Selective And Controlled Synthesis Of Multiform Morphologies Y₂O₃:Eu³⁺ Micro/Nano Materials And Luminescence Properties

In this paper, our experimentations were made up of two parts. The first part,size-tunable Y₂O₃:Eu³⁺flower aggregates constructed from nanotubes were obtainedthrough rolling up Y（OH）CO₃：Eu³⁺nanosheets under template-free hydrothermalconditions at200℃for2h, followed by an annealing process. Y（CH₃COO）₃and Eu（CH₃COO）₃was used as a raw material for the preparation of Y（OH）CO₃precursorsthrough urea precipitation. The absorbed CH3COO_ions play an important role in theformation of nanosheets structures and PEG keeps the precursors monodisperse anduniform. Through decreasing the concentration of Y（CH₃COO）₃, smaller Y（OH）CO₃：Eu³⁺flower assemblies of fewer nanotubes and homogeneously separatedY（OH）CO₃：Eu³⁺nanotubes with the length of～150nm and the diameter of～25nm and monodisperse～30nm Y（OH）CO₃nanospheres, respectively, were alsoselectively prepared. After calcination at600℃for2h, the Y（OH）CO₃weredecomposed into Y₂O₃and the tubular structures were maintained. Under UVexcitation, Y₂O₃:0.05Eu³⁺flower-like and spherical samples show strong red emission,corresponding to the characteristic lines of Eu³⁺.The second part, Uniform Y₂O₃:Eu³⁺nanorods and nanosheets were controllablysynthesized via NaOH as precipitation. Then, the nanosheets and nanorods wereobtained via a facile hydrothermal synthetic method using yttrium chloride andyttrium acetate as the yttrium source. During these experiments NaOH were used asprecipitators and added in correct order. We also studied the spectroscopic propertiesof Y₂O₃:Eu³⁺phosphor. The Eu³⁺ion mainly shows its characteristic red （611nm,5D0â†'7F2） emissions in both kinds of morphologies Y₂O₃:Eu³⁺phosphor, but emissionintensity are different. It can be explain from the viewpoint of their differentabsorption properties.X-ray diffraction, transmission electron microscopy, fluorescence spectro-photometer and FESEM have been employed to characterize the as-prepared Yttriu...