High-Efficiency Polycrystalline Perovskite Light-Emitting Diodes Based on Mixed Cations

ACS Nano
Himchan ChoTae-Woo Lee

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- xCs xPbBr3 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- xCs xPbBr3 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- xCs xPbBr3 films, possibly due to suppressed formation of light-induced metastable states. FA1- xCs xPbBr3 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 P...Continue Reading

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Citations

Sep 25, 2018·Physical Chemistry Chemical Physics : PCCP·Ilia A VovkIvan D Rukhlenko
Apr 15, 2021·Nature Communications·Changjiu SunMingjian Yuan
May 11, 2021·ACS Applied Materials & Interfaces·Lin ZhangZhaoxin Wu
Apr 26, 2019·Chemical Reviews·Li Na QuanEdward H Sargent
Feb 1, 2020·ACS Applied Materials & Interfaces·Masoud PayandehBahram Abdollahi Nejand
Jun 30, 2019·ACS Applied Materials & Interfaces·Yun Seop ShinJin Young Kim
Jun 30, 2018·ACS Applied Materials & Interfaces·Xiaoli ZhangXiao Wei Sun
Jul 16, 2020·The Journal of Physical Chemistry Letters·Victor M BurlakovAlain Goriely

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