ONE-STEP SYNTHESIS OF CARBON DOT PHOSPHOR FILM FOR WHITE LED

摘要

In recent years, carbon dots (CDs) have emerged as an intriguing and promising fluorescent material as phosphor for white light-emitting diodes (LEDs) [1, 2]. In order to enlarge the potential application of CDs in white LEDs, the CDs with high quantum yield (QY) of 57.3% and high red-green-blue (RGB) spectral composition of 60.1% were synthesized by one-step hydrothermal method. Citric acid (CA) monohydrate acted as the carbon source and N-(3-(trimethoxysilyl)propyl) ethylenediamine (KH-792) served as the coordinating reagent and passivation additive. Finally, the CD phosphor film, which was directly obtained by a simple heat-treatment of CD solution, was combined with UV chip to achieve white LED. Moreover, the interaction between carbogenic cores and the surface functional groups was investigated using Materials Studio DMol~3 module, so as to understand the photoluminescent (PL) mechanism determined by surface states on CDs.