Luminescent material capable of emitting dark green light-red light, preparation method and LED light source prepared from luminescent material

Abstract

The invention discloses a dark green light-red light composite ultra-wideband luminescent material, a preparation method thereof and an LED light source containing the luminescent material. The chemical formula of the luminescent material is (A8-xEux) (Mg1-yMny) B (PO4) 7, wherein A is one or a combination of Sr and Ba alkaline earth metals; b is one or a combination of La, Y, Sc, Gd, Ga, In and Al trivalent metal ions; eu < 2 + > and Mn < 2 + > are luminescent central ions, and the specific doping amount is 0 lt; x is less than or equal to 20%, 0 lt; y < = 20%. The powder material is prepared by adopting a high-temperature solid-phase method, and the method is simple in process, environment-friendly and low in cost. The luminescent material provided by the invention can realize ultra-wideband coverage of green light-red light in a single matrix, can effectively supplement green light gullies in a full spectrum and reduce the use of other commercial powder, can be used as a fluorescence conversion material, and has a huge application prospect in the fields of full-spectrum illumination and high-power laser illumination.

Description

Technical Field

[0001] The invention relates to the technical field of solid-state lighting of rare earth doped inorganic solid luminescent materials, and in particular to an ultra-wideband emitting luminescent material of cyan-red light composite under the excitation of a purple light chip, a preparation method and an LED light source containing the material. Background Art

[0002] As a type of electric light source among artificial light sources, LED has become the fourth generation of new lighting source - solid-state cold light source - due to its compact structure, light weight, small size, low energy consumption, fast response speed, good shock resistance and easy use.

[0003] Rare earth luminescent materials are an indispensable part of supporting and leading the new generation of lighting and display devices. High-end full-spectrum and high-power lighting, high-quality wide color gamut display and non-visible light special light sources have put forward higher and new requirements for rare earth solid luminescent materials. At present, the existing lighting technology is a defective pseudo-full spectrum. Its defects are mainly reflected in the lack of cyan band (480-520nm) at the technical level, which makes it difficult to further improve the color rendering index. In addition, its defects are in practical applications. Because most of the existing white light LEDs use 450-465nm blue light chips to excite phosphors, there are more blue light emitted by blue light LED chips and not converted in the emission spectrum, which is easy to cause blue light hazards. On the other hand, the full spectrum standard includes two aspects: (1) the spectral intensity ratio of different wavelengths should be uniform; (2) the spectrum should have a specific coverage range (400-700nm). Therefore, choosing a 450-465nm blue light chip to excite phosphors will lack the 400-450nm spectrum.

[0004] In order to overcome the above defects, researchers proposed to use near-ultraviolet (λ em =365-395nm) LED chips are used to excite three-color (red, green and blue) phosphors. However, this combination also has some problems. For example, the luminous efficiency of the UV chip is low, about 44%, and the UV light can easily accelerate the aging of the LED packaging resin, resulting in a significant reduction in the service life of the light source. However, the UV light (λ em =395-420nm) LED chips have become the best excitation light source for full-spectrum LEDs due to their high luminous efficiency (~80%) and good spectral coverage.

[0005] At present, most full-spectrum LEDs use a combination of multiple light-color powders to obtain white light materials with high color rendering index, but there are still many problems. On the one hand, self-absorption occurs between the powders, thus affecting the light efficiency; on the other hand, commercial yellow phosphors (YAG:Ce 3+)'s optimal excitation wave segment in the blue light region cannot match the purple light chip well. Therefore, it is particularly important to find an ultra-wideband fluorescent material that is a composite of cyan-red light and pumped by a purple light chip.

[0006] Eu 2+ The luminescence involves the parity-allowed 5d-4f transition, with strong luminescence and high quantum efficiency. It is an excellent activated ion that can realize the blue-cyan-green light band and is controllable. 2+ The luminescence involves a parity-forbidden dd transition, so the sensitizer Eu is present. 2+ Under the conditions of , its excitation range can be expanded, and it shows red light emission in a high coordination environment, which can greatly improve the color rendering index of the material and has high practical value.

[0007] Phosphates have a relatively low synthesis temperature and are relatively easy to prepare. They also have good chemical stability and are often used as a matrix for luminescent materials. 2+ , Mn 2+ Both can realize doping of rare earth / transition group ion luminescent materials in phosphate systems.

[0008] To this end, the present invention uses phosphate material as a matrix to prepare Eu 2+ , Mn 2+ The co-doped cyan-red composite ultra-wideband fluorescent material, when combined with a purple LED chip, can achieve tunable full-spectrum emission with high color rendering index, high luminous efficiency, and high thermal stability. Summary of the invention

[0009] The purpose of the present invention is to provide a cyan-red composite ultra-wideband luminescent material, a preparation method and an LED light source containing the material, aiming to solve the problems of low color rendering index, lack of cyan light, and blue light hazards of existing white light LEDs.

[0010] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0011] The present invention provides a cyan-red composite ultra-broadband luminescent material, the chemical formula of the luminescent material is (A 8-x Eu x )(Mg 1-y Mn y )B(PO4)7, where:

[0012] A is one of Sr and Ba alkaline earth metals or a combination thereof;

[0013] B is one of the trivalent metal ions of La, Y, Sc, Gd, Ga, In, and Al, or a combination thereof;

[0014] According to an embodiment of the present invention, the luminescent material is characterized in that: <x≤20%,0<y≤20%。

[0015] According to an embodiment of the present invention, the luminescent material is characterized in that it can be excited by a 365-420nm near-ultraviolet light / purple light chip to emit tunable cyan-red light, covering a spectral range of 470-750nm.

[0016] According to an embodiment of the present invention, the chemical composition of the luminescent material may be: Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 La(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 La(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Sc(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Sc(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Y(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Y(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Gd(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Gd(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Al(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Al(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 In(PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn0.01 In(PO4)7、Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Ga((PO4)7、Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Ga((PO4)7.

[0017] According to the embodiment of the present invention, the luminescent material has a high luminescent quantum yield and luminescent stability, and can simultaneously compound the emission of cyan-green light-red light and other bands, and has great application potential in the field of full-spectrum lighting and high-power laser lighting.

[0018] According to another aspect of the present application, a method for preparing a luminescent material is provided, which has the advantages of simple process and low production cost.

[0019] The present invention also provides a method for preparing the luminescent material, the method comprising the following steps:

[0020] (1) According to the chemical formula of the material (A 8-x Eu x )(Mg 1-y Mn y )B(PO4)7 stoichiometric ratio, weigh the compound raw materials and additives of each element, add grinding media and grind thoroughly;

[0021] (2) placing the obtained mixture into a corundum crucible, placing it in an oven for pre-sintering, cooling it naturally to room temperature after the pre-sintering is completed, grinding the obtained pre-sintered product, and then placing it in a tubular furnace for calcining in a protective atmosphere, and cooling it to room temperature with the furnace after the sintering is completed;

[0022] (3) After the sintered product obtained above is fully ground, cleaned and sieved, the target material can be obtained.

[0023] Optionally, the auxiliary agent described in step 1 may be selected from: NaCl, Na2O, LiCl, Li2CO3, H3BO3, Si3N4, Gd2O3, SrF2, MgF2, BaF2;

[0024] Optionally, the grinding medium described in step 1 may be: methanol, ethanol, ultrapure water;

[0025] Optionally, the grinding time in step 1 can be selected as: 20-120 min;

[0026] Optionally, the protective gas in step 2 may be high-purity nitrogen or a nitrogen / hydrogen mixture (volume ratio 90% / 10%);

[0027] Optionally, the pre-burning temperature in step 2 may be 200-300° C., and the holding time may be 1-8 hours;

[0028] Optionally, the calcination temperature in step 2 may be 1200-1400° C., and the holding time may be 2-24 hours.

[0029] The present invention also provides an LED light source comprising the luminescent material, comprising an excitation light source and a luminescent material that can be excited by the excitation light source, wherein the luminescent material includes the cyan-red light emitting composite fluorescent material of the present invention.

[0030] According to an embodiment of the present invention, the wavelength range of the excitation light source is in the near ultraviolet light-violet light region, optionally: 300-420nm.

[0031] According to the embodiment of the present invention, the LED light source has a full spectrum, a high color rendering index and excellent luminous efficiency.

[0032] Beneficial effects of the present invention:

[0033] In summary, compared with the prior art, the advantages of the present invention are:

[0034] (1) The luminescent material related to the present invention has cyan light, green light and red light, which can effectively fill the cyan light "gap" in white light LEDs, and has high external quantum efficiency and good color rendering performance.

[0035] (2) The excitation range of the luminescent material related to the present invention is relatively wide and is located in the near-ultraviolet light-violet light region (300-420nm), which can effectively avoid the use of 450-465nm blue light chips and reduce the harm of blue light.

[0036] (3) The luminescent material manufacturing method related to the present invention is feasible, the production process is simple, and it is convenient for large-scale production.

[0037] (4) The co-doping technology of the present invention can realize the single-matrix tunable cyan / red light emission with two activated ions co-activated by adding blue commercial phosphor BaMgAl2O3 that is well matched with the purple light chip. 10 O 17 :Eu 2+ , can realize full-spectrum LED with uniform spectral intensity ratio and wide spectral range. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is the XRD spectrum of the luminescent material prepared in Example 19.

[0039] Figure 2 This is the excitation and emission spectra of the luminescence prepared in Example 19.

[0040] Figure 3 This is the electroluminescence spectrum of the LED white light source prepared in Example 21.

[0041] Figure 4 This is the electroluminescence spectrum of the LED white light source prepared in Comparative Example 1. Specific implementation plan

[0042] Example 1

[0043] Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 La(PO4)7 and its preparation

[0044] According to the stoichiometric ratio, weigh SrCO3: 1.1795g, MgO: 0.0392g, La2O3: 0.1629g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.1896g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0045] Example 2

[0046] Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01 La(PO4)7 and its preparation

[0047] According to the stoichiometric ratio, weigh BaCO3: 1.5740g, MgO: 0.0392g, La2O3: 0.1629g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.5904g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0048] Example 3

[0049] Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Gd(PO4)7 and its preparation

[0050] According to the stoichiometric ratio, weigh SrCO3: 1.1795g, MgO: 0.0392g, Gd2O3: 0.1813g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.0957g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0051] Example 4

[0052] Ba 7.99 Eu 0.01 Mg 0.99 Mn 0.01Gd(PO4)7 and its preparation

[0053] According to the stoichiometric ratio, weigh BaCO3: 1.5740g, MgO: 0.0392g, Gd2O3: 0.1813g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.4902g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0054] Example 5

[0055] Sr 7.99 Eu 0.01 Mg 0.99 Mn 0.01 Y(PO4)7 and its preparation

[0056] According to the stoichiometric ratio, weigh SrCO3: 1.1795g, MgO: 0.0392g, Y2O3: 0.1129g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.1396g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0057] Example 6

[0058] Ba 7.99 Eu 0.01 Mg0.99 Mn 0.01 Y(PO4)7 and its preparation

[0059] According to the stoichiometric ratio, weigh BaCO3: 1.5740g, MgO: 0.0392g, Y2O3: 0.1129g, NH4H2PO4: 0.8050g, Eu2O3: 0.0018g, MnCO3: 0.0012g, a total of 2.5341g. After the above raw materials are fully mixed, dry grind for 30-40 minutes or wet grind for 15-20 minutes. The mixture obtained above was placed in a corundum crucible and moved into an oven at 200°C. After being kept warm for 2 hours, it was cooled to room temperature in the oven. The pre-sintered sample was fully dry-ground for 20 minutes, placed in the original corundum crucible and moved into a tubular furnace. A nitrogen / hydrogen mixture (volume ratio 90% / 10%) was introduced, and the temperature was raised to 300°C at a heating rate of 5°C / min. After being kept warm for 30 minutes, the temperature was further raised to 1300°C, kept warm for 8-10 hours, and then cooled to room temperature in the oven. The sintered product was fully ground to obtain a Eu 2+ ,Mn 2+ Co-doped cyan-red composite ultra-wideband fluorescent material.

[0060] Embodiment 7-20

[0061] The above-mentioned Examples 1-6 are detailed examples, and the difference between Examples 7-20 is only in the raw materials, pre-sintering / calcining temperature and holding time. The raw materials used are prepared according to the stoichiometric ratio. The raw materials, amounts, chemical formulas, pre-sintering / calcining temperatures and holding times of each compound in Examples 7-20 are shown in Table 1 below.

[0062] Table 1

[0063]

[0064]

[0065] Embodiment 21

[0066] LED light source preparation: using commercial blue phosphor BaMgAl 10 O 17 :Eu 2+ Combined with the cyan-red composite luminescent material obtained in Example 20, the ratio of the two is adjusted, and then packaged with a 400nm purple LED chip to obtain a white light LED light source device.

[0067] Comparative Example 1

[0068] LED light source preparation: using commercial blue phosphor BaMgAl 10 O 17 :Eu 2+, Yellow phosphor YAG:Ce 3+ and red phosphor CaAlSiN3:Eu 2+ The three are combined and the ratio is adjusted, and then packaged with a 400nm purple LED chip to obtain a white light LED light source device.

[0069] The photoelectric performance of LED light sources was tested using the Hangzhou Yuanfang Optoelectronics LED light color testing system (HASS2000).

[0070] The lumen efficiencies of Example 21 and Comparative Example 1 are 182 lm / W and 150 lm / W, respectively. From the electroluminescent spectrum of the light source, it can be seen that the light source obtained in Example 21 has a higher photoelectric conversion efficiency, a wider spectrum coverage, and is closer to the full spectrum than the white light LED light source obtained in Comparative Example 1, and has a higher color rendering index. This indicates that the luminescent material obtained in Example 21 is conducive to improving the display index of the material and can obtain a full spectrum.

[0071] The phase analysis test of the luminescent material in the embodiment was carried out using an X-ray diffractometer (DMAX 2500PC, Rigaku Corporation, Japan), and the excitation spectrum and emission spectrum of the luminescent material in the embodiment were tested using an FLS 980 (Edinburgh Instruments) fluorescence spectrometer.

[0072] Testing method for internal quantum yield, external quantum yield and absorption efficiency: Use FLS 980 (Edinburgh Instruments) fluorescence spectrometer equipped with a 450W xenon lamp coupled to an optical integrating sphere, and then use a standard halogen tungsten lamp to calibrate the optical response of the above instrument, and then test and calculate the internal quantum yield, external quantum yield and absorption efficiency of the material.

[0073] Thermal stability test method: The luminescent material is placed on a heating platform (77-873K, THMS 600, Linkam Scientific Instruments), the sample holder temperature is controlled by a temperature control program, and the emission spectrum of the sample at different temperatures (25-200°C) is collected by a FLS 980 (Edinburgh Instruments) fluorescence spectrometer. The thermal stability of the material is analyzed and evaluated by the integrated intensity values ​​of the emission spectrum at different temperatures.

[0074] from Figure 2 It can be seen that the divalent europium and manganese ion co-activated fluorescent luminescent material prepared in Example 19 has high luminescence brightness, the emitted fluorescence wavelength is in the range of 470-750nm, and the strongest emission peaks are located at 520nm and 600nm respectively. And it has a tunable half-peak width: in the range of 100-250nm. In addition, other test results of the present invention are shown in Table 2.

[0075] Table 2 Performance parameters of the embodiments

[0076] Internal quantum yield Absorption rate External quantum yield <![CDATA[I 150℃ / I 25℃ ]]> Embodiment 13 95％ 58％ 55％ 81％ Embodiment 14 84％ 48％ 40％ 84％ Embodiment 15 82％ 52％ 43％ 79％ Example 16 91％ 39％ 35％ 85％ Embodiment 17 78％ 41％ 32％ 91％ Embodiment 18 81％ 38％ 31％ 93％ Embodiment 19 89％ 40％ 36％ 94％

[0077] Finally, the following statement is made on the protection scope of the present invention: the above-listed embodiments are only exemplary descriptions of the present invention and are by no means limiting of the embodiments. Therefore, any changes in different forms and methods made by those skilled in the art based on the above description should be within the protection scope of the present invention.

Claims

1. A cyan-red composite ultra-broadband luminescent material, It is characterized in that The chemical composition of the luminescent material is: 8-x Eu x )(Mg 1-y Mn y )B(PO 4 ) 7 ,in: A is one of Sr and Ba alkaline earth metals or a combination thereof; B is one of trivalent metal ions of La, Y, Sc, Gd, Ga, In, and Al, or a combination thereof.

2. The luminescent material according to claim 1, It is characterized in that 0 <x≤20%,0<y≤20%。 3. The luminescent material according to claim 1, It is characterized in that The luminescent material can be excited by a 365-420nm near-ultraviolet light / purple light chip to emit cyan-red light, and the emission spectrum covers 460-750nm.

4. The luminescent material according to claim 1, It is characterized in that The chemical composition of the luminescent material may be: Mr. 7.99 I 0.01 Mg 0.99 Mn 0.01 The(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 The(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 Sc(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 Sc(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 Y(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 Y(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 Gd(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 Gd(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 Al(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 Al(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 In(PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 In(PO 4 ) 7 、Sr 7.99 I 0.01 Mg 0.99 Mn 0.01 Ga((PO 4 ) 7 、Ba 7.99 I 0.01 Mg 0.99 Mn 0.01 Ga((PO 4 ) 7 。 5. The method for preparing the luminescent material according to claim 1, It is characterized in that The preparation method comprises the following steps: 1) According to the chemical formula of the material (A 8-x Eu x )(Mg 1-y Mn y )B(PO 4 ) 7 Weigh the compound raw materials and additives of each element in a stoichiometric ratio, add grinding media and grind them fully to obtain a mixture; 2) placing the mixture obtained in step 1) into a corundum crucible, placing it in an oven for pre-sintering, cooling it naturally to room temperature after the pre-sintering is completed, and fully grinding the obtained pre-sintered product, and then placing it in a tubular furnace for calcining in a protective atmosphere, and cooling it to room temperature with the furnace after the sintering is completed to obtain a sintered product; 3) The sintered product obtained in step 2) is fully ground, cleaned and sieved to obtain the target material; Optionally, the auxiliary agent in step 1) may be: NaCl, Na 2 O, LiCl, Li 2 CO 3 , H 3 BO 3 、Si 3 N 4 , Gd 2 O 3 , SrF 2 MgF 2 , BaF 2 ; Optionally, the grinding medium in step 1) may be: methanol, ethanol, ultrapure water; Optionally, the grinding time in step 1) can be selected as: 20-120 min; Optionally, the protective gas in step 2) may be high-purity nitrogen or a nitrogen / hydrogen mixture (volume ratio 90% / 10%); Optionally, the pre-firing temperature in step 2) can be 200-300° C., and the holding time can be 1-8 hours; Optionally, the calcination temperature in step 2) can be 1200-1400° C., and the holding time can be 2-24 hours.

6. The luminescent material according to claim 1, It is characterized in that The luminescent material can be used to realize a full-spectrum white light LED light source, and can be applied to the fields of healthy lighting, special place lighting, high-power lighting, etc.

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