Ultra High Efficiency Green Organic Light-Emitting Devices

作者：Daisaku Tanaka, Hisahiro Sasabe, Yan Jun Li, Shi‐Jian Su, Takashi Takeda, Junji Kido · 发表于：Japanese Journal of Applied Physics · 年份：2006 · DOI：10.1143/jjap.46.l10 · 被引用次数：381 · 研究领域：Organic Light-Emitting Diodes Research、Organic Electronics and Photovoltaics、Thin-Film Transistor Technologies

We developed ultra high efficiency green organic light-emitting devices (OLEDs) using a novel electron transport material containing dipyridylphenyl moieties and green phosphorescent emitter, fac tris(2-phenylpyridine)iridium, Ir(ppy) 3 . An OLED with a simple structure of glass/indium–tin oxide/polymer buffer layer/arylamine derivative as a hole transport layer/Ir(ppy) 3 -doped dicarbazolylbiphenyl as an emitter layer/dipyridylphenyl derivative as an electron transport layer/LiF/Al exhibited low drive voltages, which were 2.5 V at 100 cd/m 2 and 2.9 V at 1000 cd/m 2 . High external quantum efficiencies of 29% at 100 cd/m 2 and 26% at 1000 cd/m 2 were also observed, which lead to the ultra high power efficiencies of 133 lm/W at 100 cd/m 2 and 107 lm/W at 1000 cd/m 2 .