Thermoluminescence Studies in Europium Doped KSr2Br5 and CsBa2I5 Halide Phosphors

Divalent Europium (Eu2+) doped alkali halides KSr2Br5 and CsBa2I5 phosphors are synthesized by wet chemical method. These phosphors are characterized for Thermoluminescence (TL) properties. Different γ-dose using Co60 source are used to irradiate the samples. For CsBa2I5:Eu2+, thermoluminescence curve shows maxima at 207.5 °C and for KSr2Br5:Eu2+, TL maxima peaks around 261.74 °C which are related to the defects at trap depths. Kinetic parameters of the peak are calculated. The activation energy value for KSrBr5 and CsBa2I5 are 1.5 eV and 0.811 eV respectively, suggest a possible good stability of the trapped charges produced during irradiation. Hence, Eu (0.5%) doped KSr2Br5 and CsBa2I5 phosphors could be used for possible TL Dosimetry applications.