Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Characteristics of Fluorescent Organic Light Emitting Diodes using Amorphous IZO Anode Film

비정질 IZO 애노드를 이용한 형광 유기발광소자의 특성

  • 문종민 (국립금오공과대학교 정보나노소재공학과) ;
  • 배정혁 (국립금오공과대학교 정보나노소재공학과) ;
  • 정순욱 (국립금오공과대학교 정보나노소재공학과) ;
  • 강재욱 (서울대학교 OLED센터) ;
  • 김한기 (국립금오공과대학교 정보나노소재공학과)
  • Published : 2006.11.01
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Abstract

We reported on characteristics of the fluorescent OLED fabricated on commercial ITO/glass and BCS grown IZO/glass substrate, respectively. The amorphous IZO anode film grown by box cathode sputtering(BCS) exhibited similar electrical and optical characteristics to commercial ITO anode even though it was deposited at room temperature. In addition, the amorphous IZO anode showed higher workfunction (5.2 eV) than that of the commercial ITO anode (5.0 eV) after ozone treatment for 10 min. Furthermore, fluorescent OLED fabricated on amorphous IZO anode film showed improved current-voltage-luminance characteristics, external quantum efficiency and power efficiency en contrast with fluorescent OLED fabricated on commercial ITO anode film. It was thought that smooth surface and high workfunction of amorphous IZO anode lead to more efficient hole injection by reduction of interface barrier height between anode and organic layers.

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References

  1. C. W. Tang and S. A. VanSlyke, 'Organic electroluminescent diodes', Appl. Phys. Lett., Vol. 51, p. 913, 1987
  2. C. W. Tang, 'Two-layer organic photovoltaic cell', Appl. Phys. Lett., Vol. 48, p. 183, 1986 https://doi.org/10.1063/1.96937
  3. R. H. Friend, R. W. Gymer, A. B. Holmes, J. H. Burroughes, R. N. Marks, C. Taliani, D. D. C. Bradley, D. A. dos Santos, J. L. Bredas, M. Logdlund, and W. R. Salaneck, 'Electrolurninescence in conjugated polymers', Nature, Vol. 397, p. 121, 1999
  4. H. Kim, A. Pique, J. S. Horwitz, H. Mattoussi, H. Murata, Z. H. Kafafi, and D. B. Chrisey, 'Indium tin oxide thin films for organic light-emitting devices', Appl. Phys. Lett., Vol. 74, p. 3444, 1999 https://doi.org/10.1063/1.124122
  5. T. Minami, 'New n-Type Transparent Conducting Oxides', MRS bulletin, p, 38, 2000
  6. J. - J. Ho and C. - Y. Chen, 'Power effects in indium-zinc oxide thin films for OLEDs on flexible applications', J. Electrochem. Soc., Vol. 152, p. 57, 2005 https://doi.org/10.1149/1.1829431
  7. G. Hu, B. Kumar, H. Gong, E. F. Chor, and P. Wu, 'Transparent indium zinc oxide ohmic contact to phosphor-doped n-type zinc oxide', Appl. Phys. Lett., Vol. 88, p. 101901, 2006 https://doi.org/10.1063/1.2178404
  8. J.-M. Moon, J.-H Bae, S.-W. Jeong, N.-J. Park, J.-W. Kang, and H.-K. Kim, 'Room temperature fabrication of organic flexible displays using amorphous IZO anode film', J. of KIEEME(in Korean), Vol. 19, No. 7, p, 687, 2006 https://doi.org/10.4313/JKEM.2006.19.7.687
  9. H.-K Kim, K.-S. Lee, and H.-A. Kang, 'Characteristics of indium zinc oxide cathode layer grown by box cathode sputtering for top emitting organic light emitting diodes', J. Electrochem. Soc., Vol. 153, p. H29, 2006 https://doi.org/10.1149/1.2139953
  10. H.-K. Kim, D.-G. Kim, K.-S. Lee, M.-S. Huh, S. H. Jeong, K. I. Kim, and T.-Y. Seong, 'Plasma damage-free sputtering of indium tin oxide cathode layers for top-emitting organic light-emitting diodes', Appl. Phys. Letts., Vol. 86, p. 183503, 2005 https://doi.org/10.1063/1.1923182
  11. H.-K. Kim, D.-G. Kim, K.-S. Lee, M. S. Huh, S. H. Jeong, K. I. Kim, H. Kim, D. W. Han, and J. H. Kwon, 'Plasma damage free deposition of Al cathode on organic light emitting devices by using mirror shape target sputtering', Appl. Phys. Lett., Vol. 85, p. 4295, 2004 https://doi.org/10.1063/1.1815394
  12. H.-K. Kim, K.-S. Lee, and J. H. Kwon, 'Transparent indium zinc oxide top cathode prepared by plasma-damage free sputtering for top emitting organic light emitting diodes', Appl. Phys. Lett., Vol. 88, p. 012103, 2006 https://doi.org/10.1063/1.2159577