Structural Diversity in White-Light-Emitting Hybrid Lead Bromide Perovskites

Journal of the American Chemical Society
Lingling MaoMercouri G Kanatzidis

Abstract

Hybrid organic-inorganic halide perovskites are under intense investigations because of their astounding physical properties and promises for optoelectronics. Lead bromide and chloride perovskites exhibit intrinsic white-light emission believed to arise from self-trapped excitons (STEs). Here, we report a series of new structurally diverse hybrid lead bromide perovskites that have broad-band emission at room temperature. They feature Pb/Br structures which vary from 1D face-sharing structures to 3D corner- and edge-sharing structures. Through single-crystal X-ray diffraction and low-frequency Raman spectroscopy, we have identified the local distortion level of the octahedral environments of Pb2+ within the structures. The band gaps of these compounds range from 2.92 to 3.50 eV, following the trend of "corner-sharing < edge-sharing < face-sharing". Density functional theory calculations suggest that the electronic structure is highly dependent on the connectivity mode of the PbBr6 octahedra, where the edge- and corner-sharing 1D structure of (2,6-dmpz)3Pb2Br10 exhibits more disperse bands and smaller band gap (2.49 eV) than the face-sharing 1D structure of (hep)PbBr3 (3.10 eV). Using photoemission spectroscopy, we measured the e...Continue Reading

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Citations

Feb 19, 2019·Advanced Materials·Romain GautierMichael Paris
Nov 5, 2019·Chemical Communications : Chem Comm·Natalie DehnhardtJohanna Heine
Jul 11, 2020·Angewandte Chemie·Daiki UmeyamaHemamala Karunadasa
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Mar 18, 2021·Reports on Progress in Physics·Ziming ChenHin-Lap Yip
Apr 28, 2021·Journal of the American Chemical Society·Ioannis SpanopoulosMercouri G Kanatzidis
Jul 15, 2021·Advanced Science·Hailong YuanRomain Gautier
Jul 10, 2021·Inorganic Chemistry·Mingyang LiQuanlin Liu
Jul 29, 2021·Chemical Communications : Chem Comm·Hui PengBingsuo Zou
Aug 7, 2021·Journal of the American Chemical Society·Ruiyang LyuYiying Wu
Apr 14, 2020·Journal of the American Chemical Society·Lingling MaoMercouri G Kanatzidis
May 6, 2020·The Journal of Physical Chemistry Letters·Pengfei ShenYongjae Lee
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Feb 6, 2020·The Journal of Physical Chemistry Letters·Gaomin SongZheshuai Lin
Apr 14, 2020·Journal of the American Chemical Society·Ioannis SpanopoulosMercouri G Kanatzidis
Nov 7, 2018·Journal of the American Chemical Society·Lingling MaoMercouri G Kanatzidis

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