Methods for forming nanocrystals with position-controlled dopants

摘要

A doping method using a three-step synthesis to make high-quality doped nanocrystals is provided. The first step includes synthesizing starting host particles. The second step includes dopant growth on the starting host particles. The third step includes final shell growth. In one embodiment, this method can be used to form Mn-doped CdS/ZnS core/shell nanocrystals. The Mn dopant can be formed inside the CdS core, at the core/shell interface, and/or in the ZnS shell. The subject method allows precisely controlling the impurity radial position and doping level in the nanocrystals.

主权项

1. A method for doping nanocrystals, comprising the steps of:
synthesizing a starting host particle having a first radius; incorporating impurity atoms onto a surface of the starting host particle in the presence of doping precursors to form a doped starting host particle; purifying the doped starting host particle by removing unreacted dopants from the doped starting host particle to form a purified doped starting host particle; and growing a host shell around the purified doped starting host particle to form a doped nanocrystal having a second radius, wherein the impurity atoms are radial-positioned at the first radius.