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Issue 41, 2020
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Single-emissive-layer all-perovskite white light-emitting diodes employing segregated mixed halide perovskite crystals

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Abstract

Metal halide perovskites have demonstrated impressive properties for achieving efficient monochromatic light-emitting diodes. However, the development of white perovskite light-emitting diodes (PeLEDs) remains a big challenge. Here, we demonstrate a single-emissive-layer all-perovskite white PeLED using a mixed halide perovskite film as the emissive layer. The perovskite film consists of separated mixed halide perovskite phases with blue and red emissions, which are beneficial for suppressing halide anion exchange and preventing charge transfer. As a result, the white PeLED shows balanced white light emission with Commission Internationale de L'Eclairage coordinates of (0.33, 0.33). In addition, we find that the achievement of white light emission from mixed halide perovskites strongly depends on effective modulation of the halide salt precursors, especially lead bromide and benzamidine hydrochloride in our case. Our work provides very useful guidelines for realizing single-emissive-layer all-perovskite white PeLEDs based on mixed halide perovskites, which will spur the development of high-performance white PeLEDs.

Graphical abstract: Single-emissive-layer all-perovskite white light-emitting diodes employing segregated mixed halide perovskite crystals

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Supplementary files

Article information


Submitted
17 Aug 2020
Accepted
24 Sep 2020
First published
25 Sep 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 11338-11343
Article type
Edge Article

Single-emissive-layer all-perovskite white light-emitting diodes employing segregated mixed halide perovskite crystals

H. Yu, H. Wang, G. Pozina, C. Yin, X. Liu and F. Gao, Chem. Sci., 2020, 11, 11338
DOI: 10.1039/D0SC04508J

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