• Luminescence properties of terbium-doped Li$_3$PO$_4$ phosphor for radiation dosimetry

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      https://www.ias.ac.in/article/fulltext/boms/039/07/1619-1623

    • Keywords

       

      Li$_3$PO$_4$:Tb$^{3+}$; OSL; radiation dosimetry; TLD-500.

    • Abstract

       

      A polycrystalline sample of Li$_3$PO$_4$:Tb$^{3+}$ phosphor was successfully synthesized using solid-state diffusion method. This synthesis method is of low cost, low temperature and does not require any other atmospheres for the synthesis. The powder X-ray diffraction (PXRD), photoluminescence (PL) emission and excitation spectra, thermoluminescence (TL) and optically stimulated luminescence (OSL) were measured. The particle size was calculated using the Debye Scherrer formula and found to be 79.42 nm. PL emission spectra of Li$_3$PO$_4$:Tb$^{3+}$ phosphor show the strong prominent peak at 544 nm corresponding to ${}^{5}$D$_4$ to ${}^{7}$F$_5$ transitions of Tb$^{3+}$. The OSL sensitivity of prepared Li$_3$PO$_4$:Tb$^{3+}$ phosphor was 50% of that of $\alpha$-Al$_2$O$_3$:C. Its decay curve consists of three components withphotoionization cross-sections $0.44\times 10^{−17}$, $3.09\times 10^{−17}$ and $23\times 10^{−17}$ cm$^{2}$. The TL glow curve of the prepared sampleconsists of two characteristic peaks, which were deconvoluted using the peak fit software, and kinetic parameters were determined using the peak shape method. TL intensity was compared with that of the commercially availableTLD-500 phosphor. OSL dose response was linear in the measured range and the minimum detectable dose (MDD) was found to be 67.42 $\mu$Gy, while fading of the OSL signal was found to be about 27% in 4200 min after which theOSL signal stabilizes.

    • Author Affiliations

       

      C B PALAN1 N S BAJAJ2 S K OMANWAR1

      1. Department of Physics, Sant Gadge Baba Amravati University, Amravati 444602, India
      2. Toshniwal ACS College, Sengaon, Hingoli 431602, India
    • Dates

       
  • Bulletin of Materials Science | News

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      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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