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<p>SrAl<sub>2</sub>O<sub>4</sub>:Eu,Dy (SOAED) phosphor material was prepared by solution combustion method. Formation of the material in a single phase was confirmed by powder X-ray diffraction (PXRD). However, PXRD of the material annealed beyond 800&#xa0;°C shows phase separation into SrAl<sub>2</sub>O<sub>4</sub>, Sr<sub>2</sub>Al<sub>6</sub>O<sub>11</sub> and SrO phases. The mechanoluminescence (ML) characteristics of the material were optimized by codoping Eu 1.5&#xa0;mol% and varying Dy concentration from 0.5 to 2.0&#xa0;mol%. The effect of annealing shows increase in mechanoluminescence (ML) and thermoluminescence (TL) intensities up to 200&#xa0;°C but they diminish on annealing at 800&#xa0;°C in air and do not regain completely on annealing even in the reducing atmosphere again. The optimized material was crushed and sieved to obtain particles in different micron size ranges (~ 10–250&#xa0;µm). It was further ball milled for different time intervals to obtain particles in the sub-micron/nanometre ranges (~ 30–500&#xa0;nm). The particle size of the nanoparticles was determined by broadenings of XRD peaks using Scherrer’s formula. FE-SEM images also revealed shapes and sizes of these materials. PL and ML spectra were studied to identify different transitions of Eu and Dy impurities. The effect of particle size on ML and TL was studied in details. Both ML and TL intensities were found to decrease with the particle size decreasing. Regeneration of traps by UV radiation was studied for its possible application in the dosimetry. ML phosphor materials have great importance in developing stress and dosimetry sensors. SOAED material is found to be a good candidate for these applications.</p>

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Mechanoluminescence (ML) and thermoluminescence (TL) studies in SrAl2O4:Eu,Dy: effect of particle size and redox reactions

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Lucky Sharma,
  • Aditya Sahare,
  • P. D. Sahare

摘要

SrAl2O4:Eu,Dy (SOAED) phosphor material was prepared by solution combustion method. Formation of the material in a single phase was confirmed by powder X-ray diffraction (PXRD). However, PXRD of the material annealed beyond 800 °C shows phase separation into SrAl2O4, Sr2Al6O11 and SrO phases. The mechanoluminescence (ML) characteristics of the material were optimized by codoping Eu 1.5 mol% and varying Dy concentration from 0.5 to 2.0 mol%. The effect of annealing shows increase in mechanoluminescence (ML) and thermoluminescence (TL) intensities up to 200 °C but they diminish on annealing at 800 °C in air and do not regain completely on annealing even in the reducing atmosphere again. The optimized material was crushed and sieved to obtain particles in different micron size ranges (~ 10–250 µm). It was further ball milled for different time intervals to obtain particles in the sub-micron/nanometre ranges (~ 30–500 nm). The particle size of the nanoparticles was determined by broadenings of XRD peaks using Scherrer’s formula. FE-SEM images also revealed shapes and sizes of these materials. PL and ML spectra were studied to identify different transitions of Eu and Dy impurities. The effect of particle size on ML and TL was studied in details. Both ML and TL intensities were found to decrease with the particle size decreasing. Regeneration of traps by UV radiation was studied for its possible application in the dosimetry. ML phosphor materials have great importance in developing stress and dosimetry sensors. SOAED material is found to be a good candidate for these applications.