An Approach to Tune the Color of Sr2MgSi2O7: Eu2+, Dy3+Long Persistent Phosphor Using Y3Al5O12: Ce3+Remote Phosphor

In this paper, we present a color tunable long persistent phosphor, prepared by using a remote phosphor. The blue light emission of Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ long persistent phosphor was tuned from blue to near white region with the help of Y 3 Al 5 O 12 : Ce 3+ as remote phosphor. To achieve the multicolor tunability, the two phosphors, Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ and Y 3 Al 5 O 12 : Ce 3+ 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 Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ phosphor to non-LPL Y 3 Al 5 O 12 : Ce 3+ phosphor. The composite Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ /Y 3 Al 5 O 12 : Ce 3+ has a long afterglow with steady color during decay. To excite Y 3 Al 5 O 12 : Ce 3+ phosphor, here we used the blue light energy of the Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ 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.