▎ 摘　　要

NOVELTY - Preparing highly fluorescent boron-nitrogen co-doped graphene quantum dots by one-pot hydrothermal method comprises taking citric acid as carbon source, urea as nitrogen source and borax as boron source, then completely dissolving in ultrapure water, placing in high-pressure kettle, and carrying out hydrothermal reaction at 180-200 degrees C for 1.5-2 hours, and cooling to room temperature to obtain aqueous solution of boron-nitrogen co-doped graphene quantum dots in brownish black color, then dialyzing aqueous solution of boron-nitrogen co-doped graphene quantum dots in 3000 Da dialysis bag for 1-2 days, concentrating dialyzed aqueous solution of boron-nitrogen co-doped graphene quantum dots by rotary evaporation, and drying to obtain brown-green high-fluorescent boron-nitrogen co-doped graphene quantum dot powder. USE - The highly fluorescent boron-nitrogen co-doped graphene quantum dots is useful in fluorescence sensors, biological imaging, optoelectronic devices and other aspects. ADVANTAGE - The quantum dots have high crystallinity, strong water solubility, narrow lateral size distribution, low biological toxicity, high biocompatibility and excellent luminescence behavior. The method has simple process, strong controllability and high quantum yield.