The Research On Preparation And Luminescence Properties Of Rare-earth Doped Oxyfluoride Tellurite Glass-ceramic

In this paper, Yb3+/Ho3+co-doped CaF2containing and BaF2containing transparentfluoride oxide tellurite glass were prepared by using a conventional melt-quenchingmethod, then transparent oxyfluoride tellurite glass-ceramic Containing CaF2Nanocrystalsand transparent oxyfluoride tellurite glass-ceramic Containing BaF2Nanocrystals weresuccessfully prepared by crystallization behaviors.After crystallization treatment, the particle diameter around47nm and51nm,granular CaF2nanocrystals and BaF2nanocrystals were precipitated in the precursor glass.The optical transmittance of transparent oxyfluoride tellurite glass and glass-ceramiccontaining CaF2composition in the visible-near-infrared wavelengths were40%~68%and21%~40%respectively, The optical transmittance of transparent oxyfluoride tellurite glassand glass-ceramic containing BaF2composition in the visible-near-infrared wavelengthswere15%~40%and13%~25%respectively.Under980nm excited, The Yb3+/Ho3+co-doped transparent oxyfluoride telluriteglass-ceramic containing CaF2nanocrystals and its precursor glass were implementedup-conversion luminous, they had the green light （530~560nm） and red light（630~670nm） two emission bands, the fluorescence intensity firstly increased and thendecreased with Ho3+ions concentration increasing, Maximum fluorescence intensityreaches when the concentration is of1.5mol%.Under980nm excited, The Yb3+/Ho3+co-doped transparent oxyfluoride telluriteglass-ceramic containing BaF2nanocrystals and its precursor glass were implementedup-conversion luminous, they had the green light （530~560nm） and red light（630~670nm） two emission bands too, the fluorescence intensity firstly increased andthen decreased with Ho3+ions concentration increasing, Maximum fluorescence intensityreaches when the concentration between0.5mol%~1.0mol%. The energy transfer processesare that:green-light（546nm）: Yb3+:2F5/2+Ho3+:5I8→Yb3+:2F7/2+Ho3+:5I6:Yb3+:2F5/2+Ho3+:5I6→Yb3+:2F7/2+Ho3+:（5S2+5F4）Ho3+:（5S2+5F4）→Ho3+:5I8red-light（654nm）:Ho3+:（5S2+5F4）→Ho3+:5F5Ho3+:5F5→Ho3+:5I8Or Yb3+:2F5/2+Ho3+:5I8→Yb3+:2F7/2+Ho3+:5I6Ho3+:5I6→Ho3+:5I7Yb3+:2F5/2+Ho3+:5I7→Yb3+:2F7/2+Ho3+:5F5Ho3+:5F5→Ho3+:5I8...