▎ 摘　　要

NOVELTY - Fluorescent perovskite/graphene composite film comprises fluorescent perovskite particles and graphene. The fluorescent perovskite particle is polymer-modified perovskite particles. The polymers are polyesters, polyethylene imines, polystyrenes, polyacrylates, polyethylene glycol, polyvinyl alcohol, polyamino acids, poly (N-vinylpyrrolidone) and polyoxyethylene polyoxypropylene ether. USE - Fluorescent perovskite/graphene composite film used for solar cell and biomedical (claimed). ADVANTAGE - The film has high stability, high fluorescence intensity, simple preparation and strong selectivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of fluorescent perovskite/graphene composite film comprising adding metal salt or organic ammonium halide salt to organic solvent I, adding 0-50% polymer and 0-50% oleic acid, adding metal B halide to organic solvent I, adding 0-20% oleic acid, 0-20% oleylamine and 0.1-50% polymer, dissolving metal B salt, adding hydrazine hydrate to graphene oxide, heating at 80 degrees C for 10 hours, neutralizing reactants, vacuum drying to obtain graphene material, adding distilled water, mixing for 3 seconds to 3 hours at 0-200 degrees C, adding organic solvent II, using fluorescent mineralite/graphene composite solution as electrolytic solution, placing conductive glass and platinum sheet in mineralite/graphene composite solution, performing electrophoretic deposition for 5-10 minutes, removing conductive glass and vacuum drying. The metal salt is halogenated salt of metal A, sulfate, nitrates or carbonates. The metal A is lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, barium, strontium, praseodymium, neodymium, gadolinium or samarium. The metal B is lead, titanium, aluminum, tin, manganese, iron, copper, cobalt, nickel, zinc, rubidium, cadmium, zinc, ruthenium, cadmium, zirconium, palladium, bismuth or silver.