한국정보디스플레이학회:학술대회논문집

한국정보디스플레이학회 (The Korean Infomation Display Society)
권호 표지

Highly efficient organic electroluminescent diodes realized by efficient charge balance with optimized Electron and Hole transport layers

  • Khan, M.A. (Department of Materials Science, Shanghai University) ;
  • Xu, Wei (Department of Materials Science, Shanghai University) ;
  • Wei, Fuxiang (Department of Materials Science, Shanghai University) ;
  • Bai, Yu (Department of Materials Science, Shanghai University) ;
  • Jiang, X.Y. (Department of Materials Science, Shanghai University) ;
  • Zhang, Z.L. (Department of Materials Science, Shanghai University, Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University) ;
  • Zhu, W.Q. (Department of Materials Science, Shanghai University, Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University)
  • 발행 : 2007.08.27
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초록

Highly efficient organic electroluminescent devices (OLEDs) based on 4,7- diphenyl-1, 10- phenanthroline (BPhen) as the electron transport layer (ETL), tris (8-hydroxyquinoline) aluminum ($Alq_3$) as the emission layer (EML) and N,$\acute{N}$-bis-[1-naphthy(-N,$\acute{N}$diphenyl-1,1´-biphenyl-4,4´-diamine)] (NPB) as the hole transport layer (HTL) were developed. The typical device structure was glass substrate/ ITO/ NPB/$Alq_3$/ BPhen/ LiF/ Al. Since BPhen possesses a considerable high electron mobility of $5\;{\times}\;10^{-4}\;cm^2\;V^{-1}\;s^{-1}$, devices with BPhen as ETL can realize an extremely high luminous efficiency. By optimizing the thickness of both HTL and ETL, we obtained a highly efficient OLED with a current efficiency of 6.80 cd/A and luminance of $1361\;cd/m^2$ at a current density of $20\;mA/cm^2$. This dramatic improvement in the current efficiency has been explained on the principle of charge balance.

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