High-Efficiency Blue Perovskite Light-Emitting Diodes with Improved Photoluminescence Quantum Yield via Reducing Trap-Induced Recombination and Exciton–Exciton Annihilation

Zhiqiang Guan; Yang Li; Zhaohua ZhuZixin ZengZiming ChenZhiwei RenGang LiSai-Wing TsangHin-Lap YipYuan XiongChun-Sing Lee

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High-Efficiency Blue Perovskite Light-Emitting Diodes with Improved Photoluminescence Quantum Yield via Reducing Trap-Induced Recombination and Exciton–Exciton Annihilation

机译：High-Efficiency Blue Perovskite Light-Emitting Diodes with Improved Photoluminescence Quantum Yield via Reducing Trap-Induced Recombination and Exciton–Exciton Annihilation

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Although the performance of blue perovskite LEDs (PeLEDs) has improvedrapidly in the past few years, it still lags behind their green and red counterparts.One major cause of the inferior performance is the relatively lowphotoluminescence quantum yield (PLQY) of blue perovskite emitters due tomore severe nonradiative recombination loss induced by traps and exciton–exciton annihilation (EEA). In this study, theoretical analysis reveals thattrap-induced recombination limits the maximum obtainable PLQY and EEAleads to fast roll-off at high excitons densities. To address these issues, asynergic approach by introducing CsAc into perovskite and applying solventannealing (SA) is used to suppress the trap-induced recombination and theEEA, respectively. The acetate anion in CsAc effectively passivates defects ofperovskite through Lewis acid–base reaction, enhancing PLQY of the perovskitefilms from 10.7% to 49.2%. Furthermore, carrier recombination dynamicinvestigations reveal that EEA and PLQY roll-off are successfully deferredwith SA treatment. As a result, external quantum efficiency (EQE) is improvedfrom 2.9% to 11% and EQE roll-off is significantly suppressed at high currentdensity. This work demonstrates that alleviating trap-induced and EEA nonradiativelosses are two effective methods to improve the PLQY and EQE ofblue PeLEDs.

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来源
《Advanced functional materials》 |2022年第40期|2203962.1-2203962.9|共9页
作者
Zhiqiang Guan; Yang Li; Zhaohua ZhuZixin ZengZiming ChenZhiwei RenGang LiSai-Wing TsangHin-Lap YipYuan XiongChun-Sing Lee;
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Center of Super-Diamond and Advanced Films (COSDAF)City University of Hong KongHong Kong, P. R. China Department of ChemistryCity University of Hong KongHong Kong, P. R. China;

Center of Super-Diamond and Advanced Films (COSDAF)City University of Hong KongHong Kong, P. R. China Department of Material Science and EngineeringCity University of Hong KongHong Kong, P. R. China;

Department of ChemistryImperial College LondonLondon W12 0BZ, United KingdomDepartment of Electronic and Information EngineeringResearch Institute for Smart Energy (RISE)The Hong Kong Polytechnic UniversityHung Hom, Kowloon, Hong Kong, P. R. ChinaDepartment of Material Science and EngineeringCity University of Hong KongHong Kong, P. R. China;

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CsAc; exciton–exciton annihilation; perovskite light-emitting diodes; photoluminescence quantum yield; trap-induced recombination;

High-Efficiency Blue Perovskite Light-Emitting Diodes with Improved Photoluminescence Quantum Yield via Reducing Trap-Induced Recombination and Exciton–Exciton Annihilation

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