Luminescence characteristics of advanced green phosphor CeO2:Mn(Ⅱ)
A series of Mn-doped CeO2 green phosphors(CeO2:Mn2+)with doping molar fractions of 0.01-0.04 were firstly synthesized by using cerium oxide and manganese carbonate as main materials and alumina as a dispersant via solid-state reaction under carbon condition.The crystal structure,particle size,microstructure and luminescence properties of obtained CeO2:Mn2+samples were analyzed.It indicated that the CeO2:Mn2+samples are of pure cubic fluorite-type CeO2 phase.The addition of alumina dispersant can avoid CeO2 host sintering and promote luminescent center doping,while the alumina does not significantly change samples'crystal structure.The particle sizes are within range of 6-10 μm,and the particle morphology is of ellipsoid and cuboid.Fluorescence spectroscopy results show that,with luminescent center doped with Mn2+,the samples can emit green light with high luminous intensity under 272 nm ultraviolet light exciting,and CeO2:0.033Mn has the best luminescence property among the samples.The CeO2:Mn2+green phosphors are expected to have good application prospects in the field of display and lighting.