Issue 10, 2019

Influence of a lecithin additive on the performance of all-inorganic perovskite light-emitting diodes

Abstract

All-inorganic halide perovskites with superior optoelectronic properties are promising materials for efficient perovskite light-emitting diodes. However, they usually suffer from a large grain size (hundreds of nanometers), high surface roughness and poor stability during the spin coating process. Here, we report a facile strategy to fabricate a uniform and flat CsPbBr3 film. A small amount of lecithin (LE) introduced into CsPbBr3 precursor solution can promote the formation of small CsPbBr3 grains that remarkably improve the uniformity of perovskite films with a surface roughness of about 2.2 nm. Furthermore, the CsPbBr3–LE films display excellent fluorescence stability in ambient air and LED devices based on the CsPbBr3–5 wt% LE film exhibit a current efficiency (CE) of 24 cd Aβˆ’1 with an external quantum efficiency (EQE) of 6.5%. Therefore, it is anticipated that the findings of the present study will have great potential to boost the development of PeLEDs.

Graphical abstract: Influence of a lecithin additive on the performance of all-inorganic perovskite light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
17 Dec 2018
Accepted
02 Feb 2019
First published
13 Feb 2019

J. Mater. Chem. C, 2019,7, 2905-2910

Influence of a lecithin additive on the performance of all-inorganic perovskite light-emitting diodes

S. Sun, X. Hua, Q. Liu, T. Wang, W. Luo, Y. Zhang, L. Liao and M. Fung, J. Mater. Chem. C, 2019, 7, 2905 DOI: 10.1039/C8TC06365F

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