Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Current-Voltage-Luminance Characteristics of Organic Light-Emitting Diodes with a Variation of PVK Concentration Used as a Buffer Layer

버퍼층으로 사용한 PVK의 농도 변화에 따른 유기 발광 소자의 전압-전류-휘도 특성

  • Published : 2002.03.31
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Abstract

We have seen the effects of buffer layer in organic light-emitting diodes(OLEDs) using poly(N-vinylcarbazole)(PVK) depending on a concentration of PVK. Polymer PVK buffer layer was made using spin casting technique. Two device structures were fabricated; one is ITO/TPD/$Alq_{3}$/Al as a reference, and the other is ITO/PVK/TPD/$Alq_{3}$/Al to see the effects of buffer layer in organic light-emitting diodes. Current-voltage-luminance characteristics and an external quantum efficiency were measured with a variation of spin-casting rpm speeds and PVK concentration. We have obtained an improvement of external quantum efficiency by a factor of four when the PVK concentration is 0.1wt% is used. The improvement of efficiency is expected due to a function of hole-blocking of PVK in OLEDs.

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References

  1. P. S. Vincett, W. A. Barlow, R. A. Hann, and G. G. Roberts, Thin Solid Films, 94, 171 (1982) https://doi.org/10.1016/0040-6090(82)90509-0
  2. C. W. Tang and S. A. VanSlyke, AppI. Phys. Lett, 51, 913 (1987) https://doi.org/10.1063/1.98799
  3. C. W. Tang, S. A. VanSlyke, and C. H. Chen, J. AppI. Phys., 65, 3610 (1989) https://doi.org/10.1063/1.343409
  4. C. Adachi, T. Tsutsni, and S. Saito, AppI. Pbys. Lett., 56, 799 (1990) https://doi.org/10.1063/1.103177
  5. J. R. Sheats, H. Antoniadis, M. Hueschen, W. Leonard, J. . Miller, R. Moon, D. Roitman, and A. Stocking, Science, 273, 884 (1996) https://doi.org/10.1126/science.273.5277.884
  6. A. J. Makinen. I. G. Hill, R. Shashidhar, N. Nikolov, and Z. H. Kafafi, Appl. Phys. Lett., 79, 557 (2001) https://doi.org/10.1063/1.1386400
  7. C. Hosokawa, H. Higashi, and T. Kusumoto, AppI. Phys. Lett, 62, 3238 (1993) https://doi.org/10.1063/1.109085
  8. Y. Yang and A. J. Heeger, AppI. Phys. Lett., 64, 1245 (1994) https://doi.org/10.1063/1.110853
  9. J. C. Carter, I. Grizzi, S. K. Heeks, D. J. Lacey, S. G. Latham, P. G. May, 0. R. Panos, K. Pichler, C. R. Towns, and H. F. Wittmann, Appl. Phys. Lett, 71, 34 (1997) https://doi.org/10.1063/1.119483
  10. S. Karg, J. C. Scott, J. R. Salem, and M. Angelopoulos, Synth Met, 80, 111 (1996) https://doi.org/10.1016/S0379-6779(96)03690-9
  11. A. Tsuchida, A. Nagata, M. Yamamoto, H. Fukui, M. Sawamoto, and T. Higashimura, Macromolecules, 28, 1285 (1995) https://doi.org/10.1021/ma00108a067