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Fluorescence and long lasting emission properties of Sr4Al14O25:Eu2+,Dy3+ were examined under proton irradiation by varying incident energy. The fluorescence spectra have three strong peaks at 400, 480, and 570 nm. The first two peaks are attributed to the luminescence of Eu2+ and exhibit the long lasting property. The peak at 570 nm is attributed to the luminescence of Dy3+; it exhibits no luminescence...
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