Synthesis and characterization of red electrophosphorescent polymers containing pendant iridium(III) complex moieties

Fei Xu, Dongbo Mi, Hong Ryeol Bae, Min Chul Suh, Ung Chan Yoon, Do Hoon Hwang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)2609-2615
Number of pages7
JournalBulletin of the Korean Chemical Society
Volume34
Issue number9
DOIs
Publication statusPublished - 20 Sept 2013

Keywords

  • Fluorene
  • Iridium(III) complex
  • Phosphorescent polymer light-emitting device

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