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On the study of C6+ ion beam and γ-ray induced effect on structural and luminescence properties of Eu doped LiNaSO4: Explanation of TSL mechanism by using PL, TL and EPR study

Abstract

The present paper reports on the γ-rays and C6+ ion beam induced effect on the structural and luminescence properties of Eu doped LiNaSO4 phosphors synthesized via wet chemical method. The material was irradiated by 60Co and 137Cs γ-rays and 75 MeV C6+ ions in the fluence range varying from 2X1010 to 1X1012 ion/cm2. The ion induced modified properties were investigated by using X-ray diffractometer (XRD), micro-Raman Spectroscopy, photoluminescence (PL), thermoluminescence (TL) and electron paramagnetic resonance (EPR) study. The XRD and the micro-Raman results confirm the loss of crystallinity and elongation of the lattice parameters after ion beam irradiation. The presence of both divalent as well as trivalent state of Eu ion at multiple sites of LiNaSO4 is observed by the PL study. Irradiation of LiNaSO4:Eu phosphor with C6+ ion beam modifies the population of valence state of doped rare earth Eu ion and enhances the TL sensitivity of this phosphor. The nature of prominent TL glow curve is identical for both γ-rays and C6+ ion beam irradiated materials while additional deep trap levels are appeared in the later one due to the formation of several types of cation and anion vacancies. The electron paramagnetic resonance (EPR) technique also supports the presence of Eu ion at multiple sites and provides the information regarding several types of radicals produced after γ-ray and C6+ ion irradiation. Finally, a mechanism is presented for the thermally stimulated luminescence phenomenon on the basis of our observed results of PL, TL and EPR studies. The reason behind ion beam irradiation induced modification of TL properties and enhancement of luminescence intensity is also explained in this section.

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Publication details

The article was received on 26 Aug 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP05835G
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    On the study of C6+ ion beam and γ-ray induced effect on structural and luminescence properties of Eu doped LiNaSO4: Explanation of TSL mechanism by using PL, TL and EPR study

    K. K. Gupta, R. Kadam, N. S. Dhoble, S. P. Lochab and S. J. Dhoble, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05835G

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