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Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9

Bass, KK; Estergreen, L; Savory, CN; Buckeridge, J; Scanlon, DO; Djurovich, PI; Bradforth, SE; ... Melot, BC; + view all (2017) Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9. Inorganic Chemistry , 56 (1) pp. 42-45. 10.1021/acs.inorgchem.6b01571. Green open access

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Abstract

We report a study on the optical properties of the layered polymorph of vacancy-ordered triple perovskite Cs3Bi2Br9. The electronic structure, determined from density functional theory calculations, shows the top of the valence band and bottom of the conduction band minima are, unusually, dominated by Bi s and p states, respectively. This produces a sharp exciton peak in the absorption spectra with a binding energy that was approximated to be 940 meV, which is substantially stronger than values found in other halide perovskites and, instead, more closely reflects values seen in alkali halide crystals. This large binding energy is indicative of a strongly localized character and results in a highly structured emission at room temperature as the exciton couples to vibrations in the lattice.

Type: Article
Title: Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.inorgchem.6b01571
Publisher version: http://doi.org/10.1021/acs.inorgchem.6b01571
Language: English
Additional information: © 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/ipdf/10.1021/acs.inorgchem.6b01571
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1518039
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