rate of the muffle furnace is set to 2℃ / min, and the holding time is set to 2h. After cooling to room temperature with the furnace, the sintered sample is taken out and ground thoroughly again with an agate mortar to obtain the desired product.

[0040] Example 2

[0041] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+ (x=0.03) Weigh Al(NO3)3·9H2O raw material into glass beaker A, and Y(NO3)3 and Te(NO3)4 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 90℃. While stirring, add nitric acid with a mass fraction of 98% until the powder is completely dissolved.

[0042] S2) Weigh out a 1.5 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:6, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in beakers A and B and heat on a heating stage to 140°C. Add the solution in beaker C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 160°C for 6 hours.

[0043] S3) After the dried gel was ground evenly with an agate mortar, it was transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature was 1100℃, the heating rate of the muffle furnace was set to 10℃ / min, and the holding time was set to 6h. After cooling to room temperature with the furnace, the sintered sample was taken out and ground thoroughly again with an agate mortar to obtain the desired product.

[0044] Example 3

[0045] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+ (x=0.03) Weigh Al(NO3)3 raw material into glass beaker A, and Y(NO3)3 and Te(NO3)4 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 65℃. While stirring, add nitric acid with a mass fraction of 60% until the powder is completely dissolved.

[0046] S2) Weigh out a 0.7 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:4, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in beakers A and B and heat on a heating stage to 120°C. Add the solution in beaker C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 140°C for 4 hours.

[0047] S3) After the dried gel was ground evenly using an agate mortar, it was transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature was 900℃, the heating rate of the muffle furnace was set to 5℃ / min, and the holding time was set to 4h. After cooling to room temperature in the furnace, the sintered sample was removed and ground thoroughly again using an agate mortar to obtain the desired product.

[0048] Example 4

[0049] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+(x=0.03) Weigh Al(NO3)3 raw material into glass beaker A, and Y(NO3)3 and Te(NO3)4 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 75℃. While stirring, add nitric acid with a mass fraction of 70% until the powder is completely dissolved.

[0050] S2) Weigh out 0.8 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:3, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in beakers A and B and heat on a heating stage to 110°C. Add the solution in beaker C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 150°C for 5 hours.

[0051] S3) After the dried gel is ground evenly with an agate mortar, it is transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature is 1000℃, the heating rate of the muffle furnace is set to 7℃ / min, and the holding time is set to 5h. After cooling to room temperature with the furnace, the sintered sample is taken out and ground thoroughly again with an agate mortar to obtain the desired product.

[0052] Figure 1 YAG:3%Te was synthesized at sintering temperatures of 800℃, 900℃, 1000℃ and 1100℃ respectively. 4+ XRD patterns of the samples. The diffraction peaks of all samples are related to Y3Al5O. 12 The results were consistent with the standard card (JCPDS: 88-2048), and no diffraction peaks were detected in the mesophases Y4Al2O9 (YAM) and YAlO3 (YAP). This means that the pure YAG phase was successfully prepared at 800℃ using the sol-gel method, which is much lower than the synthesis temperature required for the solid-state method (≥1500℃). Furthermore, no diffraction peaks were detected in TeO2, indicating that Te... 4+ Ions were successfully doped into the matrix. As can be observed from the figure, the diffraction intensity of the sample increases and the full width at half maximum (FWHM) of the diffraction peaks decreases with increasing sintering temperature, indicating that the crystallinity of the powder increases.

[0053] Figure 2 YAG:3%Te synthesized at different sintering temperatures 4+Microscopic morphology of the powder. All sample particles are nearly spherical in shape, with a generally uniform grain distribution. At 800℃, the average particle size of the powder is approximately 40 nm. With increasing sintering temperature, the grain size of the synthesized powder increases significantly, indicating that higher temperature promotes interparticle contact reactions to generate larger products. When the sintering temperature rises to 1100℃, the average particle size of the sample increases to approximately 90 nm.

[0054] Figure 3 YAG:3%Te prepared at different sintering temperatures 4+ The emission spectra of the powder under 280 nm excitation are shown in the figure. It is clear from the figure that all prepared samples exhibit a broad emission band with a central peak at 467 nm, and the bandwidth covers from 380 nm to 600 nm. According to reports, pure YAG powder itself does not emit blue light, which means that Te ions have been successfully doped into the YAG lattice and become luminescent centers. With increasing sintering temperature, the fluorescence emission intensity initially increases, reaching a maximum at 900 °C, and then significantly decreases with further increases in temperature. This may be due to the influence of crystal defects and crystallinity on the radiative transitions of the samples.

[0055] Example 5

[0056] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+ (x=0.01) Weigh Al(NO3)3·9H2O raw material into glass beaker A, and Y2O3 and TeO2 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 50℃. While stirring, add nitric acid with a concentration of 40% until the powder is completely dissolved.

[0057] S2) Weigh a certain amount of 0.2 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:2, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in cups A and B and heat on a heating stage to 90°C. Add the solution in cup C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 120°C for 2 hours.

[0058] S3) After the dried gel is ground evenly with an agate mortar, it is transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature is 900℃, the heating rate of the muffle furnace is set to 2℃ / min, and the holding time is set to 2h. After cooling to room temperature with the furnace, the sintered sample is taken out and ground thoroughly again with an agate mortar to obtain the desired product.

[0059] Example 6

[0060] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+ (x=0.02) Weigh Al(NO3)3·9H2O raw material into glass beaker A, and Y(NO3)3 and Te(NO3)4 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 90℃. While stirring, add nitric acid with a mass fraction of 98% until the powder is completely dissolved.

[0061] S2) Weigh out a 1.5 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:6, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in beakers A and B and heat on a heating stage to 140°C. Add the solution in beaker C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 160°C for 6 hours.

[0062] S3) After the dried gel is ground evenly with an agate mortar, it is transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature is 900℃, the heating rate of the muffle furnace is set to 10℃ / min, and the holding time is set to 6h. After cooling to room temperature with the furnace, the sintered sample is taken out and ground thoroughly again with an agate mortar to obtain the desired product.

[0063] Example 7

[0064] S1) Use the analytical balance according to Y 3-x Al5O 12 :xTe 4+(x=0.04) Weigh Al(NO3)3 raw material into glass beaker A, and Y(NO3)3 and Te(NO3)4 raw materials into beaker B. Add an appropriate amount of deionized water to beaker A and stir with a glass rod until dissolved. Add a small amount of water to beaker B and place it on a heating platform to heat at 65℃. While stirring, add nitric acid with a mass fraction of 60% until the powder is completely dissolved.

[0065] S2) Weigh out a 0.7 mol / L citric acid solution according to a cation-to-citric acid molar ratio of 1:4, add an appropriate amount of deionized water and stir with a glass rod until dissolved to form solution C. Mix the solutions in beakers A and B and heat on a heating stage to 120°C. Add the solution in beaker C dropwise to the mixture of A and B using a dropper. After a period of time, the solution changes from transparent to yellow, accompanied by a large amount of yellow gas being emitted. Continue until the magnetic stirrer stops. Turn off the heating stage and remove the magnetic stirrer. After the wet gel cools to room temperature, transfer it to a drying oven and dry at 140°C for 4 hours.

[0066] S3) After the dried gel was ground evenly using an agate mortar, it was transferred to a corundum crucible and sintered in a muffle furnace according to the set reaction temperature, heating rate, and holding time. The holding sintering temperature was 900℃, the heating rate of the muffle furnace was set to 5℃ / min, and the holding time was set to 4h. After cooling to room temperature in the furnace, the sintered sample was removed and ground thoroughly again using an agate mortar to obtain the desired product.

[0067] Figure 4 It is YAG:xTe doped with different concentrations 4+ XRD patterns of powders (x = 0, 1, 2, 3, 4 mol%). The figures show that all samples exhibit good peak position matching with the standard YAG card (PDF#88-2048), with no other impurities present. The diffraction peak intensity did not change significantly with increasing doping concentration, indicating that Te at this temperature... 4+ The doping has little effect on the phase structure of YAG.

[0068] Figure 5 YAG:xTe with different doping concentrations 4+ (x = 0, 1, 2, 3, 4 mol%) Powder fluorescence spectra, with ae representing the sample curves for doping concentrations of 0-4 mol%. The figures show that at an excitation wavelength of 280 nm, the undoped sample exhibits no fluorescence emission, while all doped samples display a broad spectrum with a central peak at 467 nm, indicating that Te has successfully doped into lattice sites and become the luminescent center. With increasing doping concentration, YAG:xTe... 4+The emission intensity initially increases and then decreases, reaching its maximum at x = 2%. This is because increasing the initial doping concentration increases the number of luminescent centers, thus increasing the fluorescence emission intensity. However, with further increases in doping concentration, the distance between luminescent centers decreases, and the energy transfer rate increases. When Te... 4+ When the ion fluorescence emission efficiency is lower than the energy transfer efficiency, Te... 4+ Energy conversion occurs before energy is emitted, exhibiting a concentration quenching effect.

[0069] The above embodiments are merely preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any changes, substitutions, modifications, etc., made by those skilled in the art without departing from the spirit and essence of the present invention should be within the protection scope of the present invention.

Claims

1. A method for preparing ultraviolet-excited tellurium-doped yttrium aluminum garnet phosphor, characterized in that, Includes the following steps: S1) Weigh out aluminum salt and dissolve it in water, denoted as solution A; weigh out yttrium salt or Y₂O₃, tellurium salt or TeO₂, add water and heat while stirring, adding nitric acid while stirring until all the powder is dissolved, denoted as solution B; the molar ratio of aluminum, yttrium, and tellurium in the aluminum salt, yttrium salt or Y₂O₃, tellurium salt or TeO₂ is 5:3-x:x, where 0 < x ≤ 0.04; the aluminum salt includes one or more of Al(NO₃)₃·9H₂O and AlCl₃; the yttrium salt includes one or more of Y(NO₃)₃ and Y(NO₃)₃·6H₂O; the tellurium salt includes one or more of Te(NO₃)₄ and TeCl₄; the heating temperature is 50-90 ℃; the mass fraction of the nitric acid is 40-98%; S2) Heat and stir solutions A and B together, then add citric acid solution dropwise until the solution changes from transparent to yellow, accompanied by the emission of a large amount of yellow gas, to obtain a wet gel. After cooling to room temperature, dry the wet gel to obtain a dry gel. The concentration of the citric acid solution is 0.2-1.5 mol / L; the sum of the molar ratios of citric acid and metal ions in solutions A and B is 2-6:1; the heating and stirring temperature is 90-140℃; the drying temperature is 120-160℃; and the drying time is 2-6 hours. S3) The dry gel is ground and then heated and sintered to obtain UV-excited tellurium aluminum garnet phosphor; the heating rate is 2-10℃ / min; the sintering temperature is 800℃-1100℃; and the sintering time is 2-6h.

2. A UV-excited tellurium-doped yttrium aluminum garnet phosphor prepared by the method of claim 1, characterized in that, The general formula of the ultraviolet-excited tellurium-doped yttrium aluminum garnet phosphor is Y. 3-x Al5O 12 : x Te 4+ , where 0 < x ≤ 0.

04.

3. The application of the ultraviolet-excited tellurium-doped yttrium aluminum garnet phosphor as described in claim 2 in the preparation of ultraviolet chip-excited white LED devices and X-ray imaging devices.

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