Hybridized local and charge-transfer materials using pyrene as π-bridge towards negligible efficiency roll-off in non-doped OLED

Abstract

The development of organic light-emitting diodes (OLED) with low efficiency roll-off at high brightness still remains a significant challenge. The hot-exciton mechanism provides a potential solution owing to its unique high-lying reverse intersystem crossing (hRISC) with a sufficiently large rate constant. Herein, two pyrene-based hot-exciton molecules, namely TPAPyCP and 2mTPAPyCP, were successfully designed using triphenylamine (TPA) as donor and benzonitrile as acceptor. The planar pyrene provided multiple fast hRISC channels, which effectively improved the photoluminescence quantum yield (PLQY) values to 73.2% and 65.8% in neat films. A non-doped device based on TPAPyCP demonstrated a maximum external quantum efficiency (EQE) of 9.41% and still maintained 8.95% at a high luminance of 10 000 cd m−2, highlighting a negligible efficiency roll-off of 4.97%.

Graphical abstract: Hybridized local and charge-transfer materials using pyrene as π-bridge towards negligible efficiency roll-off in non-doped OLED

Supplementary files

Article information

Article type
Edge Article
Submitted
05 Mar 2025
Accepted
19 May 2025
First published
20 May 2025
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2025, Advance Article

Hybridized local and charge-transfer materials using pyrene as π-bridge towards negligible efficiency roll-off in non-doped OLED

Y. Du, Y. Peng, W. Dong, H. Xu, X. Li, K. Chen, F. Wang, Y. Miao, P. Tao, H. Wang and J. Yu, Chem. Sci., 2025, Advance Article , DOI: 10.1039/D5SC01756D

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