摘要
CaMoO_4:Pr^(3+)/Yb^(3+) powder was successfully synthesized by a facile hydrothermal method. X-ray diffraction(XRD) patterns of samples confirmed tetragonal structure and morphology and sizes were confirmed by scanning electron microscopy(SEM) analyses. Particles consisted of regular micro-spheres with uniform sizes, the diameter of each sphere lay in the range of 3 to 4 μm. The up-conversion photoluminescence emission and its concentration dependence were investigated under infrared excitation at 980 nm. All the UC micro-particles exhibited the typical blue, green and red emissions. Dominant blue emissions originated from ~3P_0→~3H_4 and intense red emissions originated from ~3P0→~3F_2 transitions, and they both belonged to two-photon excitation processes in CaMoO_4: Yb^(3+)/Pr^(3+) powder. The optimum doping concentrations of Pr^(3+) and Yb^(3+) for the highest UC luminescence were 0.1 mol.% and 16 mol.%, respectively. The possible up-conversion mechanisms were discussed in detail. It was found that the UC emission could be well controlled from blue to green to white color by adjusting the concentration of Pr^(3+) ions in CaMoO_4:Pr^(3+)/Yb^(3+) microcrystal. So it is a candidate material for solid-state lasers, biological imaging, solar cells, and optical communications.
CaMoO_4:Pr^(3+)/Yb^(3+) powder was successfully synthesized by a facile hydrothermal method. X-ray diffraction(XRD) patterns of samples confirmed tetragonal structure and morphology and sizes were confirmed by scanning electron microscopy(SEM) analyses. Particles consisted of regular micro-spheres with uniform sizes, the diameter of each sphere lay in the range of 3 to 4 μm. The up-conversion photoluminescence emission and its concentration dependence were investigated under infrared excitation at 980 nm. All the UC micro-particles exhibited the typical blue, green and red emissions. Dominant blue emissions originated from ~3P_0→~3H_4 and intense red emissions originated from ~3P0→~3F_2 transitions, and they both belonged to two-photon excitation processes in CaMoO_4: Yb^(3+)/Pr^(3+) powder. The optimum doping concentrations of Pr^(3+) and Yb^(3+) for the highest UC luminescence were 0.1 mol.% and 16 mol.%, respectively. The possible up-conversion mechanisms were discussed in detail. It was found that the UC emission could be well controlled from blue to green to white color by adjusting the concentration of Pr^(3+) ions in CaMoO_4:Pr^(3+)/Yb^(3+) microcrystal. So it is a candidate material for solid-state lasers, biological imaging, solar cells, and optical communications.
基金
Project supported by the National Science Foundation of China(11574190)
the Fundamental Research Funds for the Central Universities(GK201503024)