title: Controllable synthesis and luminescent properties of three-dimensional nanostructured CaWO4:Tb3+ microspheres.
abstract: Three-dimensional (3D) nanostructured CaWO(4):Tb(3+)microspheres assembled by submicrospindles were synthesized via a mild sonochemical route from an aqueous solution of CaCl(2), TbCl(3) and Na(2)WO(4) with the aid of surfactant Polyglycol 600 (PEG-600). The crystal structure and morphology of the as-prepared products were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Rietveld refinement was carried out on the XRD data. The results showed that the CaWO(4):Tb(3+)nanoparticles can be formed without ultrasonic irradiation or addition of PEG-600. With continuously increasing irradiation time the submicrospindles and microspheres could be self-assembled. The central diameter and length of the submicrospindles are around 190 and 500 nm, respectively. The 3D CaWO(4):Tb(3+)nanostructured microspheres with diameter of 2-4 μm were assembled by the submicrospindles. A possible formation mechanism for the 3D-structured CaWO(4):Tb(3+)microspheres was proposed. The Photoluminescent (PL) properties of Tb(3+) ions in the nanostructured CaWO(4) microspheres were studied. The energy transfer processes in CaWO(4):Tb(3+)microspheres were analyzed. The electric dipole-dipole energy transfers related to (5)D(3) level were studied by inspecting the fluorescence decay of (5)D(3) level. The energy transfer critical distance was estimated.
authors.affiliation: Department of Physics, Dalian Maritime University, Dalian, Liaoning 116026, PR China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Tian
authors.forename: Baojiu
authors.initials: B
authors.lastname: Chen
authors.forename: Hongquan
authors.initials: H
authors.lastname: Yu
authors.forename: Ruinian
authors.initials: R
authors.lastname: Hua
authors.forename: Xiangping
authors.initials: X
authors.lastname: Li
authors.forename: Jiashi
authors.initials: J
authors.lastname: Sun
authors.forename: Lihong
authors.initials: L
authors.lastname: Cheng
authors.forename: Haiyang
authors.initials: H
authors.lastname: Zhong
authors.forename: Jinsu
authors.initials: J
authors.lastname: Zhang
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Zheng
authors.forename: Tingting
authors.initials: T
authors.lastname: Yu
authors.forename: Libo
authors.initials: L
authors.lastname: Huang