Preparation method for quaternary ZnCuInS3 quantum dot with high fluorescence

The invention relates to a preparation method for quaternary ZnCuInS3 with the high fluorescence, which comprises the following steps of: firstly, preparing precursor solution of Zn , Cu and In cations; under the protection of argon, quickly heating the precursor solution to 180-240DEG C from the room temperature; quickly injecting S precursor solution to react for 15-30 minutes; removing a heat source, and naturally cooling to the room temperature; and centrifuging and purifying to obtain the quaternary ZnCuInS3 quantum dot. The obtained quaternary ZnCuInS3 quantum dot has good fluorescence, the fluorescence emission peak position of the quaternary ZnCuInS3 quantum dot is within the range of 645-825nm, and the fluorescence quantum dot productivity is 55-64%. According to the preparation method disclosed by the invention, cheap and nontoxic precursor material is adopted and is synthesized into the quaternary ZnCuInS3 quantum dot with the high fluorescence with a simple thermal injection method, wherein the wavelength of the quaternary ZnCuInS3 quantum dot is 825nm, the quaternary ZnCuInS3 quantum dot can carry out near-infrared luminescence, and the fluorescence quantum dot productivity of the quaternary ZnCuInS3 quantum dot is 55-64%. A foundation is laid for applying the quantum dot to living body bioimaging.