Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 35, Pages 23190-23196Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05877
Keywords
delayed fluorescence; singlet energy; ortho- linkage; charge transfer; triplet energy
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and future Planning [2013R1A2A2A01067447, 2016R1A2B3008845]
- Ministry of Education [2013R1A1A2011560]
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Highly efficient thermally activated delayed fluorescent (TADF) emitters, S-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]carbazole (oBFCzTrz), 5-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]-carbazole (mBFCzTrz), and 5-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]carbazole (pBFCzTrz), were synthesized to study the effects of ortho-, meta-, and para- linkages between donor and acceptor moieties. oBFCzTrz having ortho- linked donor and acceptor moieties showed smaller singlet-triplet energy gap, shorter excited state lifetime, and higher photoluminescence quantum yield than mBFCzTrz and pBFCzTrz which are interconnected by meta- and para- positions. The TADF device using oBFCzTrz as a blue emitter exhibited high external quantum efficiency over 20%, little efficiency roll-off, and long device lifetime.
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