Electrostatically Assembled Carbon Dots/Boron Nitride Nanosheets Hybrid Nanostructures for Thermal Quenching-Resistant White Phosphors

Carbon dots (C-dots) are promising and widely applied carbon fluorescence materials for next-generation white light-emitting diodes (WLEDs). However, nonnegligible thermal quenching issues induced by high working temperature of high-power WLEDs severely limite the further development of C-dots phosphors. In this paper, we report an efficient strategy to improve thermal dissipation within C-dots phosphors to solve the thermal quenching problem. C-dots/hexagonal boron nitride nanosheets (BNNS) hybrid nanostructures have been firstly prepared through electrostatic assembly method. Owing to the effective heat transfer channels established by C-dots/BNNS in polymer matrix, heat could be dissipated efficiently and the working temperature of WLEDs is reduced by 29 °C, suggesting excellent thermal quenching-resistance property. Particularly, the hybrids show thermally stable emission without obviously emission loss up to 100 °C. Moerover, the C-dots/BNNS-WLEDs still maintain a high color rendering index of Ra > 89, revealing that the present strategy could promote the exploration of carbon phosphors with thermal quenching-resistant for high-quality LEDs applications.