J. Park, Eun-kyung Kim, I. El-Deeb
Mar 20, 2011
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0
Influential Citations
12
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Journal
Bulletin of The Korean Chemical Society
Abstract
Department of Information Display, Kyung Hee University, Seoul 130-701, KoreaReceived August 16, 2010, Accepted December 29, 2010New 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 beendesigned and synthesized by attaching the electron transporting benzimidazole moiety to the hole transportingcarbazole unit. These compounds have similar HOMO, LUMO levels and band-gap characteristics comparedwith CBP (4,4'-di( N-carbazolyl)biphenyl). The fabricated green phosphorescent OLED with this 3a host showsmuch better device performances compared to CBP-based one. The current and power efficiency is enhancedat least by 60 percent at a given constant luminance of 1000 cd/m