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

The image 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 image: 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. image: RE obtained was pure phase of image. It indicates that doping a low concentration of image ions could not change the structure. In the co-doped image and image system, image, image and image are observed in one matrix. These phenomena can be explained using an electron transfer theory. These RE ions occupy the sites of image in image.