A method for preparing nanocrystals is disclosed. The method includes synthesizing colloidal semiconductor nanocrystal cores, and adding a metal salt to the colloidal semiconductor nanocrystal cores and heating the mixture while maintaining the reaction temperature constant. During the reaction, the surfaces of the semiconductor nanocrystal cores are etched (‘in-situ etching’) and metal-surfactant layers are formed on the etched surface portions of the semiconductor nanocrystal cores. The metal-surfactant layers are derived from the metal salt. Nanocrystals prepared by the method have minimal surface defects and exhibit high luminescence efficiency and good stability.
公开了一种制备纳米晶体的方法。该方法包括合成胶体半导体纳米晶体核,将
金属盐加入到胶体半导体纳米晶体核中,并在保持反应温度恒定的情况下加热混合物。在反应过程中,半导体纳米晶体核的表面被蚀刻(“原位蚀刻”),并在半导体纳米晶体核的蚀刻表面部分形成
金属表面活性剂层。
金属表面活性剂层来自
金属盐。通过该方法制备的纳米晶体具有最小的表面缺陷,表现出高发光效率和良好的稳定性。