期刊
THIN SOLID FILMS
卷 517, 期 2, 页码 896-900出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2008.08.180
关键词
Voltage; Current efficiency; Power efficiency; Host; Dopants; Phosphorescent; Organic light-emitting diodes
类别
资金
- Ministry of Commerce, Industry, and Energy of Korea
- EPSRC [EP/D073626/2] Funding Source: UKRI
We report efficiency increase and voltage reduction by bipolar host materials, 4,4'-N,N'-dicarbazoleterpheyl and 4,4'-N,N'-dicarbazolequaterpheyl, in green and red phosphorescent organic light-emitting diodes (PHOLEDs). These host materials are designed to have good electron transporting characteristics with narrow band-gap by adding more phenyl moieties in a 4,4'-N,N'-dicarbazolebiphenyl (CBP) chemical structure. At a given constant luminance of 1000 cd/m(2), power efficiency is enhanced at least by twenty percent compared to general CBP based green and red PHOLEDs. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
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