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<p>A glass series of (45-<i>x</i>) Na<sub>2</sub>O-55SiO<sub>2</sub>-<i>x</i>Er<sub>2</sub>O<sub>3</sub>, with <i>x</i> ranging from zero to 10&#xa0;mol%, was produced via the melt-quenching technique. The study was focused on the modification in the glass structure to improve the optical and spectroscopic characteristics. Non-bridging oxygens (NBOs) are created within the SiO<sub>4</sub> tetrahedra, with the predominant <i>f</i><sub><i>1</i></sub> and <i>f</i><sub><i>2</i></sub> modes. The incorporation of 2% Er<sub>2</sub>O<sub>3</sub> into the network elevated <i>f</i><sub><i>1</i></sub> fraction from 0.46 to 0.68, which subsequently decreased with an increase in Er<sup>3+</sup> ions to 0.5. The glass density (<i>D</i>) of the base sample was 2.478&#xa0;g/cm<sup>3</sup>, which increased to 3.433&#xa0;g/cm<sup>3</sup> with the addition of Er<sub>2</sub>O<sub>3</sub>. The molar volume (<i>V</i><sub><i>m</i></sub>) values increased from 24.951 to 27.203 cm<sup>3</sup>/mol, depending on the ratio of Er<sup>3+</sup> ions. The optical band gap (<i>E</i><sub><i>g</i></sub>) values dropped from 3.168&#xa0;eV to 2.183&#xa0;eV as the Er<sub>2</sub>O<sub>3</sub> concentration rose from zero to 10&#xa0;mol%, while the refractive index (<i>n</i><sub><i>o</i></sub>) increased from 2.353 to 2.661. The spectroscopic properties were analyzed utilizing Judd–Ofelt theory. The intensity parameters (Ω<sub>λ</sub>) exhibit the order Ω<sub>2</sub> &gt; Ω<sub>4</sub> &gt; Ω<sub>6</sub> for all samples containing Er<sup>3+</sup> ions, due to the high covalent character of the glass. Moreover, the Ω<sub>λ</sub> is dependent on the concentration of Er<sub>2</sub>O<sub>3</sub>; Ω<sub>2</sub> decreased from 1.159 to 0.373, Ω<sub>4</sub> decreased from 0.851 to 0.247, and Ω<sub>6</sub> varied from 0.501 to 0.209, as the Er<sub>2</sub>O<sub>3</sub> concentration increased from 2 to 10&#xa0;mol%. The computed radiative lifetime rose from 85.027 to 146.177&#xa0;µs, rendering these glasses appropriate for use as a laser active medium.</p>

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Structural, Spectroscopic, and Optical Properties of Na2O–SiO2 Glass Network Doped with Er2O3

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • G. O. Rabie

摘要

A glass series of (45-x) Na2O-55SiO2-xEr2O3, with x ranging from zero to 10 mol%, was produced via the melt-quenching technique. The study was focused on the modification in the glass structure to improve the optical and spectroscopic characteristics. Non-bridging oxygens (NBOs) are created within the SiO4 tetrahedra, with the predominant f1 and f2 modes. The incorporation of 2% Er2O3 into the network elevated f1 fraction from 0.46 to 0.68, which subsequently decreased with an increase in Er3+ ions to 0.5. The glass density (D) of the base sample was 2.478 g/cm3, which increased to 3.433 g/cm3 with the addition of Er2O3. The molar volume (Vm) values increased from 24.951 to 27.203 cm3/mol, depending on the ratio of Er3+ ions. The optical band gap (Eg) values dropped from 3.168 eV to 2.183 eV as the Er2O3 concentration rose from zero to 10 mol%, while the refractive index (no) increased from 2.353 to 2.661. The spectroscopic properties were analyzed utilizing Judd–Ofelt theory. The intensity parameters (Ωλ) exhibit the order Ω2 > Ω4 > Ω6 for all samples containing Er3+ ions, due to the high covalent character of the glass. Moreover, the Ωλ is dependent on the concentration of Er2O3; Ω2 decreased from 1.159 to 0.373, Ω4 decreased from 0.851 to 0.247, and Ω6 varied from 0.501 to 0.209, as the Er2O3 concentration increased from 2 to 10 mol%. The computed radiative lifetime rose from 85.027 to 146.177 µs, rendering these glasses appropriate for use as a laser active medium.