Influence of S/La Molar Ratio on the Morphology and Optical Property of La_2S_3 Microcrystalline Prepared by Microwave Hydrothermal

摘要

The La_2S_3 microcrystalline was prepared by microwave hydrothermal method (M-H). The influences of S/La molar ratio on the phase composition, and morphology of the La_2S_3 microcrystalline were particularly investigated. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet and visible spectroscopy (UV-vis) and photoluminescence spectroscopy (PL) at room temperature. With the decrease of S/La molar ratio from 6/3 to 6/6, crystallization of the obtained microcrystalline is improved. The morphology of prepared La_2S_3 transforms from irregular shapes to quasi-sphere structure. The as-prepared microcrystalline shows excellent absorbency of ultraviolet light and are almost transparent to visible light to exhibit stable violet-blue photoluminescence properties under the ultraviolet light excitation at room temperature.