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<p>This study focuses on the synthesis of five vermilion red-light-emitting europium complexes featuring β-ketocarboxylic acid as the primary ligand and heterocyclic ring compound as ancillary ligands to investigate their potential use in display, optoelectronic devices, and fingerprint. The coordinating behavior of the complexes was determined using various analytical techniques, including elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX) analyses, proton nuclear magnetic resonance (<sup>1</sup>H-NMR), carbon-13 nuclear magnetic resonance (<sup>13</sup>C-NMR) and Fourier-transform infrared spectroscopy (FTIR), which confirmed the bonding of the ligand and ancillary ligands with the Eu<sup>3+</sup> ions and revealed the crystalline and pure nature of synthesized complexes. Thermal gravimetric analysis (TGA) and differential thermal analysis (DTA) indicated that these complexes exhibit thermal stability up to 232&#xa0;°C, making them suitable for optical device applications. The complexes were extensively characterized by an in-depth examination of their photophysical properties in solid and solution phase, including detailed studies of their photoluminescence behavior, color parameters, Judd–Ofelt analyses, and bandgap determination. The outcome indicates that complexes exhibit vermilion red emission under ultraviolet (UV) excitation, with the <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> transition being the main emissive transition. CIE color coordinates confirmed the red emission. The theoretical band gap values are 2.0865–3.3598&#xa0;eV, and computational values are 2.092–3.353&#xa0;eV, revealing the semiconducting behavior of the complexes. Theoretical and computational results for the band gap match well with each other. Judd–Ofelt analyses provided insights into the asymmetric chemical environment around the Eu(III) ion and the degree of covalence in the complexes. These excellent results indicate that the synthesized complexes are suitable for use in unique fingerprinting, semiconductors, and other photophysical applications.</p> Graphical Abstract <p></p>

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Spectroscopic characteristics of vermilion red light emitting Eu(III) organic complexes for laser, optoelectronic and latent fingerprint application

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Shagun Goyat,
  • Vaishnavi Lather,
  • Bhawna Rathee,
  • Rajesh Kumar

摘要

This study focuses on the synthesis of five vermilion red-light-emitting europium complexes featuring β-ketocarboxylic acid as the primary ligand and heterocyclic ring compound as ancillary ligands to investigate their potential use in display, optoelectronic devices, and fingerprint. The coordinating behavior of the complexes was determined using various analytical techniques, including elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX) analyses, proton nuclear magnetic resonance (1H-NMR), carbon-13 nuclear magnetic resonance (13C-NMR) and Fourier-transform infrared spectroscopy (FTIR), which confirmed the bonding of the ligand and ancillary ligands with the Eu3+ ions and revealed the crystalline and pure nature of synthesized complexes. Thermal gravimetric analysis (TGA) and differential thermal analysis (DTA) indicated that these complexes exhibit thermal stability up to 232 °C, making them suitable for optical device applications. The complexes were extensively characterized by an in-depth examination of their photophysical properties in solid and solution phase, including detailed studies of their photoluminescence behavior, color parameters, Judd–Ofelt analyses, and bandgap determination. The outcome indicates that complexes exhibit vermilion red emission under ultraviolet (UV) excitation, with the 5D0 → 7F2 transition being the main emissive transition. CIE color coordinates confirmed the red emission. The theoretical band gap values are 2.0865–3.3598 eV, and computational values are 2.092–3.353 eV, revealing the semiconducting behavior of the complexes. Theoretical and computational results for the band gap match well with each other. Judd–Ofelt analyses provided insights into the asymmetric chemical environment around the Eu(III) ion and the degree of covalence in the complexes. These excellent results indicate that the synthesized complexes are suitable for use in unique fingerprinting, semiconductors, and other photophysical applications.

Graphical Abstract