Dipole-tunable interfacial engineering strategy for high-performance all-inorganic red quantum-dot light-emitting diodes

Cai, Fensha, Li, Meng, Zhou, Yamei, Tu, Yufei, Liang, Chao, Su, Zhenhuang, Gao, Xingyu, Zeng, Zaiping, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Li, Zhe, Aldamasy, Mahmoud H., Jiang, Xiaohong, Wang, Shujie and Du, Zuliang 2024. Dipole-tunable interfacial engineering strategy for high-performance all-inorganic red quantum-dot light-emitting diodes. Nano Energy 119 , 109050. 10.1016/j.nanoen.2023.109050

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Elsevier
ISSN:	2211-2855
Date of First Compliant Deposit:	1 November 2023
Date of Acceptance:	28 October 2023
Last Modified:	23 Dec 2023 09:11
URI:	https://orca.cardiff.ac.uk/id/eprint/163608

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