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ACS Appl Mater Interfaces. 2018 May 9;10(18):15980-15987. doi: 10.1021/acsami.8b00048. Epub 2018 Apr 25.

High Color Rendering Index White-Light Emission from UV-Driven LEDs Based on Single Luminescent Materials: Two-Dimensional Perovskites (C6H5C2H4NH3)2PbBr xCl4- x.

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Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science , Fujian Normal University , Fuzhou 350007 , China.
Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China.


Two-dimensional (2D) white-light-emitting hybrid perovskites (WHPs) are promising active materials for single-component white-light-emitting diodes (WLEDs) driven by UV. However, the reported WHPs exhibit low quantum yields (≤9%) and low color rendering index (CRI) values less than 85, which does not satisfy the demand of solid-state lighting applications. In this work, we report a series of mixed-halide 2D layered WHPs (C6H5C2H4NH3)2PbBr xCl4- x (0 < x < 4) obtained from the phenethylammonium cation. Unlike the reported WHPs including (C6H5C2H4NH3)2PbCl4, the mixed-halide perovskites display morphology-dependent white emission for the different extents of self-absorption. Additionally, the amount of Br has a huge influence on the photophysical properties of mixed-halide WHPs. With the increasing content of Br, the quantum yields of WHPs increase gradually from 0.2 to 16.9%, accompanied by tunable color temperatures ranging from 4000 K ("warm" white light) to 7000 K ("cold" white light). When applied to the WLEDs, the mixed-halide perovskite powders exhibit tunable white electroluminescent emission with very high CRI of 87-91.


2D perovskite; LED; mixed halide; single-component; white-light emission


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