Structural origins of broadband emission from layered Pb-Br hybrid perovskites

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 ou...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2017, Vol.8 (6), p.4497-4504
Main Authors: Smith, Matthew D, Jaffe, Adam, Dohner, Emma R, Lindenberg, Aaron M, Karunadasa, Hemamala I
Format: Article
Language:English
Subjects:
Broadband
Chemistry
Distortion
Emission
Emissivity
Excitation
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Origins
Perovskites
White light
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Summary: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.
ISSN:2041-6520
2041-6539
DOI:10.1039/c7sc01590a