All-inorganic blue light CsPbBr2Cl perovskite quantum dot and preparation method thereof

The invention relates to the technical field of perovskite quantum dot preparation, in particular to an all-inorganic blue-light CsPbBr2Cl perovskite quantum dot and a preparation method thereof. Comprising the following steps: adding a halogen source into a toluene solution, stirring and performing ultrasonic treatment; the preparation method comprises the following steps: mixing a cesium source, lead acetate, dodecylbenzene sulfonic acid and octadecene, and reacting in inert gas to prepare a Cs-DBSA precursor solution; rapidly injecting a toluene solution of halogen atoms into the Cs-DBSA precursor solution, cooling, and terminating the reaction; the chlorine-doped blue light CsPbBr2Cl perovskite quantum dots are purified by adopting methyl acetate. The method has the advantages that strong ligand dodecylbenzene sulfonic acid is introduced, phase separation of mixed halide ions under the action of an electric field is inhibited, and halogen vacancies on the surfaces of the quantum dots are effectively reduc