Controllable Synthesis And Luminescence Properties Of Rare Earth Oxide And Fluoride Nanostructure

The CeYbxOy and LaxY1-xF3 nanostructure have been fabricated in the nanopores arrays of AAO template with the suction filtering at subatmospheric pressure, and the NaYF4 nanometer powder has been fabricated by hydrothermal in the solvent of water and ethylene glycol. The morphology, crystal structure, chemical composition and luminescence properties of the CeYbxOy and LaxY1-xF3 nanostructure have been investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM),X-ray diffraction(XRD), energy dispersive spectra(EDS). The fluorescence spectrophotometer (F-4500) was used to study the luminescence intensity for CeYbxOy:Eu3+ and LaxY1-xF3:Eu3+, respectively. The results indicated that the fluorescence intensity of CeYbxOy:Eu3+and LaxY1-xF3:Eu3+ are related to the excitation wavelength and the doping concentration of Eu.The main research results are as follows:1. The fluorescence intensity of CeYbxOy:Eu3+nanowire arrays were influenced by the doping concentation of Eu. The result shown that CeYbxOy:Eu3+ nanowire arrays exhibit a strong emission peak at 593nm with excitation wavelength 394 nm, corresponding to the transition of 5D0-7F1 of Eu3+, and the optimum doping concentration of Eu3+ in mole ratio is 8%.2. There are two emission peaks at 593nm and 711 nm for the LaxY1-xF3:Eu3+ nanotube arrays, LaxY1-xF3:Eu3+ nanowire arrays and LaxY1-xF3:Eu3+ nanometer powder, corresponding to the transition 5D0-7F1 and 5D0→7F4 of Eu3+, respectively. The fluorescence intensity of LaxY1-xF3:Eu3+ nanotube is the maximum and the LaxY1-xF3:Eu3+ nanometer powder is the minimum among these nanostructures with the same doping concentration of Eu3+ in mole ratio, and the optimum doping concentration of Eu3+ in mole ratio is 6%.3. The morphology, structure and the nanometer sized of NaYF4 were related to the factors, such as, the solvent, the surfactant, the complexant and the reactant concentration etc. Controlling the reaction conditions, the cubic NaYF4 nanocrystals can be synthesized.