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<p>Four mononuclear europium(III) complexes, [Eu(BBA)<sub>3</sub>(Bpy)] (E1), [Eu(BBA)<sub>3</sub>(Phen)] (E2), [Eu(BBA)<sub>3</sub>(DBrphen)] (E3) and [Eu(BBA)<sub>3</sub>(Dmphen)] (E4) [BBA (1-(4-Bromophenyl)butane-1,3-dione); Bpy (2,2′-Bipyridine); Phen (1,10-Phenanthroline); DBrphen (2,9-Dibromo-1,10-phenanthroline) and Dmphen (2,9-Dimethyl-1,10-phenanthroline)] were synthesized and characterized through structural and spectroscopic methodologies, including DFT calculations. In-depth photophysical investigations, encompassing UV-Vis absorption, emission spectra, luminescence decay kinetics and quantum yield were conducted to elucidate their inherent luminescent properties. Photoluminescence studies revealed intense red emission, predominantly arising from the electric dipole transition (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub>), confirming the asymmetric coordination environment around the Eu<sup>3+</sup> ion. Judd-Ofelt analysis highlighted strong sensitization effect of the Ligands, facilitating efficient energy transfer to the metal center. Notably, the efficient energy migration process from the chosen chromophores to the metal ion is further supported by the lack of Ligand-centered emission between 400 and 550&#xa0;nm. The resulting CIE color coordinates closely align with the EBU and SMPTE red standard, highlighting their application in optoelectronic devices.</p> Graphical Abstract <p></p>

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Brominated β-diketone-driven luminescence in europium(III) complexes: insights from spectroscopic, DFT and Judd-Ofelt analysis

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Sofia Malik,
  • Komal Jakhar,
  • Devender Singh,
  • Pawan Kumar,
  • Sumit Kumar,
  • Rajender Singh Malik,
  • Parvin Kumar

摘要

Four mononuclear europium(III) complexes, [Eu(BBA)3(Bpy)] (E1), [Eu(BBA)3(Phen)] (E2), [Eu(BBA)3(DBrphen)] (E3) and [Eu(BBA)3(Dmphen)] (E4) [BBA (1-(4-Bromophenyl)butane-1,3-dione); Bpy (2,2′-Bipyridine); Phen (1,10-Phenanthroline); DBrphen (2,9-Dibromo-1,10-phenanthroline) and Dmphen (2,9-Dimethyl-1,10-phenanthroline)] were synthesized and characterized through structural and spectroscopic methodologies, including DFT calculations. In-depth photophysical investigations, encompassing UV-Vis absorption, emission spectra, luminescence decay kinetics and quantum yield were conducted to elucidate their inherent luminescent properties. Photoluminescence studies revealed intense red emission, predominantly arising from the electric dipole transition (5D0 → 7F2), confirming the asymmetric coordination environment around the Eu3+ ion. Judd-Ofelt analysis highlighted strong sensitization effect of the Ligands, facilitating efficient energy transfer to the metal center. Notably, the efficient energy migration process from the chosen chromophores to the metal ion is further supported by the lack of Ligand-centered emission between 400 and 550 nm. The resulting CIE color coordinates closely align with the EBU and SMPTE red standard, highlighting their application in optoelectronic devices.

Graphical Abstract