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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Numerical Simulations of Electric-Optical Characteristics for Organic Light Emitting Diode with Gradient-Doped Emitting Layer

경사 도핑된 발광층을 갖는 유기발광다이오드의 전기광학적 특성 해석

  • Lee, Young-Gu (R&D Promotion Team, Cheorwon Plasma Research Institute) ;
  • Oh, Tae-Sik (Department of Information Display, Sun Moon University)
  • 이영구 (철원플라즈마 산업기술연구원 연구개발진흥팀) ;
  • 오태식 (선문대학교 정보디스플레이학과)
  • Received : 2010.05.13
  • Accepted : 2010.06.14
  • Published : 2010.08.01
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Abstract

We have carry out numerical simulation of the electric-optical characteristics of organic light emitting diodes with gradient-doped emitting layer which were reported to be effective in improving luminous efficiency and lifetime. In this paper, the basic structure is comprised of ITO/NPB/$Alq_3$:C545T[%]/$Alq_3$/LiF/Al, six devices by separating the emitting layer of $Alq_3$:C545T[%] were studied. As the result, the uniformly-doped devices exhibited superior luminous efficiency-current density characteristics over conventional undoped device. In the case of gradient-doped devices, electric-optical characteristics were improved similar to uniformed-doped devices, unusually the distribution of traped-charge density in the OLED devices was shown as the staircase.

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References

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