Preparation and application of carbon dots@cyanuric acid composites with aggregation-induced emission effect

Carbon dots (CDs) with aggregation-induced emission (AIE) effect can effectively solve the problem of weak fluorescence of solid CDs due to aggregation-caused quenching (ACQ) effect. A kind of carbon dots@cyanuric acid composites (CDs@CYA) with AIE effect was reported in this paper, which is prepared by one-step microwave-assisted method using low-toxicity and low-cost imidazole, urea and tartaric acid as precursors. The AIE effect of CDs@CYA is derived from the restriction of intramolecular motion of the imidazole and cyanuric acid (CYA) groups on the surface of CDs in the aggregation state and convert non-radiative energy into radiative energy, as is verified by control variable experiments. CDs@CYA aqueous solution was used in fluorescent anti-counterfeiting ink, light conversion film (LCF), fluorescent probe and biological imaging. CDs@CYA powder was encapsulated on the blue chip with red phosphor by epoxy resin to obtain a white light-emitting diode (LED) device with a color coordinate of (0.33, 0.28), a color temperature of 5558 K and a color rendering index of 76.4.