Performance Improvement of Flexible Organic Light-Emitting Diodes with Double Hole Transport Layers by Spin-Coating and Evaporation
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概要
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In this study N,N$'$-bis(naphthalen-1-yl)-N,N$'$-bis(phenyl)-benzidine (NPB) was dissolved in tetrahydrofuran (THF) solvent, and the resulting solution was spin-coated onto an indium tin oxide (ITO)-coated plastic substrate to form the first hole transport layer (HTL). A second hole transport layer of NPB was then deposited by thermal evaporation on the first HTL to produce a flexible organic light-emitting diode (OLED) with a double HTL structure. The luminance efficiency of a device with a double HTL structure is thereby improved. Utilizing spin-coated (NPB+THF)/evaporated NPB as the double HTL structure, the efficiency can reach 3.86 cd/A, and the lifetime is extended by 14.4% compared with that of the conventional single thermally evaporated HTL.
- 2009-05-25
著者
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Tsai Yu-sheng
Institute Of Electro-optical And Materials Science National Formosa University
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Chen Shin-Liang
Institute of Electro-Optical and Materials Science, National Formosa University, Huwei, Yunlin 63208, Taiwan
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Wang Shun-Hsi
Institute of Electro-Optical and Materials Science, National Formosa University, Huwei, Yunlin 63208, 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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