Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 38, Pages 12380-12384Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804218
Keywords
donor-acceptor systems; exciplexes; organic light-emitting diodes; phenylpyridinato boron; thermally activated delayed fluorescence
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Funding
- JST ERATO Grant [JPMJER1305]
- JSPS KAKENHI Grant [JP17K14531]
- China Scholarship Council
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Understanding excited-state dynamics is critical for improving the photoluminescence (PL) efficiency of exciplexes. A series of exciplexes based on conventional hole-transporting materials as donor and newly developed phenylpyridinato boron derivatives as acceptor were investigated. High PL efficiencies were achieved in only some combinations, and a large difference in performance among combinations provided insight into nonradiative processes in exciplex systems. Furthermore, the triplet local excited states ((LE)-L-3) of each donor and acceptor were found play an important role in triplet exciplex harvesting. Significant contributions from triplets were clearly observed when the charge-transfer excited states ((CT)-C-1 and (CT)-C-3) and (LE)-L-3 were ideally aligned. We also demonstrated fine control of relative energy alignment via the concentration to improve the PL efficiency.
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