Study On The Fluorescence Properties Of Rare Earth-Doped Fluorides Nanoparticles With Different Composition

Nanoparticles of NaMgF₃:Ce³⁺, BaLiF₃:Ce³⁺, BaYF₅:Ce³⁺ and BaF₂:Ce³⁺ were prepared from the quaternary microemulsions of CTAB, n-butanol, n-octane and water or brine solution. The X-ray diffraction (XRD) patterns were indexed to pure BaF₂, BaLiF₃, BaYF₅ and NaMgF₃ phases. The diameter of the particales, calculated with the help of Debye-Scherrer equation, revealed that these particales were nanoparticals. ESEM images showed the shape and diameter of BaF₂:Ce³⁺ nanoparticles. The spectrum of prepared nanoparticles was observed and discussed. Compared with their powder crystal prepared by high temperature solid reaction, the peaks of the fluorescent spectra changed.Nanoparticles of BaLiF₃:Er³⁺ were prepared from the quaternary microemulsions of CTAB, n-butanol, n-octane and water by hydrothermal method. The X-ray diffraction (XRD) patterns were indexed to a pure BaLiF₃ phase. The diameter of the particales was calculated by Debye-Scherrer equation, which was within the range of nanometer. Transmisson electron microscopy (TEM) images proved BaLiF₃:Er³⁺ (hydrothermally treating for 65 h) nanoparticles spherical. The fluorescence emission band of BaLiF₃:Er³⁺ nanoparticles peaked at 1540 nm (⁴I_13/2 →⁴I_15/2). The research showed that hydrothermal method was important in suppressing the appearance of BaF₂ impurity.