Ultraviolet-excited green light-emitting fluorescent material, and preparation method and application thereof

Abstract

The application relates to an ultraviolet-excited green light-emitting fluorescent material and a preparation method and application thereof, and the ultraviolet-excited green light-emitting fluorescent material is Ce 3+ The application relates to an ultraviolet-excited green light-emitting fluorescent material and a preparation method and application thereof, and the ultraviolet-excited green light-emitting fluorescent material is Ce 1‑x (PO4)5(SiO4)F2:xCe 3+ Wherein, 0.02<=x<=0.1. Compared with the prior art, the ultraviolet-excited green fluorescent material provided by the application has an excitation spectrum covering 200-380 nm, and the optimal excitation wavelength is located at 307 nm; under the excitation of ultraviolet light at the optimal excitation wavelength, the fluorescent material can emit green light with a light-emitting wavelength of 350-700 nm and a central wavelength of 543 nm. Meanwhile, the fluorescent material has excellent luminous efficiency and good thermal stability, and the internal quantum efficiency can reach 54%; at 150 DEG C, the luminous intensity is 80% of that at room temperature. The fluorescent powder can be well matched with the existing ultraviolet chip, meets the commercial market demand, and is suitable for applications of white light LED, sunlight-like LED, full-spectrum LED and the like.

Description

Technical Field

[0001] This invention relates to the field of phosphor preparation technology, and in particular to a green light emitting fluorescent material excited by ultraviolet light, its preparation method and application. Background Technology

[0002] With scientific advancements and improved living standards, people are paying more attention to the quality of lighting. Currently used lighting fixtures such as incandescent lamps and fluorescent lamps have significant drawbacks. White LEDs, on the other hand, combine advantages such as small size, fast response, long lifespan, low energy consumption, and environmental friendliness, making them the mainstream lighting method. There are currently two main ways to achieve white LEDs. One method uses multi-color chips, but this method is not ideal due to its high cost, complex activation circuitry, and inability to produce a uniformly distributed spectrum. The other method uses a single chip with phosphor. This method is low-cost, offers a wide adjustable color temperature range, a high color rendering index, and can achieve a continuous spectrum similar to sunlight, making it the most widely used method for white LED applications. Therefore, we need to find high-quality phosphors suitable for sunlight-like lighting that are matched to the excitation and emission of the chip.

[0003] Oxide phosphors possess advantages such as superior optical properties, rigid structure, stable performance, ease of preparation, and low cost. Fluorides exhibit advantages such as low internal vibration, extremely high electronegativity, large Stokes shift, and strong ionic compatibility. Fluorooxide-based phosphors combine the advantages of both oxides and fluorides. Based on this, oxyfluoride phosphors were designed and synthesized, exhibiting both activation ion-oxygen and activation ion-fluorine bonding, forming a unique hybrid coordination structure. Compared to individual oxide or fluoride structures, this structure is distorted, exhibiting a certain degree of twisting, decreased symmetry, and altered crystal environment, resulting in different amplitudes, lower phonon energy, increased non-thermal radiation probability, and significantly increased luminescence potential. This approach retains the inherent advantages of oxide and fluoride phosphors while possessing its own unique properties, enriching the phosphor material matrix system and broadening its application fields.

[0004] Xia et al. successfully synthesized a novel apatite-type green phosphor, Ca6La4(SiO4)2(PO4)4O2:Eu 2+ When excited by 365nm ultraviolet light, it emits green light with a center wavelength of 500nm. Its internal quantum efficiency is 57.73%, but at 150℃, the luminescence intensity of this phosphor is only 55% of that at room temperature, and its stability needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a UV-excited green light emitting fluorescent material, its preparation method and application, which has excellent luminescence efficiency and good thermal stability.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] One objective of this invention is to provide a UV-excited green-emitting fluorescent material, wherein the UV-excited green-emitting fluorescent material is Ce. 3+ A green-emitting fluorescent material doped with fluorine oxides, its chemical formula is Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ , where 0.02≤x≤0.1.

[0008] Preferably, x = 0.02, 0.04, 0.06 or 0.08.

[0009] Preferably, the excitation spectrum of the ultraviolet-excited green-emitting fluorescent material covers 200–380 nm, with the optimal excitation wavelength at 307 nm. Under the excitation of ultraviolet light at the optimal excitation wavelength, the fluorescent material emits green light with a emission wavelength range of 350–700 nm and a center wavelength at 543 nm.

[0010] Preferably, the ultraviolet-excited green fluorescent material is a powder.

[0011] The second objective of this invention is to provide a method for preparing the ultraviolet-excited green-emitting fluorescent material, comprising the following steps:

[0012] S1. Weigh the calcium source compound, terbium source compound, phosphorus source compound, silicon source compound, cerium source compound, and fluorine source compound raw material powders according to the stoichiometric ratio, grind and mix them evenly to obtain a mixture;

[0013] S2. The mixture is sintered at high temperature and cooled to obtain the ultraviolet-excited green fluorescent material.

[0014] Preferably, in step S1, the calcium source compound includes CaCO3, the terbium source compound includes Tb4O7, the phosphorus source compound includes (NH4)2HPO4, the silicon source compound includes SiO2, the cerium source compound includes CeO2, and the fluorine source compound includes NH4F; the grinding time is 5 to 120 minutes.

[0015] Preferably, in step S1, the green light emitting fluorescent material is prepared according to the chemical formula Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ In this case, 0.02≤x≤0.1, based on the preparation of each raw material, an additional 5-15% of fluorine source compound is added as a fluorine source supplement based on the calculated amount of fluorine source compound.

[0016] More preferably, in step S1, the green light emitting fluorescent material is prepared according to the chemical formula Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ Where 0.02≤x≤0.1, on the basis of preparing each raw material, an additional 10% of fluorine source compound is added as a fluorine source supplement based on the calculated amount of fluorine source compound.

[0017] This invention uses a fluorine source compound in the sintering process. The synthesis temperature of the reaction does not exceed 1450℃. However, if the raw materials used in the experiment contain a large amount of fluorine source compound and are directly sintered at this high temperature, some fluorine will be lost in gaseous form, resulting in the generation of impurities during the production process. Therefore, it is necessary to add a certain amount of fluorine source compound as a fluorine source supplement. Furthermore, the type and temperature of the fluorine source supplement in this system will affect the luminescence intensity and phase composition of the sample.

[0018] Preferably, in step S2, the conditions for high-temperature sintering are: vacuuming, maintaining a reducing atmosphere, and sintering at 900–1450°C for 2–24 hours.

[0019] More preferably, in step S2, the conditions for high-temperature sintering are: vacuuming, maintaining a reducing atmosphere, and sintering at 900–1450°C for 2–12 hours.

[0020] More preferably, in step S2, the high-temperature sintering temperature is 1300–1450°C.

[0021] More preferably, in step S2, the high-temperature sintering time is 12 hours.

[0022] More preferably, in step S2, the system pressure is maintained at 0 MPa during the high-temperature sintering.

[0023] More preferably, in step S2, the reducing atmosphere refers to a mixture of 5% H2 and 95% N2 by volume.

[0024] More preferably, in step S2, the high-temperature sintering method is as follows: the mixture obtained in step S1 is loaded into an alumina crucible, and then the alumina crucible containing the mixture is placed in a reducing atmosphere for sintering.

[0025] More preferably, in step S2, the cooling refers to cooling to room temperature.

[0026] The third objective of this invention is to provide an application of the ultraviolet-excited green emitting fluorescent material, characterized in that the ultraviolet-excited green emitting fluorescent material is used to prepare full-spectrum white LEDs (WLEDs).

[0027] Preferably, the ultraviolet-excited green emitting fluorescent material is used in fields such as white LEDs, solar-like LEDs, full-spectrum LEDs, optical anti-counterfeiting, and optical temperature measurement.

[0028] In phosphor systems, apatite is an important oxide matrix material for LED phosphors, with the general formula A5(BO4)3C, where A and B can be substituted by various cations. Due to its good stability and excellent physicochemical properties, superior luminescence properties can be achieved through chemical ion substitution and rare earth ion doping. Therefore, the apatite structure system is a very promising phosphor material.

[0029] This invention uses Ce 3+ As a luminescent center, Ce can be used to modulate the crystal field environment by changing the concentration of activating ions. 3+ The 5d electrons are located in the outer shell, and their df transitions are easily affected by the crystal field environment. Their spectra can change significantly with the composition and structure of the matrix material.

[0030] This invention uses an apatite-structured Ca9Tb(PO4)5(SiO4)F2 as a matrix, in which Ce is incorporated. 3+ This provides a novel, previously unreported method for UV-excited Ce2. 3+ A fluorine oxide-based 543nm green-emitting fluorescent material is described, wherein the phosphor has an effective absorption range covering 200–380 nm and an optimal excitation wavelength of 307 nm. The phosphor exhibits good thermal stability, with its luminescence intensity at 423 K being 80% of that at 303 K. In this invention, Ce... 3+ With Tb 3+ Energy transfer exists, Ce 3+ Transfer energy to Tb 3+ Mainly composed of Tb 3+ To emit light, and with Ce 3+ With the increase of Tb concentration 3+ The luminous intensity increases dramatically. This invention exhibits excellent luminous efficiency while also possessing good thermal stability. The phosphor of this invention can be prepared using a conventional solid-state reaction method, featuring a simple preparation process and ease of industrial production, making it a promising candidate material for the widespread application of full-spectrum white LEDs. It is suitable for applications such as white LEDs, solar-like LEDs, full-spectrum LEDs, optical anti-counterfeiting, and optical temperature measurement.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) This invention provides a Ce 3+The doped fluorine oxide green light-emitting fluorescent material has a wide excitation band and an effective absorption range covering 200–380 nm. The resulting phosphor can emit green light with a center wavelength of 543 nm under 307 nm ultraviolet light excitation, exhibiting excellent luminous efficiency while also possessing good thermal stability.

[0033] (2) The fluorescent material of this invention is Ce 3+ Doped apatite-structured green emitting phosphor, by using Ce 3+ Green light emission is obtained by ion doping in the apatite structure, Ce 3+ With Tb 3+ There is energy transfer between them, and they have the advantages of good luminescence performance and stable physicochemical properties. The IQE (internal quantum efficiency) can reach 54%, and the EQE (external quantum efficiency) can reach 34%.

[0034] (3) The Ca9Tb of the present invention 1-x (PO4)5(SiO4)F2:xCe 3+ The quantum efficiency of the phosphor is close to that of Ca6La4(SiO4)2(PO4)4O2:Eu 2+ (57.73%), while exhibiting significantly better thermal stability than Ca6La4(SiO4)2(PO4)4O2:Eu 2+ At 150°C, its luminescence intensity is 80% of that at room temperature.

[0035] (4) The fluorescent material of the present invention is temperature sensitive. At 544 nm and 423 K, the luminescence intensity is 80% of that of 303 K, and at 380 nm and 423 K, the luminescence intensity is 68.56% of that of 303 K, which can be used for temperature measurement.

[0036] (5) The fluorescent material of the present invention is prepared by conventional solid-state reaction method. It has the characteristics of simple preparation process and industrial production. It can be used as a good candidate material for the wide application of white full-spectrum LED and has a wide application prospect. Attached Figure Description

[0037] Figure 1 The image shows the photoemission spectra of the ultraviolet-excited green phosphors prepared in Examples 1-5 of this invention.

[0038] Figure 2 The images show the photoemission spectra at different temperatures in Embodiment 4 of the present invention.

[0039] Figure 3 This is a graph showing the luminescence thermal stability of Embodiment 4 of the present invention. Detailed Implementation

[0040] This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiment.

[0041] Unless otherwise specified, the reagents, methods, instruments, and equipment used in this invention are conventional in the art. Unless otherwise specified, the reagents and materials used in the following examples are all commercially available.

[0042] A UV-excited green-emitting fluorescent material, wherein the UV-excited green-emitting fluorescent material is Ce. 3+ A green-emitting fluorescent material doped with fluorine oxides, its chemical formula is Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ Wherein, 0.02≤x≤0.1. The excitation spectrum of the ultraviolet-excited green-emitting fluorescent material covers 200–380 nm, with the optimal excitation wavelength at 307 nm. Under the excitation of ultraviolet light at the optimal excitation wavelength, the fluorescent material emits green light with a emission wavelength range of 350–700 nm and a center wavelength at 543 nm.

[0043] Its preparation method is as follows:

[0044] S1. Weigh the calcium source compound, terbium source compound, phosphorus source compound, silicon source compound, cerium source compound, and fluorine source compound raw material powders according to the stoichiometric ratio, grind and mix them evenly to obtain a mixture;

[0045] S2. The mixture is sintered at high temperature and cooled to obtain the ultraviolet-excited green fluorescent material.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0047] Example 1:

[0048] This embodiment provides a green light emitting fluorescent material excited by ultraviolet light, and the preparation steps are as follows:

[0049] 1. Weigh 1g of raw material powders of CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F according to the stoichiometric ratio (the mass ratio of each raw material is CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F = 0.4787:0.0319:0.3508:0.09730.0018:0.0394).

[0050] 2. Place the above raw material mixture in an agate mortar and grind for 30 to 60 minutes. After the material is evenly mixed, load the mixture into an alumina crucible and calcine it at 1430°C for 8 hours in a reducing atmosphere of hydrogen and nitrogen. Then cool it to room temperature to obtain the target product.

[0051] 3. Use a fluorescence spectrometer to test the spectral properties of the phosphor in this system, such as... Figure 1 As shown in the figure. The results indicate that the phosphor in this system has a broad excitation band with a peak value near 307 nm and a high spectral peak value, which can be well matched with commercial ultraviolet light chips. Under excitation by a 307 nm ultraviolet light source, the phosphor emits bright green light with an emission spectral peak value at 543 nm.

[0052] The ultraviolet-excited Ce obtained in this embodiment 3+ Ca9Tb doped with green emitting phosphor 1-x (PO4)5(SiO4)F2:xCe 3+ Where x = 0.02.

[0053] Example 2:

[0054] This embodiment provides a green light emitting fluorescent material excited by ultraviolet light, and the preparation steps are as follows:

[0055] 1. Weigh 1g of raw material powders of CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F according to the stoichiometric ratio (the mass ratio of each raw material is CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F = 0.4787:0.0319:0.3509:0.09530.0037:0.0394).

[0056] 2. Place the above raw material mixture in an agate mortar and grind for 30 to 60 minutes. After the material is evenly mixed, load the mixture into an alumina crucible and calcine it at 1430°C for 8 hours in a reducing atmosphere of hydrogen and nitrogen. Then cool it to room temperature to obtain the target product.

[0057] 3. Use a fluorescence spectrometer to test the spectral properties of the phosphor in this system, such as... Figure 1 As shown in the figure. The results indicate that the phosphor in this system has a broad excitation band with a peak value near 307 nm and a high spectral peak value, which can be well matched with commercial ultraviolet light chips. Under excitation by a 307 nm ultraviolet light source, the phosphor emits bright green light with an emission spectral peak value at 543 nm.

[0058] The ultraviolet-excited Ce obtained in this embodiment 3+ The general formula for doped green emitting phosphors is Ca9Tb. 1-x(PO4)5(SiO4)F2:xCe 3+ Where x = 0.04.

[0059] Example 3:

[0060] This embodiment provides a green light emitting fluorescent material excited by ultraviolet light, and the preparation steps are as follows:

[0061] 1. Weigh 1g of raw material powders of CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F according to the stoichiometric ratio (the mass ratio of each raw material is CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F = 0.4788:0.0319:0.3508:0.09340.0055:0.0394).

[0062] 2. Place the above raw material mixture in an agate mortar and grind for 30 to 60 minutes. After the material is evenly mixed, load the mixture into an alumina crucible and calcine it at 1430°C for 8 hours in a reducing atmosphere of hydrogen and nitrogen. Then cool it to room temperature to obtain the target product.

[0063] 3. Use a fluorescence spectrometer to test the spectral properties of the phosphor in this system, such as... Figure 1 As shown in the figure. The results indicate that the phosphor in this system has a broad excitation band with a peak value near 307 nm and a high spectral peak value, which can be well matched with commercial ultraviolet light chips. Under excitation by a 307 nm ultraviolet light source, the phosphor emits bright green light with an emission spectral peak value at 543 nm.

[0064] The ultraviolet-excited Ce obtained in this embodiment 3+ The general formula for doped green emitting phosphors is Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ Where x = 0.06.

[0065] Example 4:

[0066] This embodiment provides a green light emitting fluorescent material excited by ultraviolet light, and the preparation steps are as follows:

[0067] 1. Weigh 1g of raw material powders of CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F according to the stoichiometric ratio (the mass ratio of each raw material is CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F = 0.4789:0.0319:0.3510:0.09140.0073:0.0394).

[0068] 2. Place the above raw material mixture in an agate mortar and grind for 30 to 60 minutes. After the material is evenly mixed, load the mixture into an alumina crucible and calcine it at 1430°C for 8 hours in a reducing atmosphere of hydrogen and nitrogen. Then cool it to room temperature to obtain the target product.

[0069] 3. Use a fluorescence spectrometer to test the spectral properties of the phosphor in this system, such as... Figure 1 As shown in the figure. The results indicate that the phosphor in this system has a broad excitation band with a peak value near 307 nm and a high spectral peak value, which can be well matched with commercial ultraviolet light chips. Under excitation by a 307 nm ultraviolet light source, the phosphor emits bright green light with an emission spectral peak value at 543 nm.

[0070] The ultraviolet-excited Ce obtained in this embodiment 3+ The general formula for doped green emitting phosphors is Ca9Tb. 1-x (PO4)5(SiO4)F2:xCe 3+ Where x = 0.08.

[0071] Example 5:

[0072] This embodiment provides a green light emitting fluorescent material excited by ultraviolet light, and the preparation steps are as follows:

[0073] 1. Weigh 1g of raw material powders of CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F according to the stoichiometric ratio (the mass ratio of each raw material is CaCO3, SiO2, (NH4)2HPO4, Tb4O7, CeO2, and NH4F = 0.4788:0.0319:0.3510:0.08950.0092:0.0394).

[0074] 2. Place the above raw material mixture in an agate mortar and grind for 30 to 60 minutes. After the material is evenly mixed, load the mixture into an alumina crucible and calcine it at 1430°C for 8 hours in a reducing atmosphere of hydrogen and nitrogen. Then cool it to room temperature to obtain the target product.

[0075] 3. Use a fluorescence spectrometer to test the spectral properties of the phosphor in this system, such as... Figure 1 As shown in the figure. The results indicate that the phosphor in this system has a broad excitation band with a peak value near 307 nm and a high spectral peak value, which can be well matched with commercial ultraviolet light chips. Under excitation by a 307 nm ultraviolet light source, the phosphor emits bright green light with an emission spectral peak value at 543 nm.

[0076] The ultraviolet-excited Ce obtained in this embodiment 3+ The general formula for doped green emitting phosphors is Ca9Tb. 1-x(PO4)5(SiO4)F2:xCe 3+ Where x = 0.1.

[0077] Table 1. Preparation process and performance test results of Examples 1-5

[0078]

[0079]

[0080] The quantum efficiency of the green emitting phosphor prepared in Example 4 was calculated. For direct excitation, the internal quantum efficiency was 0.648, the absorptivity was 0.632, and the external quantum efficiency was 0.41. For indirect excitation, the internal quantum efficiency was 0.3, the absorptivity was 0.62, and the external quantum efficiency was 0.186. According to the formula... ( For the quantum efficiency of direct excitation, A d The absorption rate during direct excitation. (For indirect excitation quantum efficiency), the internal quantum efficiency IQE = 0.648 - (1 - 0.632) * 0.3 = 54%, and the external quantum efficiency EQE = 0.41 - (1 - 0.632) * 0.186 = 34%.

[0081] The stability of the green emitting phosphor prepared in Example 4 was tested, such as... Figure 2-3 As shown, the blue phosphor prepared in Example 4 has stable chemical properties, with the 543 nm region being composed of Tb. 3+ The resulting emission peak still maintains approximately 80.28% of its initial intensity at room temperature at 150℃ (423K).

[0082] In summary, this invention yields a novel UV-excited Ce 3+ The doped fluorine oxide green light-emitting fluorescent material has excellent luminous efficiency and good thermal stability. Its excitation spectrum covers 200-380nm, with the optimal excitation wavelength at 307nm. Under the excitation of ultraviolet light at this optimal excitation wavelength, the fluorescent material can emit green light with a emission wavelength of 350-700nm and a center wavelength of 543nm. It can be matched with existing ultraviolet chips and is a good candidate material for the widespread application of next-generation full-spectrum white LEDs.

[0083] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A green light-emitting fluorescent material excited by ultraviolet light, characterized in that, The green light emitting fluorescent material excited by ultraviolet is Ce 3+ A doped oxyfluoride green light emitting fluorescent material having a chemical formula of Ca9Tb 1-x (PO4)5(SiO4)F2:xCe 3 + wherein 0.02≤x≤0.

1.

2. An ultraviolet-excited green-emitting phosphor according to claim 1, characterized in that x=0.02, 0.04, 0.06 or 0.

08.

3. The ultraviolet-excited green-emitting phosphor of claim 1, wherein, The excitation spectrum of the ultraviolet-excited green light emitting fluorescent material covers 200-380 nm, and the optimal excitation wavelength is located at 307 nm; under the excitation of ultraviolet light at the optimal excitation wavelength, the fluorescent material emits green light with a light emission wavelength range of 350-700 nm and a central wavelength of 543 nm.

4. The ultraviolet-excited green-emitting phosphor of claim 1, wherein, The ultraviolet-excited green fluorescent material is a powdery material.

5. A process for the preparation of an ultraviolet-excited green-emitting fluorescent material as claimed in any one of claims 1 to 4, characterized in that The method comprises the following steps: S1, according to a metering ratio, calcium source compound, terbium source compound, phosphorus source compound, silicon source compound, cerium source compound and fluorine source compound are weighed and mixed uniformly to obtain a mixture; S2, the mixture is sintered at high temperature to obtain the ultraviolet-excited green fluorescent material.

6. The method of claim 5, wherein the method further comprises the step of: 5 heating the mixture to a temperature of about 500°C to about 600°C. 0 In step S1, the calcium source compound comprises CaCO3, the terbium source compound comprises Tb4O7, the phosphorus source compound comprises (NH4)2HPO4, the silicon source compound comprises SiO2, the cerium source compound comprises CeO2, and the fluorine source compound comprises NH4F; the grinding time is 5-120 min.

7. The method for preparing a UV-excited green-emitting fluorescent material according to claim 5, characterized in that, In step S1, the green light emitting phosphor has a chemical formula of Ca9Tb 1-x (PO4)5(SiO4)F2:xCe 3+ wherein 0.02≤x≤0.1, and on the basis of the preparation of each raw material, 5-15% of the fluorine source compound is additionally added as a fluorine source supplement on the basis of the calculated amount of the fluorine source compound.

8. The method for preparing a UV-excited green-emitting fluorescent material according to claim 5, characterized in that, In step S2, the high-temperature sintering condition is: vacuumizing, maintaining a reducing atmosphere, sintering at 900-1450 ℃ for 2-24 hours.

9. A method of producing an ultraviolet-excited green light emitting phosphor according to claim 8, characterized by, The reducing atmosphere refers to a mixed gas of 5% H2 and 95% N2 by volume.

10. Use of an ultraviolet-excited green-emitting fluorescent material as claimed in any one of claims 1-4, characterized in that The ultraviolet-excited green light emitting fluorescent material is used for preparing a full-spectrum white light LED.

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