High-Efficiency Green Phosphorescent Organic Light-Emitting Devices with Chemically Doped Layers
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概要
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We have developed green phosphorescent organic light-emitting devices (OLEDs) with high quantum and luminous efficiencies. A green phosphorescent metal complex, fac-tris(2-phenylpyridine) iridium [Ir(ppy)3], was used as an emitter material. Wide-energy-gap materials with high triplet excited energy levels were used as host materials for Ir(ppy)3 and as carrier transport materials. Hole injection and electron injection from the electrodes were balanced by placing chemically doped layers at the interface between the electrodes and the organic layers. In addition, a highly reflective Ag cathode was employed as an anode, instead of a conventional Al cathode to enhance the reflectivity of the cathode metal. An optimized device exhibited an external quantum efficiency (EQE) of 27% (95 cd/A) and a high power efficiency of 97 lm/W at 100 cd/m2 at 3.1 V.
- 2007-03-15
著者
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Kido Junji
Graduate School Of Engineering Yamagata University
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Watanabe Soichi
Graduate School Of Science And Engineering Yamagata University
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Watanabe Soichi
Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
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Kido Junji
Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
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Ide Nobuhiro
Optoelectronic Industry and Technology Development Association, Bunkyo-ku, Tokyo 112-0014, Japan
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