Hydrothermal synthesis and luminescent properties of : RE (RE=Eu, Tb)

Abstract: The powder has been hydrothermally synthesized from the double system. The effects of factors such as the ratio of initial reaction, pH value, reaction temperature and time were investigated. Moreover, the : RE (RE=Eu, Tb) phosphors were prepared by the hydrothermal method. Further, they were characterized by means of X-ray powder diffraction, scanning electron microscopy, thermogravimetric analysis, infrared spectroscopy and X-ray photoelectron spectroscopy. The luminescent properties were investigated by the luminescence spectrometer. The results show that the molar ratio and pH in the initial reaction mixture associated with the reaction temperature dominate the crystallization of the products. The products are air stable. XPS confirms the oxygen content of those products is very low. : RE obtained was pure phase of . It indicates that doping a low concentration of ions could not change the structure. In the co-doped and system, , and are observed in one matrix. These phenomena can be explained using an electron transfer theory. These RE ions occupy the sites of in . [Copyright &y& Elsevier]