Sr4GaNbO8:Mn4+: a novel perovskite-structured red-emitting phosphor for a luminescence lifetime thermometer with good relative sensitivity and repeatability

A new type of niobate perovskite structure Sr 4 GaNbO 8 :Mn 4+ has been prepared by us, which is different from previous perovskite compounds and has excellent relative and absolute sensitivities as well as good repeatability.