Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Studies on the Electrical and Optical Characterization of Organic Electroluminescent Devices using $Eu(TTA)_3(phen)$

Europium complex를 이용한 유기 전기 발광 소자의 전기적 및 광학적 특성에 관한 연구

  • Lee, Myung-Ho (School of Electronics & Electrical Eng., Hongik University) ;
  • Pyo, Sang-Woo (School of Electronics & Electrical Eng., Hongik University) ;
  • Lee, Han-Sung (School of Electronics & Electrical Eng., Hongik University) ;
  • Kim, Young-Kwan (Dept. of Chemical Eng., Hongik University) ;
  • Kim, Jung-Soo (School of Electronics & Electrical Eng., Hongik University)
  • 이명호 (홍익대학교 전자전기공학부) ;
  • 표상우 (홍익대학교 전자전기공학부) ;
  • 이한성 (홍익대학교 전자전기공학부) ;
  • 김영관 (홍익대학교 화학공학과) ;
  • 김정수 (홍익대학교 전자전기공학부)
  • Published : 1998.07.20
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Abstract

Electroluminescent(EL) devices based on organic materials have been of great interest due to their possible applications for large-area flat-panel displays. They are attractive because of their capability of multicolor emission, and low operation voltage. In this study, glass substrate/ITO/TPD/$Eu(TTA)_3(phen)/Alq_3/Al$ structures were fabricated by evaporation method, where aromatic diamine(TPD) were used as a hole transporting material, $Eu(TTA)_3(phen)$ as an emitting material, and tris(8-hydroxyquinoline)Aluminum ($Alq_3$) as an electron transporting layer. Electroluminescent(EL) and I-V characteristics of $Eu(TTA)_3(phen)$ with a variety thickness was investigated. This structure shows the red EL spectrum, which is almost the same as the PL spectrum of $Eu(TTA)_3(phen)$. I-V characteristics of this structure show that turn-on voltage was 9V and current density of $0.01A/cm^2$ at a dc drive voltage of 9V. Details on the explanation of electrical transport phenomena of these structures with I-V characteristics using the trapped-charge-limited current model will be discussed.

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