| abstract |
Provided is a method for preparing a nano crystal having a core-shell structure, comprising the following steps: providing a quantum dot core; growing a shell layer N times on the surface of the quantum dot core to prepare N shell layers, so as to obtain a nano crystal having a core-shell structure, wherein a crust cation precursor used to grow the shell layer is a metal organic carboxylate; and adding, between M adjacent shell layer growth steps in different orders, an organic amine to a shell layer growth reaction system that has formed a previous shell layer, performing mixing and heating, and then growing a subsequent shell layer, where N is a positive integer greater than or equal to 2, M is a positive integer, and the value of M satisfies N / 3 ≤ M ≤ N – 1. |