期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202200059
关键词
Blue Thermally Activated Delayed Fluorescence; Donor-Acceptor Distance; Organic Light-Emitting Diodes; TADF-Sensitized Fluorescence; Through-Space Charge Transfer
资金
- National Key Basic Research and Development Program of China [2017YFA0204501, 2020YFA0715000]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302009]
- National Natural Science Foundation of China [51903137, 61890942]
- Young Elite Scientists Sponsorship Program by CAST [2019-2021QNRC]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-005]
This study demonstrates the successful improvement of radiative decay rates of blue TSCT-TADF emitters by adopting a xanthene bridge to construct space-confined face-to-face donor-acceptor alignment.
Thermally activated delayed fluorophors (TADF) featuring through-space charge transfers (TSCT) suffer from low radiative decay rates (k(r)s), especially for blue emitters. Here, a xanthene bridge is adopted to construct space-confined face-to-face donor-acceptor alignment and minimize their distances down to 2.7-2.8 angstrom, even shorter than the interlayer distance of graphite and thus strengthening the electronic interactions. The resulting blue TSCT-TADF emitters exhibit peaks around approximate to 460 nm, photoluminescence quantum yields of >90 %, and k(r)s of nearly 10(7) s(-1), almost 2-10 times higher than previously observed values with comparable reverse intersystem crossing rates. The corresponding blue organic light-emitting diodes show maximum external quantum efficiencies of 27.8 % and 34.7 % with Commission Internationale de L'Eclairage y coordinates of 0.29 and 0.15 using those molecules as emitters and sensitizers, respectively.
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