Sc-based nanomaterials have attracted considerable attention due to their unique optical properties different from those of Ln/Y-based nanomaterials.However,studies on Sc-based nanomaterials are far from comprehensive...Sc-based nanomaterials have attracted considerable attention due to their unique optical properties different from those of Ln/Y-based nanomaterials.However,studies on Sc-based nanomaterials are far from comprehensive.Particularly,nanoscale alkaline(Ca,Sr and Ba)scandium fluorides were almost ignored for their stringent synthetic conditions.Herein,we synthesize high-quality tetragonal phase Ba_(3)Sc_(2)F_(12) nanocrystals with uniform morphology and good dispersibility by carefully tailoring the reaction conditions,such as the molar ratio of reactants,temperature and reaction time.Then,the upconversion(UC)luminescence property of Ba_(3)Sc_(2)F_(12):Yb/Er(Ho)samples is investigated in detail.The doping concentrations of sensitizer(Yb^(3+))and activator(Er^(3+)and Ho^(3+))are optimized for the strongest UC luminescence,of which the corresponding energy transfer processes are also discussed.Moreover,tetragonal Ba_(3)Sc_(2)F_(12) nanocrystals can gradually transform into hexagonal Ba_(4)Yb_(3)F_(17) nanocrystals with the increase in Yb^(3+)doping content.This work provides a novel type of Sc-based nanomaterials with strong red UC emissions which are promising in high-resolution 3-dimensional color displays,laser,bioimaging and biolabels.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.11904323,11874328 and 211902148)the Certificate of Postdoctoral Research Grant in Henan Province(No.1902014)。
文摘Sc-based nanomaterials have attracted considerable attention due to their unique optical properties different from those of Ln/Y-based nanomaterials.However,studies on Sc-based nanomaterials are far from comprehensive.Particularly,nanoscale alkaline(Ca,Sr and Ba)scandium fluorides were almost ignored for their stringent synthetic conditions.Herein,we synthesize high-quality tetragonal phase Ba_(3)Sc_(2)F_(12) nanocrystals with uniform morphology and good dispersibility by carefully tailoring the reaction conditions,such as the molar ratio of reactants,temperature and reaction time.Then,the upconversion(UC)luminescence property of Ba_(3)Sc_(2)F_(12):Yb/Er(Ho)samples is investigated in detail.The doping concentrations of sensitizer(Yb^(3+))and activator(Er^(3+)and Ho^(3+))are optimized for the strongest UC luminescence,of which the corresponding energy transfer processes are also discussed.Moreover,tetragonal Ba_(3)Sc_(2)F_(12) nanocrystals can gradually transform into hexagonal Ba_(4)Yb_(3)F_(17) nanocrystals with the increase in Yb^(3+)doping content.This work provides a novel type of Sc-based nanomaterials with strong red UC emissions which are promising in high-resolution 3-dimensional color displays,laser,bioimaging and biolabels.
