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양자나노과학 연구단
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High-Efficiency Polycrystalline Perovskite Light-Emitting Diodes Based on Mixed Cations Highly Cited Paper

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Title
High-Efficiency Polycrystalline Perovskite Light-Emitting Diodes Based on Mixed Cations
Author(s)
Himchan Cho; Joo Sung Kim; Christoph Wolf; Young-Hoon Kim; Hyung Joong Yun; Su-Hun Jeong; Aditya Sadhanala; Vijay Venugopalan; Jin Woo Choi; Chang-Lyoul Lee; Richard H. Friend; Tae-Woo Lee
Publication Date
2018-03
Journal
ACS Nano, v.12, no.3, pp.2883 - 2892
Publisher
ACS Publications
Abstract
We have achieved high-efficiency polycrystalline perovskite light-emitting diodes (PeLEDs) based on formamidinium (FA) and cesium (Cs) mixed cations without quantum dot synthesis. Uniform single-phase FA1-xCsxPbBr3 polycrystalline films were fabricated by one-step formation with various FA:Cs molar proportions; then the influences of chemical composition on film morphology, crystal structure, photoluminescence (PL), and electroluminescence (EL) were systematically investigated. Incorporation of Cs+ cations in FAPbBr3 significantly reduced the average grain size (to 199 nm for FA:Cs = 90:10) and trap density; these changes consequently increased PL quantum efficiency (PLQE) and PL lifetime of FA1-xCsxPbBr3 films and current efficiency (CE) of PeLEDs. Further increase in Cs molar proportion from 10 mol % decreased crystallinity and purity, increased trap density, and correspondingly decreased PLQE, PL lifetime, and CE. Incorporation of Cs also increased photostability of FA1-xCsxPbBr3 films, possibly due to suppressed formation of light-induced metastable states. FA1-xCsxPbBr3 PeLEDs show the maximum CE = 14.5 cd A-1 at FA:Cs = 90:10 with very narrow EL spectral width (21-24 nm); this is the highest CE among FA-Cs-based PeLEDs reported to date. This work provides an understanding of the influences of Cs incorporation on the chemical, structural, and luminescent properties of FAPbBr3 polycrystalline films and a breakthrough to increase the efficiency of FA1-xCsxPbBr3 PeLEDs. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4641
ISSN
1936-0851
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
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