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Issue 45, 2018
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Realization of “warm” white light via halide substitution in polar two-dimensional hybrid perovskites (2meptH2)PbClxBr4−x

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Abstract

Broadband white-light emissive two-dimensional (2D) metal halide perovskites have attracted increasing attention in solid-state optical applications. Herein, we present a family of polar 2D hybrid perovskites, (2meptH2)PbClxBr4−x (2mept = 2-methyl-1,5-diaminopentane, x = 0–4), which emit intrinsic broadband emissions with tunable photoluminescence from “cold” white light to “warm” white light. Importantly, a high-performance “warm” white light with a correlated colour temperature of 3958 K and an excellent colour rendering index of 84 was successfully realized in (2meptH2)PbCl4, making it ideal for indoor lighting applications. Mechanistic studies disclose that the broadband white-light emissions are attributed to self-trapped excitons stemming from the strong electron–phonon coupling in the distorted structure, which reasonably explained the emission changes in the mixed-halide perovskites. Such halide substitution inducing high tunability in white-light emissions provides a deep understanding on the underlying structure–property relationship, and further conducts the design of desirable white-light emissive materials.

Graphical abstract: Realization of “warm” white light via halide substitution in polar two-dimensional hybrid perovskites (2meptH2)PbClxBr4−x

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Publication details

The article was received on 28 Jun 2018, accepted on 18 Sep 2018 and first published on 20 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03167C
Citation: J. Mater. Chem. C, 2018,6, 12267-12272
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    Realization of “warm” white light via halide substitution in polar two-dimensional hybrid perovskites (2meptH2)PbClxBr4−x

    S. Wang, Y. Yao, Z. Wu, Y. Peng, L. Li and J. Luo, J. Mater. Chem. C, 2018, 6, 12267
    DOI: 10.1039/C8TC03167C

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