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Download fileFrom Nonluminescent Cs4PbX6 (X = Cl, Br, I) Nanocrystals to Highly Luminescent CsPbX3 Nanocrystals: Water-Triggered Transformation through a CsX-Stripping Mechanism
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posted on 2017-08-14, 00:00 authored by Linzhong Wu, Huicheng Hu, Yong Xu, Shu Jiang, Min Chen, Qixuan Zhong, Di Yang, Qipeng Liu, Yun Zhao, Baoquan Sun, Qiao Zhang, Yadong YinWe 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 CsPbX3 NCs 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 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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nonluminescent Cs 4 PbX 6Luminescent CsPbX 3 Nanocrystalsnonpolar phaseNonluminescent Cs 4 PbX 6chemical transformation behaviorchemical transformationnovel CsX-stripping mechanismhalide compositionphotoluminescent quantumstabilization mechanismWater-Triggered Transformationion diffusion propertyperovskite nanocrystalstunable emission wavelengthCsX-Stripping MechanismCs 4 PbX 6 NCsas-prepared CsPbX 3 NCs showCsPbX 3 NCsemission widthpassivated surfaceair-stable CsPbX 3 NCs