高荧光效率深红色硒化镉核壳量子点的制备

Preparation of high luminescent efficiency deep-red CdSe/ZnCdS quantum dots

采用二次注入镉前驱体的方法,以十八烯(ODE)为溶剂,通过优化前驱体注入速度、摩尔比等实验条件,抑制量子点(QDs)生长的奥斯瓦尔德熟化过程,制备出粒径7.5nm以上,发光效率在15%左右的硒化镉(CdSe)QDs核;通过对制备的QDs核进行包覆,形成了CdSe/ZnCdS的核壳结构;获得了单分散性的荧光波长大于660nm且发光效率高达43%的深红光QDs。所制备的QDs有望在生物影像和植物工厂等领域得到应用。

CdSe cores with the particle size over 7.5nm are successfully synthesized by means of twosteps injection of the Cd precursor.Efforts are made to restrain the Ostwald ripening process during the quantum dots grown up.With optimized synthesis conditions,such as the injection speed and molar ratio of precursor,the prepared CdSe cores show zinc blend structure with larger core size.Though the luminous efficiency of the prepared core is 15%,the efficiency increases drastically up to 43%after forming the ZnCdS shell on the core.Conditions of shell coating are also been optimized,and the obtained quantum dots with emission wavelength exceeded 660 nm.The obtained deep-red QDs with high efficiency and optical stability are expected to find their application in the field of plant′s illumination.