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Issue 6, 2017
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Structural origins of broadband emission from layered Pb–Br hybrid perovskites

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Abstract

Through structural and optical studies of a series of two-dimensional hybrid perovskites, we show that broadband emission upon near-ultraviolet excitation is common to (001) lead-bromide perovskites. Importantly, we find that the relative intensity of the broad emission correlates with increasing out-of-plane distortion of the Pb–(μ-Br)–Pb angle in the inorganic sheets. Temperature- and power-dependent photoluminescence data obtained on a representative (001) perovskite support an intrinsic origin to the broad emission from the bulk material, where photogenerated carriers cause excited-state lattice distortions mediated through electron–lattice coupling. In contrast, most inorganic phosphors contain extrinsic emissive dopants or emissive surface sites. The design rules established here could allow us to systematically optimize white-light emission from layered hybrid perovskites by fine-tuning the bulk crystal structure.

Graphical abstract: Structural origins of broadband emission from layered Pb–Br hybrid perovskites

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Publication details

The article was received on 10 Apr 2017, accepted on 17 Apr 2017 and first published on 24 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC01590A
Citation: Chem. Sci., 2017,8, 4497-4504
  • Open access: Creative Commons BY license
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    Structural origins of broadband emission from layered Pb–Br hybrid perovskites

    M. D. Smith, A. Jaffe, E. R. Dohner, A. M. Lindenberg and H. I. Karunadasa, Chem. Sci., 2017, 8, 4497
    DOI: 10.1039/C7SC01590A

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