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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Interlayer Engineering with Different Host Material Properties in Blue Phosphorescent Organic Light-Emitting Diodes

  • Lee, Jong-Hee (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Lee, Jeong-Ik (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Lee, Joo-Won (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Chu, Hye-Yong (Convergence Components & Materials Research Laboratory, ETRI)
  • Received : 2010.03.22
  • Accepted : 2010.06.10
  • Published : 2011.02.28
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Abstract

We investigated the light-emitting performances of blue phosphorescent organic light-emitting diodes, known as PHOLEDs, by incorporating an N,N'-dicarbazolyl-3,5-benzen interlayer between the hole transporting layer and emitting layer (EML). We found that the effects of the introduced interlayer for triplet exciton confinement and hole/electron balance in the EML were exceptionally dependent on the host materials: 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole, 9-(4-tert-butylphenyl)-3,6-ditrityl-9H-carbazole, and 4,4'-bis-triphenylsilanyl-biphenyl. When an appropriate interlayer and host material were combined, the peak external quantum efficiency was greatly enhanced by over 21 times from 0.79% to 17.1%. Studies on the recombination zone using a series of host materials were also conducted.

Keywords

References

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