Abstract
In this paper, we present a color tunable long persistent phosphor, prepared by using a remote phosphor. The blue light emission of Sr2MgSi2O7: Eu2+, Dy3+ long persistent phosphor was tuned from blue to near white region with the help of Y3Al5O12: Ce3+ as remote phosphor. To achieve the multicolor tunability, the two phosphors, Sr2MgSi2O7: Eu2+, Dy3+ and Y3Al5O12: Ce3+ were mixed in a different weight ratio(S: Y). The cause behind such kind of color tunability is the persistent radiative energy transfer from long persistent luminescence (LPL) of Sr2MgSi2O7: Eu2+, Dy3+ phosphor to non-LPL Y3Al5O12: Ce3+ phosphor. The composite Sr2MgSi2O7: Eu2+, Dy3+/Y3Al5O12: Ce3+ has a long afterglow with steady color during decay. To excite Y3Al5O12: Ce3+ phosphor, here we used the blue light energy of the Sr2MgSi2O7: Eu2+, Dy3+ as a phosphorescent light source. Our principal objective to achieve color tunable long persistent phosphors was obtained by combining these two, blue and yellow, light emissions. For detailed investigations, the phosphors were further characterized by XRD, Photoluminescence and afterglow decay. So our approach may be a way to convert the color of other long persistent phosphor by using remote phosphor.
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