Preparing method for CdSe/CdZnSeS/ZnS core-shell quantum dots

Abstract

The invention provides a preparing method for CdSe / CdZnSeS / ZnS core-shell quantum dots. The preparing method is simple in synthesis method, short in synthesis time and high in quantum efficiency and stability, and is characterized by including the following steps that (1) zinc sources, cadmium sources, an organic solvent and organic ligand are mixed and stirred to be even, then the mixture is heated to be at the temperature of 260 DEG C to 320 DEG C, and protection gas is introduced into the whole reaction process; (2) in the stirring state, a selenium precursor and a sulfur precursor which are mixed to be even are rapidly injected; (3) after the precursors in the step (2) are completely injected, timing is started, and in 0 s to 30 s, the sulfur precursor is injected again; (4) at the temperature of 260 DEG C to 300 DEG C, the mixture is reacted for 1 min to 60 min. The preparing method for the CdSe / CdZnSeS / ZnS core-shell quantum dots has the advantages that CdZnSeS serves as a medium and is connected with a core CdSe and a shell CdS, the lattice matching performance between the cores and the shell layers of the quantum dots is high, the light stability and the heat stability between the cores and the shell layers of the quantum dots are quite high, and the yield of quantum can be 80% or above. The preparing method is simple in synthesis step, easy to operate and capable of facilitating large-scale production.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing nanometer quantum dots. Background technique [0002] Quantum dots are semiconductor nanocrystals with a size of several nanometers, which have obvious quantum size effects and unique optical properties. When stimulated by light or electricity, quantum dots will emit light of a certain wavelength, and the emission wavelength is determined by the composition, size and shape of quantum dots. Compared with organic materials, quantum dots can provide excellent color purity and thermal stability. These characteristics make quantum dots have attracted widespread attention for their potential applications in the fields of lighting, display, solar energy, and biomarkers. [0003] At present, the synthesis of efficient and stable quantum dots is mostly achieved by coating the surface of the luminescent core with an organic or inorganic layer, such...

AI Technical Summary

Problems solved by technology

It increases the efficiency and stability of quantum dots to a certain extent, but there is still room for improvement in efficiency and stability, and the synthesis steps are numerous and complicated, which is not conducive to large-scale production and greatly limits the application of quantum dots

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