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Proceedings Paper

Host engineering for high efficiency in phosphorescent organic light emitting diodes
Author(s): Sung Hyun Kim; Kyoung Soo Yook; Jun Yeob Lee
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Paper Abstract

Device performances of green phosphorescent organic light-emitting diodes with triplet mixed host emitting layer were correlated with energy levels and composition of host materials. Two hole transport type host materials, (4,4'-N,N'- dicarbazole)biphenyl(CBP) and 4,4',4"-tris(N-carbazolyl)triphenylamine(TCTA), were combined with two electron transport type host materials, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene(TPBI) and PH1. Maximum quantum efficiency was obtained in 5:5 mixed host in the case of TCTA:TPBI and TCTA:PH1, while CBP:PH1 showed the best performances in 9:1 mixed host. Quantum efficiency of green mixed host devices could be improved by more than 50 % compared with that of corresponding single host devices. Effect of dopant energy levels on device performances of triplet mixed host devices was also investigated and optimum composition for high efficiency depended on energy levels on dopant materials.

Paper Details

Date Published: 14 January 2008
PDF: 8 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280M (14 January 2008); doi: 10.1117/12.768626
Show Author Affiliations
Sung Hyun Kim, Seoul National Univ. (South Korea)
Kyoung Soo Yook, Dankook Univ. (South Korea)
Jun Yeob Lee, Dankook Univ. (South Korea)

Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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