Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Heteroleptic Phosphorescent Iridium(III) Compound with Blue Emission for Potential Application to Organic Light-Emitting Diodes

  • Oh, Sihyun (Division of Science Education & Department of Chemistry, Kangwon National University) ;
  • Jung, Narae (Division of Science Education & Department of Chemistry, Kangwon National University) ;
  • Lee, Jongwon (Division of Science Education & Department of Chemistry, Kangwon National University) ;
  • Kim, Jinho (Division of Science Education & Department of Chemistry, Kangwon National University) ;
  • Park, Ki-Min (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kang, Youngjin (Division of Science Education & Department of Chemistry, Kangwon National University)
  • Received : 2014.08.02
  • Accepted : 2014.08.26
  • Published : 2014.12.20
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Abstract

Blue phosphorescent $(dfpypy)_2Ir(mppy)$, where dfpypy = 2',6'-difluoro-2,3'-bipyridine and mppy = 5-methyl-2-phenylpyridine, has been synthesized by newly developed effective method and its solid state structure and photoluminescent properties are investigated. The glass-transition and decomposition temperature of the compound appear at $160^{\circ}C$ and $360^{\circ}C$, respectively. In a crystal packing structure, there are two kinds of intermolecular interactions such as hydrogen bonding ($C-H{\cdots}F$) and edge-to-face $C-H{\cdots}{\pi}(py)$ interaction. This compound emits bright blue phosphorescence with ${\lambda}_{max}=472nm$ and quantum efficiencies of 0.23 and 0.32 in fluid and the solid state. The emission band of the compound is red-shifted by 40 nm relative to homoleptic congener, $Ir(dfpypy)_3$. The ancillary ligand in $(dfpypy)_2Ir(mppy)$ has been found to significantly destabilize HOMO energy, compared to $Ir(dfpypy)_3$, $(dfpypy)_2Ir(acac)$ and $(dfpypy)_2Ir(dpm)$, without significantly changing LUMO energy.

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References

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