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

Title
New Bipolar Green Host Materials Containing Benzimidazole-Carbazole Moiety in Phosphorescent OLEDs
Authors
박정환김은경이브라임정수진최대혁김동하유경호권장혁이소하
Keywords
Benzimidazole; Carbazole; Phosphorescent green host; OLED
Issue Date
2011-03
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 32, NO 2, 841-846
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/㎡.
URI
http://pubs.kist.re.kr/handle/201004/39531
ISSN
0253-2964
Appears in Collections:
KIST Publication > Article
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