Synthesis and thermoluminescence properties of strontium aluminate

In this work, strontium aluminate (Sao) nano phosphor was synthesized by the solid-state reaction method and their structure analysis was carried by X- ray diffraction (XRD) method. The XRD analysis was carried out using the Match program for phase identification that shows the presence of strontium aluminate nano phosphor phases. Thermoluminescence (Tl) glow curves of Sao pellets irradiated in the range 1 Gy up to 13 Gy with a gamma source (Co-60) show three peaks, a very intense peak at 260 °C, and two peaks of lower intensity at 146 °C and 376 °C. Effect of UV irradiation was also studied on these Sao pellets by irradiating with a xenon UV source for 10 to 90 seconds. Two Tl glow peaks at 150 and 272 °C were recorded in the samples. Tl intensity was found to increase with UV dose. The kinetic parameters of the Tl peaks were calculated for the Sao nano phosphors obtaining 1.05, 1.6 and 1.9 activation energy. Absorbance measurements were carried out and a band gap of 6.15 eV was estimated using the Tau method. (author)