Synthesis and green electrophosphorescence of a novel cyclometalated iridium complex in polymer light-emitting diodes

Li Lan Wu, Sung Hao Tsai, Tzung-Fang Guo, Cheng Hsien Yang, I-Wen Sun

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this paper, we synthesized a new complex bis(dibenzo[f,h]quinolinato-N,C2′) iridium(III) acetylactonate ((DBQ)2Ir(acac)) having a longer conjugate system than bis(2-phenylpyridinato-N,C2′) iridium(III) acetylacetonate ((PPY)2Ir(acac)). Interestingly, (DBQ)2Ir(acac) emits at the same wavelength as (photoluminescence of 530 nm) (PPY)2Ir(acac). A high-efficiency electrophosphorescent polymer light-emitting diodes was constructed by using (DBQ)2Ir(acac) as the dopant, and a blend of poly(vinylcarbazole) (PVK) with 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazol (PBD) as the host material. The electroluminescence efficiency of 9.5 cd/A is reported for the device doped with 3 wt% of (DBQ)2Ir(acac). In this device, the emission from the PVK or PBD host was effectively inhibited with the using (DBQ)2Ir(acac) . Emission from the dopant molecules in such devices involve localization of the injected electron and hole on the metal-organic center. This can occur by a variety of mechanisms, including Förster and Dexter energy transfer from the host transport material to the dopant, and direct trapping of both electrons and holes on the metal-organic center.

Original languageEnglish
Pages (from-to)687-694
Number of pages8
JournalJournal of Luminescence
Volume126
Issue number2
DOIs
Publication statusPublished - 2007 Oct 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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