Synthesis And Luminescence Of Rare Earth-doped Fluorides Low-dimensional Nanomaterials

Alkaline earth metal fluoride is one kind of an important luminescent host material, and they can exhibit efficient luminescence via doping with different rare earth activators. Nowadays, alkaline earth metal fluoride nanomaterials with various morphologies including nanoparticles, nanorods have been synthesized via micro-emulsion method, hydrothermal method and sol-gel method. There have been no reports on the alkaline earth metal fluoride nanofibers and nanobelts. Electro spinning has been proved to be one of the best methods to fabricate low-dimensional nanomaterials owing to its simple operation, high efficiency and reproducibility. Hence, fabrication of rare earth cations-doped alkaline earth metal fluoride luminescent nanofibers and nanobelts via electrospinning remain an important and challenging subject of study.In this dissertation, CaF2, CaF2:RE3+(RE=Eu,Tb), NaMgF3:RE3+(RE=Eu,Tb), CeO2and CeO2:Eu3+nanofibers and nanobelts were fabricated via electrospinning technique combined with double-crucible method. The luminescent properties of these nanomaterials were studied systematically.The samples were characterized by X-ray diffractometry (XRD), scanning electron microscope (SEM) and fluorescence spectroscope. The results show that the CaF2and CaF2:RE3+(RE=Eu,Tb) nanomaterials were the cubic phase in structure. The diameter of nanofibers was140-150nm, the width of nanobelts was2-14μm, and the thickness was90-200nm. The NaMgF3and NaMgF3:RE3+(RE=Eu,Tb) nanomaterials were the orthorhombic phase in structure. The diameter of nanofibers was90-150nm, the width of nanobelts was2μm, and the thickness was180nm. The CeO2and CeO2:Eu3+nanomaterials were the cubic phase in structure. The diameter of nanofibers was292nm, the width of nanobelts was3.78μm, and the thickness was111nm. The fluorescent spectra results show that rare earth cations-doped alkaline earth metal fluoride nanomaterials are very good fluorescent nanomaterials. These findings lay solid foundations for the future study of luminescence of rare earth ions-doped alkaline earth metal fluoride low-dimensional nanomaterials.