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Title: Effect of deformation on the thermoluminescence of BaSO4:Tb phosphors
Authors: Upadhyay, A K
Gulhare, Vikas
Dhoble, S J
Kher, R S
Keywords: Thermoluminescence;BaSO4
Issue Date: Jun-2011
Publisher: NISCAIR-CSIR, India
Abstract: Thermoluminescence (TL) of BaSO4 phosphors has been studied. BaSO4:Tb phosphors having different concentration of Tb were prepared by solid state reaction method and their TL has been studied after gamma irradiation. Two distinct peaks are observed in the TL glow curve, one around 150°C and another around 210°C. It is also observed that TL peak at 150°C increases with gamma dose given to the samples. However, TL peak around 210°C saturates for gamma dose higher than 0.930 kGy. In order to study the effect of deformation on the TL, a load was dropped on to the sample with different impact velocities. TL intensity of both the peaks decreases when the TL glow curve is recorded after deforming the irradiated samples. TL emission spectrum and photoluminescence (PL) study on the sample show two prominent peaks around 480 and 550 nm due to 5D47F6 and 5D47F5 transitions of Tb3+ ions. It is suggested that the recombination of electrons released from the traps during the thermal excitation is responsible for the luminescence in this system and the deformation of sample damages the traps centers which reduces the TL intensity of the sample
Page(s): 382-384
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(06) [June 2011]

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