Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Deep Blue Fluorescent Host Materials Based on a Novel Spiro[benzo[c]fluorene-7,9'-fluorene] Core Structure with Side Aromatic Wings

  • Lee, In-Ho (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University) ;
  • Seo, Jeong-A (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University) ;
  • Gong, Myoung-Seon (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
  • Received : 2012.03.24
  • Accepted : 2012.04.09
  • Published : 2012.07.20
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Abstract

Deep blue fluorescent host materials based on a novel spiro[benzo[c]fluorene-7,9'-fluorene] core structure with side aromatic wings in the 5- and 9-positions, namely, 5,9-di(naphthalen-2-yl)spiro[benzo[c]fluorene-7,9'-fluorene] (DN-SBFF), 5,9-bis(4-t-butylphenyl)spiro[benzo[c]fluorene-7,9'-fluorene] (BP-SBFF), and 5,9-bis(4-fluorophenyl)spiro[benzo[c]fluorene-7,9'-fluorene] (FP-SBFF), were designed and successfully prepared using the Suzuki reaction. The physical properties of these materials and their EL characteristics as blue host materials doped with N,N,N',N'-tetraphenylspiro[benzo[c]fluorene-7,9'-fluorene]-5,9-diamine (TPA-SBFF) were investigated. The device used comprised ITO/N,N'-diphenyl-N,N'-bis[4-(phenyl-m-tolyl-amino)phenyl]-biphenyl-4,4'-diamine (DNTPD)/N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (NPB)/(FP-SBFF):dopant x%/tris(8-hydroxyquinoline)aluminum ($Alq_3$)/LiF. The device obtained using FP-SBFF doped with TPA-SBFF showed high color purity (0.13, 0.18) and an efficiency of 6.61 cd/A at 7 V.

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References

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