Yellow Photo-Stimulated Long Persistent Luminescence in Strontium Silicate Phosphor

Here we report a new type of photo-stimulable storage material exhibiting a super-long (> 20 h) yellow persistent luminescence with the assistance of 980 nm stimulation. The thermoluminescence glow curves indicate that the incorporation of Lu3+ into Sr3SiO5:Eu2+ generates a large number of traps with different depths. Analysis illustrated that the photo-stimulation process contributed to electron trap redistribution, especially the refilling of the shallow traps, which results in a strongly prolonging LPL time for the ultraviolet pre-irradiated Sr3SiO5:Eu2+, Lu3+. This finding also elucidates that the retrapping process of the electron released from the deep trap plays an important role in the LPL process. (C) 2013 The Electrochemical Society. All rights reserved.