Preparation Of Yttria Doped With Rare Earth Ions And Research Of Luminescence Properties

Frequency upconversion （UC） from infrared to visible and ultraviolet （UV） bymaterials doped with trivalent rare-earth （RE） ions has attracted intensive attention.Cubic phase Y₂O₃has high stability and is excellent host lattice for up-anddownconversion luminescence. Tm³⁺and Ho³⁺is an excellent candidate forupconversion, since the4f electronic levels provide intermediate levels, whichclosely match one of the most attractive laser diode （LD） wavelength. Yb³⁺alsoexhibits a specifically large absorption cross-section under this wavelength （980nm）.In order to study the inpact of rare earth, metal ions doped and other factors onthe upconversion luminescence material, lanthanide doped yttria crystalline have beensynthesized. The morphology, size, photoluminescent properties and formationmechanism analysis of as-prepared products were discussed, and the main contentsare as follows:Cube-like Y₂O₃:Yb³⁺/Tm³⁺particles have been prepared via solvothermal routeusing carbon microspheres as template. The results show that the integrated intensityof visible emission depends on the uniform and well-dispersed morphology and theconcentration of Yb³⁺ions, which might have potential application in the fields ofadvanced flat panel displays and biological fluorescent labeling.Y₂O₃:Yb³⁺/Ho³⁺/Mg²⁺particles have been obtained by the hydrothermal method.The results demonstrated that the Mg²⁺doping in Y₂O₃:Yb³⁺/Ho³⁺phosphorsproduced remarkable enhancement of the UC luminescence, making this materials apromising candidate for photonic and biological applications.The eggshell structure Ag@Y₂O₃: Yb³⁺/Tm³⁺have been obtained by thehydrothermal method. This architecture allows for versatile control of the Y₂O₃:Yb,Tm-metal interaction through control of the carbon spacer thickness. Finally, thenanoparticles are potentially interesting as fluorescent labels, imaging experimentsor bioassays which require low background or tissue penetrating wavelengths.