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Simplified Bilayer White Phosphorescent Organic Light-Emitting Diodes

  • Lee, Jonghee (ICT & Materials & Components Research Laboratory, ETRI) ;
  • Sung, Woo Jin (ICT & Materials & Components Research Laboratory, ETRI) ;
  • Joo, Chul Woong (ICT & Materials & Components Research Laboratory, ETRI) ;
  • Cho, Hyunsu (ICT & Materials & Components Research Laboratory, ETRI) ;
  • Cho, Namsung (ICT & Materials & Components Research Laboratory, ETRI) ;
  • Lee, Ga-Won (Department of Electronics Engineering, Chungnam National University) ;
  • Hwang, Do-Hoon (Department of Chemistry, Pusan National University) ;
  • Lee, Jeong-Ik (ICT & Materials & Components Research Laboratory, ETRI)
  • Received : 2015.07.15
  • Accepted : 2015.09.07
  • Published : 2016.04.01

Abstract

We report on highly efficient blue, orange, and white phosphorescent organic light-emitting diodes consisting only two organic layers. Hole transporting 4, 4,' 4"-tris (N-carbazolyl)triphenylamine (TcTa) and electron transporting 2-(diphenylphosphoryl) spirofluorene (SPPO1) are used as an emitting host for orange light-emitting bis(3-benzothiazol-2-yl-9-ethyl-9H-carbazolato) (acetoacetonate) iridium ((btc)2(acac)Ir) and blue light-emitting iridium(III)bis(4,6-difluorophenyl-pyridinato-N,C2') picolinate (FIrpic) dopant, respectively. Combining these two orange and blue light-emitting layers, we successfully demonstrate highly efficient white PHOLEDs while maintaining Commission internationale de l'eclairage coordinates of (x = 0.373, y = 0.443). Accordingly, we achieve a maximum external quantum, current, and power efficiencies of 12.9%, 30.3 cd/A, and 30.0 lm/W without out-coupling enhancement.

Keywords

References

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