Abstract
A novel orange-yellow long-lasting phosphor (LLP) Li2SrSiO4:Eu2+, Dy3+ was developed. The incorporation of the orbitals of Dy3+ in the formation of the discrete level associated with oxygen vacancy (Vo..) causes a change in the number of traps, which largely extends the thermoluminescence characteristics and evidently improves the long persistent luminescence property of the phosphor. Both fluorescence and phosphorescence spectra of Li2SrSiO4:Eu2+, Dy3+ reveal broad and intensive emission extending from 500 to 700nm with a peak at about 567nm, this indicates that photoluminescence(PL) and long-lasting luminescence (LLL) are from the same Eu2+ ions center. After the removal of UV light, the afterglow of the sample with the optimum doping concentration can persist over 15h above the recognizable intensity level (≥0.32mcd/m2).
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