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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Electrical and Optical Properties of Top Emission OLEDs with CsCl Passivation Layer

CsCl 보호막을 이용한 전면발광 OLED의 전기 및 광학적 특성

  • 김소연 (순천향대학교 신소재공학과) ;
  • 문대규 (순천향대학교 신소재공학과) ;
  • 한정인 (전자부품연구원 디스플레이센터)
  • Published : 2008.02.01
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Abstract

We have developed the transparent passivation layer for top emission organic light emitting diodes using CsCl thin film by the thermal evaporation method. The CsCl film was deposited on the Ca/Ag semitransparent cathode. The optical transmittance of Ca/ Ag/CsCl triple layer is higher than that of Ca/Ag double layer in the visible range. The device with a structure of glass/Ni/2-TNATA/a-NPD/Alq3:C545T/BCP/Alq3/Ca/Ag/CsCl results in higher efficiency than the device without CsCl passivation layer. The device without CsCl thin film shows a current efficiency of 7 cd/A, whereas the device passivated with CsCl layer shows an efficiency of 10 cd/A. This increase of efficiency isresulted from the increased optical extraction by the CsCl passivation layer.

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References

  1. C. W. Tang and S. A. VanSlyke, 'Organic electroluminescent diodes', Appl. Phys. Lett., Vol. 51, No. 12, p. 913, 1987 https://doi.org/10.1063/1.98799
  2. 정동희, 김상걸, 홍진웅, 이준웅, 김태완, '버 퍼층과 음전극에 따른 유기 발광 소자의 전 기적 특성과 발광 효율', 전기전자재료학회논문지, 16권, 5호, p. 409, 2003
  3. N. Ibaraki and M. Kobayashi, 'Views on the present and future promise of OLED displays', SID'06 Digest, p. 1760, 2006
  4. 문대규, 이찬재, 한정인, 'Ba/Ag 투명 음극을 이용한 전면발광 OLEDs의 전기 및 광학적 특성', 전기전자재료학회논문지, 19권, 9호, p. 873, 2006 https://doi.org/10.4313/JKEM.2006.19.9.873
  5. T. Sasaoka, M. Sekiya, A. Yumoto, J. Yamada, T. Hirano, Y. Iwase, T. Yamada, T. Ishibashi, T. Mori, M. Asano, S. Tamura, and T. Urabe, 'A 13.0-inch AM-OLED display with top-emitting structure and adapative current mode programmed pixel circuit (TAC)', SID'01 Digest, p. 384, 2001
  6. G. Gu, V. Bulovic, P. E. Burrows, S. R. Forrest, and M. E. Thompson, 'Transparent organic light emitting devices', Appl. Phys. Lett., Vol. 68, No. 19, p. 2606, 1996 https://doi.org/10.1063/1.116196
  7. G. Parthasarathy, C. Adachi, P. E. Burrows, and S. R. Forrest, 'High-efficiency transparent organic light-emitting devices', Appl. Phys. Lett., Vol. 76, No. 15, p. 2128, 2000 https://doi.org/10.1063/1.126275
  8. P. E. Burrows, G. Gu, S. R. Forrest, E. P. Vicenzi, and T. X. Zhou, 'Semitransparent cathodes for organic light emitting devices', J. Appl. Phys., Vol. 87, No. 6, p. 3080, 2000 https://doi.org/10.1063/1.372303
  9. G. Parthasarathy, P. E. Burrows, V. Khalfin, V. G. Kozlov, and S. R. Forrest, 'A metal-free cathode for organic semiconductor devices', Appl. Phys. Lett., Vol. 72, No. 17, p. 2138, 1998 https://doi.org/10.1063/1.121301
  10. L. S. Hung, C. W. Tang, M. G. Mason, P. Raychaudhuri, and J. Madathil, 'Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes', Appl. Phys. Lett., Vol. 78, No. 4, p. 544, 2001 https://doi.org/10.1063/1.1327273
  11. G. G. Qin, A. G. Xu, G. L. Ma, G. Z. Ran, Y. P. Qiao, B. R. Zhang, W. X. Chen, and S. K. Wu, 'A top-emission organic lightemitting diode with a silicon anode and an Sm/Au cathode', Appl. Phys. Lett., Vol. 85, No. 22, p. 5406, 2004 https://doi.org/10.1063/1.1823601
  12. S. L. Lai, M. Y. Chan, M. K. Fung, C. S. Lee, and S. T. Lee, 'Application of Ytterbium in organic light-emitting devices as as high performance and transparent electrodes', Chem. Phys. Lett., Vol. 366, No. 1, p. 128, 2002 https://doi.org/10.1016/S0009-2614(02)01553-1
  13. R. B. Pode, C. J. Lee, D. G. Moon, and J. I. Han, 'Transparent conducting metal electrode for top emission organic light-emitting devices : Ca-Ag double layer', Appl. Phys. Lett., Vol. 84, No. 23, p. 4604, 2004
  14. Q. Huang, K. Walzer, M. Pfeiffer, V. Lyssenko, G. He, and K. Leo, 'Highly efficient top emitting organic light-emitting diode with organic outcoupling enhancement layers', Appl. Phys. Lett., Vol. 88, p. 113515, 2006 https://doi.org/10.1063/1.2185468