Abstract
SrAl2O4 phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl2O4. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O− ion. O− ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F+ center (singly ionized oxygen vacancy). This center relates to the 135 °C TL peak.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
