Thermoluminescence Glow Curve Analysis Of Eu3+ Activated CaWO4 Phosphor

¹Deptartment of Physics, Arts, Commerce & Science College, Koradi, Nagpur 441111, India

²Department of Physics, R.T.M. Nagpur University, Nagpur 440033, India

Adv. Mater. Lett., 2013, 4 (12), pp 921-926

DOI: 10.5185/amlett.2013.3430

Publication Date (Web): Nov 24, 2013

Copyright © IAAM-VBRI Press

E-mail: sjdhoble@redffmail.com

Abstract

In this work we report the synthesis of CaWO₄ pure and doped by various concentration of Eu³⁺ by solid state method. Crystallinity and formation of as-synthesized phosphors were confirmed by XRD technique. PL emission of the Eu³⁺ activated as-synthesized phosphors shows the strong red emission at 619 nm which corresponds to the characteristic transition ⁵D₀ → ⁷F₂ of Eu³⁺ ion at excitation wavelength 273 nm. TL glow curve of Eu³⁺ activated CaWO⁴ shows the two glow peaks was observed at 400K and 500K whereas undoped CaWO4 shows only single peak observed at low temperature (354K). Doping effect on TL glow curve was discussed. Glow curve of Eu³⁺ activated were fitted to five peaks which were analyzed and trap parameter were calculated by using Chens’ method, and the dose response curve shows the phosphor is fairly sensitivity to lower dose also. Thus reported phosphor can be applicable in LED and environmental dosimetry.

Keywords

Scheelite structured tungstate, thermoluminescence, glow curve analysis, photoluminescence, solid state diffusion, radiation dosimetry.