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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Optical Thin Film and Micro Lens Design for Efficiency Improvement of Organic Light Emitting Diode

유기 발광소자의 효율 향상을 위한 광학박막 및 마이크로렌즈 설계

  • Ki, Hyun-Chul (Korea Photonics Technology Institute Photonics Fusion System Research Center) ;
  • Kim, Doo-Gun (Korea Photonics Technology Institute Photonics Fusion System Research Center) ;
  • Kim, Seon-Hoon (Korea Photonics Technology Institute Photonics Fusion System Research Center) ;
  • Kim, Sang-Gi (Linkline I&C) ;
  • Park, A-Reum (Department of Electrical Engineering, Chonnam National University) ;
  • Gu, Hal-Bon (Department of Electrical Engineering, Chonnam National University)
  • 기현철 (한국광기술원 광융합시스템 연구센터) ;
  • 김두근 (한국광기술원 광융합시스템 연구센터) ;
  • 김선훈 (한국광기술원 광융합시스템 연구센터) ;
  • 김상기 ((주) 링크라인아이엔씨) ;
  • 박아름 ((주) 전남대학교 전기공학과) ;
  • 구할본 ((주) 전남대학교 전기공학과)
  • Received : 2011.07.26
  • Accepted : 2011.09.24
  • Published : 2011.10.01
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Abstract

We have proposed an optical thin film and micro lens to improve the luminance of organic light emitting device. The first method, optical thin film was calculated refractive index of dielectric layer material that was modulated refractive index of organic material, ITO (indium tin oxide)and glass. The second method, microlens was applied with lenses on the organic device. Optical thin films were designed with Macleod Simulator and Micro Lenses were calculated by FDTD (finite-difference time-domain) solution. The structure of thin film was designed in organic material/ITO/dielectric layer/glass. The lenses size, height and distance were 5 ${\mu}m$, 1 ${\mu}m$, 1 ${\mu}m$, respectively. The material of micro lenses used silicon dioxide. Result, The highest luminance of OLED which applied with microlens was 11,185 $cd/m^2$, when approval voltage was 14.5 V, applied thin film was 5,857 $cd/m^2$. The device efficiency applying microlens increased 3 times than the device which does not apply microlens.

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References

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