Synthesis And Properties Of Upconversion Luminescence Agents Er³⁺:Y₃Al₅O₁₂ And Er³⁺:YAlO₃with Different Doping Atoms

In recent years，with the developing of dye industry, waste water was dischargedinto rivers and lakes, which leads to threat to human. More and more people focus onphotocatalytic degradation. TiO₂has been used for photocatalyst, due to its low cost,high photosensitivity. TiO₂can only use ultraviolet, which limits the use of solar light.In earlier investigations, researchers tried to ameliorate the properties of TiO₂particles by doping ions in order to improve its photocatalytic activity. Upconversionluminescence agents Er³⁺:Y₃Al₅O₁₂and Er³⁺:YAlO3were used to increase theemission intensity, and it can excite TiO₂effectively. But these methods are stillinsufficient to improve the activity of TiO₂. In this paper, metal and nonmetallicatoms （Yb, B, Ga, N and F） were used to widen the spectra scope and intensity ofupconversion luminescence agents.In this research, we synthesis Er³⁺:Yb_nY_3-nBaGa_bAl_5-a-bO₁₂（0.10<n<0.40，1.25<a<2.50，1.25<b<2.50）, Er³⁺:Yb_nY_3-nAl₅N_xF_yO_12-x-y（0.10<n<0.40,0.005<x<0.01,0.005<y<0.01）, Er³⁺:Yb_nY_1-nBaGabAl_1-a-bO₃（0.25<n<0.50,0.25<a<0.05,0.25<b<0.50）, Er³⁺:Yb_nY_1-nN_xF_yAlO_3-x-y（0.25<n<0.50,0.005<x<0.01,0.005<y<0.01）and corresponding photocatalysts Er³⁺:Yb_nY_3-nBaGa_bAl_5-a-bO₁₂/TiO₂（0.10<n<0.40,1.25<a<2.5,1.25<b<2.5）, Er³⁺:Yb_nY_3-nAl₅N_xF_yO_12-x-y/TiO₂（0.10<n<0.40,0.005<x<0.01,0.005<y<0.01）, Er³⁺:Yb_nY_1-nBaGabAl_1-a-bO₃/TiO₂（0.25<n<0.50,0.25<a<0.50,0.25<b<0.50）, Er³⁺:Yb_nY_1-nN_xF_yAlO_3-x-y/TiO₂（0.25<n<0.50,0.005<x<0.01,0.005<y<0.01） through sol-gel method. X-ray powder diffraction（XRD） and Scanning electron microscopy （SEM） were used to characterize thesurface structure of photocatalysts. Fluorescence spectrophotometer and Ultravioletspectrometer are used to characterize the absorption and emission spectra and theupconversion luminescence was detected. Acid Red B was used to detecte thephotocalytic activity of photocatalysts and the universal propertity was tested.