首页|Buried interface modification and light outcoupling strategy for efficient blue perovskite light-emitting diodes

Buried interface modification and light outcoupling strategy for efficient blue perovskite light-emitting diodes

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Perovskite light-emitting diodes(PeLEDs)exhibit remarkable potential in the field of displays and solid-state lighting.However,blue PeLEDs,a key element for practical applications,still lag behind their green and red counterparts,due to a combination of strong nonradiative recombination losses and unoptimized device structures.In this report,we propose a buried interface modification strategy to address these challenges by focusing on the bottom-hole transport layer(HTL)of the PeLEDs.On the one hand,a mul-tifunctional molecule,aminoacetic acid hydrochloride(AACl),is introduced to modify the HTL/perovskite interface to regulate the perovskite crystallization.Experimental investigations and theoretical calcula-tions demonstrate that AACl can effectively reduce the nonradiative recombination losses in bulk per-ovskites by suppressing the growth of low-n perovskite phases and also the losses at the bottom interface by passivating interfacial defects.On the other hand,a self-assembly nanomesh structure is ingeniously developed within the HTLs.This nanomesh structure is meticulously crafted through the blending of poly-(9,9-dioctyl-fluorene-co-N-(4-butyl phenyl)diphenylamine)and poly(n-vinyl car-bazole),significantly enhancing the light outcoupling efficiency in PeLEDs.As a result,our blue PeLEDs achieve remarkable external quantum efficiencies,20.4％at 487 nm and 12.5％at 470 nm,which are among the highest reported values.Our results offer valuable insights and effective methods for achiev-ing high-performance blue PeLEDs.

Buried interfaceLight outcoupling strategyPerovskite light-emitting diodeBlue emission

Shuxin Wang、Zhiqiu Yu、Jiajun Qin、Guoyi Chen、Yongjie Liu、Shuaiwei Fan、Chao Ma、Fang Yao、Hongsen Cui、Shun Zhou、Kailian Dong、Qianqian Lin、Chen Tao、Feng Gao、Weijun Ke、Guojia Fang

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Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China,School of Physics and Technology,Wuhan University,Wuhan 430072,China

Department of Physics,Chemistry and Biology(IFM),Linköping University,Linköping SE-58183,Sweden

Department of Physics,China Three Gorges University,Yichang 443002,China

Key Laboratory of Flexible Electronics(KLOFE),Institute of Advanced Materials(IAM),School of Flexible Electronics(Future Technologies),Nanjing Tech University,Nanjing 211816,China

School of Electronic and Electrical Engineering,Wuhan Textile University,Wuhan 430200,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey R&D program from Hubei ProvinceERC Consolidator GrantERC Consolidator GrantSwedish Government Strategic Research Area in Materials Science on Functional Materials at Link?ping University

1213401062074117121742902023BAB102LEAP101045098SFO-Mat-LiU 2009-00971

2024

10.1016/j.scib.2024.05.028

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(14)
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