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

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 excellent colour rendering index of 84 was successfully realized in (2meptH2)PbCl4, making it ideal for indoor lighting applications. Mechanism studies disclose that the broadband white-light emissions are attributed to self-trapped excitons stemming from strong electron–phonon coupling in the distorted structure, which reasonably explained the emission changes of the mixed-halide perovskites. Such halide substitution induced high tunability of white-light emissions provide a deep understanding on underlying structure-properties relationship, and further conduct the design of desirable white-light emissive materials.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8TC03167C

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