Controllable Synthesis And Luminescence Properties Of Rare Earth Tungstate / Molybdate Luminescent Materials

The properties of nano-/micromaterials have a strong dependence on their size,shape,and dimensionality, and therefore the designing and controlling the morphology of nano-/micromaterials, understanding the complex growth mechanism and exploring the intrinsic fundamentals are the focuses of inorganic chemistry and materials science. In this paper, the research is focused on a series of rare earth activator ions doped BaWO₄,NaGd（MoO₄）₂ nano/micromaterials, and studied the mechanism of its formation and spectral properties.Uniform and well-dispersed BaWO₄:Ln₃+（Ln = Tb, Eu, Dy） luminescent material have been successfully synthesized through a hydrothermal process by using trisodium citrate as surfactant. The structure, morphology, and luminescence properties of the as-obtained Ba WO4 samples were studied, and a detailed description of the growth mechanism was proposed.XRD results showed that the BaWO₄:Ln³⁺ sample coincided with scheelite structure BaWO₄.From SEM and TEM analysis, it can be seen that the sample is composed of uniform and well-dispersed ellipsoidal particles. In addition, the synthesis method may provide valuable advice for the synthesis of other tungsten/molybdate functional materials.Uniform and well-dispersed of spherical and shuttle-like BaWO₄ materials have been successfully synthesized through a hydrothermal process by using trisodium citrate and SDBS as surfactant. A series of BaWO4 crystal materials with different morphologies were obtained by simply adjusting the p H values of the initial solution. XRD results showed that the crystallinity of each sample was perfect. SEM analysis indicated that the sample is good dispersion of micro- nano structures. The as-synthesized luminescent materials may find potential applications in luminescence, displays and biomedical field.A simple approach was developed to fabricate NaGd（MoO₄）₂:Ln³⁺（Ln=Eu, Tb, Dy, Sm）hierarchical architectures with a series of different sizes and morphologies at ambient pressure and room temperature without any catalysts, templates, or substrates. Under UV light excitation, the Na NaGd（MoO₄）₂:Ln³⁺ samples exhibited intense characteristic emissions of rareearth activators. The synthesis method is simple, low cost, and environmentally-friendly, and the as-obtained luminescent materials are expected to be applied on the fluorescent displays and LEDs.