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http://dx.doi.org/10.5012/bkcs.2011.32.3.841

New Bipolar Green Host Materials Containing Benzimidazole-Carbazole Moiety in Phosphorescent OLEDs  

Park, Jung-Hwan (DUKSAN Hi-METAL Co., Ltd.)
Kim, Eun-Kyung (DUKSAN Hi-METAL Co., Ltd.)
El-Deeb, Ibrahim M. (Department of Biomolecular Science, University of Science and Technology)
Jung, Su-Jin (Life/Health Division, Korea Institute of Science and Technology)
Choi, Dae-Hyuk (DUKSAN Hi-METAL Co., Ltd.)
Kim, Dong-Ha (DUKSAN Hi-METAL Co., Ltd.)
Yoo, Kyung-Ho (Life/Health Division, Korea Institute of Science and Technology)
Kwon, Jang-Hyuk (Department of Information Display, Kyung Hee University)
Lee, So-Ha (Life/Health Division, Korea Institute of Science and Technology)
Publication Information
Bulletin of the Korean Chemical Society / v.32, no.3, 2011 , pp. 841-846 More about this Journal
Abstract
New green host materials, 9-phenyl-3-(4-(1-phenyl-1H-benzo[d] imidazol-2-yl)phenyl)-9H-carbazole (3a) and 9-(naphthyl-2-yl)-3-(4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)-9H-carbazole (3b), have been designed and synthesized by attaching the electron transporting benzimidazole moiety to the hole transporting carbazole unit. These compounds have similar HOMO, LUMO levels and band-gap characteristics compared with CBP (4,4'-di(N-carbazolyl)biphenyl). The fabricated green phosphorescent OLED with this 3a host shows much better device performances compared to CBP-based one. The current and power efficiency is enhanced at least by 60 percent at a given constant luminance of 1000 cd/$m^2$.
Keywords
Benzimidazole; Carbazole; Phosphorescent green host; OLED;
Citations & Related Records
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Times Cited By Web Of Science : 1  (Related Records In Web of Science)
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