Journal
OPTICS EXPRESS
Volume 23, Issue 10, Pages 12887-12899Publisher
Optica Publishing Group
DOI: 10.1364/OE.23.012887
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Funding
- NSFC [51373050, 61176020]
- New Century Excellent Talents Supporting Program of MOE [NCET-12-0706]
- Key Project of MOE [212039]
- New Century Excellent Talents Developing Program of Heilongjiang Province [1252-NCET-005]
- Science and Technology Bureau of Heilongjiang Province [ZD201402]
- Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China [141012]
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Higher triplet energy and balanced charge mobility is two key factors for high-efficiency host materials of phosphorescent organic light-emitting diodes (PhOLED), which are integrated in a carbazolediphenylene-fluorene hybrid FDPCz2 (9,9'-(4',4 ''-(9H-fluorene-9,9diyl)bis(biphenyl-4', 4-diyl))bis(9H-carbazole)) on the basis of indirect linkage strategy. Owing to rationally spatial allocation of conjugation blocking and extension for diphenylene linkages, FDPCz2 achieves both high triplet energy of 2.97 eV and favorable charge mobility by order of 6.3 x 10(-6) cm(2) V-1 s(-1). Compared to conventional hosts and a short-conjugated analogue FPCz2 (9,9'-(4,4'-(9H-fluorene-9,9-diyl)bis(4,1-phenylene)) bis(9H-carbazole)), FDPCz2 dramatically elevated device efficiencies with peak values of 40.6 cd A(-1) and 20.2% for blue PhOLEDs. (C) 2015 Optical Society of America
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