张桥教授课题组与孙宝全教授课题组、美国加州大学河滨分校殷亚东教授课题组合作在Nano Letters上发表论文

发布时间:2017-11-24访问量:16设置

题目:From Nonluminescent Cs4PbX6  (X = Cl, Br, I) Nanocrystals to Highly Luminescent CsPbX3  Nanocrystals: Water-Triggered Transformation through a CsX-Stripping  Mechanism

作者:

Linzhong Wu, Huicheng Hu, Yong Xu†‡, Shu Jiang, Min Chen, Qixuan Zhong, Di Yang, Qipeng Liu†, Yun Zhao, Baoquan Sun*† , Qiao Zhang*†, and Yadong Yin*‡

单位:

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren’ai Road,  Suzhou, 215123, Jiangsu People’s Republic of China

Department of Chemistry, University of California, Riverside, Riverside, California 92521 United States

摘要:

We report a novel CsX-stripping mechanism that enables the efficient chemical transformation of nonluminescent Cs4PbX6 (X = Cl, Br, I) nanocrystals (NCs) to highly luminescent CsPbX3 NCs. During the transformation, Cs4PbX6 NCs dispersed in a nonpolar solvent are converted into CsPbX3 NCs by stripping CsX through an interfacial reaction with water in a different phase. This process takes advantage of the high solubility of CsX in water as well as the ionic nature   and high ion diffusion property of Cs4PbX6 NCs, and  produces monodisperse and air-stable CsPbX3NCs with controllable halide composition, tunable emission wavelength covering the full visible range, narrow emission width, and high photoluminescent quantum yield (up to 75%). An additional advantage is that this is a clean synthesis as Cs4PbX6  NCs are converted into CsPbX3NCs in the nonpolar phase while the by product of CsX is formed in water that could be easily separated from the organic phase. The as-prepared CsPbX3 NCs show enhanced stability against moisture because of the passivated surface. Our finding not only provides a new pathway for the preparation of highly luminescent CsPbX3 NCs but also adds insights into the chemical transformation behavior and  stabilization mechanism of these emerging perovskite nanocrystals.

影响因子:

12.712

分区情况:

一区

链接:

http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b02896

  

责任编辑:向丹婷

 

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