Charge Carrier Regulation for Efficient Blue Quantum-Dot Light-Emitting Diodes Via a High-Mobility Coplanar Cyclopentane[b]thiopyran Derivative
Fensha Cai, Hao Zong, Meng Li, Chenguang Li, Guangguang Huang, Jorge Pascual, Chao Liang, Zhenhuang Su, Zhe Li, Xingyu Gao, Bo Hou, Shujie Wang, Gang Zhou, Zuliang Du
TL;DR
This paper introduces a new material to improve the efficiency of blue quantum dot light-emitting diodes by enhancing charge transport.
Contribution
A novel high-mobility coplanar cyclopentane[b]thiopyran derivative is introduced to enhance hole transport in blue QLEDs.
Findings
C8–SS increases hole mobility in PVK by two orders of magnitude.
QLEDs with PVK:C8–SS show a low turn-on voltage of 3.2 V.
The peak power efficiency reaches 7.13 lm/W, 2.65 times higher than control devices.
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…
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Taxonomy
TopicsSociopolitical Dynamics in Russia · Cultural, Linguistic, Economic Studies · Central Asia Education and Culture