Transparent ceramic target material for heat dissipation of vehicle-mounted OLED (Organic Light Emitting Diode) and preparation method of transparent ceramic target material

Abstract

The invention discloses a transparent ceramic target material for heat dissipation of a vehicle-mounted OLED (Organic Light Emitting Diode) and a preparation method of the transparent ceramic target material, and belongs to the technical field of ceramic target materials. The preparation method comprises the following steps: firstly, enabling aluminum powder to generate AIN nano powder under the action of nitrogen, then dispersing the AIN nano powder into a solvent, sequentially adding gallium nitrate, zinc nitrate and acetylacetone, and treating after reaction to obtain AlN-coated GZO nano powder; gallium nitrate and zinc nitrate are dispersed in a solvent, a complexing agent and magnesium nitrate hexahydrate are added for dispersion, polyethylene glycol is added for a reaction, GZO-MgO composite sol is obtained, AlN-coated GZO nanopowder and the GZO-MgO composite sol are mixed, yttrium nitrate, tin tetrachloride, a binder and an ammonium polyacrylate aqueous solution are added, the mixture is stirred uniformly, and the GZO-MgO nanopowder is obtained. After the pH value is adjusted, ball milling, degassing treatment and sintering are conducted, and the transparent ceramic target material for vehicle-mounted OLED heat dissipation is obtained. The ceramic target material provided by the invention has the characteristics of high light transmittance, high electric conductivity and high heat conductivity, and can effectively prolong the service life of an OLED device.

Description

Technical Field

[0001] This invention belongs to the field of ceramic target technology, specifically relating to a transparent ceramic target for heat dissipation of automotive OLEDs and its preparation method. Background Technology

[0002] Transparent conductive ceramic targets are one of the core materials in the modern optoelectronic industry. Their main materials are indium tin oxide (ITO) and zinc oxide-based materials (such as aluminum-doped zinc oxide (AZO) and gallium-doped zinc oxide (GZO)). In the display and touch fields, transparent conductive films prepared by magnetron sputtering using these targets have become standard electrode materials for devices such as liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs), and touchscreens due to their combination of high transmittance and low resistivity. With the rapid development of automotive displays towards larger sizes, higher brightness, greater flexibility, and higher reliability, the market demand for transparent electrodes extends beyond optoelectronic performance, placing higher requirements on their stability and multifunctional integration under complex operating conditions.

[0003] Existing mainstream transparent ceramic targets and their thin films suffer from low intrinsic thermal conductivity, limiting their application in next-generation high-performance displays, particularly automotive OLEDs. During OLED operation, especially in high-brightness displays or high-temperature environments (such as a car dashboard under direct summer sun), the Joule heat generated by the current passing through the electrodes and the heat from the organic light-emitting layer itself cannot be effectively dissipated. This heat accumulates inside the device, causing a sharp drop in OLED luminous efficiency, color shift, and rapidly accelerating the irreversible aging of organic functional materials, thus significantly shortening the display's lifespan. Secondly, during magnetron sputtering deposition, the bombardment of the target by high-energy particles and the heat released during film deposition, due to the limited heat dissipation capacity of the target itself, can induce localized thermal stress, affecting the large-area uniformity of the film and potentially causing radiative thermal damage to heat-sensitive organic substrates or device structures.

[0004] Therefore, it is essential to propose a new transparent ceramic target for heat dissipation of automotive OLEDs and its preparation method. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a transparent ceramic target for heat dissipation of automotive OLEDs and its preparation method.

[0006] The first aspect of this invention is to provide a method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs, comprising the following steps: S1: To generate AlN nanoparticles from aluminum powder under the action of nitrogen gas; S2: Disperse AlN nanopowder in solvent one, add gallium nitrate, zinc nitrate and acetylacetone in sequence for reflux reaction, centrifuge, wash and dry after reaction to obtain AlN@GZO nanopowder; S3: Gallium nitrate and zinc nitrate are dispersed in solvent 2, and complexing agent and magnesium nitrate hexahydrate are added in sequence and dispersed evenly. Finally, polyethylene glycol is added to react and GZO-MgO composite sol is obtained. S4: AlN@GZO nanopowder and GZO-MgO composite sol are mixed, yttrium nitrate and tin tetrachloride are added and dispersed evenly, then binder and ammonium polyacrylate aqueous solution are added, the pH value is adjusted and ball milling is performed, and degassing is performed to obtain composite slurry; S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0007] It should be noted that the present invention prepares aluminum nitride (AlN) by nitridation, and then uses sol-gel in-situ coating technology to perform hydrolysis-condensation reaction on the surface of AlN nanoparticles with a precursor solution containing gallium and zinc ions to form a uniform amorphous GZO (gallium zinc oxide). During the target sintering process, the amorphous GZO layer and the substrate material are densified and crystallized together, and finally a complete, dense crystalline GZO shell with excellent conductivity is formed on the outside of AlN.

[0008] In some embodiments, the mass ratio of AlN nanopowder to gallium nitrate is 1:2-2.5; in S2, the ratio of gallium nitrate, zinc nitrate and acetylacetone is 40-50g:37-42g:3-4mL; the solvent is selected from at least one of anhydrous ethanol and isopropanol.

[0009] In some embodiments, in S3, the mass ratio of gallium nitrate, zinc nitrate, and magnesium nitrate hexahydrate is 15-15.5:12-13:5-7.

[0010] In some embodiments, solvent 2 is selected from at least one of ethylene glycol, diethylene glycol, and glycerol; the mass of polyethylene glycol is 80-85% of the mass of magnesium nitrate hexahydrate, and the average molecular weight of polyethylene glycol is 2000-4000; the complexing agent is selected from at least one of citric acid and tartaric acid, and the mass of the complexing agent is 3-4 times the mass of magnesium nitrate hexahydrate.

[0011] In some embodiments, the mass ratio of AlN@GZO nanopowder to GZO-MgO composite sol is 4-5:4; the mass amount of yttrium nitrate is 1-1.5% of the mass of AlN@GZO nanopowder; the mass ratio of yttrium nitrate, tin tetrachloride, binder, and ammonium polyacrylate aqueous solution is 0.5-0.7:1.3-1.7:2.5-3.5:1-1.5; the mass fraction of ammonium polyacrylate aqueous solution is 35-45%; and the binder is selected from at least one of polyvinylpyrrolidone and polyvinyl alcohol.

[0012] In some embodiments, in S1, the nitrogen process involves introducing nitrogen at a flow rate of 3-5 L / min, raising the temperature to 590-620°C at a rate of 8-12°C / min, and holding at that temperature for 1.5-2.5 hours.

[0013] In some embodiments, in S2, the reflux reaction is carried out in an oil bath at 75-85°C for 2.5-3.5 hours.

[0014] In some embodiments, in S3, the reaction is carried out at 55-65°C for 3.5-4.5 hours.

[0015] In some embodiments, in step S4, the pH value is adjusted to 9.0-9.5, the ball milling time is 22-26 hours, the ball-to-material ratio is 3:1, and the degassing treatment is performed under vacuum for 25-35 minutes.

[0016] A second aspect of the present invention is to provide a transparent ceramic target for heat dissipation of automotive OLEDs.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention creatively introduces a composite structure consisting of highly thermally conductive aluminum nitride (AlN) and a GZO layer into the substrate. The high thermal conductivity of AlN enables rapid heat dissipation from the OLED, while the GZO conductive shell surrounding it ensures excellent conductivity of the electrodes. This design reduces the scattering of phonons as they cross grain boundaries in the conductive phase, ensuring efficient heat transfer from the GZO layer to the AlN.

[0018] 2. The transparent ceramic target material for heat dissipation of automotive OLED provided by the present invention has the synergistic characteristics of high light transmittance, high electrical conductivity and high thermal conductivity. It can directly and efficiently dissipate the heat generated by the OLED light-emitting layer, reduce the working temperature of the display panel, extend the working life of OLED devices, and avoid defects such as brightness decay, color drift and screen damage at high temperatures. It can meet the needs of automotive HDR display and strong light visibility. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to specific embodiments.

[0020] Example 1 A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs includes the following steps: S1: Place aluminum powder in a tube furnace and heat it to 600℃ at 10℃ / min under a nitrogen flow (4L / min), and hold it for 2h to generate AlN nanopowder; S2: AIN nanopowder was dispersed in anhydrous ethanol, and gallium nitrate, zinc nitrate and acetylacetone were added in sequence in a ratio of 45g:40g:3.5mL. The mixture was reacted in an oil bath at 80℃ for 3h. After the reaction, the mixture was centrifuged, washed and dried to obtain AlN@GZO nanopowder. The mass ratio of AIN nanopowder to gallium nitrate was 1:2.5. S3: Gallium nitrate and zinc nitrate were dispersed in ethylene glycol, citric acid and magnesium nitrate hexahydrate were added sequentially and dispersed evenly, and finally polyethylene glycol was added and reacted at 60℃ for 4 hours to obtain GZO-MgO composite sol; wherein, the mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate was 15.2:12.5:6, the mass of polyethylene glycol was 82% of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol was 2000, and the mass of citric acid was 3.5 times the mass of magnesium nitrate hexahydrate; S4: AlN@GZO nanopowder and GZO-MgO composite sol were mixed in a mass ratio of 4.5:4. Yttrium nitrate and tin tetrachloride were added and dispersed evenly. Then, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution were added, and the pH value was adjusted to 9.0-9.5. The mixture was ball-milled for 24 hours and degassed under vacuum for 30 minutes to obtain a composite slurry. The mass amount of yttrium nitrate was 1.2% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution was 0.6:1.5:3:1.2, the mass fraction of ammonium polyacrylate aqueous solution was 40%, and the ball-to-powder ratio was 3:1. S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0021] Example 2 A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs includes the following steps: S1: Place aluminum powder in a tube furnace and heat it to 620℃ at 12℃ / min under a nitrogen flow (5 L / min), and hold it for 2.5 h to generate AlN nanoparticles; S2: AIN nanopowder was dispersed in isopropanol, and gallium nitrate, zinc nitrate and acetylacetone were added in sequence in a ratio of 50g:42g:4mL. The mixture was reacted in an oil bath at 85℃ for 2.5h. After the reaction, the mixture was centrifuged, washed and dried to obtain AlN@GZO nanopowder. The mass ratio of AIN nanopowder to gallium nitrate was 1:2.5. S3: Gallium nitrate and zinc nitrate are dispersed in diethylene glycol, tartaric acid and magnesium nitrate hexahydrate are added sequentially and dispersed evenly, and finally polyethylene glycol is added and reacted at 65°C for 3.5 h to obtain GZO-MgO composite sol; wherein, the mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate is 15.5:13:7, the mass of polyethylene glycol is 85% of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol is 4000, and the mass of tartaric acid is 4 times the mass of magnesium nitrate hexahydrate; S4: AlN@GZO nanopowder and GZO-MgO composite sol were mixed in a mass ratio of 5:4. Yttrium nitrate and tin tetrachloride were added and dispersed evenly. Then, polyvinyl alcohol and ammonium polyacrylate aqueous solution were added, and the pH value was adjusted to 9.0-9.5. The mixture was ball-milled for 26 hours and degassed under vacuum for 35 minutes to obtain a composite slurry. The mass amount of yttrium nitrate was 1.5% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinyl alcohol and ammonium polyacrylate aqueous solution was 0.7:1.7:3.5:1.5, the mass fraction of ammonium polyacrylate aqueous solution was 45%, and the ball-to-powder ratio was 3:1. S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0022] Example 3 A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs includes the following steps: S1: Place aluminum powder in a tube furnace and heat it to 590℃ at 8℃ / min under a nitrogen flow (3L / min), and hold it for 2.5 h to generate AlN nanoparticles; S2: AIN nanopowder was dispersed in anhydrous ethanol, and gallium nitrate, zinc nitrate and acetylacetone were added in sequence in a ratio of 40g:37g:3mL. The mixture was reacted in an oil bath at 75℃ for 3.5h. After the reaction, the mixture was centrifuged, washed and dried to obtain AlN@GZO nanopowder. The mass ratio of AIN nanopowder to gallium nitrate was 1:2. S3: Gallium nitrate and zinc nitrate are dispersed in glycerol, citric acid and magnesium nitrate hexahydrate are added sequentially and dispersed evenly, and finally polyethylene glycol is added and reacted at 55℃ for 4.5h to obtain GZO-MgO composite sol; wherein, the mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate is 15:12:5, the mass of polyethylene glycol is 80% of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol is 2000, and the mass of citric acid is 3 times the mass of magnesium nitrate hexahydrate; S4: AlN@GZO nanopowder and GZO-MgO composite sol were mixed in a mass ratio of 4:4. Yttrium nitrate and tin tetrachloride were added and dispersed evenly. Then, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution were added, and the pH value was adjusted to 9.0-9.5. The mixture was ball-milled for 22 hours and degassed under vacuum for 35 minutes to obtain a composite slurry. The mass amount of yttrium nitrate was 1% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution was 0.5:1.3:2.5:1, the mass fraction of ammonium polyacrylate aqueous solution was 35%, and the ball-to-powder ratio was 3:1. S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0023] Example 4 A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs includes the following steps: S1: Place aluminum powder in a tube furnace and heat it to 610℃ at 8℃ / min under a nitrogen flow (5 L / min), and hold it for 2.5 h to generate AlN nanoparticles; S2: AIN nanopowder was dispersed in anhydrous ethanol, and gallium nitrate, zinc nitrate and acetylacetone were added in sequence in a ratio of 43g:39g:4mL. The mixture was reacted in an oil bath at 80℃ for 3.5h. After the reaction, the mixture was centrifuged, washed and dried to obtain AlN@GZO nanopowder. The mass ratio of AIN nanopowder to gallium nitrate was 1:2.5. S3: Gallium nitrate and zinc nitrate were dispersed in ethylene glycol, citric acid and magnesium nitrate hexahydrate were added sequentially and dispersed evenly, and finally polyethylene glycol was added and reacted at 65°C for 4 hours to obtain GZO-MgO composite sol; wherein, the mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate was 15.5:12:6, the mass of polyethylene glycol was 84% ​​of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol was 2000, and the mass of citric acid was 3.5 times the mass of magnesium nitrate hexahydrate; S4: AlN@GZO nanopowder and GZO-MgO composite sol were mixed in a mass ratio of 4.2:4. Yttrium nitrate and tin tetrachloride were added and dispersed evenly. Then, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution were added, and the pH value was adjusted to 9.0-9.5. The mixture was ball-milled for 23 hours and degassed under vacuum for 30 minutes to obtain a composite slurry. The mass amount of yttrium nitrate was 1.4% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution was 0.7:1.3:3:1.5, the mass fraction of ammonium polyacrylate aqueous solution was 38%, and the ball-to-powder ratio was 3:1. S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0024] Example 5 A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs includes the following steps: S1: Place aluminum powder in a tube furnace and heat it to 610℃ at 8℃ / min under a nitrogen flow (4 L / min), and hold it for 2.5 h to generate AlN nanoparticles; S2: AIN nanopowder was dispersed in isopropanol, and gallium nitrate, zinc nitrate and acetylacetone were added in sequence in a ratio of 45g:42g:4mL. The mixture was reacted in an oil bath at 82℃ for 3.5h. After the reaction, the mixture was centrifuged, washed and dried to obtain AlN@GZO nanopowder. The mass ratio of AIN nanopowder to gallium nitrate was 1:2.5. S3: Gallium nitrate and zinc nitrate were dispersed in glycerol, tartaric acid and magnesium nitrate hexahydrate were added sequentially and dispersed evenly, and finally polyethylene glycol was added and reacted at 60℃ for 4h to obtain GZO-MgO composite sol; wherein, the mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate was 15.4:12.8:5, the mass of polyethylene glycol was 85% of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol was 2000, and the mass of tartaric acid was 4 times the mass of magnesium nitrate hexahydrate; S4: AlN@GZO nanopowder and GZO-MgO composite sol were mixed in a mass ratio of 5:4. Yttrium nitrate and tin tetrachloride were added and dispersed evenly. Then, polyvinyl alcohol and ammonium polyacrylate aqueous solution were added, and the pH value was adjusted to 9.0-9.5. The mixture was ball-milled for 25 hours and degassed under vacuum for 35 minutes to obtain a composite slurry. The mass amount of yttrium nitrate was 1.4% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinyl alcohol and ammonium polyacrylate aqueous solution was 0.6:1.6:3.5:1.5, the mass fraction of ammonium polyacrylate aqueous solution was 45%, and the ball-to-powder ratio was 3:1. S5: The composite slurry is cast and sintered to obtain a transparent ceramic target for heat dissipation of automotive OLEDs.

[0025] Comparative Example 1 It is basically the same as Example 1, except that AlN@GZO nanopowder is not added, that is, steps S1 and S2 are omitted, and AlN@GZO nanopowder is not added in S4.

[0026] Comparative Example 2 This is basically the same as Example 1, except that the AlN@GZO nanopowder is replaced with physical mixing. The transparent ceramic target material provided in this embodiment is prepared by the following steps: S1: Place aluminum powder in a tube furnace and heat it to 600℃ at 10℃ / min under a nitrogen flow (4L / min), and hold it for 2h to generate AlN nanopowder; S2: Gallium nitrate and zinc nitrate were dispersed in ethylene glycol, citric acid and magnesium nitrate hexahydrate were added sequentially and dispersed evenly, and finally polyethylene glycol was added and reacted at 60°C for 4 hours to obtain GZO-MgO composite sol. The GZO-MgO composite sol was calcined at 600°C for 2 hours to obtain GZO precursor powder. The mass ratio of gallium nitrate, zinc nitrate and magnesium nitrate hexahydrate was 15.2:12.5:6, the mass of polyethylene glycol was 82% of the mass of magnesium nitrate hexahydrate, the average molecular weight of polyethylene glycol was 2000, and the mass of citric acid was 3.5 times the mass of magnesium nitrate hexahydrate. S3: AlN nanopowder and GZO precursor powder in a mass ratio of 5.85:7.9 were mixed, yttrium nitrate and tin tetrachloride were added and dispersed evenly, then polyvinylpyrrolidone and ammonium polyacrylate aqueous solution were added, the pH value was adjusted to 9.0-9.5, ball milling was performed for 24 hours, and degassing was carried out under vacuum for 30 minutes to obtain a composite slurry; wherein, the mass amount of yttrium nitrate was 1.2% of the mass of AlN@GZO nanopowder, the mass ratio of yttrium nitrate, tin tetrachloride, polyvinylpyrrolidone and ammonium polyacrylate aqueous solution was 0.6:1.5:3:1.2, the mass fraction of ammonium polyacrylate aqueous solution was 40%, and the ball-to-powder ratio was 3:1; S4: The composite slurry is cast and sintered to obtain a transparent ceramic target.

[0027] Comparative Example 3 The process is basically the same as in Example 1, except that: the GZO layer is not coated on the outer layer of the AlN nanopowder, that is, step S2 is omitted, and the AlN@GZO nanopowder in S4 is replaced with AlN nanopowder of the same mass as in Example 1.

[0028] The ceramic targets prepared in Examples 1-5 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in Table 1.

[0029] Performance testing methods: Sheet resistance was tested using the four-probe method, with 9 points measured for each sample and the average taken; resistivity was tested using the van der Bauer method at room temperature under a magnetic field strength of 0.5 T; thermal conductivity was tested using the laser scintillation method; the time it took for brightness to decay to 50% was tested at 85℃ / 85%RH for a set period; transmittance was tested using ultraviolet-visible spectrophotometry, with a wavelength range of 300-800nm, and the value at 550nm was used as the standard.

[0030] Table 1 As can be seen from Table 1, the transparent ceramic target material for heat dissipation of automotive OLEDs provided in Embodiments 1-5 of the present invention has excellent electrical conductivity, light transmittance and thermal conductivity, and its excellent heat dissipation capability significantly extends the lifespan of OLED devices in accelerated aging tests.

[0031] As can be seen from the comparative examples, Comparative Example 1, due to the absence of AlN@GZO nanopowder, exhibits poor thermal conductivity. During accelerated life testing, the inability to dissipate accumulated heat leads to accelerated aging. Comparative Example 2, which incorporates AlN nanopowder and GZO precursor powder through physical mixing, results in randomly dispersed insulating AlN particles that disrupt the conductive pathways of GZO, leading to an increase in resistivity. Although a certain amount of AlN particles are added, they are susceptible to interfacial thermal resistance, preventing the full realization of AlN's high thermal conductivity potential and limiting the improvement in thermal conductivity. Comparative Example 3, lacking a GZO layer coating on the AlN nanopowder, exhibits the worst overall performance. The exposed AlN readily undergoes a solid-phase reaction with the GZO matrix, blocking conductive channels and significantly increasing resistivity. Furthermore, AlN is prone to agglomeration, forming scattering centers that reduce thermal conductivity.

[0032] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs, characterized in that, Includes the following steps: S1: To generate AlN nanoparticles from aluminum powder under the action of nitrogen gas; S2: The AlN nanopowder is dispersed in solvent one, and gallium nitrate, zinc nitrate and acetylacetone are added sequentially for reflux reaction. After the reaction, centrifugation, washing and drying are performed to obtain AlN@GZO nanopowder. S3: Gallium nitrate and zinc nitrate are dispersed in solvent 2, and complexing agent and magnesium nitrate hexahydrate are added in sequence and dispersed evenly. Finally, polyethylene glycol is added to react and GZO-MgO composite sol is obtained. S4: The AlN@GZO nanopowder and the GZO-MgO composite sol are mixed, yttrium nitrate and tin tetrachloride are added and dispersed evenly, then a binder and an aqueous solution of ammonium polyacrylate are added, the pH value is adjusted and then ball milled and degassed to obtain a composite slurry; S5: The composite slurry is cast and sintered to obtain the transparent ceramic target material for heat dissipation of automotive OLED.

2. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, The mass ratio of the AlN nanopowder to the gallium nitrate is 1:2-2.5; in step S2, the ratio of gallium nitrate, zinc nitrate, and acetylacetone is 40-50g:37-42g:3-4mL; the solvent is selected from at least one of anhydrous ethanol and isopropanol.

3. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, In S3, the mass ratio of gallium nitrate, zinc nitrate, and magnesium nitrate hexahydrate is 15-15.5:12-13:5-7.

4. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, The solvent is selected from at least one of ethylene glycol, diethylene glycol, and glycerol; the mass of the polyethylene glycol is 80-85% of the mass of the magnesium nitrate hexahydrate, and the average molecular weight of the polyethylene glycol is 2000-4000; the complexing agent is selected from at least one of citric acid and tartaric acid, and the mass of the complexing agent is 3-4 times the mass of the magnesium nitrate hexahydrate.

5. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, The mass ratio of AlN@GZO nanopowder to GZO-MgO composite sol is 4-5:4; the mass amount of yttrium nitrate is 1-1.5% of the mass amount of AlN@GZO nanopowder; the mass ratio of yttrium nitrate, tin tetrachloride, binder, and ammonium polyacrylate aqueous solution is 0.5-0.7:1.3-1.7:2.5-3.5:1-1.5; the mass fraction of the ammonium polyacrylate aqueous solution is 35-45%; the binder is selected from at least one of polyvinylpyrrolidone and polyvinyl alcohol.

6. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, In S1, the nitrogen process involves introducing nitrogen at a flow rate of 3-5 L / min, raising the temperature to 590-620℃ at a rate of 8-12℃ / min, and holding at that temperature for 1.5-2.5 hours.

7. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, In S2, the reflux reaction is carried out in an oil bath at 75-85°C for 2.5-3.5 hours.

8. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, In S3, the reaction is carried out at 55-65℃ for 3.5-4.5 hours.

9. The method for preparing a transparent ceramic target for heat dissipation of automotive OLEDs according to claim 1, characterized in that, In step S4, the pH value is adjusted to 9.0-9.5, the ball milling time is 22-26 hours, the ball-to-material ratio is 3:1, and the degassing treatment is performed under vacuum conditions for 25-35 minutes.

10. A transparent ceramic target for heat dissipation of automotive OLEDs prepared by the preparation method according to any one of claims 1-9.

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