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<p>A new series of Pr³⁺-doped phosphate glasses with the composition (5–x)P₂O₅:40Li₂O:55B₂O₃: xPr₂O₃ (x = 0, 0.3, 0.5, 0.7&#xa0;mol%) was synthesized by the conventional melt-quenching technique. A broad X-ray diffraction hump confirms the amorphous nature of the prepared glass samples. Optical absorption and fluorescence spectra were recorded at room temperature. The Judd-Ofelt theory was applied to compute radiative transition probabilities, branching ratios, and radiative lifetimes. The Judd-Ofelt parameters (Ω₂, Ω₄, Ω₆) were determined to investigate the bonding environment around Pr<sup>3+</sup> ions. The electrostatic interaction parameters (F₂, F₄, F₆) and spin–orbit coupling constant (ζ<sub>4f</sub>) were also derived from the absorption spectra. Raman spectroscopy offered detailed information on the vibrational modes and structural modifications within the glass system. The optical bandgap and Urbach energy were evaluated using Tauc’s method. The variation in Urbach energy reflects the degree of structural disorder in the glass matrix. The relatively low value of Urbach energy (2.53&#xa0;eV) for the PLB0.3Pr glass indicates good transparency, making it a promising candidate for optical filter applications.</p>

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Optical bandgap and Judd-Ofelt analysis of Pr3+ doped lithium borate phosphate glasses

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Menka Meena,
  • S. S. Meena,
  • Pawan Kumar,
  • Nitiksha sharma,
  • Beena Bhatia

摘要

A new series of Pr³⁺-doped phosphate glasses with the composition (5–x)P₂O₅:40Li₂O:55B₂O₃: xPr₂O₃ (x = 0, 0.3, 0.5, 0.7 mol%) was synthesized by the conventional melt-quenching technique. A broad X-ray diffraction hump confirms the amorphous nature of the prepared glass samples. Optical absorption and fluorescence spectra were recorded at room temperature. The Judd-Ofelt theory was applied to compute radiative transition probabilities, branching ratios, and radiative lifetimes. The Judd-Ofelt parameters (Ω₂, Ω₄, Ω₆) were determined to investigate the bonding environment around Pr3+ ions. The electrostatic interaction parameters (F₂, F₄, F₆) and spin–orbit coupling constant (ζ4f) were also derived from the absorption spectra. Raman spectroscopy offered detailed information on the vibrational modes and structural modifications within the glass system. The optical bandgap and Urbach energy were evaluated using Tauc’s method. The variation in Urbach energy reflects the degree of structural disorder in the glass matrix. The relatively low value of Urbach energy (2.53 eV) for the PLB0.3Pr glass indicates good transparency, making it a promising candidate for optical filter applications.