Control Synthesis And Luminescence Properties Of Lanthanide Phosphate And Oxide

Due to the excellent optical properties, rare earth luminescence materials can be widely used in the areas, such as illumination, display, biomedical imaging, radiation field detect and the fabrication of the solar cell devices. It is of great importance to explore the synthesis method of luminescence materials, the relationship of optical properties and microscopic or submicroscopic size, the relationship of transition of electron and optical properties and then finely tune the luminescence properties. The research of this paper is mainly focused on the control synthesis of the lanthanide phosphate and oxide.LaPO4,Ce3+ doped LaPO4 and Ce3+, Tb3+ codoped LaPO4 phosphate luminescence materials were synthesized by hydrothermal method. The morphologies of the nano-particles by the factors, such as pH value, the amount of the complexing agent (EDTA). Also, the type and amount of doped ion have an impact on the morphology and the irregularity of the morphology. Also, their optical characteristic has been explored. In the condition of alkaline with complexing agent, the aspect ratio of the LaPO4,Ce3+ doped LaPO4 and Ce3+, Tb3+ codoped LaPO4 phosphate increased. When the Ce3+, Tb3+ doped into LaPO4, it shows that the morphology of the LaPO4 will become more and more irregular with the increasing of types of doped ions. The optica characteristic has been tested by (PhotoLuminescence, PL) and Decay Times, it shows that the Ce3+ doped LaP04 and Ce3+ Tb3+ codoped LaPO4 phosphate have characteristic spectrum of 5d-4f(Ce3+) and 5D4-7Fj(j=6-3)(Tb3+). Under laboratory condition, the LaPO4,Ce3+ doped LaPO4 and Ce3+ Tb3+ codoped LaPO4 phosphate have been fabricated by scale-up, the optica characteristic has been explored, also the productivity has been compared.The method of hollow spheres has advantage of saving rare materials, and Gd2O3:Eu3+ spheres have potential application in bio-label and nuclear magnetic resonance contrast reagent. Hollow Gd2O3:Ln(Ln=Sm3+,Eu3+) spheres have been fabricated by a sacrificed method in which the cabon spheres are used as templates and urea as precipitant and then the as-obtained products are calcinated. In the whole process, the size of the carbon spheres has a great impact on the coating. It shows that when the temperature is 90°C, the time of water bath is 3 hours and carbon spheres is 300-500 nm, the precursors shows dimensional homogeneity. In the hollow spheres luminescence materials, the Gd2O3:Eu3+ spheres exhibit excellent optical properties.