Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electroluminescent Properties of Spiro[fluorene-benzofluorene]-Containing Blue Light Emitting Materials

  • Jeon, Soon-Ok (Department of Chemistry and Institute of Basic Science, Dankook University) ;
  • Lee, Hyun-Seok (Department of Chemistry and Institute of Basic Science, Dankook University) ;
  • Jeon, Young-Min (Department of Chemistry and Institute of Basic Science, Dankook University) ;
  • Kim, Joon-Woo (OLED Team, Daejoo Electronic Materials) ;
  • Lee, Chil-Won (OLED Team, Daejoo Electronic Materials) ;
  • Gong, Myoung-Seon (Department of Chemistry and Institute of Basic Science, Dankook University)
  • Published : 2009.04.20
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Abstract

New spiro[fluorene-7,9′-benzofluorene]-based blue host material, 5-phenyl-spiro[fluorene-7,9′-benzofluorene] (BH-1P), was successfully prepared by reacting 5-bromo-spiro[fluorene-7,9′-benzofluorene] (1) with phenyl boronic acid through the Suzuki reaction. 5-(N,N-Diphenyl)amino-spiro[fluorene-7,9′-benzofluorene] (BH-1DPA) and diphenyl-[4-(2-[1,1;4,1]terphenyl-4-yl-vinyl)-phenyl]amine (BD-1) were used as dopant materials. 2,5-Bis-(2',2"- bipyridin-6-yl)-1,1-diphenyl-3,4-diphenylsilacyclopentadiene (ET4) and Alq3 were used as electron transfer materials. Their UV absorption, photoluminescence and thermal properties were examined. The blue OLEDs with the configuration of ITO/DNTPD/$\alpha$-NPD/BH-1P:5% dopant/$Alq_3$ or ET4/LiF-Al prepared from the BH-1P host and BH-1DPA and BD-1 dopants showed a blue EL spectrum at 452 nm at 10 V and a luminance of 923.9 cd/$m^2$ with an efficiency of 1.27 lm/W at a current density of 72.57 mA/$cm^2$.

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