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Crystal Structure and Electron Transition Underlying Photoluminescence of Methylammonium Lead Bromide Perovskite

Abstract

Bromine-based methylammonium lead hybrid perovskite (CH3NH3PbBr3 or MAPbBr3) has been exhibited remarkable charge transport and optical properties. Nonetheless, the photoluminescence (PL) behavior and electronic transition state are still obscure. In this paper, the intrinsic emission mechanisms of two peaked CH3NH3PbBr3 microcuboid crystals have been investigated. A systematical analysis on stable-state, transient-state and temperature-dependent spectra demonstrated the structure-activity relationship between optical properties and crystal phase. The lattice symmetry also confirmed by the two-photon absorption induced PL. The findings can be assigned that the two emission states with band-energy ~2.22 eV and ~2.31 eV are originated from free excitons and free carriers recombination which attributed to coexistence of non-centrosymmetric tetragonal phase and centrosymmetric cubic phase for CH3NH3PbBr3 microcrystal at higher temperature (>160 K).

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Publication details

The article was received on 05 May 2017, accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01945A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Crystal Structure and Electron Transition Underlying Photoluminescence of Methylammonium Lead Bromide Perovskite

    F. Chen, C. Zhu, C. Xu, P. Fan, F. Qin, A. G. Manohari, J. Lu, Z. Shi, Q. Xu and A. Pan, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01945A

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