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Adamantane Derivative as Host Material for Efficient Deep-Blue Phosphorescent Organic Light Emitting Diodes

Published online by Cambridge University Press:  31 January 2011

Hirohiko Fukagawa ,
Norimasa Yokoyama ,
Shiro Irisa  and
Shizuo Tokito
Hirohiko Fukagawa
Affiliation:
fukagawa.h-fe@nhk.or.jp, Japan Broadcasting Corporation (NHK), Science & Technical Research Laboratories, Tokyo, Japan
Norimasa Yokoyama
Affiliation:
nyokoyama@hodogaya.co.jp, Hodogaya Chemical Co. Ltd., Tsukuba, Japan
Shiro Irisa
Affiliation:
s-irisa@hodogaya.co.jp, Hodogaya Chemical Co. Ltd., Tsukuba, Japan
Shizuo Tokito
Affiliation:
tokito.s-eu@nhk.or.jp, Japan Broadcasting Corporation (NHK), Science & Technical Research Laboratories, Tokyo, Japan
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Abstract

We report on a high efficiency deep-blue phosphorescent organic light-emitting diode (POLED) based on new electron-transporting host material. The new electron-transporting host material is an adamantane derivative with high triplet energy and high electron mobility. The deep blue POLED that we have developed utilizes a deep-blue phosphorescent guest material, iridium(III)bis(4’,6’,-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate, and exhibits a power efficiency of about 10.2 lm/W at luminance of 100 cd/m2 and maximum external quantum efficiency (EQE) of about 13 %. The power efficiency of our POLED is much higher than that of POLED using p–bis(triphenylsilyly)benzene (UGH2). The maximum EQE of our POLED was also slightly more than that of POLED using UGH2. The obtained difference in power efficiency originates from the new host material having higher electron mobility than that of UGH2.

Keywords

organicluminescenceIr
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1212: Symposium S – Organic Materials and Devices for Sustainable Energy Systems , 2009 , 1212-S01-10
Copyright
Copyright © Materials Research Society 2010

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