卤化物
铯
离子交换
纳米晶
材料科学
光致发光
胶体
发光
离子
无机化学
光化学
化学
纳米技术
量子点
物理化学
光电子学
有机化学
作者
Georgian Nedelcu,Loredana Proteşescu,Sergii Yakunin,Maryna I. Bodnarchuk,Matthias J. Grotevent,Maksym V. Kovalenko
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-07-28
卷期号:15 (8): 5635-5640
被引量:1927
标识
DOI:10.1021/acs.nanolett.5b02404
摘要
Postsynthetic chemical transformations of colloidal nanocrystals, such as ion-exchange reactions, provide an avenue to compositional fine-tuning or to otherwise inaccessible materials and morphologies. While cation-exchange is facile and commonplace, anion-exchange reactions have not received substantial deployment. Here we report fast, low-temperature, deliberately partial, or complete anion-exchange in highly luminescent semiconductor nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, I). By adjusting the halide ratios in the colloidal nanocrystal solution, the bright photoluminescence can be tuned over the entire visible spectral region (410-700 nm) while maintaining high quantum yields of 20-80% and narrow emission line widths of 10-40 nm (from blue to red). Furthermore, fast internanocrystal anion-exchange is demonstrated, leading to uniform CsPb(Cl/Br)3 or CsPb(Br/I)3 compositions simply by mixing CsPbCl3, CsPbBr3, and CsPbI3 nanocrystals in appropriate ratios.
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