Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of Red Electrophosphorescent Polymers Containing Pendant Iridium(III) Complex Moieties

  • Xu, Fei (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Mi, Dongbo (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Bae, Hong Ryeol (Department of Information Display and Advanced Display Research Center, Kyung Hee University) ;
  • Suh, Min Chul (Department of Information Display and Advanced Display Research Center, Kyung Hee University) ;
  • Yoon, Ung Chan (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Hwang, Do-Hoon (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
  • Received : 2013.04.16
  • Accepted : 2013.06.06
  • Published : 2013.09.20
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Abstract

A series of fluorene-carbazole copolymers containing the pendant phosphor chromophore $Ir(absn)_2(acac)$ (absn: 2-(1-naphthyl)benzothiazole; acac: acetylacetone) were designed and synthesized via Yamamoto coupling. In the film state, these copolymers exhibited absorption and emission peaks at approximately 389 and 426 nm, respectively, which originated from the fluorene backbone. However, in electroluminescent (EL) devices, a significantly red-shifted emission at approximately 611 nm was observed, which was attributed to the pendant iridium(III) complex. Using these copolymers as a single emission layer, polymer light-emitting devices with ITO/PEDOT:PSS/polymer:DNTPD/TmPyPb/LiF/Al configurations exhibited a saturated red emission at 611 nm. The attached iridium(III) complex had a significant effect on the EL performance. A maximum luminous efficiency of 0.85 cd/A, maximum external quantum efficiency of 0.77, maximum power efficiency of 0.48 lm/W, and maximum luminance of 883 $cd/m^2$ were achieved from a device fabricated with the copolymer containing the iridium(III) complex in a 2% molar ratio.

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