Oxygen-Plasma-Treated Indium–Tin-Oxide Films on Nonalkali Glass Deposited by Super Density Arc Plasma Ion Plating
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概要
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The effects of O2 plasma treatment on both the chemical composition and work function of an indium–tin-oxide (ITO) film were investigated. ITO films were deposited on non-alkali glass substrate by super density arc plasma ion plating for application in active-matrix organic light-emitting diodes (OLEDs). The water contact angle decreased from 38 to 11° as the ITO films were treated with O2 plasma for 60 s at a plasma power of 150 W, indicating an increase in the hydrophilicity of the surface. It was found that there were no distinct changes in the microstructure or electrical properties of the ITO films with O2 plasma treatment. Synchrotron radiation photoemission spectroscopy data revealed that O2 plasma treatment decreased the amount of carbon contamination and increased the number of unscreened states of In3+ and (O2)2- peroxo species. This played the role of increasing the work function of the ITO films by 1.7 eV. As a result, the turn-on voltage of the OLED decreased markedly from 24 to 8 V and the maximum luminance value of the OLED increased to 2500 cd/m2.
- 2008-02-25
著者
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Lee Jong-lam
Department Of Materials Science And Engineering Pohang University Of Science And Technology (postech
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Kim Soo
Department Of Advanced Technology Fusion Konkuk University
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Choi Kyu
Department Of Chemical Engineering University Of Maryland
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Son Jun
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk 790-784, Korea
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Song Kyu
Shin An SNP, Daegu 704-240, Korea
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Choi Kyu
Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Hong Kihyon
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk 790-784, Korea
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Jung Gwan
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Kyungbuk 790-784, Korea
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Ahn Kyung
Shin An SNP, Daegu 704-240, Korea
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Hong Kihyon
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790-784, Korea
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