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<p>Pure and europium-doped calcium dialuminate (CaAl<sub>4</sub>O<sub>7</sub>: Eu) phosphors were synthesized by microwave-assisted combustion synthesis and their thermoluminescence (TL) response against gamma-ray exposure was investigated. Powder x-ray diffraction (XRD) patterns recorded for both pure and europium-doped CaAl<sub>4</sub>O<sub>7</sub> phosphors confirm the exhibition of the monoclinic phase in both compounds. Photoluminescence investigations on the Eu-doped calcium dialuminate samples shows significant emissions at 611&#xa0;nm with excitation at 393&#xa0;nm. From the photoluminescence (PL) emission spectra, using the Judd–Ofelt analysis, intensity parameters and radiative transition parameters were calculated. TL glow curves of both Eu-doped and undoped calcium dialuminate phosphors were recorded in the range of 0.1–5&#xa0;kGy with gamma-ray irradiation to assess their suitability in high-range dose applications. Trap parameters were calculated using a computerized glow curve deconvolution method. The undoped phosphor demonstrates a good linearity over 0.1–2&#xa0;kGy dose range and a minimum detectable dose (MDD) of 0.505&#xa0;Gy. The TL signal dropped by 48% after 1&#xa0;month of storage for the pure calcium dialuminate sample, whereas the CaAl<sub>4</sub>O<sub>7</sub>:Eu phosphor shows linearity over 0.1–1&#xa0;kGy and an MDD of 3.60&#xa0;Gy. The TL signal faded by 33% after 1&#xa0;month of storage. The present study confirms that both pure and Eu-doped CaAl<sub>4</sub>O<sub>7</sub> materials are promising candidates for the applications in food preservation.</p>

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Study of Photoluminescence Characteristics Through Judd–Ofelt Theory and Thermoluminescence Properties of CaAl4O7: Eu Phosphors Synthesized Via Microwave-Assisted Combustion Method for High-Dose Gamma Application

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Mahesha Hegde,
  • Rajashree Panda,
  • Mitrabhanu Behera,
  • I. Yashodhara,
  • N. Karunakara,
  • R. Arun Kumar

摘要

Pure and europium-doped calcium dialuminate (CaAl4O7: Eu) phosphors were synthesized by microwave-assisted combustion synthesis and their thermoluminescence (TL) response against gamma-ray exposure was investigated. Powder x-ray diffraction (XRD) patterns recorded for both pure and europium-doped CaAl4O7 phosphors confirm the exhibition of the monoclinic phase in both compounds. Photoluminescence investigations on the Eu-doped calcium dialuminate samples shows significant emissions at 611 nm with excitation at 393 nm. From the photoluminescence (PL) emission spectra, using the Judd–Ofelt analysis, intensity parameters and radiative transition parameters were calculated. TL glow curves of both Eu-doped and undoped calcium dialuminate phosphors were recorded in the range of 0.1–5 kGy with gamma-ray irradiation to assess their suitability in high-range dose applications. Trap parameters were calculated using a computerized glow curve deconvolution method. The undoped phosphor demonstrates a good linearity over 0.1–2 kGy dose range and a minimum detectable dose (MDD) of 0.505 Gy. The TL signal dropped by 48% after 1 month of storage for the pure calcium dialuminate sample, whereas the CaAl4O7:Eu phosphor shows linearity over 0.1–1 kGy and an MDD of 3.60 Gy. The TL signal faded by 33% after 1 month of storage. The present study confirms that both pure and Eu-doped CaAl4O7 materials are promising candidates for the applications in food preservation.