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<p>Sm<sub>2</sub>O<sub>3</sub>-doped lithium fluoro lanthanum oxy lead borate glasses with nominal compositions (30 − <i>x</i>)LiF–10La<sub>2</sub>O<sub>3</sub>–10PbO–50B<sub>2</sub>O<sub>3</sub>:<i>x</i>Sm<sub>2</sub>O<sub>3</sub> (<i>x</i> = 0.01–0.20&#xa0;mol.%) were synthesized via the melt-quenching method to explore their structural integrity, luminescence response, and gamma-ray shielding competence. The amorphous nature and homogeneous morphology of the glasses were validated through x-ray diffraction and scanning electron microscopy. Differential thermal analysis revealed a gradual increase in thermal stability with Sm<sub>2</sub>O<sub>3</sub> content, suggesting a more interconnected network. Mechanical properties derived from ultrasonic measurements indicated enhanced rigidity at moderate doping levels. Optical characterization confirmed the presence of Sm<sup>3+</sup>-induced absorption bands and a narrowing of the optical bandgap, attributed to changes in bonding configurations and the formation of non-bridging oxygen sites. Under ultraviolet excitation, intense reddish-orange emissions corresponding to <sup>4</sup>G<sub>5/2</sub> → ⁶H<sub>7/2</sub> and <sup>4</sup>G<sub>5/2</sub> → <sup>6</sup>H<sub>9/2</sub> transitions were observed, with emission intensity showing a doping-dependent variation due to energy transfer and concentration quenching effects. Radiation shielding parameters, including mass attenuation coefficients and half-value layers, improved with increasing Sm<sub>2</sub>O<sub>3</sub> concentration, supported by the high-Z constituents in the glass matrix. The multifunctional behavior of these glasses—including spectroscopic brightness, structural resilience, and radiation attenuation—highlights their suitability for deployment in optoelectronic devices, color display technologies, and protective systems in high-radiation environments.</p>

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Spectral and Structural Tailoring of Sm2O3-Doped LiF-La2O3-PbO-B2O3 Glasses for Advanced Luminescent Devices

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Jyothi Budida,
  • Ch. Srinivasa Rao,
  • N. Ramakrishna Chand,
  • Ravi Kumar Guntu

摘要

Sm2O3-doped lithium fluoro lanthanum oxy lead borate glasses with nominal compositions (30 − x)LiF–10La2O3–10PbO–50B2O3:xSm2O3 (x = 0.01–0.20 mol.%) were synthesized via the melt-quenching method to explore their structural integrity, luminescence response, and gamma-ray shielding competence. The amorphous nature and homogeneous morphology of the glasses were validated through x-ray diffraction and scanning electron microscopy. Differential thermal analysis revealed a gradual increase in thermal stability with Sm2O3 content, suggesting a more interconnected network. Mechanical properties derived from ultrasonic measurements indicated enhanced rigidity at moderate doping levels. Optical characterization confirmed the presence of Sm3+-induced absorption bands and a narrowing of the optical bandgap, attributed to changes in bonding configurations and the formation of non-bridging oxygen sites. Under ultraviolet excitation, intense reddish-orange emissions corresponding to 4G5/2 → ⁶H7/2 and 4G5/2 → 6H9/2 transitions were observed, with emission intensity showing a doping-dependent variation due to energy transfer and concentration quenching effects. Radiation shielding parameters, including mass attenuation coefficients and half-value layers, improved with increasing Sm2O3 concentration, supported by the high-Z constituents in the glass matrix. The multifunctional behavior of these glasses—including spectroscopic brightness, structural resilience, and radiation attenuation—highlights their suitability for deployment in optoelectronic devices, color display technologies, and protective systems in high-radiation environments.