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Issue 6, 2018
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Ultrastable, cationic three-dimensional lead bromide frameworks that intrinsically emit broadband white-light

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Abstract

Herein, we report the unusual broadband white-light emission as an intrinsic property from two cationic lead bromide frameworks. This is the first time that the metal halide materials adopting a purely inorganic positively-charged three-dimensional (3D) topology have been synthesized, thus affording highly distorted PbII centers. The single-component white-light emitters achieve an external quantum efficiency of up to 5.6% and a correlated color temperature of 5727 K, producing typical white-light close to that of fluorescent light sources. Unlike the air/moisture-sensitive 3D organolead halide perovskites, our cationic materials are chemically “inert” over a wide range of pH as well as aqueous boiling condition. Importantly, these long-sought ultrastable lead halide materials exhibit undiminished photoluminescence upon continuous UV-irradiation for 30 days under atmospheric condition (∼60% relative humidity, 1 bar). Our mechanistic studies indicate the broadband emission have contributions from the self-trapped excited states through electron-vibrational coupling in the highly deformable and anharmonic lattice, as demonstrated by variable-temperature photoluminescence/absorption spectra as well as X-ray crystallography studies. The chemical robustness and structural tunability of the 3D cationic bromoplumbates open new paths for the rational design of hybrid bulk emitters with high photostability.

Graphical abstract: Ultrastable, cationic three-dimensional lead bromide frameworks that intrinsically emit broadband white-light

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Publication details

The article was received on 20 Sep 2017, accepted on 19 Dec 2017 and first published on 19 Dec 2017


Article type: Edge Article
DOI: 10.1039/C7SC04118G
Citation: Chem. Sci., 2018,9, 1627-1633
  • Open access: Creative Commons BY license
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    Ultrastable, cationic three-dimensional lead bromide frameworks that intrinsically emit broadband white-light

    C. Peng, Z. Zhuang, H. Yang, G. Zhang and H. Fei, Chem. Sci., 2018, 9, 1627
    DOI: 10.1039/C7SC04118G

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