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<p>This study presents a methodology for synthesizing a mononuclear europium (III) complex with two carboxylate groups and a phenanthroline ligand. The synthesis process involves the formation of a solvent-free and anion-free precipitate within the coordination sphere. The simulation of structure from X-ray powder was performed with EXPO2013 software, morphological, FTIR (Infrared Rays) analyses and luminescent properties of the complex were presented. Compared to previous studies on europium(III) complexes with benzoic acid, our research reveals that the newly synthesized complex, [Eu(OOCC<sub>6</sub>H<sub>5</sub>)<sub>3</sub>·C<sub>12</sub>H<sub>8</sub>N<sub>2</sub>], exhibits enhanced luminescence from the Eu<sup>3+</sup> emission transitions (<sup>5</sup>D₀ to <sup>7</sup>F<sub>0,1,2</sub>) centered at 576, 596, and 607&#xa0;nm, with a high red color purity of 0.95, chromatic coordinates (0.64, 0.34) of this new complex are close to the standard coordinates (0.67, 0.33) for the red phosphor of the <i>National Television System Committee</i> when is excited into π-π* transition band at 347&#xa0;nm. This excitation wavelength aligns well with the dominant emission from InAlGaN near UV-LEDs, in contrast to its precursor, whose π-π* excitation band is presented at 280&#xa0;nm (higher energy) and exhibits a color purity of 0.86. The <sup>5</sup>D₀ → ⁷F₂ fluorescence decay was measured, confirming its exponential nature with a time constant of 1.37&#xa0;ms at 300&#xa0;K and its calculated emission quantum yield was 0.88. Despite the structural asymmetry and the elimination of water in its structure, as confirmed by FTIR analyses, the new complex demonstrates superior luminescent properties.</p>

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Easy solvent free and anion free obtention of europium mononuclear complex with enhanced red luminescence

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Carlos Hernández-Fuentes,
  • Ángel de Jesús Morales-Ramírez,
  • Friné López-Medina,
  • Fernando Perez-Villaseñor,
  • Arturo Elias-Dominguez,
  • Héctor J. Dorantes-Rosales,
  • Dulce Y. Medina-Velazquez,
  • Ulises Caldiño

摘要

This study presents a methodology for synthesizing a mononuclear europium (III) complex with two carboxylate groups and a phenanthroline ligand. The synthesis process involves the formation of a solvent-free and anion-free precipitate within the coordination sphere. The simulation of structure from X-ray powder was performed with EXPO2013 software, morphological, FTIR (Infrared Rays) analyses and luminescent properties of the complex were presented. Compared to previous studies on europium(III) complexes with benzoic acid, our research reveals that the newly synthesized complex, [Eu(OOCC6H5)3·C12H8N2], exhibits enhanced luminescence from the Eu3+ emission transitions (5D₀ to 7F0,1,2) centered at 576, 596, and 607 nm, with a high red color purity of 0.95, chromatic coordinates (0.64, 0.34) of this new complex are close to the standard coordinates (0.67, 0.33) for the red phosphor of the National Television System Committee when is excited into π-π* transition band at 347 nm. This excitation wavelength aligns well with the dominant emission from InAlGaN near UV-LEDs, in contrast to its precursor, whose π-π* excitation band is presented at 280 nm (higher energy) and exhibits a color purity of 0.86. The 5D₀ → ⁷F₂ fluorescence decay was measured, confirming its exponential nature with a time constant of 1.37 ms at 300 K and its calculated emission quantum yield was 0.88. Despite the structural asymmetry and the elimination of water in its structure, as confirmed by FTIR analyses, the new complex demonstrates superior luminescent properties.