▎ 摘　　要

NOVELTY - The material comprises o-phenylenediamine which is used as a carbon source, organic acid as a regulator, in an ethanol solvent, at 150-200 degrees C, by hydrothermal growth for 10-15 hours, respectively, blue color, green, orange, red, white fluorescent graphene quantum dots. The dots take out and filter with a 220nm filter membrane to obtain a black solution with a large number of graphene quantum dots stably dispersed after the reaction is naturally cooled to room temperature. The product is concentrated to one-third of its original volume with a rotary evaporator, and is filtered with a 220nm filter membrane, take out the filtered filtrate, and mix the filtered filtrate with silica gel in a certain proportion. The product is stirred with a homogenizer for 15 minutes to obtain a composite of graphene quantum dots and silica gel. The graphene quantum dot silica gel composite is dropped on the LED chip of the corresponding wavelength, so that a white light LED device is prepared. USE - Graphene quantum dot composite material for preparing colorful smart white LED devices. ADVANTAGE - The multicolor fluorescent graphene quantum dots are prepared by a one-step hydrothermal method by selecting cheap and industrially produced aniline as the precursor. The multi-color fluorescent graphene quantum dots are adjusted to produce 16 color fluorescent devices and cold, warm and standard white light LED devices, which has considerable commercial application prospects. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the glue homogenizing machine. Structure (1) Base (3) Collecting liquid container (4) Processing component (5) Sealing cover plate (6)