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Photoluminescence and thermoluminescence studies of CaAl2O4:Dy3+ phosphor
Authors:Mohammad Ziyauddin  Shalinta Tigga  Nameeta Brahme  D P Bisen
Institution:School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India
Abstract:Calcium aluminate phosphors activated by Dy3+ have been prepared by a combustion method at a temperature of 600°C. Photoluminescence (PL) and thermoluminescence (TL) properties of gamma‐irradiated Dy‐doped calcium aluminate were investigated. The PL spectrum shows a broad peak around 488 nm and 573 nm, under 347 nm excitation. Thermoluminescence studies were performed for different concentrations of Dy. Optimum intensity of photoluminescence was found for 0.02 mol% concentration of Dy. It was found that initially the peak TL intensity increases with increasing concentration of Dy in the CaAl2O4 host, attains a maximum value for 0.05 mol% concentration and decreases with further increase in the doping concentration due to concentration quenching. Copyright © 2015 John Wiley & Sons, Ltd.
Keywords:thermoluminescence (TL)  photoluminescence (PL)  CaAl2O4:Dy3+  combustion synthesis
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