期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 19, 期 5, 页码 1828-1834出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201202329
关键词
carbazoles; heterocycles; host-guest systems; phosphorescence; organic light-emitting devices
资金
- National Natural Science Foundation of China [21161160442, 51203056]
- National Basic Research Program of China (973 Program) [2013CB922100]
- Open Research Fund of the State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Two hybrids based on 1,8-disubstituted carbazole, 1,8-OXDCz and 1,8-mBICz, have been designed and synthesized through a facile process. The incorporation of oxadiazole or N-phenylbenzimidazole moieties at the 1,8-positions of carbazole greatly improves its morphological stability, giving glass transition temperatures (Tg) as high as 138 and 154 degrees C, respectively. Blue phosphorescent organic light-emitting devices (PhOLEDs) with 1,8-mBICz exhibit almost the same performance as a similarly structured device based on the mCP host, and green PhOLEDs employing the new host material 1,8-OXDCz exhibit an ideal turn-on voltage (2.5 V at 1.58 cdm-2), a maximum current efficiency (eta c,max) of 73.9 cdA-1, and a power efficiency (eta p,max) of 89.7 lmW-1. These results are among the best performances of [Ir(ppy)3]-based devices with simple device configurations.
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