Interaction of rare earth ions in Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu^sup 2+^, Dy^sup 3+^ material

To discuss the function of Eu and Dy and their interaction in Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu^sup 2+^, Dy^sup 3+^ long afterglow material, the Eu and Dy single doped and their co-doped Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu^sup 2+^, Dy^sup 3+^ were prepared. The samples were characterized by X-ray diffraction (XRD), decay curves, photoluminescence (PL), and thermoluminescence (TL). The results indicate that Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu has afterglow properties, and the doping of Eu ion in Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu^sup 2+^, Dy^sup 3+^ can lower the depth of traps. Eu ion can not only serve as luminescence center, but also produce traps in the matrix, meanwhile, it also exerts certain influences on the traps produced by Dy in Sr^sub 2^MgSi^sub 2^O^sub 7^: Eu^sup 2+^, Dy^sup 3+^. The Dy ion can not act as luminescence center but relates to the change of the traps in the Sr^sub 2^MgSi^sub 2^O^sub 7^ matrix.