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Enhanced optoelectronics properties of europium(III) complexes with β-diketone and nitrogen heterocyclic ligands

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Abstract

Preparation and photoluminescence behavior of six new europium complexes with β-diketone 1-(2-hydroxy phenyl)-3-phenylpropane-1,3-dione (HPPP) and bathophenanthroline (batho), 2,2′-bipyridyl (bipy), 2,2′-biquinoline (biq), neocuproin (neo) and 1,10-phenanthroline (phen) are reported in solid state. The ligand (HPPP) and complexes Eu(HPPP)3·H2O (1), Eu(HPPP)3·phen (2), Eu(HPPP)3·batho (3), Eu(HPPP)3·bipy (4), Eu(HPPP)3·biq (5) and Eu(HPPP)3·neo (6) were characterized by means of elemental analysis, infrared spectroscopy, proton nuclear magnetic resonance (1H-NMR). The optical properties, thermal stability and crystalline nature were investigated by photoluminescence spectroscopy, thermogravimetric analysis and XRD respectively. The emission spectra show narrow intense emission band of central europium (III) metal ion that arise from the high intense 5D0 → 7F0 transition. The introduction of ancillary ligands like batho, bipy, biq, neo, phen enlarged the π-conjugation system in complexes as a result higher luminescence intensity, longer life time (τ) and higher quantum efficiency (η) observed in europium ternary complexes in comparison to Eu(HPPP)3·H2O (1). Based on the emission spectra, the luminescence decay curve was measured which indicated that the transfer of energy from HPPP ligand to the europium metal is more efficient in complexes 2–6 than complex 1.

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Acknowledgments

The financial support for this work from Council of Scientific and Industrial Research (CSIR) of India (09/382 (0155)/2012-EMR-I) is highly acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, Haryana, India

    Manju Bala, Satish Kumar, Priti Boora, V. B. Taxak, Avni Khatkar & S. P. Khatkar

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  1. Manju Bala
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  2. Satish Kumar
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  3. Priti Boora
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  4. V. B. Taxak
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Correspondence to S. P. Khatkar.

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Bala, M., Kumar, S., Boora, P. et al. Enhanced optoelectronics properties of europium(III) complexes with β-diketone and nitrogen heterocyclic ligands. J Mater Sci: Mater Electron 25, 2850–2856 (2014). https://doi.org/10.1007/s10854-014-1951-x

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  • DOI: https://doi.org/10.1007/s10854-014-1951-x

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