enabling sensitive point-of-care diagnostics, particularly with smartphone-based biosensing
devices in testing formats such as the lateral flow assay (LFA). Here, the development of
persistent phosphors for this application is focused on the solid solution (Sr1− δBaδ)
2MgSi2O7: Eu2+, Dy3+ (δ= 0, 0.125, 0.25, 0.375), which is prepared using a high-
temperature solid-state reaction as confirmed by synchrotron X-ray powder diffraction. The …