Synthesis and characterization of dinuclear europium complexes showing pure red electroluminescence

Hyosook Jang, Chang Hwan Shin, Byung Jun Jung, Do Hyeon Kim, Hong Ku Shim, Youngkyu Do

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Abstract

Two dinuclear EuIII complexes have been synthesized by employing β-diketones and 2,2′-bipyrimidine (bpm) as sensitizing ligands for the Eu ion and a bridging ligand, respectively, and characterized by various means including single-crystal X-ray crystallography. The use of dibenzoylmethane (dbm) and trifluorothenoylacetone (tta) as β-diketones gave [Eu2(dbm)6(bpm)] (1) and [Eu2(tta) 6(bpm)] (2). Both show strong intermolecular π-π interactions that may be responsible for their high melting points. The analysis of the absorption, excitation, and emission spectra of the dinuclear complexes along with a comparison with analogous mononuclear complexes containing the same β-diketone ligands and 1,10-phenanthroline (phen) suggests that the dinuclear complexes follow the luminescence mechanism of general Ln III complexes. An EL device with the structure ITO/PEDOT/PVK + PBD + 1 10 wt.-%/LiF/Al shows pure red emission with an efficiency similar to those of mononuclear complexes.

Original languageEnglish
Pages (from-to)718-725
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number4
DOIs
StatePublished - 20 Feb 2006

Keywords

  • 2,2′-Bipyrimidine
  • Dinuclear complexes
  • Electroluminescence
  • Europium

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