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<p>This work investigates the influence of Nb<sub>2</sub>O<sub>5</sub> incorporation on the structural and luminescent properties of Eu<sup>3+</sup>–doped phosphate glasses. Raman spectroscopy revealed that the addition of Nb<sub>2</sub>O<sub>5</sub> promotes the substitution of PO<sub>4</sub> units by NbO<sub>6</sub> octahedra, leading to depolymerization of the glass network and a reduction in phonon energy. Optical absorption spectra showed a redshift in the absorption edge and a decrease in the optical band gap, associated with an increased number of nonbonding oxygens. Photoluminescence spectra exhibited an enhancement in the hypersensitive <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> transition and increases in both the relative intensity ratio (<i>R</i>) and the Judd–Ofelt parameter Ω<sub>2</sub>, indicating a rise in local asymmetry. Lifetime measurements revealed a reduction in the experimental lifetime, along with an increase in total radiative emission rate and suppression of non–radiative processes, yielding a quantum efficiency of up to 93%. These findings demonstrate that Nb<sub>2</sub>O<sub>5</sub> incorporation significantly improves the red emission efficiency of Eu<sup>3+</sup> ions in phosphate glass matrices.</p>

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Impact of Nb2O5 on the Glass Structure and Quantum Efficiency of Eu3+–doped Phosphate Glasses

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月30日

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  • Luiz Pereira da Silva Neto,
  • José Carlos Silva Filho,
  • Nilmar Silva Camilo,
  • Viviane Pilla,
  • Luana Estefhane Santos Silva,
  • Noelio Oliveira Dantas,
  • Acácio Aparecido Andrade

摘要

This work investigates the influence of Nb2O5 incorporation on the structural and luminescent properties of Eu3+–doped phosphate glasses. Raman spectroscopy revealed that the addition of Nb2O5 promotes the substitution of PO4 units by NbO6 octahedra, leading to depolymerization of the glass network and a reduction in phonon energy. Optical absorption spectra showed a redshift in the absorption edge and a decrease in the optical band gap, associated with an increased number of nonbonding oxygens. Photoluminescence spectra exhibited an enhancement in the hypersensitive 5D0 → 7F2 transition and increases in both the relative intensity ratio (R) and the Judd–Ofelt parameter Ω2, indicating a rise in local asymmetry. Lifetime measurements revealed a reduction in the experimental lifetime, along with an increase in total radiative emission rate and suppression of non–radiative processes, yielding a quantum efficiency of up to 93%. These findings demonstrate that Nb2O5 incorporation significantly improves the red emission efficiency of Eu3+ ions in phosphate glass matrices.