Han Xiumei, Lin Jun(1.Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; 2.Institute of New Materials, North East University, Qinhuangdao 066004, China)
Ca_2Gd_8(SiO_4)_6O_2∶ A(A=Pb~(2+), Tm~(3+))phosphors were prepared through the sol-gel process. X-ray diffraction(XRD), scanning electron microscopy(SEM)and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicate that the phosphors crystallized completely at 1000 ℃. SEM study reveals that the average grain size is 300～1000 nm. In Ca_2Gd_8(SiO_4)_6O_2∶Tm~(3+) phosphors, the Tm~(3+) shows its characteristic blue emission at 456 nm(~1D_2—~3F_4)upon excitation into its ~3H_6—~(1)D_2(361 nm), with an optimum doping concentration of 1mol% of Gd~(3+) in the host lattices. In Ca_2Gd_8(SiO_4)_6O_2∶Pb~(2+), Tm~(3+) phosphors, excitation into the Pb~(2+) at 266 nm(~1S_0—~3P_1)yields the emissions of Gd~(3+) at 311 nm(~6P—~8S)and Tm~(3+) at 367 nm(~1D_2 —~3H_6)and 456 nm(~1D_2—~3F_4), indicating that energy transfer processes of Pb~(2+)—Gd~(3+) and Pb~(2+)—Tm~(3+) have occurred in the host lattices.
silicate oxyapatite; luminescence; Tm~(3+); Pb~(2+); energy transfer;rare earths
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