Er^(3+)/Yb^(3+)co-doped Li_3Ba_2Gd_3(Mo O_4)_8 phosphors were synthesized by conventional solid state reaction method,and their structure and spectral properties were investigated.The diffuse reflectance spectra showe...Er^(3+)/Yb^(3+)co-doped Li_3Ba_2Gd_3(Mo O_4)_8 phosphors were synthesized by conventional solid state reaction method,and their structure and spectral properties were investigated.The diffuse reflectance spectra showed that the ~4I_(15/2)→~4I_(11/2) transition of Er^(3+)and the ~2F_(7/2)→~2F_(5/2)transition of Yb^(3+)ions were highly overlapped.Under the excitation of 980 nm,three up-conversion(UC)luminescence bands around 530,555 and 660 nm were observed,corresponding to the^2H_(11/2)→~4I_(15/2),~4S_(3/2)→~4I_(15/2) and ~4F_(9/2)→~4I_(15/2) transitions of Er^(3+)ions,respectively.The effects of the concentration and pumping power on the UC intensities of Li_3Ba_2Gd_3(Mo O_4)_8:Er^(3+)/Yb^(3+)phosphors were investigated,and the possible UC mechanism was proposed based on the results.展开更多
基金supported by the Natural Science Foundation of Shandong Province(ZR2014JL029,BS2015CL012,ZR2015BM005)
文摘Er^(3+)/Yb^(3+)co-doped Li_3Ba_2Gd_3(Mo O_4)_8 phosphors were synthesized by conventional solid state reaction method,and their structure and spectral properties were investigated.The diffuse reflectance spectra showed that the ~4I_(15/2)→~4I_(11/2) transition of Er^(3+)and the ~2F_(7/2)→~2F_(5/2)transition of Yb^(3+)ions were highly overlapped.Under the excitation of 980 nm,three up-conversion(UC)luminescence bands around 530,555 and 660 nm were observed,corresponding to the^2H_(11/2)→~4I_(15/2),~4S_(3/2)→~4I_(15/2) and ~4F_(9/2)→~4I_(15/2) transitions of Er^(3+)ions,respectively.The effects of the concentration and pumping power on the UC intensities of Li_3Ba_2Gd_3(Mo O_4)_8:Er^(3+)/Yb^(3+)phosphors were investigated,and the possible UC mechanism was proposed based on the results.
