Concentration-dependent effects of optical storage properties in CSSO:Dy

The optical storage properties of CSSO:Dy as a function of the dysprosium concentration were investigated. Following 980 nm excitation, the photo-stimulated luminescence of white-light was first observed in CSSO:Dy. TL curves revealed that there existed three types of trap (T-1, T-2, T-3) in CSSO:Dy corresponding to the temperature bands, located at 300, 424 and 525 k, respectively. With increasing dopant contents, the amount of the deep traps (T-2 and T-3) increases, whereas the shallow traps concentration decreases. The results demonstrate that the optical storage ability of CSSO:Dy is enhanced with increasing Dy3+ contents at room temperature. (C) 2013 Published by Elsevier B.V.