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<p>We demonstrate a nanocrystalline ZnO phosphor synthesized via a low-temperature co-precipitation route that exhibits enhanced thermoluminescence (TL) and optically stimulated luminescence (OSL) characteristics suitable for high-dose radiation dosimetry. Structural analyses confirm phase-pure wurtzite ZnO with nanoscale crystallinity and preserved chemical integrity. The TL glow curve reveals a multi-trap structure, and deconvolution identifies four distinct trapping centers spanning shallow-to-deep energy levels, enabling efficient charge storage and thermal stability. Kinetic evaluation highlights trap parameters favorable for dosimetric retention. Continuous-wave OSL decay shows bi-exponential behavior, confirming the contribution of multiple trap populations with high photoionization efficiency. The corresponding photoionization cross sections were determined to be 3.25 × 10⁻<sup>18</sup> cm<sup>2</sup> and 5.59 × 10⁻<sup>19</sup> cm<sup>2</sup>, respectively, which signifies efficient optical stimulation and charge release. Importantly, the OSL dose–response remains linear up to 1&#xa0;kGy, indicating excellent high-dose performance. The coexistence of thermally stable deep traps and optically active recombination centers represents a key advancement, positioning the synthesized ZnO nanophosphor as a promising candidate for reusable, high-dose OSL dosimeters.</p>

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Synthesis and characterization of ZnO nanophosphors for optically stimulated luminescence-based radiation dosimetry

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Anuj Soni,
  • Vishakha Kaushik,
  • G. S. Polymeris,
  • S. Samanta,
  • S. Bhattacharya,
  • Sachin Pathak,
  • D. R. Mishra,
  • B. K. Sapra

摘要

We demonstrate a nanocrystalline ZnO phosphor synthesized via a low-temperature co-precipitation route that exhibits enhanced thermoluminescence (TL) and optically stimulated luminescence (OSL) characteristics suitable for high-dose radiation dosimetry. Structural analyses confirm phase-pure wurtzite ZnO with nanoscale crystallinity and preserved chemical integrity. The TL glow curve reveals a multi-trap structure, and deconvolution identifies four distinct trapping centers spanning shallow-to-deep energy levels, enabling efficient charge storage and thermal stability. Kinetic evaluation highlights trap parameters favorable for dosimetric retention. Continuous-wave OSL decay shows bi-exponential behavior, confirming the contribution of multiple trap populations with high photoionization efficiency. The corresponding photoionization cross sections were determined to be 3.25 × 10⁻18 cm2 and 5.59 × 10⁻19 cm2, respectively, which signifies efficient optical stimulation and charge release. Importantly, the OSL dose–response remains linear up to 1 kGy, indicating excellent high-dose performance. The coexistence of thermally stable deep traps and optically active recombination centers represents a key advancement, positioning the synthesized ZnO nanophosphor as a promising candidate for reusable, high-dose OSL dosimeters.