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Journal of Nanomaterials
Volume 2015 (2015), Article ID 136402, 7 pages
http://dx.doi.org/10.1155/2015/136402
Research Article

Luminescence Properties of CaF2 Nanostructure Activated by Different Elements

1Center of Nanotechnology, King Abdulaziz University, Jeddah 21589, Saudi Arabia
2Sciences Faculty for Girls, King Abdulaziz University, Jeddah 21589, Saudi Arabia
3Department of Aeronautical Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India

Received 29 September 2014; Accepted 9 December 2014

Academic Editor: Songjun Zeng

Copyright © 2015 Numan Salah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanostructures of calcium fluoride (CaF2) doped with Eu, Tb, Dy, Cu, and Ag were synthesized by the coprecipitation method and studied for their thermoluminescence (TL) and photoluminescence (PL) properties. The PL emission spectrum of pure CaF2 nanostructure has a broad band in the 370–550 nm range. Similar spectra were observed in case of doped samples, beside extra bands related to these impurities. The maximum PL intensity was observed in Eu doped sample. The TL results of Eu, Cu, Ag, and Tb doped samples show weak glow peaks below 125°C, whereas Dy doped one is found to be highly sensitive with a prominent peak at 165°C. This sample was further exposed to a wide range of gamma rays exposures from 137Cs source. The response curve is linear in the 100 Gy-10 kGy range. It is also observed that the particle size of CaF2 nanostructure was significantly reduced by increasing Dy concentration. These results showed that Dy is a proper activator in the host of CaF2 nanostructure, providing a highly sensitive dosimeter in a wide range of exposures and also plays a role as a controlling agent for particle size growth.