LAUSR

ABSTRACT LaAlO3 powders are prepared by coprecipitation of La(OH)3 and Al(OH)3, followed by solid state reaction method or molten salt synthesis method. The crysatlline phase evolution, micro morphology and luminescence properties of the calcined products are systematically studied by XRD, SEM/EDX and fluorescence spectroscopy. The results show that LaAlO3 powders with high purity could be obtained at 1000°C/3h with the help of melton salt Na2SO4, however, impurities exist in the solid state reaction products under the same calcination condition. The as prepared sub-micrometer LaAlO3 powders doped with Eu3+ ion by the molten salt method show two dominant emmision peaks of 596nm and 618nm under excitation of near ultraviolet light (314nm), both emmision peak intensity reach maximum at the Eu3+ doping concentration of x = 0.08. At higher Eu3+ doping concentration, the emmision peak intensity decreases due to the concentration quenching.