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<p>This study presents the synthesis of SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup> persistent luminescent phosphors using the combustion method with various fluxing agents to assess their impact on phase formation, morphology, and optical properties. XRD analysis confirmed the formation of a monoclinic crystal phase, while significant changes in surface morphology were noted based on the type of flux employed. Absorption spectroscopy (UV-Visible-IR) indicated a variation in the bandgap value due to structural change, leading to a change in defect levels. The photoluminescence study revealed flux-induced effects on excitation and emission behavior, including a red-region emission peak associated with Eu<sup>3+</sup>, suggesting partial oxidation of Eu ions during synthesis. Thermoluminescence analysis shows that flux type plays a crucial role in determining the density, depth, and distribution of trapping centers in Sr Al<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphors. To explore practical applications, the optimized phosphor was incorporated into a polydimethylsiloxane (PDMS) matrix, resulting in a flexible PDMS-phosphor composite (PSP) designed for security marking. Phosphorescent decay times of&#xa0;95&#xa0;min for LiF, 75&#xa0;min for H<sub>3</sub>BO₃, and 45&#xa0;min were observed for tetraethoxyorthosilicate (TEOS) flux samples, highlighting its potential for signage.</p>

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Engineering Persistent Luminescence in SrAl2O4:Eu2+, Dy3+ for Signage Application

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Kiran Kalkal,
  • Y. Dwivedi

摘要

This study presents the synthesis of SrAl2O4:Eu2+, Dy3+ persistent luminescent phosphors using the combustion method with various fluxing agents to assess their impact on phase formation, morphology, and optical properties. XRD analysis confirmed the formation of a monoclinic crystal phase, while significant changes in surface morphology were noted based on the type of flux employed. Absorption spectroscopy (UV-Visible-IR) indicated a variation in the bandgap value due to structural change, leading to a change in defect levels. The photoluminescence study revealed flux-induced effects on excitation and emission behavior, including a red-region emission peak associated with Eu3+, suggesting partial oxidation of Eu ions during synthesis. Thermoluminescence analysis shows that flux type plays a crucial role in determining the density, depth, and distribution of trapping centers in Sr Al2O4:Eu2+,Dy3+ phosphors. To explore practical applications, the optimized phosphor was incorporated into a polydimethylsiloxane (PDMS) matrix, resulting in a flexible PDMS-phosphor composite (PSP) designed for security marking. Phosphorescent decay times of 95 min for LiF, 75 min for H3BO₃, and 45 min were observed for tetraethoxyorthosilicate (TEOS) flux samples, highlighting its potential for signage.