Carbon quantum dot-based fluorescent thin films for LEDs, their preparation methods and applications
By combining biomass carbon sources and organic nitrogen sources with a microwave method to prepare carbon quantum dot thin films, the problems of environmental pollution and low quantum yield have been solved, enabling high-brightness and stable LED applications.
CN122080918APending Publication Date: 2026-05-26SHENZHEN THIN CONDUCTOR TECH CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN THIN CONDUCTOR TECH CO LTD
- Filing Date
- 2025-12-30
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing quantum dot films have environmental pollution problems during preparation and low quantum yield, making it difficult to meet the requirements of high-brightness LEDs.
Method used
A carbon quantum dot solution was prepared by microwave method using biomass carbon source and organic nitrogen source. After being mixed with polyvinyl alcohol with low degree of polymerization, a wet film was formed by ultrasonic spraying and cured at a predetermined temperature to form a fluorescent film with high quantum yield.
Benefits of technology
It achieves high quantum yield (7.2%) and high transmittance (88%), avoids fluorescence quenching, and is suitable for high-brightness and high-stability LED lighting devices and displays.
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Figure CN122080918A_ABST
Abstract
This application relates to the field of fluorescent thin film technology, providing a fluorescent thin film, its preparation method, and its application. The preparation method includes: mixing a biomass carbon source, an organic nitrogen source, and deionized water; subjecting the mixture to microwave heating and then centrifuging and filtering to obtain a carbon quantum dot solution; mixing and stirring the carbon quantum dot solution and a polyvinyl alcohol solution to form a fluorescent ink; uniformly coating the fluorescent ink onto a substrate using ultrasonic spraying to form a wet film; and curing the coated wet film at a predetermined temperature to form a stable thin film. The fluorescent thin film prepared in this application can solve the problem of fluorescence quenching caused by the aggregation of quantum dots, achieving an absolute quantum yield of 7.2%, and is suitable for high-brightness, high-stability LED lighting devices.
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