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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Efficiency Improvement of OLEDs depending on the Hole-size of Crucible Boat

Crucible Boat의 홀 크기에 따른 유기발광소자의 효율 개선

  • 김원종 (광운대학교 전기응용연구실) ;
  • 홍진웅 (광운대학교 전기응용연구실)
  • Published : 2008.06.01
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Abstract

In the device structure of ITO/tris(8-hydroxyquinoline) aluminum ($Alq_3$)/Al device, we investigated the efficiency improvement of organic light-emitting diodes (OLEDs) depending on the hole-size of crucible boat. The device was manufactured using a thermal evaporation under the base pressure of $5{\times}10^{-6}\;Torr$. The $Alq_3$ organics were evaporated to be 100 nm thick at a deposition rate of $1.5\AA/s$, and in order to investigate the optimal surface roughness of $Alq_3$, the $Alq_3$ was thermally evaporated to be 0.8 mm, 1.0 mm, and 1.5 mm as a hole-size of the boat, respectively. We found that luminance and external quantum efficiency are superior when the hole-size of the boat is 1.0 mm. The external quantum efficiency of the device made with the hole-size of 1.0 mm boat were improved by a factor of ten compared to the devices made with the hole-size of non boat.

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References

  1. G. B. Blanchet, Y. L. Loo, J. A. Rogers, F. Gao, and C. R. Fincher, "Large area, high resolution, dry printing of conducting polymers for organic electronics", Appl. Phys. Lett., Vol. 82, p. 463, 2003 https://doi.org/10.1063/1.1533110
  2. W. J. Kim, J. H. Yang, T. Y. Kim, J. Jeong, Y. H. Lee, H. Y. Park, T. W. Kim, and J. W. Hong, "Efficiency improvement of organic light-emitting diodes depending on thickness of hole injection materials", Trans. EEM, Vol. 6, No. 5, p. 233, 2005 https://doi.org/10.4313/TEEM.2005.6.5.233
  3. Y. H. Lee, W. J. Kim, T. Y. Kim, J. Jeong, H. D. Park, T. W. Kim, and J. W. Hong, "Electrical characteristics and efficiency of organic light-emitting diodes depending on hole-injection layer", Curr. Appl. Phys., Vol. 7, p. 409, 2007 https://doi.org/10.1016/j.cap.2006.09.021
  4. T. W. Choi and S. C. Yoo, "Electrical and mechanical properties of ceramics", J. Mater. Sci., Vol. 15, No. 1, p. 10, 2001
  5. S. K. Kim, J. W. Hong, and T. W. Kim, "Current voltage characteristics of organic light emitting diodes with a variation of temperature", Trans. KIEE., Vol. 51-C-7, 2002
  6. C. W. Tang and S. A. VanSlyke, "Organic electroluminescent diodes", Appl. Phys. Lett., Vol. 51, p. 913, 1987 https://doi.org/10.1063/1.98799
  7. W. J. Kim, Y. H. Lee, J. H. Yang, T. Y. Kim, T. W. Kim, and J. W. Hong, "Electrical characteristics and luminous efficiency of OLEDs depending on the hole injectioon layer", ME&D-16, p. 85, 2005
  8. W. J. Kim, Y. H. Lee, T. Y. Kim, T. W. Kim, and J. W. Hong, "Dependence of efficiency improvement and operating-voltage reduction of OLEDs on thickness variation in the PTFE hole-injection layer", J. Korean. Phys. Soc., Vol. 51, No. 3, p. 1007, 2007 https://doi.org/10.3938/jkps.51.1007
  9. Y. H. Lee, W. J. Kim, T. Y. Kim, T. W. Kim, and J. W. Hong, "Electrical and optical characteristics of organic light-emitting diodes for various thickness of the PTFE Layer", J. Korean. Phys. Soc., Vol. 51, No. 3, p. 1016, 2007 https://doi.org/10.3938/jkps.51.1016
  10. I. D. Parker, "Device characteristics in polymer light-emitting diodes", J. Appl. Phys., Vol. 75, p. 1656, 1994 https://doi.org/10.1063/1.356350
  11. Y. Qiu and D. Q. Zhang, "Dependence of the performance of the organic electro luminescent devices upon the deposition rate of organic thin films", Synth. Metals., Vol. 110, p. 241. 2000 https://doi.org/10.1016/S0379-6779(99)00300-8

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