Synthesis and characterization of dinuclear europium complexes showing pure red electroluminescence

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Two dinuclear Eu-III complexes have been synthesized by employing beta-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 beta-diketones gave [Eu-2(dbm)(6)(bpm)] (1) and [Eu-2(tta)(6)(bpm)] (2). Both show strong intermolecular pi-pi 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 beta-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 + 110 wt.-%/LiF/Al shows pure red emission with an efficiency similar to those of mononuclear complexes. (c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2006-02
Language
English
Article Type
Article
Keywords

LIGHT-EMITTING-DIODES; LANTHANIDE COMPLEXES; ORGANIC ELECTROLUMINESCENCE; DIIMINE COMPLEXES; BETA-DIKETONATE; METAL-COMPLEXES; DEVICES; LUMINESCENCE; BRIGHT; EU

Citation

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, no.4, pp.718 - 725

ISSN
1434-1948
DOI
10.1002/ejic.200500438
URI
http://hdl.handle.net/10203/2201
Appears in Collection
CH-Journal Papers(저널논문)
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