Hybridized local and charge-transfer materials using pyrene as π-bridge towards negligible efficiency roll-off in non-doped OLED
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<sup>-2</sup>, highlighting a negligible efficiency roll-off of 4.97%.
Authors
- Feng Wang (ORCID: https://orcid.org/0000-0002-0751-3672)
- Peng Tao (ORCID: https://orcid.org/0000-0003-1932-557X)
- Yanqin Miao (ORCID: https://orcid.org/0000-0003-2659-7696)
- Huixia Xu (ORCID: https://orcid.org/0000-0003-0207-7039)
- Yuqin Du
- Hua Wang (ORCID: https://orcid.org/0000-0002-2976-9521)
- Xinyu Li (ORCID: https://orcid.org/0000-0002-4392-708X)
- Junsheng Yu (ORCID: https://orcid.org/0000-0002-7484-8114)
- Kang Chen (ORCID: https://orcid.org/0000-0003-1484-1209)
- Wenjian Dong
- Yali Peng
Institutions
- Hong Kong Polytechnic University (HK)
- University of Electronic Science and Technology of China (CN)
- Taiyuan University of Technology (CN)
Publication Details
- Journal
- Chemical Science
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5sc01756d
- Citations
- 8
- Primary Topic
- Organic Light-Emitting Diodes Research
- Type
- article
- Field-Weighted Citation Impact
- 5.84
Funders
- National Natural Science Foundation of China
- Shanxi Provincial Key Research and Development Project