Evaluation of trapping parameters of γ‐rays irradiated Dy3+‐doped LaPO4 phosphors |
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Authors: | D. M. Pimpalshende S. J. Dhoble |
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Affiliation: | 1. Department of Physics, Dr. Ambedkar College, Chandrapur, India;2. Department of Physics, R. T. M. Nagpur University, Nagpur, India |
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Abstract: | Thermoluminescence (TL) materials are widely used in radiation measurements. The best‐known applications of TL materials are in the dosimetry of ionizing radiation, and in CTV screen phosphors, scintillators, X‐ray laser materials, etc. The TL glow curve and its kinetic parameters for annealed LaPO4 at different constant temperatures and for Dy3+‐doped LaPO4 phosphors irradiated by gamma‐rays are reported here. The samples were irradiated using a 60Co gamma‐ray source at a dose of 10 Gy and the heating rate used for TL measurements was 5ºC/s. The samples were characterized using X‐ray diffraction (XRD), Fourier transform infrared, transmission electron microscopy and TL techniques. The XRD pattern shows that the prepared phosphor has a good crystalline structure with an average crystallite size of ~ 18 nm. The samples show good TL peaks for 0.05, 0.1 and 0.2 mole % doping concentrations of Dy3+ ions and anneal above 400ºC. The TL glow curve characteristics of annealed LaPO4 and Dy3+‐doped LaPO4 were analyzed and trapping parameters calculated using various methods. All TL glow curves obey the second‐order kinetics with a single glow peak, which reveals that only one set of trapping parameter is set for a particular temperature. The TL sensitivity was found to depend upon the annealing temperature and Dy3+ doping concentration. The prepared sample may be a new nano phosphor and be useful in TL dosimetry. Copyright © 2014 John Wiley & Sons, Ltd. |
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Keywords: | XRD TL TEM annealing gamma‐irradiated phosphor LaPO4 |
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