材料科学
量子点
钝化
光电子学
二极管
发光二极管
猝灭(荧光)
单层
偶极子
量子效率
荧光
纳米技术
光学
图层(电子)
化学
物理
有机化学
作者
Fensha Cai,Meng Li,Yamei Zhou,Yufei Tu,Chao Liang,Zhenhuang Su,Xinyu Gao,Zaiping Zeng,Bo Hou,Zhe Li,Mahmoud H. Aldamasy,Xiaohong Jiang,Shujie Wang,Zuliang Du
出处
期刊:Nano Energy
[Elsevier]
日期:2024-01-01
卷期号:119: 109050-109050
标识
DOI:10.1016/j.nanoen.2023.109050
摘要
All-inorganic quantum dot (QD) light-emitting diodes (AI-QLEDs) with excellent stability received enormous interest in the past few years. Nevertheless, the vast energy offset and the high trap density at the NiOX/QDs interface limit hole injection leading to fluorescence quenching and hampering the performance. Here, we present self-assembled monolayers (SAMs) with phosphonic acid (PA) anchoring groups modifying NiOX hole transport layer (HTL) to tune energy level and passivate trap states. This strategy facilitates hole injection owning to the well-aligned energy level by interface dipole, downshifting the vacuum level, reducing the hole injection barrier from 0.94 eV to 0.28 eV. Meanwhile, it mitigates the interfacial recombination by passivating surface hydroxyl group (-OH) and oxygen vacancy (VO) traps in NiOX. The electron leakage from QDs toward NiOX HTL is significantly suppressed. The all-inorganic R-QLEDs exhibit one of the highest maximum luminance, external quantum efficiency and operational lifetime of 88980 cd m−2, 10.3 % and 335045 h (T50 @100 cd m−2), respectively. The as-proposed interface engineering provides an effective design principle for high-performance AI-QLEDs for future outdoor and optical projection-type display applications.
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