Quantum confinement luminescence of trigonal cesium lead bromide quantum dots
Quantum confinement luminescence of trigonal cesium lead bromide quantum dots
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三角溴化铯铅量子点的量子限域发光
DOI:
10.1016/j.apsusc.2018.10.014
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发表时间:
2019-02
影响因子:
6.7
通讯作者:
Jiyang Fan
中科院分区:
文献类型:
--
作者:
Yumeng Zhang;Yuanyuan Li;Yuzhen Liu;Hongxia Li;Jiyang Fan
Cesium lead halides are novel and superior optoelectronic materials. Unlike the cases of the widely investigated cubic CsPbXr3(X = Cl, Br, or I) nanocrystals, people know little about the optical properties of the “zero-dimensional perovskite” Cs4PbX6nanocrystals. We study the photoluminescence properties of the Cs4PbBr6quantum dots (QDs) with sizes of only a few nanometers. They exhibit stable wavelength-tunable (from 340 to 378 nm) luminescence stemming from quasi-self-trapped excitons. The spectral characterizations in conjunction with first-principles calculations reveal there is remarkable quantum confinement effect in the Cs4PbBr6QDs. The large exciton binding energy obtained from both calculation and experiment explains why the trigonal Cs4PbX6QDs have strong exciton-related absorption and emission at room temperature. This family of wide-gap trigonal cesium lead halide QDs with intrinsic near-UV luminescence have potential applications in short-wavelength photonic nanodevices.
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影响因子:
2.8
作者:
Nikl, M;Mihokova, E;Zazubovich, S
通讯作者:
Zazubovich, S
影响因子:
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