Mn2+-doped LiMg1-xMnxPO4 (x = 0.0035-1) solid solutions were prepared by conventional solid state reaction. A systematic structural of the solid solution series was carried out by X-ray powder diffraction. The emission and excitation spectra were employed to characterize the synthesized phosphors. The XRD results reveal that the samples adopt an olivine (Mg2SiO4) type structure with the space group Pnma. With increasing Mn2+ concentration, the XRD patterns shift systemically to lower angle in indexes of (200), (131), and (211) with all other lines, confirming the formation of solid solutions. The great red-shift of Mn2+ emission with increasing Mn (2+)-concentration from 0.35 to 100 mol% in LiMg1-xMnxPO4 is observed. The CIE coordinates and the emission shift of Mn2+ ions in LiMg1-xMnxPO4 are discussed in relation to the structural properties of LiMg1-xMnxPO4.

Keywords: Solid solution; Luminescence; Color turning; LiMg1-xMnxPO4; Mn2+