期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 8, 页码 3994-3998出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013051
关键词
charge transfer; donor-acceptor systems; fluorescence; luminescence; π – π interactions
资金
- National Natural Science Foundation of China [21801170, 91833304]
- Shenzhen Science and Technology Program [KQTD20170330110107046, JCYJ20190808172203553]
- Hong Kong Quantum AI Lab Limited
- Department of Science and Technology of Guangdong Province [2019QN01C617]
Intramolecular through-space charge-transfer (TSCT) excited states are utilized for developing thermally activated delayed fluorescence (TADF) emitters, with a series of precisely controlled TSCT emitters designed through alignment optimization of donor and acceptor segments. By increasing intramolecular pi-pi interactions, radiative decay rate of the lowest singlet excited state (S-1) is progressively enhanced with suppression of nonradiative decay, leading to significantly improved photoluminescence quantum yields of up to 0.99 in doped thin films. A high-efficiency electroluminescence device achieves a maximum external quantum efficiency (EQE) of 23.96% and maintains >20% at a brightness of 1000 cd m(-2), highlighting the importance of conformation control for high-efficiency intramolecular exciplex emitters.
Intramolecular through-space charge-transfer (TSCT) excited states have been exploited for developing thermally activated delayed fluorescence (TADF) emitters, but the tuning of excited state dynamics by conformational engineering remains sparse. Designed here is a series of TSCT emitters with precisely controlled alignment of the donor and acceptor segments. With increasing intramolecular pi-pi interactions, the radiative decay rate of the lowest singlet excited state (S-1) progressively increased together with a suppression of nonradiative decay, leading to significantly enhanced photoluminescence quantum yields of up to 0.99 in doped thin films. A high-efficiency electroluminescence device, with a maximum external quantum efficiency (EQE) of 23.96 %, was achieved and maintains >20 % at a brightness of 1000 cd m(-2). This work sheds light on the importance of conformation control for achieving high-efficiency intramolecular exciplex emitters.
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