Enhancement of the efficiency stabilization and the color coordinates in blue organic light-emitting devices with double emitting layers

  • Bang, H.S. (Research Institute of Information Display, Division of Electronics and Computer Engineering, Hanyang University) ;
  • Han, S.M. (Department of Information Display Engineering, Hanyang University) ;
  • Lee, D.U. (Research Institute of Information Display, Division of Electronics and Computer Engineering, Hanyang University) ;
  • Kim, T.W. (Research Institute of Information Display, Division of Electronics and Computer Engineering, Hanyang University) ;
  • Kim, J.H. (Department of Electronics, Hong-ik University) ;
  • Seo, J.H. (Department of Information Display Engineering & Center for Organic Materials & Information Display (COMID), Hong-ik University) ;
  • Kim, Y.K. (Department of Information Display Engineering & Center for Organic Materials & Information Display (COMID), Hong-ik University)
  • Published : 2006.08.22

Abstract

The efficiency stabilization and the color coordinates in blue organic light-emitting devices (OLEDs) with a double emitting layer (DEL) consisting of 4,4'-Bis(carbazol-9-yl)biphenyl (CBP) and 4,4'-Bis(2,2-diphenyl-ethen-1-yl)diphenyl were investigated. The efficiency of the OLEDs with a DEL did not significantly change with an increase in current density. The Commission Internationale de l'Eclairage coordinates of the OLEDs with a DEL 11 V were (0.150, 0.137), indicative of a deep blue color.

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