Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of Iridium-Containing Green Phosphorescent Polymers for PLEDs

  • Xu, Fei (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Hee Un (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) ;
  • Lim, Jong Min (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Hwang, Ju Hyun (Convergence Components & Materials Laboratory, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Cho, Nam Sung (Convergence Components & Materials Laboratory, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Lee, Jeong-Ik (Convergence Components & Materials Laboratory, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Hwang, Do-Hoon (Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University)
  • Received : 2012.09.10
  • Accepted : 2012.11.09
  • Published : 2013.02.20
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Abstract

Two series of new green phosphorescent polymers bearing a bis(2-phenyl-pyridine)iridium(III)(dibenzoylmethane) [$(ppy)_2Irdbm$] complex were designed and synthesized. Poly-carbazole (PCbz) derivative or polyfluorene with pendant carbazole groups (PFCbz) were employed as host polymers for the iridium complex. The iridium complex monomer was copolymerized with the host monomers using varying monomer ratios via a Yamamoto coupling reaction. Efficient energy transfer from host to dopant unit was observed by increasing the ratio of the iridium guest in the copolymers. Electroluminescent devices with the configuration ITO/PEDOT:PSS/polymer/BmPyPB/LiF/Al were fabricated and characterized. The phosphorescent polymers composed of the iridium complex guest and polyfluorene with carbazole pendants as a host performed better than the polymers composed of the same guest and the main chain polycarbazole host. A maximum external quantum efficiency of 0.73%, a luminous efficiency of 1.21 cd/A, and a maximum luminance of 372 $cd/m^2$ were obtained from a device fabricated using one of the synthesized copolymers.

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