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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The Study of Dielectric Layer Design for Luminance Efficiency of White Organic Light Emitting Device

백색 OLED의 발광효율 향상을 위한 Dielectric Layer 설계에 관한 연구

  • 김상기 (전남대학교 전기공학과) ;
  • ;
  • 구할본 (전남대학교 전기공학과)
  • Received : 2009.09.03
  • Accepted : 2009.09.23
  • Published : 2009.10.01
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Abstract

We have optimized the device structure by using the dielectric layer such as anti-reflection thin film to improve the emitting efficiency of white organic light emitting device (WOLED). Basically, dielectric layer with anti-reflection characteristics can enhance the emitting efficiency of WOLED by compensating the refractive index of organic layer, ITO, and Glass. Here, WOLED was designed and optimized by Macleod simulator. The refractive index of 1.74 was calculated for Dielectric layer and was selected as $TiO_2$. The optimal thicknesses of $TiO_2$ and ITO were 119.3 and 166.6 nm, respectively, at the wavelength of 600 nm. The transmittance of ITO was measured with the thickness variation of dielectric layer and ITO in Organic layer/ITO/Dielectric layer structure. The transmittance of ITO was 95.17% and thicknesses of $TiO_2$ and ITO were 119.3 and 166.6 nm, respectively. This result, calculated and measured values were coincided.

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References

  1. 장지향, 김경조, 김진헌, 오민철, “마이크로 렌즈 어레이와 회절격자 레지스트 패턴을 이용한 유기광원의 광 추출 효율 향상”, 한국광학회지, 18권, 6호, p. 441, 2007. 10
  2. S. Moller and S. R Forrest, “Improved light out-coupling in OLED employing ordered microlens arrays”, J. Appl. Phy., Vol. 91, No. 5, p. 3324, 2002. https://doi.org/10.1063/1.1435422
  3. P. K. H. Ho, J. S. Kim, J. H. Burroughes, H. Becker, S. F. Y. Li, T. M. Brown, F. Cacialli, and R. H. Friend, "Molecular-scale interface engineering for polymer lightemitting diodes", Nature, Vol. 404, p. 481, 2000. https://doi.org/10.1038/35006610
  4. W. Li, Q. Wang, J. Cui, H. Chou, S. E. Shaheen, G. E. Jabbour, J. Anderson, P. Lee, B. Kippelen, N. Peyghambarian, N. R. Armstrong, and T. J. Marks, "Covalently interlinked organic LED transport layers via spin-coating/siloxane condensation", Adv. Mater., Vol. 11, p. 730, 1999. https://doi.org/10.1002/(SICI)1521-4095(199906)11:9<730::AID-ADMA730>3.0.CO;2-T
  5. H. Riel, S. Karg, T. Beierlein, W. Rieß, and K. Neyts, “Tuning the emission characteristics of top-emitting organic light-emitting devices by means of a dielectric capping layer”, J. Appl. Phys., Vol. 94, Iss. 8, p. 5290, 2003. https://doi.org/10.1063/1.1605256
  6. H. A. Macleod, "Thin-film Opticla Filters, Institute of Physics Publishing, 2nd ed., p. 300, 1986.
  7. 기현철, 김상기, 김은미, 박경희, 구할본, “Index matching film이 적용된 ITO 투과율 특성에 관한 연구”, 한국전기전자재료학회 2009하계학술대회논문집, p. 307, 2009.