Preparation Of Ce³⁺ Doped Complex Fluorides And Research Of Fluorecence Properties

Complex fluorides KLaF₄, KCeF₄ were synthesized by co-precipitation method and KYF₄, BaLaF₅, BaCeF₅, BaYF₅ were synthesized by hydrothermal method. The influence of different reaction conditions such as reactants, ratio of reactants, reaction time and temperature were investigated in the paper.The structure, particle size and element type of samples were analysized by means of X-ray powder diffraction, transmission electron microscope and X-ray energy spectrometer technology. It is found that co-precipitation and hydrothermal method under appropriate conditions can synthesize complex fluorides with singlephase structure. Compared with others, the two methods have many advantages such as simple process, no corrosion equipment, the production of crystal phase directly without sintering. Thus they have a broad application prospect.Kinds of cerium ions doped fluoride compounds(KLaF₄: Ce³⁺, KYF₄: Ce³⁺, BaLa F₅: Ce³⁺, BaYF₅: Ce³⁺) were synthesized by co-precipitation and hydrothermal method respectively. The location and relative intensity of diffraction peaks of doped fluorides are consistent with undoped substrates and no other impurity peaks are found in their XRD spectra, which indicate the products have a single crystal structure. A small amount of rare earth ions doped don't change the crystal structure of complex fluorides significantly.Through the analysis of fluorescence spectra of KLaF₄: Ce³⁺, KYF₄: Ce³⁺, BaLa F₅: Ce³⁺, BaYF₅: Ce³⁺, the results are found as follows. The emission peak of KLaF₄: Ce³⁺ is from 300 nm to 500 nm in its emission spectrum with the largest peak located at 355 nm. The emission peak of KYF₄: Ce³⁺ is from 300 nm to 500 nm in its emission spectrum with the largest peak located at 340 nm. The emission peak of BaLa F₅: Ce³⁺ is from 320 nm to 420 in its emission spectrum with the largest peak located at 352 nm and the emission peak of BaYF₅: Ce³⁺ is from 290 nm to 450 nm in its emission spectrum with the largest peak located at 336 nm. These emission peaks belong to the 5d?4f transition of cerium ions. The complex fluorides KLaF₄, KYF₄, BaLa F₅ and BaYF₅ can be used as superior substrates of fluorescent materials from the above discussion results.