Preparation method of quantum dots

Abstract

The invention provides a preparation method of quantum dots. The preparation method comprises the following steps: providing an initial quantum dot core, and mixing the initial quantum dot core and anorganic carboxylic acid to combine the organic carboxylic acid to the surface of the initial quantum dot core; preparing a shell layer on the surface of the initial quantum dot core, wherein the stepfor preparing the shell layer on the surface of the initial quantum dot core is carried out in a shell layer growth reaction system containing an organic carboxylic acid; mixing the solution system after the shell growth reaction and an organic amine, and complexing the organic amine and the residual cationic precursor shell; or mixing the system after the shell growth reaction and organic phosphine, and heating; or mixing the solution system after the shell growth reaction and a mixed solution of an organic amine and organic phosphine, and heating.

Description

technical field

[0001] The invention belongs to the technical field of preparation of nanocrystalline materials, and in particular relates to a preparation method of quantum dots. Background technique

[0002] Nanoscience and nanotechnology are emerging science and technology and have potential application value and economic benefits, so they have attracted the attention of scientists all over the world. Compared with bulk materials, nanocrystals (NCs) can exhibit electrical, optical, magnetic, and electrochemical properties that bulk materials do not possess. Semiconductor nanocrystals, also known as quantum dots (QD), range in size from 1 to 20nm. When the particle size changes, the bandgap valence band and conduction band of semiconductor nanocrystals will also change (quantum size effect), such as CdSe The absorption and emission of nanocrystals cover almost the entire visible spectral range, thus, semiconductor nanocrystals exhibit the phenomenon of size-dependent phot...