Preparation and Luminescence Properties of Green Li4−3xSmx(MoO4)2 Phosphors

Abstract

A series of green Li4−3xSmx(MoO4)2 phosphors was prepared by a hydrothermal method. The morphology, structure and luminescence properties of the prepared powders were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and fluorescence (FL) spectroscopy. The effect of the Sm3+ content on the morphology and luminescence properties of the samples were analysed. All the microcrystalline samples were found to possess typical scheelite structures with tetragonal symmetry. This type of phosphor was effectively excited by blue light (450 nm) and emitted most strongly at 568 nm, i.e., green light with high brightness. With increasing x, the intensities of the two characteristic emission peaks of Sm3+ (at 568 nm and 664 nm) in the samples first increased, reaching a maximum at x = 0.6, and then decreased.