Photo-luminescence Properties of Phosphate Doped with Tm

Photo-luminescence Properties of Phosphate Doped with Tm
　　In this work,we use the Tm3+to replace Eu2+of BAM (BaMgAl10O17:Eu2+)phosphor.And that is the phosphate activated by Tm3+.In this paper,a series of powder samples of GdPO4:Tm3+,M3Gd(PO4)3:Tm3+,MBPO7: Tm3+,Gd3+,MBPO7:Tm3+was prepared under a reducing atmosphere by solid-state reaction.And the characteristic about fabric and luminescence were studied.The X-ray powder diffraction data of the powder samples are in agreement of JCPDS standard card. The dopant rare earth ion would have little influence on the structure of Ring neodymium magnet luminescent host.So the compositive material is the phosphate.The samples GdPO4:Tm3+,M3Gd(PO4)3:Tm3+(M=Sr,Mg,Ca,Ba)have strong absorption at VUV(165nm)due to the strong absorption of the host lattic.The absorption of Sr3Gd(PO4)3:Tm3+at 165 are stringer than that of GdPO4:Tm3+,the energy transitions of Sr3Gd(PO4)3:Tm3+between Tm3+and host lattic is strong,,so the intensity of absorption of the is strong.In the M3Gd(PO4)3,the intensity of absorption of host lattic become strong as the increase of radii cation.
　　As the molar of cation of the samples MBPO7:Tm3+,Gd3+(M-Sr,Mg,Ca,Ba)minish,the absorption have a shift from 161nm to 189nm.The samples GdPO4:Tm3+,M3Gd(PO4)3:Tm3+MBPO7:Tm3+,Gd3+,MBPO7:Tm3+ (M=Sr,Mg,Ca,Ba)have strong emission at 454nm and 363nm under VUV(161nm). The peaks http://www.chinamagnets.biz/ are due to the 1D2→3H4 and 1D2→3H6 transitions of Tm3+.As the f molar of cation minish,The emission of samples M3Gd(PO4)3:Tm3+,MBPO7:Tm3+,Gd3+, MBPO7:Tm3+(M=Sr,Mg,Ca,Ba)at 454nm and 363nm is increased.The Gd3+as the host lattic at the samples GdPO4:Tm3+,M3Gd(PO4)3:Tm3+can have absorption,and have effect about focus of luminescence.However the Gd3+as the intermingle cation at boron phosphate MgBPO7:Tm3+(2%),Gd3+(2%)have emission at 312nm about Gd3+,and this is disadvantage for the energy transitions to focus of luminescence.The emission of Tm3+has reduced because of the energy absorption competition between Tm3+and Gd3+at VUV.