Quantum dot and preparation method and application thereof

Abstract

The invention provides a quantum dot and a preparation method and application thereof. The quantum dot comprises an InP quantum dot core, a ZnSeS layer coating the surface of the InP quantum dot core and a ZnS layer coating the surface of the ZnSeS layer, wherein the InP quantum dot core is obtained through acid etching. The quantum dot is obtained through acid etching, oxide defects on the surface of the quantum dot can be removed, the quantum dot can be etched into a sphere-like structure, the particle size uniformity of the quantum dot is improved, and the InP quantum dot high in quantum efficiency and narrow in half-peak width is obtained.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a quantum dot and its preparation method and application, in particular to a high-efficiency quantum dot and its preparation method and application. Background technique [0002] Quantum dots are inorganic semiconductor nanocrystals with a diameter of less than 10nm. When the particle size is smaller than or close to the exciton Bohr radius, quantum size effects will appear, that is, as the size of quantum dots gradually decreases, the spectrum of quantum dots will appear blue. shift phenomenon. The smaller the size, the more pronounced the blue shift phenomenon. Therefore, by controlling the size of quantum dots, the width of its energy gap can be adjusted conveniently, thereby controlling the color of the emitted light. [0003] At present, the preparation of II-VI quantum dots has become mature, the quantum yield can reach more than 90%, and the half-peak width is less t...

AI Technical Summary

Problems solved by technology

The main reason may be that the reactivity of the P precursor is too high, so that the growth of InP quantum dots enters the Ostwald ripening stage prematurely, resulting in poor dispersion of quantum dot size.

At the same time, for InP quantum dots, it has a unique tetrahedral structure. Due to its non-spherical structure, the exciton confinement effect of excitons at different positions is very different, which will eventually lead to a wider half-peak width of quantum dots.

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