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Low Voltage Driving White OLED with New Electron Transport Layer

New ETL 층에 의한 저전압 구동 백색 발광 OLED

  • 문대규 (순천향대학교 디스플레이신소재공학과)
  • Published : 2009.03.01

Abstract

We have developed low driving voltage white organic light emitting diode with a new electron transport material, triphenylphosphine oxide ($Ph_{3}PO$). The white light emission was realized with a rubrene yellow dopant and blue-emitting DPVBi layer. The new electron transport layer results in a very high current density at low voltage, resulting in a reduction of driving voltage. The device with a new electron transport layer shows a brightness of $1150\;cd/m^2$ at a low driving voltage of 4.3 V.

Keywords

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, '버퍼층과 음전극에 따른 유기 발광 소자의 전기적 특성과 발광 효율', 전기전자재료학회논문지, 16권, 5호, p. 409, 2003 https://doi.org/10.4313/JKEM.2003.16.5.409
  3. M. A. Baldo, D. F. O'Brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, and S. R. Forrest, 'Highly efficient phosphorescent emission from organic electroluminescence', Nature, Vol. 395, p. 151, 1998 https://doi.org/10.1038/25954
  4. S. Tokito, T. Iijima, T. Tsuzuki, and F. Sato, 'High-efficiency white phosphorescent organic light-emitting devices with greenish- blue and red-emitting layers', Appl. Phys. Lett., Vol. 83, No. 12, p. 2459, 2003 https://doi.org/10.1063/1.1611620
  5. L. S. Hung, C. W. Tang, and M. G. Mason, 'Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrode', Appl. Phys. Lett., Vol. 70, No. 2, p. 152, 1997 https://doi.org/10.1063/1.118344
  6. A. Ioannidis, E. Forsythe, Y. Gao, M. W. Wu, and E. M. Conwell, 'Current-voltage characteristic of organic light emitting diodes', Appl. Phys. Lett., Vol. 72, No. 23, p. 3038, 1998 https://doi.org/10.1063/1.121533
  7. M. Y. Ha and D. G. Moon, 'Low voltage organic light-emitting devices with triphenyl- phosphine oxide layer', Vol. 93, p. 043306, 2008 https://doi.org/10.1063/1.2960348
  8. J. H. Lee, M. H. Wu, C. C. Chao, H. L. Chen, and M. K. Leung, 'High efficiency and long lifetime OLED based on a metal-doped electron transport layer', Chem. Phys. Lett., Vol. 416, p. 234, 2005 https://doi.org/10.1016/j.cplett.2005.09.104
  9. Z. Liu, O. V. Salata, and N. Male, 'Improved electron injection in organic LED with lithium quinolate/aluminium cathode', Synth. Metals, Vol. 128, p. 211, 2002 https://doi.org/10.1016/S0379-6779(02)00011-5
  10. N. Naka, H. Okada, H. Onnagawa, Y. Yamaguchi, and T. Tsutsui, 'Carrier transport properties of organic materials for EL device operation', Synth. Metals, Vol. 111, p. 331, 2000 https://doi.org/10.1016/S0379-6779(99)00358-6
  11. S. Nata, H. Okada, H. Onnagawa, and T. Tsutsui, 'High electron mobility in bathophenanthroline', Appl. Phys. Lett., Vol. 76, No. 2, p. 197, 2000 https://doi.org/10.1063/1.125701
  12. Y. Hamada, T. Sano, K. Shibata, and K. Kuroki, 'Influence of the emission site on the running durability of organic electrol- uminescent devices', Jpn. J. Appl. Phys., Vol. 34, p. L824, 1995 https://doi.org/10.1143/JJAP.34.L824
  13. J. Huang, M. Pfeiffer, A. Werner, J. Blochwitz, and K. Leo, 'Low-voltage organic electroluminescent devices using pin structures', Appl. Phys. Lett., Vol. 80, No. 1, p. 139, 2002 https://doi.org/10.1063/1.1432110
  14. K. Walzer, B. Maennig, M. Pfeiffer, and K. Leo, 'Highly efficient organic devices based on electrically doped transport layers', Chem. Rev., Vol. 107, p. 1233, 2007 https://doi.org/10.1021/cr050156n
  15. E. I. Hasakal, A. Curioni, P. F. Seidler, and W. Andreoni, 'Lithium-aluminum contacts for organic light-emitting devices', Appl. Phys. Lett., Vol. 71, No. 9, p. 1151, 1997 https://doi.org/10.1063/1.119850
  16. M. Y. Ha and D. G. Moon, 'Low voltage organic light emitting devices with triphenylphosphine oxide layer', Appl. Phys. Lett., Vol. 93, p. 043306, 2008 https://doi.org/10.1063/1.2960348
  17. H. Murata, C. D. Merritt, and Z. H. Kafafi, 'Emission mechanism in rubrene-doped molecular organic light-emitting diodes : direct carrier recombination at luminescent centers', IEEE J. Sel. Quantum Elect., Vol. 4, No. 1, p. 119, 1998 https://doi.org/10.1109/2944.669481
  18. C. Hosokawa, H. Higashi, H. Nakamura, and T. Kusumoto, 'Highly efficient blue electroluminescence from a distyrylarylene emitting layer with a new dopant', Appl. Phys. Lett., Vol. 67, No. 26, p. 3853, 1995 https://doi.org/10.1063/1.115295