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Issue 1, 2017
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Atomically thin cesium lead bromide perovskite quantum wires with high luminescence

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Abstract

We report a room-temperature colloidal synthesis of few-unit-cell-thick CsPbBr3 QWs with lengths over a hundred nanometers. The surfactant-directed oriented attachment growth mechanism was proposed to explain the formation of such CsPbBr3 QWs. Owing to the strong quantum confinement effect, the photoluminescence (PL) emission peak of few-unit-cell-thick CsPbBr3 QWs blue-shifted to 430 nm. The ensemble PL quantum yield (PLQY) of the few-unit-cell-thick CsPbBr3 QWs increased to 21.13% through a simple heat-treatment process. The improvement of PLQY was ascribed to the reduction of the density of surface trap states and defect states induced by the heat-treatment process. Notably, the dependence of the bandgap on the diameter with different numbers of unit cells was presented for the first time in 1-D CsPbBr3 QWs on the basis of the produced few-unit-cell-thick CsPbBr3 QWs.

Graphical abstract: Atomically thin cesium lead bromide perovskite quantum wires with high luminescence

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Publication details

The article was received on 20 Oct 2016, accepted on 29 Nov 2016 and first published on 29 Nov 2016


Article type: Communication
DOI: 10.1039/C6NR08250E
Nanoscale, 2017,9, 104-108

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    Atomically thin cesium lead bromide perovskite quantum wires with high luminescence

    H. Huang, M. Liu, J. Li, L. Luo, J. Zhao, Z. Luo, X. Wang, Z. Ye, H. He and J. Zeng, Nanoscale, 2017, 9, 104
    DOI: 10.1039/C6NR08250E

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