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 Thermoluminescence Glow Curve Analysis Of Eu3+ Activated CaWO4 Phosphor

K. V. Dabre and S. J. Dhoble

Volume 4, Issue 12, Page 921-926, Year 2013 | DOI: 10.5185/amlett.2013.3430

Keywords:

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

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 619nm which corresponds to the characteristic transition 5D07F2 of Eu3+ ion at excitation wavelength 273nm. 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. Copyright © 2013 VBRI press. 

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