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This study synthesized Yb-doped nanophosphors with the composition M₂SiO₄:Yb (where M = Ba, Sr) using a sol-gel method. Ytterbium ions were introduced at Sr2+ sites in concentrations of 0–3% to examine how alkaline earth metal substitutions affect material properties. The BaSrSiO₄:Yb single-phase orthorhombic crystalline structure with Pbnm space group was found by structural investigation using PXRD. A near-infrared PL emission at around 975 nm was detected by optical characterisation and was ascribed to the Yb2 + 2F5/2 → 2F7/2 transition. In the doped system, the lack of spectrum overlap between these emission and absorption regions indicates insignificant energy transfer losses. Excitation with a 249 nm laser diode showed no evidence of Yb2+-related transitions, supporting the dominance of Yb3+ substitution at Sr2+ sites, likely due to charge compatibility. The lack of 5d orbital transitions in the spectra further corroborates this behavior. PL intensity decreased above 4 mol% Yb doping, establishing BaSrSiO₄ with 4 mol% Yb as the optimal formulation for optical sensing. Thermoluminescence (TL) studies of the 3 mol% Yb-doped sample exposed to UV light for 30 minutes displayed a distinct single glow peak. TL intensity with UV dosage have a linear relationship, demonstrating its use in radiation dosimetry. The calculated activation energy (~0.64 eV) indicates rapid carrier release, making this material suitable for fast-response sensor systems.

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Structural and Optical Properties of Sol-Gel Synthesized Yb3+ Doped Divalent Metal (Ba, Sr) Orthosilicates Nano Phosphors

  • 会议论文

  • 发表日期：

    2026年

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  • Rahul Pali,
  • M. Z. Khan,
  • U. K. Shrivastava,
  • R. P. Patel

摘要

This study synthesized Yb-doped nanophosphors with the composition M₂SiO₄:Yb (where M = Ba, Sr) using a sol-gel method. Ytterbium ions were introduced at Sr2+ sites in concentrations of 0–3% to examine how alkaline earth metal substitutions affect material properties. The BaSrSiO₄:Yb single-phase orthorhombic crystalline structure with Pbnm space group was found by structural investigation using PXRD. A near-infrared PL emission at around 975 nm was detected by optical characterisation and was ascribed to the Yb2 + 2F5/2 → 2F7/2 transition. In the doped system, the lack of spectrum overlap between these emission and absorption regions indicates insignificant energy transfer losses. Excitation with a 249 nm laser diode showed no evidence of Yb2+-related transitions, supporting the dominance of Yb3+ substitution at Sr2+ sites, likely due to charge compatibility. The lack of 5d orbital transitions in the spectra further corroborates this behavior. PL intensity decreased above 4 mol% Yb doping, establishing BaSrSiO₄ with 4 mol% Yb as the optimal formulation for optical sensing. Thermoluminescence (TL) studies of the 3 mol% Yb-doped sample exposed to UV light for 30 minutes displayed a distinct single glow peak. TL intensity with UV dosage have a linear relationship, demonstrating its use in radiation dosimetry. The calculated activation energy (~0.64 eV) indicates rapid carrier release, making this material suitable for fast-response sensor systems.