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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(06) [June 2011] >
| 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 5D4 → 7F6 and
5D4 → 7F5 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(06) [June 2011]
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