KIEE International Transactions on Electrophysics and Applications

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

Electrical and Optical Characteristics in Organic Electroluminescent Devices with Different Materials for Electron Injection

  • Cho, Min-Jeong (Department of Electrical Eng., Chungbuk National University) ;
  • Park, wan-Ji (Department of Electrical Eng., Chungbuk National University) ;
  • Lim, Min-Su (Department of Electrical Eng., Chungbuk National University) ;
  • Cheol-Hyun park (Department of Electrical Eng., Chungbuk National University) ;
  • Jeon-Gu lee (Department of Electrical Eng., Chungbuk National University) ;
  • Lim, Kee-Joe (Department of Electrical Eng., Chungbuk National University) ;
  • Park, Soo-Gil (Department of Electrical Eng., Chungbuk National University) ;
  • Kim, Hyun-Hoo (Department of Electrinic Eng., Doowon Technical College)
  • 발행 : 2001.06.01

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초록

In this study, organic electroluminescent devices with the ITO/TPD/Alq$_3$/cathode structure, using various materials of Al, Mg:Ag, Al:Li, MgF$_2$/Al, and LiF/Al as cathodes, were fabricated. We investigated the electrical and optical properties of the devices as follow: current density-voltage(J-V), luminance-voltage(L-V) and luminous efficiency-voltage curves. The bilayer cathodes with LiF/Al and MgF$_2$/Al exhibited better device performance than the other cathodes. It is considered that the improved performance of the organic electroluminescent devices is attributable to the lowering of driving voltage caused by the enhanced electron injection. The alkaline-earth fluorides are desirable materials to improve the performance of the EL devices with the Al cathode, and high luminous efficiency was achieved.

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