Analysis of Thermoluminescence Glow Peaks in β -Irradiated TlGaSeS Crystals
M. Isika, T. Yildirim b and N.M. Gasanlyc,d
aDepartment of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey
bDepartment of Physics, Nevsehir University, 50300 Nevsehir, Turkey
cDepartment of Physics, Middle East Technical University, 06800 Ankara, Turkey
dVirtual International Scientific Research Centre, Baku State University, 1148 Baku, Azerbaijan
Received: April 1, 2015; In final form: April 13, 2016
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Thermoluminescence properties of TlGaSeS layered single crystals were investigated in the temperature range of 280-720 K. Thermoluminescence glow curve exhibited three peaks with maximum temperatures of ≈370, 437, and 490 K. Curve fitting, initial rise and peak shape methods were used to determine the activation energies of the trapping centers. All applied methods resulted with energies around 0.82, 0.91, and 0.99 eV. Dose dependence of the thermoluminescence intensity was also examined for the doses in the range of 0.7-457.6 Gy. Peak maximum intensity of the observed peak around 370 K showed an increase up to a certain dose and then a decrease at higher doses. This non-monotonic dose dependence was discussed under the light of a reported model in which different kinds of competition between radiative and nonradiative recombination centers during excitation or heating stages of the thermoluminescence process are explained.

DOI: 10.12693/APhysPolA.129.1165
PACS numbers: 78.60.Kn, 71.55.Ak, 61.82.Fk