PREPARATION METHOD OF INDIUM PHOSPHIDE QUANTUM DOT (InP QD) WITH LARGE STOKES SHIFT

A preparation method of an indium phosphide quantum dot (InP QD) with a large Stokes shift, comprising the following steps:

• S1:
• mixing an indium precursor, a zinc precursor, and a coordination solvent to obtain an indium and zinc precursor solution;
• S2:
• controlling the indium and zinc precursor solution obtained in the S1 to a first temperature, adding a phosphorus precursor, and heating to a second temperature and holding the second temperature to obtain an indium phosphide (InP) core solution, wherein the first temperature is 50° C. to 80° C. and the second temperature is 150° C. to 180° C.;
• S3:
• adding a shell precursor to the InP core solution obtained in the S2, and heating to a third temperature and holding the third temperature to obtain an InP QD solution with an intermediate shell, wherein the third temperature is 290° C. to 320° C.;
• and
• S4:
• adding an anionic precursor and a cationic precursor successively to the InP QD solution obtained in the S3, and holding the third temperature to obtain the InP QD with the intermediate shell, an outer shell and the large Stokes shift.