Up-conversion photoluminescence emissions of CaMoO4：Pr3＋/Yb3＋ powder

• Published in: Journal of rare earths Vol. 35; no. 7; pp. 645 - 651
• Main Author: 李金萍 张婷婷 朱刚强 郑海荣
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2017
• Subjects: hydrothermal method; optical properties; rare earths; up-conversion luminescence; X射线衍射; 上转换发光; 上转换机制; 扫描电子显微镜; 排放源; 最佳掺杂浓度; 浓度依赖性; 镱; up-conversion luminescence; optical properties; rare earths; hydrothermal method
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(17)60958-X

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.