Electrospinning preparation and properties of NaGdF4:Eu3+ nanowires

Eu3+ doped NaGdF4 (NaGdF4:Eu3+) nanocrystals in hexagonal crystal phase were prepared by a polyol method, and the size and morphology controllable NaGdF4:Eu3+/PVP nano-composite fibers were obtained through the electrospinning technique, and then the NaGdF4:Eu3+ nanowires were obtained by followed annealing. By changing the ratio of PVP to NaGdF4 as well as the calcination temperature, the optimal conditions for synthesizing the NaGdF4 nanowires were obtained, and the structural properties of the synthesized sample were characterized by powder X-ray diffraction (XRD) patterns and field emission scanning electron micrographs (SEM) images. The luminescent properties of the NaGdF4:Eu3+ nanocrystals and nanowires were also studied in this paper. We observed that the luminescent intensity of NaGdF4:Eu3+ nanowires was greatly increased compared to the annealed NaGdF4:Eu3+ nanocrystals at the same temperature.

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