Plasma treatment of ITO surfaces to improve luminescence characteristics of organic light-emitting devices with dopants |
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Authors: | Taiki Kawai |
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Affiliation: | Faculty of Engineering, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan |
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Abstract: | Indium-tin-oxide (ITO) surfaces were treated with O2 and H2 plasmas. The contact angle of water, X-ray photoelectron spectroscopy (XPS) spectra, and luminescence characteristics of organic light-emitting devices (OLEDs) fabricated on plasma-treated ITO surfaces using poly(N-vinylcarbazole) (PVK) films doped with 5,6,11,12-tetraphenylnaphthacene (rubrene) or Nile Red were investigated.Using O2 plasma treatment, the contact angle was reduced from 35° to 13°. The luminance of OLEDs with rubrene was significantly improved. The luminous color of an OLED inserted poly (3,4-ethylenedioxythiophene)-polystyrene sulphonic acid (PEDOT-PSS) layer between Nile Red-doped PVK film and O2-plasma-treated ITO surface turned white as the applied voltage increased. |
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Keywords: | ITO surface Plasma treatment Contact angle XPS OLED PVK film Rubrene Nile Red |
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