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Issue 31, 2017
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Crystal structure and electron transition underlying photoluminescence of methylammonium lead bromide perovskites

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Abstract

Bromine-based methylammonium lead hybrid perovskites (CH3NH3PbBr3 or MAPbBr3) have 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 systematic analysis of the stable-state, transient-state and temperature-dependent spectra demonstrated the structure–activity relationship between optical properties and crystal phase. The lattice symmetry was also confirmed by the two-photon absorption induced PL. The findings can be assigned to the fact that the two emission states with band-energy ∼2.22 eV and ∼2.31 eV are originated from free exciton and free carrier recombination which are attributed to the coexistence of a non-centrosymmetric tetragonal phase and a centrosymmetric cubic phase for CH3NH3PbBr3 microcrystals at higher temperature (>160 K).

Graphical abstract: Crystal structure and electron transition underlying photoluminescence of methylammonium lead bromide perovskites

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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, 2017,5, 7739-7745
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    Crystal structure and electron transition underlying photoluminescence of methylammonium lead bromide perovskites

    F. Chen, C. Zhu, C. Xu, P. Fan, F. Qin, A. Gowri Manohari, J. Lu, Z. Shi, Q. Xu and A. Pan, J. Mater. Chem. C, 2017, 5, 7739
    DOI: 10.1039/C7TC01945A

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