Ce3+,Dy3+ Co-Doped White-Light Long-Lasting Phosphor: Sr2Al2SiO7 Through Energy Transfer

White-light long-lasting phosphor Sr2Al2SiO7:Ce3+,Dy3+ was prepared by a high temperature solid-state reaction. The energy transfer between Ce3+ and Dy3+ was systematically investigated. Through co-doped Ce3+ and Dy3+, the duration of the persistent luminescence of Sr1.975Al2SiO7:Ce-0.005,Dy-0.03 reached nearly 50 min. The decay curves and thermoluminescence spectra were used to characterize what kind of trap existed in the sample. A possible afterglow mechanism was presented and discussed. This work provides a promising approach for the development of white-light long-lasting phosphor. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3371488] All rights reserved.