▎ 摘　　要

NOVELTY - Preparing modified graphene quantum dots involves mixing graphene oxide, hydrogen peroxide and N,N dimethylformamide. The resulting dispersion is subjected to solvothermal reaction to obtain GQDs, mixed the GQDs, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and N-carboxysuccinimide at a pH value of 7-7.5 for activation to obtain the GQDs reaction solution. The GQDs reaction solution is mixed with aminoazobenzene compounds for amidation reaction to obtain a product. USE - Method for preparing modified graphene quantum dots. ADVANTAGE - The method changes the high light transmittance of the visible light region of the optical film itself and absorbs harmful blue light. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. a graphene quantum dot/photocurable resin composite material, which comprises modified graphene quantum dot, resin, photoinitiator and diluent; 2. a polarizer, which comprises an optical film and a graphene quantum dot/photocurable resin composite coating on the surface of the optical film, where coating material of the graphene quantum dot/photocurable resin composite material is formed by the graphene quantum dot/photocurable resin composite material; and 3. a method for preparing polarizer, which involves: a. mixing the modified graphene quantum dots, resin, diluent and photoinitiator to obtain a mixed material; b. coating the obtained mixed material on the surface of the optical film, and curing under ultraviolet light to obtain a product.