A kind of substrate and its preparation method, light-emitting device and display screen
A substrate and substrate material technology, applied in the direction of electrical solid devices, semiconductor devices, organic semiconductor devices, etc., can solve the problems of poor thermal conductivity of the substrate, and achieve the effects of low thermal expansion coefficient, excellent electrical insulation, and excellent thermal conductivity
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Embodiment 1
[0073] (1) Nanosheets were prepared by ball milling hexagonal boron nitride particles for 48 hours and ultrasonicating for 5 hours.
[0074] (2) Mix the above-mentioned hexagonal boron nitride nanosheets with ethanolamine and ethanol solvent, adjust the pH to 8.5, and stir at room temperature for 24 hours, then wash and dry with deionized water to obtain hexagonal boron nitride that has been alcoholized on the surface Nanosheets. Wherein, the -H hydroxylation on the surface of the hexagonal boron nitride after alcoholization treatment forms hydroxyl boron nitride.
[0075] (3) Add cellulose, sodium hydroxide, and urea to deionized water, and mix well to obtain a mixed solution. In the mixed solution, the concentration of cellulose is 45 mg / ml, and the concentration of sodium hydroxide is 53 mg / ml, the concentration of urea is 115 mg / ml. After the above mixed solution was obtained, it was kept at -17°C for 12 h, and a surface-modified hexagonal boron nitride sheet with a vol...
Embodiment 2
[0080] A kind of flexible QLED device is prepared, comprising steps:
[0081] (1) Deposit and prepare an ITO electrode on the substrate in Example 1;
[0082] (2) On the ITO anode, print PEDOT hole injection layer, TFB hole transport layer, CdSe quantum dot light-emitting layer, ZnO electron transport layer in sequence, and finally evaporate Al cathode to form a flexible QLED device.
[0083] In summary, the present invention provides a substrate and a preparation method thereof, a light-emitting device and a display screen. The substrate provided by the present invention uses a hexagonal boron nitride material with high thermal conductivity and excellent electrical insulation As well as the characteristics of good corrosion resistance and low thermal expansion coefficient, the surface-modified hexagonal boron nitride and cellulose are cross-linked to form a three-dimensional network structure of hexagonal boron nitride / cellulose airgel skeleton, Then, the organic polymer bas...
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Abstract
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