Preparation And Characterization Of Rare Earth Ions-Doped Rare Earth Oxide And Flouride Nanoribbons

Rare earth luminescence materials are widely used in the fields of lighting, display and detection. Rare earth oxides and rare earth fluorides are excellent matrixes for luminescent materials. Presently, research on preparation, composition, properties and applications of rare earth luminescent nanomaterials is one of the popular subjects in the field of rare earth luminescent materials. Electrospinning technology is a good way to prepare nanoribbons and has received much attention from scientists. Therefore, it will be an important and novel research subject to prepare rare earth ions-doped rare earth oxides and fluorides nanoribbons via electrospinning and to investigate their characteristics.In this dissertation, PVP/rare earth nitrates composite nanoribbons were prepared by electrospinning technique using PVP(Mr=90000) as template DMF as solvent and rare earth nitrates as starting materilal. The influences of experimental parameters on the formation of PVP/rare-earth nitrates nanoribbons were systematically discussed, and the optimum preparative conditions were acquired. Y₂O₃, Y₂O₃:Eu³⁺, Y₂O₃:Tb³⁺, Gd₂O₃, Gd₂O₃:Eu³⁺, Gd₂O₃:Tb³⁺ nanoribbons were obtained by calcination of the relevant PVP/rare-earth nitrates nanoribbons. For the first time, rare earth ions-doped rare earth oxides nanoribbons were fluorinated by way of gas-solid phase reaction using the combination of electrospinning and ammonium hydrogen fluoride fluorination method, and YF₃:Eu³⁺, YF₃:Tb³⁺, GdF₃:Eu³⁺, GdF₃:Tb³⁺ nanoribbons were successfully fabricated. The samples were systematically characterized by XRD, FESEM, TEM, FTIR, PL, etc. The results show that both the rare earth ions-doped rare earth oxides and fluorides nanoribbons possess excellent luminescent properties. Some significant results were obtained, and laid solid foundations for the future study of rare earth luminescent nanomaterials.