Fabrication and Characterization of Flexible Organic Light Emitting Diodes Based on Transparent Flexible Clay Substrates
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概要
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In the present work, transparent flexible polymer-doped clay (P-clay) substrates were prepared for flexible organic light emitting diode (OLED) applications. Nanocrystalline indium tin oxide (ITO) thin films were prepared on P-clay substrates by ion-beam sputter deposition method. The structural, optical, and electrical properties of as-prepared ITO/P-clay showed that the as-prepared ITO thin film was amorphous, and the average optical transparency and sheet resistance were around 84% and 56 \Omega/\square, respectively. The as-prepared ITO/P-clay samples were annealed at 200 and 270 °C for 1 h to improve the optical transparency and electrical conductivity. The average optical transparency was found to be maximum at an annealing temperature of 200 °C. Finally, N,N-bis[(1-naphthyl)-N,N\aku '-diphenyl]-1,1'-biphenyl)-4,4'-diamine (NPB), tris(8-hydroxyquinoline) aluminum (Alq3) thin films, and aluminum (Al) electrode were prepared on ITO/P-clay substrates by thermal evaporation method. The current density--voltage (J--V) characteristic of Al/NPB/ITO/P-clay showed linear Ohmic behaviour. In contrast, J--V characteristic of Al/Alq3/NPB/ITO/P-clay showed non-linear Schottky behaviour. Finally, a very flexible OLED was successfully fabricated on newly fabricated transparent flexible P-clay substrates. The electroluminescence study showed that the emission intensity of light from the flexible OLED device gradually increased with increasing applied voltage.
- 2013-03-25
著者
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NAKAMURA Takashi
National Institute of Radiological Sciences
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Nanjo Hiroshi
National Institute Of Advanced Industrial Science And Technology (aist)
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Ebina Takeo
National Inst. Advanced Industrial Sci. And Technol.(aist) Sendai Jpn
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HAYASHI Hiromichi
National Institute of Advanced Industrial Science and Technology
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Venkatachalam Shanmugam
National Institute of Advanced Industrial Science and Technology (AIST), Sendai 983-0851, Japan
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Hayashi Hiromichi
National Institute of Advanced Industrial Science and Technology (AIST), Sendai 983-0851, Japan
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Nanjo Hiroshi
National Institute of Advanced Industrial Science and Technology (AIST), Sendai 983-0851, Japan
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Ebina Takeo
National Institute of Advanced Industrial Science and Technology (AIST), Sendai 983-0851, Japan
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