Controllable Synthesis Of Rare Earths Doped Nano And Micro-Fluorides And Study On Fluorescent Spectra

A simple hydrothermal route has been used to synthesize YF₃ hexagonal microplates, solid peanut-like,cauliflower-like and octahedron structures of orthorhombic YF₃ by using oleic acid(C₁₈H₃₄O₂) and CTAB as the chelating agent and shape modifier.The as-synthesized products were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),environmental scanning electron microscopy(ESEM).The formation mechanism of the product based on the experimental results is discussed.A series of parallel experiments on the photoluminescence of YF₃:Eu³⁺ and YF₃:Ce³⁺ were prepared to aim at discussing the influence of doping concentration,surface topography,Y/F,chelating agent and reaction temperature.The results showed as followed: the optimal doping concentration is respectively 4%and 2%;the sample with the morphology of hexagonal microplates have an optical photoluminescence;compared with orthorhombic crystal phase,there is a red shift about 26nm in the fluorescent spectra of cubic phase;the optimum reaction temperature of YF₃:Eu³⁺ and YF₃:Ce³⁺ is 180℃and 140℃,respectively.