期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 44, 页码 15728-15734出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc03965a
关键词
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资金
- National Key Basic Research and Development Program of China [2016YFB0401002]
- National Natural Science Foundation of China [61520106012, 61722404, 51873138]
- 333 Program [BRA2019061]
- Collaborative Innovation Center of Suzhou Nano Science Technology
High-efficiency orange and red thermally activated delayed fluorescent (TADF) organic light-emitting diodes were fabricated based on a pair of isomers 3,6,11-triAC-BPQ and 3,6,12-triAC-BPQ, containing a rigid dibenzo[f,h]pyrido[2,3-b]quinoxaline (BPQ) core and three 9,9-dimethyl-9,10-dihydroacridine (Ac) donors. Both materials exhibited red emission in neat films and small singlet-triplet energy gaps. Compared with the stable intramolecular charge transfer (ICT) state of 3,6,12-triAC-BPQ, 3,6,11-triAC-BPQ showed hybridized local and charge transfer (HLCT) character due to the H-bond between the 11-position Ac and 10-position N atom. As a result, the doped film of 3,6,11-triAC-BPQ showed a high photoluminescence quantum yield (PLQY) and the related device showed a high external quantum efficiency (EQE) of 22.0% in the orange-red region.
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