Long persistent luminescence in the ultraviolet in Pb2+-doped Sr2MgGe2O7 persistent phosphor†
Abstract
We extend the persistent luminescence into the ultraviolet spectral region by developing a new ultraviolet persistent phosphor Sr2MgGe2O7:Pb2+. The Sr2MgGe2O7:Pb2+ phosphor exhibits strong persistent luminescence peaking at 370 nm and a long persistence time of >12 h after excitation. The phosphor also exhibits a photo-stimulated persistent luminescence capability.