Doping rare earth ions Lu_2O_3 and LuAG phosphors, Preparation and Properties

Title: Doping rare earth ions Lu_2O_3 and LuAG phosphors, Preparation and Properties
　　Author: Zhang Liyan
　　Degree-granting units: Ningbo University
　　Keywords: Lu_2O_3;; LuAG;; oxalic acid;; ammonia;; solid-phase method;; liquid precipitation
　　Summary:
　　Different for different precipitation agents and lutetium oxide powder prepared by precipitation process studies, preparation of nitric acid dissolved oxygen of lutetium lutetium nitrate solution, respectively, the forward titration with oxalic acid, ammonia, Strong magnets ammonia forward and reverse titration are three ways to obtain precipitate precursor , and its DTA / TG ​​and XRD analysis, respectively, calcined at 600oC and 1200oC, the analysis found that the use of oxalic acid as a precipitant precipitate precursors prepared as C6Lu_2O_ (12) · 6H_2O, calcined by 600oC off after crystallization water, 1200oC complete conversion after calcination lutetium oxide, prepared by the coarse powder particles, mainly showing the length of the rod 6 ~ 10μm. Reverse titration using ammonia precursor in the preparation of the precipitate by calcination into 1200oC lutetium oxide, powder particles are spherical, uniform size, the average diameter of about 50nm. The same with ammonia as the precipitating agent, the use of forward titration prepared powder particle size and shape is not uniform, but also more serious agglomeration. In the powder absorption and fluorescence spectra were used to detect the 265nm and 300nm absorption peak and Eu ~ (3) the typical emission peak at 613nm and 626nm.
　　Lutetium oxide were used mixed with calcined alumina solid-phase method and lutetium nitrate mixed with sodium aluminate solution prepared by precipitation LuAG powder. By SEM and XRD analysis of the findings, were prepared by solid-phase particle size of coarse powder, a relatively sharp edges and corners, reunion serious and difficult to disperse, after calcined at 1200oC still a lot of lutetium oxide raw material for alumina and residual only a small amount http://www.chinamagnets.biz/ of solid phase reaction of raw materials lutetium aluminum garnet. The use of liquid-phase precipitation particles of powder were prepared by a more smooth, reunited after the powder is easily dispersed, after calcination in basically all by 1200oC into LuAG. Were prepared using liquid Eu ions doped LuAG powder existence 223 nm, 298 nm and 279 nm absorption shoulder. In the body of phosphor excitation 220nm was measured using the fluorescence emission spectrum found in the powder at 603 nm and 613 nm, there are two emission peaks, which indicates that the use of the process prepared LuAG: Eu powder in the presence Eu3 ions.
　　Degree Year: 2010