Preparation And Characterization Of Rare-earth Ions Doped GdF₃and NaGdF₄Luminescent Nano-materials

Rare earth fluorides including REF3and AREF4(RE=rare earth;A=alkali) have been considered excellent host materials for luminescence materials owing to their diversity structural features,special physical and chemical characteristics.The properties of rare earth luminescent nano-materials largely depend on their structure, morphology and size.Therefore, the synthesis of luminescent nanomaterials with controlled morphology and size has also aroused a lot of concern from the scientists.In this thesis, rare earth fluorides GdF3and β-NaGdF4luminescence nanomaterials with diverse morphologies were synthesized with a facile arginine and C12H25OSO3Na(SDS)-assisted hydrothermal method. The structure and properties were characterized.(1) GdF3:Eu3+nanomaterials with diverse morphologies of nanoflowes、thin-nano-flakes、microrods and nanoflowers、submicroplates、hollow submicroplates、irregular-shaped nanoflowers were prepared by arginine-assisted hydrothermal method by conveniently adjusting two kinds of experimental parameters such as the F-sources(NH4F, NaF, NH4HF2) and pH(3,7,10) value of the liquor. The results showed that arginine, F-source, pH value have an important effect on the composition,crystal stuctures,shapes and size of the products. The emission intensities were different from samples with different shapes. Additionally, the luminescence properties of GdF3:Tb3+/Eu3+nanomaterials were investigated.and the multicolor luminescence features were realized.(2)(3-NaGdF4microtubes and microrods were prepared via arginine-assisted hydrothermal method by conveniently adjusting different molar radio between RE3+and F-source. With the increase of F-source, the shapes of the samples have been changed from microtubes into microrods.The formation mechanism of NaGdF4nanomaterials were discussed in detail. Tb3+/Eu3+-codoped and Tm3+/Tb3+/Eu3+-tridoped (3-NaGdF4nanorods were prepared by SDS-assisted hydrothermal method. Additionally, the luminescence properties of β-NaGdF4nanomaterials were investigated, and multicolor and white luminescence features had been successfully realized by doping different lanthanide ions into β-NaGdF4the host lattices.