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

作者：Park Jung Hwan; Kim Eun Kyung; El Deeb Ibrahim M; Jung Su Jin; Choi Dae Hyuk; Kim Dong Ha; Yoo Kyung Ho; Kwon Jang Hyuk; Lee So Ha

来源：Bulletin of the Korean Chemical Society, 2011, 32(3): 841-846.

DOI：10.5012/bkcs.2011.32.3.841

• Benzimidazole
• Carbazole
• Phosphorescent green host
• OLED

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).

• 出版日期2011-3-20