The invention relates to a preparation method of CdZnSeS
quantum dots. The preparation method comprises the following steps: (1) evenly mixing
zinc sources,
selenium sources and
organic solvent, leading in
shielding gas, and heating to 220-290 DEG C; or evenly mixing inorganic
zinc compounds, the
zinc sources,
fatty acid and the
organic solvent, leading in the
shielding gas, and heating to 220-290 DEG C; (2) slowly adding
cadmium sources dropwise, monitoring wavelengths of
fluorescence emission peaks of intermediate products in real time, and stopping adding the
cadmium sources dropwise when the wavelengths of the
fluorescence emission peaks of target products are achieved; (3) slowly adding stoichiometric
sulfur sources or mixed liquid of the
sulfur sources and the zinc sources dropwise; and (4) reacting for 0.5-24h at 220-290 DEG C to obtain the CdZnSeS
quantum dots with different emission wavelengths. The preparation method of the CdZnSeS
quantum dots is simple to operate, the reaction process is continuous and stable, a rapid injection method is not required, the requirements for production equipment are lowered, and the
reaction temperature is low.
Fluorescence emission spectrums of the products can be controlled by adjusting addition amount of the
cadmium sources according to real-time monitoring results.