Green emitting long lasting phosphorescence (LLP) properties of Mg2SnO4:Mn2+ phosphor

A novel long-lasting phosphorescence phosphor, Mn2+-activated Mg2SnO4, has been synthesized and its optical properties have been investigated. The Mg2SnO4:Mn2+ emits green light with high luminance, upon UV irradiation, centered at 499 nm from the spin forbidden transitions of the d-electrons in Mn2+ ions. The CIE chromaticity coordinates of the Mg2SnO4:Mn2+ phosphor are x=0.0875 and y=0.6083 under 254 nm UV excitation. The phosphorescence can be observed by the naked eyes (0.32 mcd/m2) in the dark clearly for over 5 h after the 5 min UV irradiation. Thermoluminescence has been studied and the mechanism of the long-lasting phosphorescence has been discussed.