Thermoluminescence in Eu doped NaLi2PO4TLD nanophosphor: Effect of particle size on TL characteristics
| Autor: | Rajesh Kumar, Nandkumar T. Mandlik, P.D. Sahare, Martina Saran, Vishnu Chauhan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Band gap Scanning electron microscope Biophysics Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Thermoluminescence Atomic and Molecular Physics and Optics 0104 chemical sciences Field electron emission Impurity Particle size 0210 nano-technology Luminescence Powder diffraction |
| Zdroj: | Journal of Luminescence. 238:118207 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2021.118207 |
| Popis: | We report the thermoluminescence of Eu-doped NaLi2PO4 synthesized by solid state diffusion method. Formation of the material was confirmed by powder X-ray diffraction (PXRD) technique. Broadening of the PXRD peaks and field emission scanning microscope (FESEM) images were used for determining its particle size(s). Thermoluminescence (TL) characteristics were studied to see the effect of particle size after irradiating with γ -rays from 60Co source for wide-range (10 Gy-100 kGy) of doses. It was observed that not only TL sensitivity but also glow curve structure depends on particle size of the material. Glow curves were further deconvoluted using computerized glow curve deconvolution (CGCD) technique (after confirming the number of peaks using Tm-Tstop method) to study trapping parameters. TL glow curves mainly consist of four peaks appearing in the temperature ranges of 378–385, 426–435, 447–458 and 497–506 K. The shifts in the TL glow peak temperatures and the changes in glow curve structures can be attributed to the reorganization of local impurity levels (electron traps/luminescence centers) on widening of the band gap with reducing particle size. There can also be the effect of stress on glow curves developed due to crushing. Widening of the dose response with reducing particle size, easy method of synthesis, high sensitivity, low fading, good chemical stability, etc. make this TLD nanophosphor a good candidate for radiation dosimetry using TL. |
| Databáze: | OpenAIRE |
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