Power Efficiency Improvement of White Phosphorescent Organic Light-Emitting Diode with Thin Double-Emitting Layers and Hole-Trapping Mechanism
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概要
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This study is carried out to discuss how to reduce the driving voltage of blue phosphorescent organic light-emitting diodes (PHOLEDs) by using a thin double-emission layer. A hole transport-type host (TCTA) is inserted between the hole transport layer (TAPC) and the emitting layer (EML), constituting a buffer layer between them with the aim of improving charge carrier balance. Furthermore, in this study, we also utilize the interface between double light-emitting layers of devices by codoping them with a red phosphorescent dopant [Os(bpftz)2(PPh2Me)2]. An Os complex with a high-lying highest occupied molecular orbital (HOMO) energy level (trapping holes) is codoped at the interface between emitting layers and an exciton-formation zone is expanded to obtain a white PHOLED with high efficiency. From the results, the optimal structure of the white device exhibits a yield of 35 cd A-1, a power efficiency of 22 lm W-1, and CIE coordinates of $(0.33,0.38)$ at a luminance of 1000 cd m-2. Furthermore, the power efficiency can be improved to 30 lm W-1 by attaching the outcoupling enhancement film.
- 2011-04-25
著者
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Tsai Yu-sheng
Institute Of Electro-optical And Materials Science National Formosa University
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Chi Yun
Department Of Chemistry National Tsing Hua University
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Juang Fuh-shyang
Institute Of Electro-optical And Materials Science National Formosa University
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Hong Lin-ann
Institute Of Electro-optical And Materials Science National Formosa University
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Shieh Han-ping
Department Of Photonics And Display Institute National Chiao Tung University
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Wang Shun-Hsi
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
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Wang Shun-Hsi
Institute of Electro-optical and Materials Science, National Formosa University, 64 Wunhua Road, Huwei, Yunlin 632-08, Taiwan
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Tsai Yu-Sheng
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
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Hong Lin-Ann
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
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Gao Ming-Hong
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
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Hsu Jen-Sung
Chemistry Department, Chung-Shan Institute of Science and Technology, Lungtan 325, Taiwan
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Shieh Han-Ping
Department of Photonics & Institute of Electro-Optical Engineering, National Chiao-Tung University, 1001, Ta-Hsueh Rd., Hsinchu 30010, Taiwan, R.O.C.
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Shieh Han-Ping
Department of Photonics and Display Institute, National Chiao Tung University, Hsinchu 300, Taiwan
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Chi Yun
Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
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Juang Fuh-Shyang
Institute of Electo-optical and Materials Science, National Formosa University, 64 Wunhua Road, Huwei, Yunlin 632-08, Taiwan
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Juang Fuh-Shyang
Institute of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
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