Metal Coordination Sphere Deformation Induced Highly Stokes-Shifted, Ultra Broadband Emission in 2D Hybrid Lead-Bromide Perovskites and Investigation of Its Origin

Febriansyah, B., Borzda, T., Cortecchia, D. , Neutzner, S., Folpini, G., Koh, T.M., Li, Y., Mathews, N., Petrozza, A. and England, Jason (2020) Metal Coordination Sphere Deformation Induced Highly Stokes-Shifted, Ultra Broadband Emission in 2D Hybrid Lead-Bromide Perovskites and Investigation of Its Origin. Angewandte Chemie - International Edition, 59 (27). pp. 10791-10796. ISSN 1433-7851

Full content URL: https://doi.org/10.1002/anie.201915708

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Metal Coordination Sphere Deformation Induced Highly Stokes-Shifted, Ultra Broadband Emission in 2D Hybrid Lead-Bromide Perovskites and Investigation of Its Origin
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Abstract

Published studies of layered (2D) (100)-oriented hybrid lead-bromide perovskites evidence a correlation between increased inter-octahedral (Pb-Br-Pb) distortions and the appearance of broadband white light emission. However, the impact of distortions within their constituent [PbBr6]4- octahedra has yet to be assessed. Herein, we report two new (100)-oriented 2D Pb-Br perovskites, whose structures display unusually high intra-octahedral distortions, whilst retaining minimal inter-octahedral distortions. Using a combination of temperature-dependent, power-dependent and time-resolved photoluminescence spectroscopic measurements, we show that increased intra-octahedral distortion induces exciton localization processes and leads to formation of multiple photoinduced emissive colour centres. Ultimately, this leads to highly Stokes-shifted, ultrabroad white light emission at room temperature.

Keywords:Bromine compounds, Color centers, Perovskite, Photoluminescence, Exciton localization, Metal coordination spheres, Octahedral distortion, Spectroscopic measurements, Temperature dependent, Time-resolved photoluminescence, Ultra-broadband emissions, White light emission, Lead compounds
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F120 Inorganic Chemistry
F Physical Sciences > F360 Optical Physics
Divisions:College of Science > School of Chemistry
ID Code:51892
Deposited On:04 Oct 2022 09:06

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