A ceramic-glass ceramic film composite structure fluorescent color wheel for white light LD illumination and a preparation method thereof

Abstract

This invention discloses a ceramic-glass ceramic thin film composite fluorescent color wheel for white light LD illumination and its preparation method, comprising a transparent ceramic substrate and a dual-color fluorescent glass-ceramic thin film. The dual-color fluorescent glass-ceramic thin film is a composite structure composed of a cyan-emitting fluorescent glass-ceramic thin film and an orange-red-emitting fluorescent glass-ceramic thin film, both composed of Al2O3 and Mg2Al4Si4O3. 16 :xEu 2+ The composite phase is composed of Al2O3 powder. Preparation method: A transparent ceramic substrate is obtained by dry pressing and sintering; Eu is used... 2+ Ion-doped Mg2Al4Si4O 16 A fluorescent color wheel is obtained by achieving red light emission through a one-step crystallization process and cyan light emission through a two-step crystallization process, with Al2O3 added as a scattering center, followed by sintering. The fluorescent color wheel obtained by this method effectively supplements both cyan and red light components, avoids photon reabsorption caused by the mixing of fluorescent materials, and exhibits excellent heat dissipation and good light uniformity.

Description

Technical Field

[0001] This invention belongs to the field of inorganic light-emitting materials, specifically relating to a ceramic-glass ceramic thin film composite fluorescent color wheel for white light LD illumination and its preparation method. Background Technology

[0002] With the continuous advancement of science and technology, high-power solid-state white lighting devices have advantages such as energy saving, controllable parameters, and environmental friendliness, and have been widely used in transportation, marine navigation, and plant growth. However, the application of light-emitting diodes (LEDs) at high operating power faces the key challenge of "efficiency degradation," which hinders their further development. Therefore, emerging laser diode (LD) devices have become the mainstream in the high-power lighting industry. To adapt to highly concentrated laser power, color converters such as PiG (Piluminated Glass), PiGF (Piglass Phosphor Film), and TPC (Transparent Polymer Phosphor Ceramic) are being widely developed to replace silicone resins. However, PiG has a low saturation threshold, and TPC is expensive and has complex manufacturing processes.

[0003] On the other hand, laser-driven white light is achieved by exciting yellow phosphors with a blue laser. However, due to the lack of cyan and red components, its color rendering index is low, ranging from 60 to 70, while its correlated color temperature (CCT > 6000 K) is high. (Reference: Interstitial Site Engineering for Creating Unusual Red Emission in La3Si6N11:Ce) 3+ (Chem. Mater. 2020, 32(8): 3631-3640) Lu3Al5O emits green light 12 Ce(LuAG:Ce), Y3Al5O with yellow light emission 12 A mixture of three phosphors—Ce (YAG:Ce) and red-emitting CaAlSiN3:Eu (CASN:Eu)—resulted in warm white light with a color rendering index of 94. The literature (Y. Toward High-Quality Laser-Driven Lightings: Chromaticity-Tunable Phosphor-in-Glass Film with “Phosphor Pattern” Design. Laser Photonics Rev. 2022, 16:2200040) demonstrates this through the ingenious design of Lu3Al5O... 12 :Ce 3+ (LuAG:Ce) and CaAlSiN3:Eu 2+(CASN:Eu) fluorescent glass films have enabled high-quality and high-brightness illumination. However, photon reabsorption due to phosphor mixing and the lack of cyan emission remain key challenges to be addressed in white light LD illumination. Furthermore, light uniformity is also a major challenge for laser-driven white light. Summary of the Invention

[0004] The purpose of this invention is to provide a ceramic-glass ceramic thin film composite fluorescent color wheel for white light LD illumination and its preparation method. This method can simplify the process and reduce costs. The prepared composite fluorescent color wheel can effectively supplement cyan and red light components, avoid photon reabsorption caused by the mixing of fluorescent materials, and has excellent heat dissipation capacity and good light uniformity.

[0005] The technical solution adopted in this invention is as follows: a ceramic-glass ceramic thin film composite structure fluorescent color wheel for white light LD illumination, wherein the fluorescent color wheel includes a transparent ceramic substrate and a dual-color fluorescent glass ceramic thin film distributed on the upper surface of the transparent ceramic substrate;

[0006] The transparent ceramic substrate has a single-phase Al2O3 structure; the dual-color fluorescent glass-ceramic film is a composite structure composed of a cyan-emitting fluorescent glass-ceramic film and an orange-red-emitting fluorescent glass-ceramic film.

[0007] Both the cyan-emitting fluorescent glass-ceramic film and the orange-red-emitting fluorescent glass-ceramic film are composed of Al2O3 and Mg2Al4Si4O3. 16 :xEu 2+ The composite phase has the general chemical formula (Mg2Al4Si4O) 16 :xEu 2+ ): yAl2O3, where x is Eu 2+ Mg2Al4Si4O 16 The mass percentage of x is 0.005 ≤ x ≤ 0.015; y is the mass percentage of Al2O3 in the composite phase, 0.04 ≤ y ≤ 0.12.

[0008] Preferably, the orange-red fluorescent glass-ceramic film accounts for 50-70% of the area of ​​the dual-color fluorescent glass-ceramic film.

[0009] To achieve the above-mentioned objective, this invention also provides a method for preparing a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination, comprising the following steps:

[0010] (1) Al2O3 powder is dry-pressed to obtain a ceramic green body, and the ceramic green body is vacuum sintered at 1600-1750℃ for 10-15h to obtain a transparent Al2O3 ceramic substrate.

[0011] (2) Preparation of dual-color fluorescent glass-ceramic thin film slurry;

[0012] (2-1) Using MgO, Al2O3, SiO2, and Eu2O3 as raw material powders, according to the chemical formula Mg2Al4Si4O 16 :xEu 2+ Weigh each raw material according to the stoichiometric ratio of the corresponding elements, where x is Eu. 2+ Mg2Al4Si4O 16 The mass percentage of each ingredient is 0.005 ≤ x ≤ 0.015; after mixing the above ingredients, they are successively ball-milled, dried, and ground to obtain a mixed raw material powder.

[0013] (2-2) The mixed raw material powder is placed in a lifting furnace, and after melting, water quenching and grinding, the precursor fluorescent glass powder is obtained.

[0014] (2-3) The precursor fluorescent glass powder was placed in an atmosphere furnace for sintering at a temperature of 1080-1120℃ and a holding time of 1-3h. After natural cooling, red fluorescent ceramic powder was obtained.

[0015] (2-4) Take out a portion of the red fluorescent ceramic powder, and continue to sinter the remaining red fluorescent ceramic powder in an atmosphere furnace. The sintering temperature is 1300-1360℃, the holding time is 1-3h, and the green fluorescent ceramic powder is obtained after natural cooling.

[0016] (2-5) Based on the chemical formula (Mg2Al4Si4O) 16 :xEu 2+ The value of y in yAl2O3 is used to weigh red fluorescent ceramic powder, cyan fluorescent ceramic powder and Al2O3 powder. The red fluorescent ceramic powder and cyan fluorescent ceramic powder are mixed with precursor fluorescent glass powder, organic binder and Al2O3 powder respectively to obtain red fluorescent glass ceramic mixed slurry and cyan fluorescent glass ceramic mixed slurry respectively.

[0017] (3) The red fluorescent glass-ceramic mixed slurry and the blue fluorescent glass-ceramic mixed slurry were coated on the transparent Al2O3 ceramic substrate according to the area ratio, and sintered at 700-760℃ for 10-30 min to obtain the ceramic-glass-ceramic thin film composite structure fluorescent color wheel.

[0018] Preferably, in steps (2-3) and (2-4), the atmosphere in the atmosphere furnace is nitrogen or a mixture of nitrogen and hydrogen.

[0019] Preferably, the atmosphere in the atmosphere furnace is a mixture of nitrogen and hydrogen in a volume ratio of 19:1.

[0020] Preferably, in steps (2-5), the mass ratio of the organic binder, red fluorescent ceramic powder / cyan fluorescent ceramic powder, and precursor fluorescent glass powder is 1:(0.5~1):1.

[0021] Preferably, in steps (2-5), the organic binder is a mixture of ethyl cellulose, diethylene glycol monobutyl ether acetate and terpineol.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention uses transparent Al2O3 ceramic as a substrate, which can effectively enhance the heat dissipation capacity of the fluorescent color wheel; the use of a dual-color fluorescent glass-ceramic thin film distributed on the above-mentioned ceramic substrate can effectively supplement the cyan and red light components, avoiding photon reabsorption caused by the mixing of fluorescent materials. At the same time, using fluorescent ceramic powder instead of phosphor powder can achieve zero thermal quenching.

[0024] 2. This invention is prepared using sintering techniques such as solid-state sintering, one-step glass crystallization, two-step glass crystallization, and bond sintering; it employs a single Eu... 2+ Ion-doped Mg2Al4Si4O 16 Red light emission is achieved through one-step crystallization, and cyan light emission is achieved through two-step crystallization. Al2O3 is added as a scattering center to adjust the color rendering and color temperature of white light, thereby achieving good light uniformity.

[0025] 3. The fluorescent color wheel of the ceramic-glass ceramic thin film composite structure prepared by the present invention, when excited by a 450-460nm blue laser diode, emits fluorescence that mixes with the blue laser to produce white light with a color temperature of 4600-6100K and a color rendering index of 88-95. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the fluorescent color wheel of the ceramic-glass-ceramic thin film composite structure of the present invention;

[0027] Figure 2 This is a SEM image of the fluorescent color wheel of the ceramic-glass ceramic thin film composite structure prepared in Example 2 of the present invention;

[0028] Figure 3 The emission spectrum of the fluorescent color wheel of the ceramic-glass ceramic thin film composite structure prepared in Example 2 of the present invention under 450 nm excitation is shown.

[0029] Figure 4 The image shows the color coordinate diagrams of the fluorescent color wheels of the ceramic-glass-ceramic thin film composite structures prepared in Examples 1-3 of this invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination is disclosed. The fluorescent color wheel includes a transparent ceramic substrate and a bicolor fluorescent glass-ceramic thin film distributed on the upper surface of the transparent ceramic substrate. The transparent ceramic substrate has a single-phase Al2O3 structure. The bicolor fluorescent glass-ceramic thin film is a composite structure composed of a cyan-emitting fluorescent glass-ceramic thin film and an orange-red-emitting fluorescent glass-ceramic thin film. Both the cyan-emitting and orange-red-emitting fluorescent glass-ceramic thin films are composed of Al2O3 and Mg2Al4Si4O3. 16 0.005Eu 2+ The composite phase has the general chemical formula (Mg2Al4Si4O) 16 0.005Eu 2+ ): 0.04Al2O3; the orange-red luminescent fluorescent glass-ceramic film accounts for 50% of the area of ​​the dual-color fluorescent glass-ceramic film.

[0033] The above-mentioned method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination includes the following steps:

[0034] (1) Al2O3 powder was dry-pressed to obtain a ceramic green body, and the ceramic green body was vacuum sintered at 1650℃ for 10h to obtain a transparent Al2O3 ceramic substrate.

[0035] (2) Preparation of dual-color fluorescent glass-ceramic thin film slurry;

[0036] (2-1) According to the chemical formula Mg2Al4Si4O 16 0.005Eu 2+ Weigh out 4.5g MgO, 11.7g Al2O3, 13.8g SiO2, and 0.15g Eu2O3 according to the stoichiometric ratio of the corresponding elements; mix the above raw materials and then ball-mill, dry, and grind them in sequence to obtain mixed raw material powder;

[0037] (2-2) The mixed raw material powder is placed in a lifting furnace, and after melting, water quenching and grinding, the precursor fluorescent glass powder is obtained.

[0038] (2-3) The precursor fluorescent glass powder was placed in an atmosphere furnace and sintered in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1080℃ and a holding time of 1 h. After natural cooling, red fluorescent ceramic powder was obtained.

[0039] (2-4) Take out a portion of the red fluorescent ceramic powder, and place the remaining portion of the red fluorescent ceramic powder in an atmosphere furnace. Sinter it in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1300℃ and a holding time of 1 h. After natural cooling, cyan fluorescent ceramic powder is obtained.

[0040] (2-5) Based on the chemical formula (Mg2Al4Si4O) 16 0.005Eu 2+ Weigh out 0.04% Al2O3 to obtain red fluorescent ceramic powder, cyan fluorescent ceramic powder and Al2O3 powder. Mix the red fluorescent ceramic powder and cyan fluorescent ceramic powder with precursor fluorescent glass powder and organic binder (a mixture of ethyl cellulose, diethylene glycol monobutyl ether acetate and terpineol) in a ratio of 1:0.5:1, and then mix with 4wt% Al2O3 powder to obtain red fluorescent glass-ceramic mixed slurry and cyan fluorescent glass-ceramic mixed slurry respectively.

[0041] (3) The red fluorescent glass-ceramic mixed slurry and the blue fluorescent glass-ceramic mixed slurry were coated on the transparent Al2O3 ceramic substrate according to the area ratio, and sintered at 700℃ for 10 min to obtain the ceramic-glass-ceramic thin film composite structure fluorescent color wheel.

[0042] After encapsulating the ceramic-glass-ceramic thin film composite fluorescent color wheel obtained in this embodiment with a 450nm blue laser, it emits broadband light with a wavelength of 470-750nm. The resulting white light has a color temperature of 6100K and a color rendering index of 88. Figure 4 As shown, the color coordinates are (0.313, 0.320).

[0043] Example 2

[0044] like Figure 1 As shown, a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination is disclosed. The fluorescent color wheel includes a transparent ceramic substrate and a bicolor fluorescent glass-ceramic thin film distributed on the upper surface of the transparent ceramic substrate. The transparent ceramic substrate has a single-phase Al2O3 structure. The bicolor fluorescent glass-ceramic thin film has a multiphase structure composed of a cyan-emitting fluorescent glass-ceramic thin film and an orange-red-emitting fluorescent glass-ceramic thin film. Both the cyan-emitting and orange-red-emitting fluorescent glass-ceramic thin films are composed of Al2O3 and Mg2Al4Si4O3. 16 0.01Eu 2+ The composite phase has the general chemical formula (Mg2Al4Si4O) 16 0.01Eu 2+ ): 0.08Al2O3; the orange-red luminescent fluorescent glass-ceramic film accounts for 60% of the area of ​​the dual-color fluorescent glass-ceramic film.

[0045] The above-mentioned method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination includes the following steps:

[0046] (1) Al2O3 powder was dry-pressed to obtain a ceramic blank, and the ceramic blank was vacuum-sintered at 1700℃ for 15h to obtain a transparent Al2O3 ceramic substrate.

[0047] (2) Preparation of dual-color fluorescent glass-ceramic thin film slurry;

[0048] (2-1) According to the chemical formula Mg2Al4Si4O 16 0.01Eu 2+ Weigh out 4.5g MgO, 11.7g Al2O3, 13.8g SiO2, and 0.30g Eu2O3 according to the stoichiometric ratio of the corresponding elements; mix the above raw materials and then ball-mill, dry, and grind them in sequence to obtain mixed raw material powder;

[0049] (2-2) The mixed raw material powder is placed in a lifting furnace, and after melting, water quenching and grinding, the precursor fluorescent glass powder is obtained.

[0050] (2-3) The precursor fluorescent glass powder was placed in an atmosphere furnace and sintered in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1100℃ and a holding time of 2 h. After natural cooling, red fluorescent ceramic powder was obtained.

[0051] (2-4) Take out a portion of the red fluorescent ceramic powder, and put the remaining portion of the red fluorescent ceramic powder into the atmosphere furnace. Sinter it in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1330℃ and a holding time of 2h. After natural cooling, cyan fluorescent ceramic powder is obtained.

[0052] (2-5) Based on the chemical formula (Mg2Al4Si4O) 16 0.01Eu 2+ Weigh out 0.08% Al2O3 to obtain red fluorescent ceramic powder, cyan fluorescent ceramic powder and Al2O3 powder. Mix the red fluorescent ceramic powder and cyan fluorescent ceramic powder with precursor fluorescent glass powder and organic binder (a mixture of ethyl cellulose, diethylene glycol monobutyl ether acetate and terpineol) in a ratio of 1:0.5:1, and then mix with 8wt% Al2O3 powder to obtain red fluorescent glass-ceramic mixed slurry and cyan fluorescent glass-ceramic mixed slurry respectively.

[0053] (3) The red fluorescent glass-ceramic mixed slurry and the blue fluorescent glass-ceramic mixed slurry were coated on the transparent Al2O3 ceramic substrate according to the area ratio, and sintered at 730℃ for 20 min to obtain the ceramic-glass-ceramic thin film composite structure fluorescent color wheel.

[0054] Figure 2 This is a SEM image of the fluorescent color wheel of the ceramic-glass-ceramic thin film composite structure. The image clearly shows two closely contacted dark and light regions. The dark region is the microstructure of transparent alumina, and the light region is the microstructure of the glass-ceramic thin film.

[0055] After encapsulating the ceramic-glass-ceramic thin film composite structure fluorescent color wheel obtained in this embodiment with a 450nm blue laser, as follows: Figure 3 As shown, it emits broadband light with wavelengths ranging from 470 to 750 nm; the resulting white light has a color temperature of 5700 K and a color rendering index of 95; as shown... Figure 4 As shown, the color coordinates are (0.333, 0.341).

[0056] Example 3

[0057] like Figure 1 As shown, a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination is disclosed. The fluorescent color wheel includes a transparent ceramic substrate and a bicolor fluorescent glass-ceramic thin film distributed on the upper surface of the transparent ceramic substrate. The transparent ceramic substrate has a single-phase Al2O3 structure. The bicolor fluorescent glass-ceramic thin film has a multiphase structure composed of a cyan-emitting fluorescent glass-ceramic thin film and an orange-red-emitting fluorescent glass-ceramic thin film. Both the cyan-emitting and orange-red-emitting fluorescent glass-ceramic thin films are composed of Al2O3 and Mg2Al4Si4O3. 16 0.015Eu 2+ The composite phase has the general chemical formula (Mg2Al4Si4O) 16 0.015Eu 2+ ): 0.12Al2O3; the orange-red luminescent fluorescent glass-ceramic film accounts for 70% of the area of ​​the dual-color fluorescent glass-ceramic film.

[0058] The above-mentioned method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination includes the following steps:

[0059] (1) Al2O3 powder was dry-pressed to obtain a ceramic blank, and the ceramic blank was vacuum-sintered at 1750℃ for 15h to obtain a transparent Al2O3 ceramic substrate.

[0060] (2) Preparation of dual-color fluorescent glass-ceramic thin film slurry;

[0061] (2-1) According to the chemical formula Mg2Al4Si4O 16 0.015Eu 2+ Weigh out 4.5g MgO, 11.7g Al2O3, 13.8g SiO2, and 0.45g Eu2O3 according to the stoichiometric ratio of the corresponding elements; mix the above raw materials and then ball-mill, dry, and grind them in sequence to obtain mixed raw material powder;

[0062] (2-2) The mixed raw material powder is placed in a lifting furnace, and after melting, water quenching and grinding, the precursor fluorescent glass powder is obtained.

[0063] (2-3) The precursor fluorescent glass powder was placed in an atmosphere furnace and sintered in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1120℃ and a holding time of 3 h. After natural cooling, red fluorescent ceramic powder was obtained.

[0064] (2-4) Take out a portion of the red fluorescent ceramic powder, and put the remaining portion of the red fluorescent ceramic powder into the atmosphere furnace. Sinter it in a mixed atmosphere of N2 (95 vol%) and H2 (5 vol%) at a sintering temperature of 1360℃ and a holding time of 3h. After natural cooling, cyan fluorescent ceramic powder is obtained.

[0065] (2-5) Based on the chemical formula (Mg2Al4Si4O) 16 0.015Eu 2+ Weigh out 0.12 wt% Al2O3 to obtain red fluorescent ceramic powder, cyan fluorescent ceramic powder and Al2O3 powder. Mix the red fluorescent ceramic powder and cyan fluorescent ceramic powder with precursor fluorescent glass powder and organic binder (a mixture of ethyl cellulose, diethylene glycol monobutyl ether acetate and terpineol) in a ratio of 1:1:1, and then mix with 12 wt% Al2O3 powder to obtain red fluorescent glass-ceramic mixed slurry and cyan fluorescent glass-ceramic mixed slurry respectively.

[0066] (3) The red fluorescent glass-ceramic mixed slurry and the blue fluorescent glass-ceramic mixed slurry were coated on the transparent Al2O3 ceramic substrate according to the area ratio, and sintered at 760℃ for 30 min to obtain the ceramic-glass-ceramic thin film composite structure fluorescent color wheel.

[0067] After encapsulating the ceramic-glass-ceramic thin film composite fluorescent color wheel obtained in this embodiment with a 450nm blue laser, it emits broadband light with a wavelength of 470-750nm. The resulting white light has a color temperature of 4600K and a color rendering index of 92. Figure 4 As shown, the color coordinates are (0.350, 0.356).

[0068] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination, characterized in that, The fluorescent color wheel comprises a transparent ceramic substrate and a dual-color fluorescent glass-ceramic film distributed on the upper surface of the transparent ceramic substrate; the transparent ceramic substrate has an Al2O3 single-phase structure; the dual-color fluorescent glass-ceramic film is a composite structure composed of a cyan-emitting fluorescent glass-ceramic film and an orange-red-emitting fluorescent glass-ceramic film; the preparation method of the fluorescent color wheel includes the following steps: (1) The Al2O3 powder was dry-pressed to obtain a ceramic blank, and the ceramic blank was vacuum sintered at 1600~1750℃ for 10~15h to obtain a transparent Al2O3 ceramic substrate. (2) Preparation of dual-color fluorescent glass-ceramic thin film slurry; (2-1) Using MgO, Al2O3, SiO2, and Eu2O3 as raw material powders, according to the chemical formula Mg2Al4Si4O 16 :xEu 2+ Weigh each raw material according to the stoichiometric ratio of the corresponding elements, where x is Eu. 2+ Mg2Al4Si4O 16 The mass percentage of each ingredient is 0.005 ≤ x ≤ 0.015; after mixing the above ingredients, they are successively ball-milled, dried, and ground to obtain a mixed raw material powder. (2-2) The mixed raw material powder is placed in a lifting furnace, and after melting, water quenching and grinding, the precursor fluorescent glass powder is obtained; (2-3) The precursor fluorescent glass powder was placed in an atmosphere furnace for sintering at a temperature of 1080~1120℃ and a holding time of 1~3h. After natural cooling, red fluorescent ceramic powder was obtained. (2-4) Take out a portion of the red fluorescent ceramic powder, and continue to sinter the remaining red fluorescent ceramic powder in an atmosphere furnace. The sintering temperature is 1300~1360℃, the holding time is 1~3h, and the green fluorescent ceramic powder is obtained after natural cooling. (2-5) Based on the chemical formula (Mg2Al4Si4O) 16 :xEu 2+ The red fluorescent ceramic powder, cyan fluorescent ceramic powder, and Al2O3 powder are weighed based on the value of y in yAl2O3, where y is the mass percentage of Al2O3 powder in either the red or cyan fluorescent ceramic powder, and 0.04≤y≤0.

12. The red fluorescent ceramic powder and cyan fluorescent ceramic powder are mixed with precursor fluorescent glass powder, organic binder, and Al2O3 powder, respectively, to obtain red fluorescent glass-ceramic mixed slurry and cyan fluorescent glass-ceramic mixed slurry, respectively. (3) The red fluorescent glass-ceramic mixed slurry and the blue fluorescent glass-ceramic mixed slurry were coated on the transparent Al2O3 ceramic substrate according to the area ratio, and sintered at 700~760℃ for 10~30min to obtain the ceramic-glass-ceramic thin film composite structure fluorescent color wheel.

2. The method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination according to claim 1, characterized in that, The orange-red fluorescent glass-ceramic film accounts for 50-70% of the area of ​​the dual-color fluorescent glass-ceramic film.

3. The method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination according to claim 1, characterized in that, In steps (2-3) and (2-4), the atmosphere in the atmosphere furnace is nitrogen or a mixture of nitrogen and hydrogen.

4. The method for preparing a ceramic-glass-ceramic thin film composite fluorescent color wheel for white light LD illumination according to claim 3, characterized in that, The atmosphere in the atmosphere furnace is a mixture of nitrogen and hydrogen in a volume ratio of 19:

1.

5. A method for preparing a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination according to claim 3 or 4, characterized in that, In steps (2-5), the mass ratio of organic binder, red fluorescent ceramic powder / cyan fluorescent ceramic powder, and precursor fluorescent glass powder is 1:(0.5~1):

1.

6. A method for preparing a ceramic-glass-ceramic thin-film composite fluorescent color wheel for white light LD illumination according to claim 3 or 4, characterized in that, In steps (2-5), the organic binder is a mixture of ethyl cellulose, diethylene glycol monobutyl ether acetate and terpineol.

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