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|Title:||Polaron self-localization in white-light emitting hybrid perovskites||Authors:||Cortecchia, Daniele
Lo, Shu-Zee Alencious
Gurzadyan, Gagik G.
White-light emitting perovskites
|Issue Date:||2017||Source:||Cortecchia, D., Yin, J., Bruno, A., Lo, S.-Z. A., Gurzadyan, G. G., Mhaisalkar, S., et al. (2017). Polaron self-localization in white-light emitting hybrid perovskites. Journal of Materials Chemistry C, 5(11), 2771-2780.||Series/Report no.:||Journal of Materials Chemistry C||Abstract:||Two-dimensional (2D) perovskites with the general formula APbX4 are attracting increasing interest as solution processable, white-light emissive materials. Recent studies have shown that their broadband emission is related to the formation of intra-gap colour centres. Here, we provide an in-depth description of the charge localization sites underlying the generation of such radiative centres and their corresponding decay dynamics, highlighting the formation of small polarons trapped within their lattice distortion field. Using a combination of spectroscopic techniques and first-principles calculations to study the white-light emitting 2D perovskites (EDBE)PbCl4 and (EDBE)PbBr4, we infer the formation of Pb23+, Pb3+, and X2- (where X ＝ Cl or Br) species confined within the inorganic perovskite framework. Due to strong Coulombic interactions, these species retain their original excitonic character and form self-trapped polaron–excitons acting as radiative colour centres. These findings are expected to be relevant for a broad class of white-light emitting perovskites with large polaron relaxation energy.||URI:||https://hdl.handle.net/10356/82288
|ISSN:||2050-7526||DOI:||10.1039/C7TC00366H||Rights:||© 2017 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Materials Chemistry C, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1039/C7TC00366H].||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||ERI@N Journal Articles|
IGS Journal Articles
SPMS Journal Articles
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