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

doi:10.1002/ejic.200500438

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

Department of Materials Science and Engineering

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

Two dinuclear Eu^III 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 language	English
Pages (from-to)	718-725
Number of pages	8
Journal	European Journal of Inorganic Chemistry
Issue number	4
DOIs	https://doi.org/10.1002/ejic.200500438
State	Published - 20 Feb 2006

Keywords

2,2′-Bipyrimidine
Dinuclear complexes
Electroluminescence
Europium

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title = "Synthesis and characterization of dinuclear europium complexes showing pure red electroluminescence",

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.",

keywords = "2,2′-Bipyrimidine, Dinuclear complexes, Electroluminescence, Europium",

author = "Hyosook Jang and Shin, {Chang Hwan} and Jung, {Byung Jun} and Kim, {Do Hyeon} and Shim, {Hong Ku} and Youngkyu Do",

year = "2006",

month = feb,

day = "20",

doi = "10.1002/ejic.200500438",

language = "English",

pages = "718--725",

journal = "European Journal of Inorganic Chemistry",

issn = "1434-1948",

publisher = "Wiley-VCH Verlag",

number = "4",

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T1 - Synthesis and characterization of dinuclear europium complexes showing pure red electroluminescence

AU - Jang, Hyosook

AU - Shin, Chang Hwan

AU - Jung, Byung Jun

AU - Kim, Do Hyeon

AU - Shim, Hong Ku

AU - Do, Youngkyu

PY - 2006/2/20

Y1 - 2006/2/20

N2 - 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.

AB - 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.

KW - 2,2′-Bipyrimidine

KW - Dinuclear complexes

KW - Electroluminescence

KW - Europium

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DO - 10.1002/ejic.200500438

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JO - European Journal of Inorganic Chemistry

JF - European Journal of Inorganic Chemistry

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Synthesis and characterization of dinuclear europium complexes showing pure red electroluminescence

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