Liyong Wang

Synthesis and enhanced luminescence of uniform and well-dispersed quasispherical YVO4:Ln3+ (Ln = Eu, Dy) nanoparticles by a solvothermal method

Uniform and well-dispersed quasi-spherical YVO4:Ln3+ (Ln = Eu, Dy) nanoparticles have been successfully synthesized through a solvothermal approach using EG and PVP as solvent and surfactant, respectively. SEM and TEM images indicate that the as-obtained quasispheres are composed of tiny packed nanocrystallites. The YVO4:Eu3+ and YVO4:Dy3+ samples show strong red and yellow light emissions under ultraviolet excitation. The luminescence intensities of the phosphors are greatly enhanced by co-doping Ba2+ ions into the YVO4 host lattice. Nitrogen adsorption–desorption measurements reveals that the as-synthesized luminescent quasi-spherical nanoparticles have a porous structure, which might find potential applications in the fields of luminescence, drug delivery, and disease therapy.

Preparation of Lanthanide Ions-Doped BiPO4 Nanoparticles and Fe3+ Ions Assay

A facile method for the synthesis of a Ln3+ (Eu, Tb) doped BiPO4 (BPO) nanocrystals were developed using an environment-friendly low temperature hydrothermal method assisting with phenol formaldehyde resin (PFr). Structure and surface functional groups of BPO samples were characterized by XRD and IR patterns. Morphology was studied by SEM technology also. Furthermore, doped BPO display strong red and green emissions from Eu3+ and Tb3+ ions respectively, and the BPO suspension is selectively quenched upon addition Fe3+ ions, and there is barely any interference by other metal ions, thus making the nanocrystals as a potential Fe3+ ions Fluorescent Probe, and the detection limit is below micromole level.

Lanthanide ions-doped SrMoO4 microcrystals: Synthesis, characterizations, luminescence, and detection of Fe3+ ions

A facile and green synthetic method for the synthesis of a Ln3+(Eu, Tb)-doped SrMoO4 (SMO) microcrystals were developed using an environment-friendly low temperature hydrothermal method assisting with phenol formaldehyde resin (PFr). The microcrystals show narrow distribution and uniform particle size, and strong red and green emissions from Eu3+ and Tb3+ ions, and it is selectively quenched upon addition Fe3+ ions, thus making the microcrystals as a potential Fe3+ ions sensing material, and the detection limit is nearly micromole level.

Solid-state reaction synthesis for mixed-phase Eu3+-doped bismuth molybdate and its luminescence properties

A method for mixed-phase bismuth molybdate doped with Eu3+ ions was developed by solid-state reaction assisting with polyvinyl alcohol (PVA). The results of powder X-ray diffraction showed a mixed-phase structure and the microscopical characterization technology revealed the formation process with the addition of PVA. As a structure inducer, the PVA molecules played a vital role in the formation of phase structure. The as-obtained Eu3+-doped bismuth molybdates were also characterized by using different spectroscopic techniques including FTIR and photoluminescence (PL). The results show that doping concentration, PVA addition and calcination temperature affect photoluminescence properties remarkably.

Hydrothermal synthesis of micrometer doping CaWO4 phosphors assisted by polymerization

CaWO4 crystals were prepared by hydrothermal method assisting with phenol-formaldehyde polymer. The morphology can be controlled by polymer, and X-ray diffraction patterns results present a scheelite-type tetragonal structure, characteristic infrared active modes for O–W–O in the range from 500 cm−1 to 4000 cm−1 by Fourier transform infrared spectroscopic techniques. Raman results indicate that the crystals possess seven Raman active modes in the range from 100 cm−1 to 1000 cm−1. A scanning electron microscopy study reveals that the particles exhibit uniform morphology. Luminescent properties were investigated by photoluminescence measurements, multicolor phosphors were obtained when Ca2+ was substituted partly by lanthanide ions.