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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An Efficiency Improvement of the OLEDs due to the Thickness Variation on Hole-Injection Materials

정공주입물질 두께 변화에 따른 유기발광다이오드의 효율 개선

  • Shin, Jong-Yeol (Department of Car-Mechatronics, Sahmyook University) ;
  • Guo, Yi-Wei (Department of Electric Engineering, Kwangwoon University) ;
  • Kim, Tae-Wan (Department of Information Display Engineering, Hongik University) ;
  • Hong, Jin-Woong (Department of Electric Engineering, Kwangwoon University)
  • 신종열 (삼육대학교 카메카트로닉스학과) ;
  • 곽의위 (광운대학교 전기공학과) ;
  • 김태완 (홍익대학교 정보디스플레이공학과) ;
  • 홍진웅 (광운대학교 전기공학과)
  • Received : 2015.03.31
  • Accepted : 2015.04.22
  • Published : 2015.05.01
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Abstract

A new information society of late has arrived by the rapid development of various information & communications technologies. Accordingly, mobile devices which are light and thin, easy and convenient to carry on the market. Also, the requirements for the larger television sets such as fast response speed, low-cost electric power, wider visual angle display are sufficiently satisfied. The currently most widely studied display material, the Organic Light-emitting Diodes(OLEDs) overwhelms the Liquid Crystal Display(LCD), the main occupier of the market. This new material features a response speed of more than a thousand times faster, no need of backlight, a low driving voltage, and no limit of view angle. And the OLEDs has high luminance efficiency and excellent durability and environment resistance, quite different from the inorganic LED light source. The OLEDs with simple device structure and easy produce can be manufactured in various shapes such as a point light source, a linear light source, a surface light source. This will surely dominate the market for the next generation lighting and display device. The new display utilizes not the glass substrate but the plastic one, resulting in the thin and flexible substrate that can be curved and flattened out as needed. In this paper, OLEDs device was produced by changing thickness of Teflon-AF of hole injection material layer. And as for the electrical properties, the four layer device of ITO/TPD/$Alq_3$/BCP/LiF/Al and the five layer device of ITO/Teflon AF/TPD/$Alq_3$/BCP/Lif/Al were studied experimentally.

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References

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