A novel red long lasting phosphorescent (LLP) material β-Zn 3(PO 4) 2:Mn 2+, Sm 3+

Abstract

A novel red long lasting phosphorescent materials β-Zn 3(PO 4) 2:Mn 2+,Sm 3+ is firstly synthesized by high-temperature solid-state reaction. The influence of Sm 3+ ions on luminescence and long lasting phosphorescence properties of Mn 2+ in phosphor β-Zn 3(PO 4) 2:Mn 2+,Sm 3+ are systematically investigated. It is found that the red phosphorescence ( λ = 616 nm) performance of Mn 2+ ion such as brightness and duration is largely improved when Sm 3+ ion is co-doped into the matrix in which Mn 2+ ion acts as luminescent center and Sm 3+ ion plays an important role of electron trap. Thermoluminescence spectrums show that there exists one peak in β-Zn 3(PO 4) 2:Mn 2+,Sm 3+, the depth of which is 0.33 eV, and that there are three peaks in β-Zn 3(PO 4) 2:Mn 2+, among which the depth of the lowest temperature peak in β-Zn 3(PO 4) 2:Mn 2+ is 0.37 eV. Such differences in the trap depth result in the improvement of red long lasting phosphorescence of Mn 2+ in present matrix.