Charge carrier regulation for efficient blue quantum-dot light-emitting diodes via a high-mobility coplanar cyclopentane[b]thiopyran derivative

Cai, Fensha, Zong, Hao, Li, Meng, Li, Chenguang, Huang, Guangguang, Pascual, Jorge, Liang, Chao, Su, Zhenhuang, Li, Zhe, Gao, Xingyu, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Wang, Shujie, Zhou, Gang and Du, Zuliang 2024. Charge carrier regulation for efficient blue quantum-dot light-emitting diodes via a high-mobility coplanar cyclopentane[b]thiopyran derivative. Nano Letters 24 (17) , pp. 5284-5291. 10.1021/acs.nanolett.4c00883

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Abstract

The performance of blue quantum dot light-emitting diodes (QLEDs) is limited by unbalanced charge injection, resulting from insufficient holes caused by low mobility or significant energy barriers. Here, we introduce an angular-shaped heteroarene based on cyclopentane[b]thiopyran (C8–SS) to modify the hole transport layer poly-N-vinylcarbazole (PVK), in blue QLEDs. C8–SS exhibits high hole mobility and conductivity due to the π···π and S···π interactions. Introducing C8–SS to PVK significantly enhanced hole mobility, increasing it by 2 orders of magnitude from 2.44 × 10–6 to 1.73 × 10–4 cm2 V–1 s–1. Benefiting from high mobility and conductivity, PVK:C8–SS-based QLEDs exhibit a low turn-on voltage (Von) of 3.2 V. More importantly, the optimized QLEDs achieve a high peak power efficiency (PE) of 7.13 lm/W, which is 2.65 times that of the control QLEDs. The as-proposed interface engineering provides a novel and effective strategy for achieving high-performance blue QLEDs in low-energy consumption lighting applications.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Chemical Society
ISSN:	1530-6984
Date of First Compliant Deposit:	17 April 2024
Date of Acceptance:	12 April 2024
Last Modified:	04 Jun 2024 12:58
URI:	https://orca.cardiff.ac.uk/id/eprint/168013

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