Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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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)
  • Received : 2010.08.16
  • Accepted : 2010.12.29
  • Published : 2011.03.20
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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

References

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