Controlling synthesis and host sensitized Eu super(3+) emissions of K sub(5)Gd sub(9)F sub(32) and GdF sub(3)

By controlling the reactant ratios, hydrothermal time, hydrothermal temperatures, pH values of the prepared solutions, and the concentrations of K sub(3)C sub(6)H sub(5)O sub(7).2H sub(2)O, 1 mol% Eu super(3+) doped cubic phase of K sub(5)Gd sub(9)F sub(32) and/or orthorhombic phase of GdF sub(3) micro/ nanocrystals have been synthesized based on a hydrothermal method. For comparison, the sample was also synthesized by a co-precipitation method. The samples were characterized by X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FE-SEM) images, energy-dispersive spectroscopy (EDS) spectra, and photoluminescence (PL) excitation and emission spectra. By host Gd super(3+) sensitizing, the Eu super(3+) presents relatively strong emissions. The energy transfers from host Gd super(3+) to doping Eu super(3+) are observed in all the samples and the energy transfer plays an important role in the emission of Eu super(3+). Acting as a probe, the Eu super(3+) presents its distinct optical properties in the samples.