Journal
ADVANCED MATERIALS
Volume 26, Issue 41, Pages 7070-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201400710
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Funding
- NSFC [50903028, 61176020, 51373050]
- New Century Excellent Talents Supporting Program of MOE [NCET-12-0706]
- Key Project of MOE [212039]
- Education Bureau of Heilongjiang Province [1252-NCET-005, 10td03]
- 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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Highly efficient green and red electro-phosphorescence is achieved in devices with the host material DPESPODEF3. The multiple fluorenyl moieties of the host material are arranged such that it has an unsymmetrical molecular configuration, and its triplet-state location is tuned such that it has independent energy (ET) and charge transfer (CT) channels. As a result, DPESPODEF3 can suppress triplet-triplet annihilation and triplet-polaron quenching. In the resulting green and red phosphorescent devices, impressive external quantum efficiencies of ca. 20% and 16% and power efficiencies of ca. 75 and 20 lm W-1, respectively, are observed.
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