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<p>Li₂Sr₂Al₂PO₄F₉ phosphors doped with Eu<sup>3</sup>⁺ ions were successfully synthesized using the combustion technique, employing urea as the fuel. The phase purity and crystalline structure of the synthesized phosphors were confirmed through X-ray diffraction (XRD) analysis. In PL emission-spectrum of the ion Eu<sup>3+</sup> doped Li<sub>2</sub>Sr<sub>2</sub>Al<sub>2</sub>PO<sub>4</sub>F<sub>9</sub> with 393&#xa0;nm excitation gave two intense peaks at 593 (characteristics orange emission) and 618&#xa0;nm (characteristics red emission) due to fluorescent transitions of <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub> and <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub>, dipole–dipole interaction. Thermoluminescence (TL) measurements of γ-irradiated Eu<sup>3</sup>⁺-doped samples displayed a well-defined glow peak, with its position remaining invariant across varying Eu<sup>3</sup>⁺ concentrations. The change in concentration of the dopant Eu has no effect on peak shape and the peak position. But, as the concentration is increased the TL intensity increases &amp; TL intensity maximum is observed for an concentration of the 1&#xa0;mol%. However, TL intensity of rare earth Eu doped with prepared phosphor is not comparable to that of dosimetric peak of CaSO<sub>4</sub>: Dy. In this research, the trapping parameters were evaluated using Chen’s peak shape method, yielding activation energies of 0.733, 0.814, and 0.774&#xa0;eV, with an average activation energy of 0.774&#xa0;eV. The corresponding frequency factor was estimated to be 4.29 × 10⁶ s⁻<sup>1</sup>, indicating stable trap centers.</p>

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Investigation of trapping parameters in Eu3⁺ doped Li₂Sr₂Al₂PO₄F₉ phosphor for enhanced optical performance

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • S. A. Fartode,
  • Anoop P. Fartode,
  • Sonal P.Tatte,
  • Tushar R. Shelke,
  • S. J. Dhoble

摘要

Li₂Sr₂Al₂PO₄F₉ phosphors doped with Eu3⁺ ions were successfully synthesized using the combustion technique, employing urea as the fuel. The phase purity and crystalline structure of the synthesized phosphors were confirmed through X-ray diffraction (XRD) analysis. In PL emission-spectrum of the ion Eu3+ doped Li2Sr2Al2PO4F9 with 393 nm excitation gave two intense peaks at 593 (characteristics orange emission) and 618 nm (characteristics red emission) due to fluorescent transitions of 5D0 → 7F1 and 5D0 → 7F2, dipole–dipole interaction. Thermoluminescence (TL) measurements of γ-irradiated Eu3⁺-doped samples displayed a well-defined glow peak, with its position remaining invariant across varying Eu3⁺ concentrations. The change in concentration of the dopant Eu has no effect on peak shape and the peak position. But, as the concentration is increased the TL intensity increases & TL intensity maximum is observed for an concentration of the 1 mol%. However, TL intensity of rare earth Eu doped with prepared phosphor is not comparable to that of dosimetric peak of CaSO4: Dy. In this research, the trapping parameters were evaluated using Chen’s peak shape method, yielding activation energies of 0.733, 0.814, and 0.774 eV, with an average activation energy of 0.774 eV. The corresponding frequency factor was estimated to be 4.29 × 10⁶ s⁻1, indicating stable trap centers.