期刊
NANO LETTERS
卷 17, 期 9, 页码 5799-5804出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02896
关键词
Cesium lead halide; nanocrystal; chemical transformation; Cs4PbX6; CsPbX3; perovskite
类别
资金
- National Natural Science Foundation of China [21401135, 21673150]
- Ministry of Science and Technology of China [2016YFE0129600]
- Natural Science Foundation of Jiangsu Province [BK20140304]
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- SWC for Synchrotron Radiation Research
- American Chemical Society Petroleum Research Fund
We report a novel CsX-stripping mechanism that enables the efficient chemical transformation of non luminescent 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 m-onodisperse and air-stable CsPbX3 NCs with controllable halide composition, tunable emission wavelength covering the full visible range, narrow emission width, and high pheotoluminescent quantum yield (up to 75%). An additional advantage is that this is a clean synthesis as Cs4PbX6 NCs are converted into CsPbX3 NCs in the nonpolar phase while the byproduct 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.
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