Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis of 5,6-Dihydro[1,10]phenanthroline Derivatives and Their Properties as Hole-Blocking Layer Materials for Phosphorescent Organic Light-Emitting Diodes

  • Lee, Hyo-Won (Department of Chemistry, Chungbuk National University) ;
  • An, Jung-Gi (Department of Chemistry, Chungbuk National University) ;
  • Yoon, Hee-Kyoon (Department of Chemistry, Chungbuk National University) ;
  • Jang, Hyo-Sook (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, KAIST) ;
  • Kim, Nam-Gwang (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, KAIST) ;
  • Do, Young-Kyu (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, KAIST)
  • Published : 2005.10.20
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Abstract

To develop new hole-blocking materials for phosphorescent organic light-emitting diodes (PhOLEDs), 5,6-dihydro-2,9-diisopropyl-4,7-diphenyl[1,10]phenanthroline (1) and 5,6-dihydro-2,9-diisopropyl-4-(4-methoxyphenyl)-7-phenyl[1,10]phenanthroline (2) were synthesized. While the absorption spectrum of 1 is very similar to that of 2, the photoluminescence spectrum of 1 has the feature of the narrower and blue-shifted blueviolet emission at the peak of 356 nm compared to that of 2. The HOMO and LUMO energy levels of 1 and 2 were estimated from the measurement of cyclic voltammetry, and 1 has the appropriate levels for a holeblocking layer (HBL). The use of 1 as a HBL in a green PhOLED led to good efficiency of 23.6 cd/A at 4.4 mA/$cm^2$.

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References

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