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IJPAP Vol.47(06) [June 2009] >


Title: Luminescence studies in KMgF3:Eu,Ag
Authors: Madhusoodanan, U
Jose, M T
Indira, R
Rao, T K Gundu
Keywords: Alkali halides
Electron spin resonance
Luminescence
Radiation dosimetry
Issue Date: Jun-2009
Publisher: CSIR
Abstract: A new sensitive material KMgF3:Eu,Ag has been developed with double dopants europium (Eu) and silver (Ag) by melting equal molecular proportions of KF and MgF2 along with dopants (0.2 mol % each) in argon atmosphere. Luminescence studies have been carried out in this material to check its possible use in radiation dosimetry applications. Thermoluminescence (TL) studies in this material show that its TL sensitivity is three times that of the existing tissue equivalent material LiF:Mg,Ti (TLD-100), while KMgF3 doped with Eu alone and Ag alone shows sensitivities equal to that of TLD-100. KMgF3:Eu,Ag shows a major TL peak around 240oC unlike TLD-100 which has a complicated glow curve shape. The TL emission spectra of gamma irradiated material show characteristic emission of Eu2+. Compared to KMgF3:Eu, the emission intensity of Eu has been found more in KMgF3:Eu,Ag. Photoluminescence studies show that there is no conversion of Eu2+to Eu3+ on gamma irradiation. Electron spin resonance (ESR) studies have been carried out in this material to check if there is any valance conversion of Eu and Ag. Both the irradiated as well as unirradiated materials show signal for Eu2+ ion and did not show any signal for Ag2+ ion. Hence, in the presence of Ag+ more Eu2+ is entering into the crystal lattice which enhances the luminescence efficiency.
Page(s): 459-460
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.47(06) [June 2009]

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