期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202209343
关键词
Electroluminescence; Organic Electronics; Room-Temperature Phosphorescence; Sulfur; Thermally Activated Delayed Fluorescence
资金
- National Natural Science Foundation of China [51625301, 91833304, 51861145301, 51903096]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019B1515120023]
- Guangdong Provincial Department of Science and Technology [2016B090906003, 2016TX03C175]
By introducing sulfur atoms into isomeric pentaphene and pentacene framework, we have designed a series of polycyclic luminophores with efficient TADF and RTP characteristics, which can expand the application field of organic light-emitting diodes.
Highly efficient organic thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) emitters for organic light-emitting diodes (OLEDs) generally consist of a twisted donor-acceptor skeleton with aromatic amine donors. Herein, through introducing sulfur atoms into isomeric pentaphene and pentacene frameworks, we demonstrate a set of polycyclic luminophores exhibiting efficient TADF and RTP characters. The incorporation of sulfur atoms confirms a folded molecular plane, while intensifies singlet-triplet spin-orbit coupling. Further, the isomeric effect has a significant effect on the electronic structure of excited state, giving rise to the investigated compounds tunable luminescence mechanisms of TADF and RTP. With efficient triplet harvesting ability, maximum external quantum efficiencies up to 25.1 % and 8.7 % are achieved for the corresponding TADF and RTP OLEDs, verifying the great potential of sulfur-bridged frameworks for highly efficient devices.
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