Synthesis And Research On The Luminescent Properties Of Rare-Earth Doped Fluoride Nanoparticles

Rare earth doped fluoride nanoparticles have a numerous novel properties for rare earth ions’unique electronic state levels. Rare-earth ions doped fluoride nanoparticles are being investigated for a wide range of potential applications, such as lighting, display, optoelectronics devices, data storage, biolabels and extending to other developing technology fields.In this paper, small-sized and regular shaped rare earth doped fluoride nanoparticles were synthesized for biological imaging and bio-labels applications. The hydrothermal method were used to synthesize CaF2:Yb3+xEr3+y, BaF2:Yb3+xEr3+y and SrF2:Yb3+xEr3+y nanoparticles, the crystal structure, shape, and upconversion emission spectra of the samples were characterized.The main conclusions of the paper are as follow:(1). CaF2:Yb3+xEr3+y nanoparticles were synthesized by the hydrothermal method. The XRD and TEM results demonstrated that CaF2:Yb3+xEr3+y nanoparticles with an average size of～12nm. The effects of Yb3+and Er3+concentration on the upconversion luminescence of the CaF2:Yb3+xEr3+y nanoparticles were found that the best concentration of the sensitizer Yb3+was at20%and the activator Er3+was at6%.The upconversion emission spectra of the CaF2:Yb3+x Er3+y nanoparticles result show that green and red upconversion emissions are corresponding to the transition2H11/2â†'4I15/2,4S3/2â†'4I15/2and4F9/2â†'4I15/2of Er3+.(2). SrF2:Yb3+xEr3+y nanoparticles were synthesized by the hydrothermal method. The XRD and TEM results show that SrF2:Yb3+xEr3+y nanoparticles with an average size of～14nm. The effects of Yb3+and Er3+concentration on the upconversion luminescence of the SrF2:Yb3+xEr3+y nanoparticles were found that the best concentration’of the sensitizer Yb3+was at10%and the activator Er3+was at5%. The upconversion emission spectra of the SrF2:Yb3+xEr3+y nanoparticles under980nm diode laser excitation result show that the green and red upconversion emissions are corresponding to the transition2H11/2â†'>4I15/2,4S3/2â†'4I15/2and4F9/2â†'4I15/2of Er3+.(3). BaF2:Yb3+xEr3+y nanoparticles were synthesized by the hydrothermal method. The XRD and TEM results show that SrF2:Yb3+xEr3+y nanoparticles with an average size of～17nm. The effects of Yb3+and Er3+concentration on the upconversion luminescence of the SrF2:Yb3+xEr3+y nanoparticles were found that the best concentration of the sensitizer Yb3+was at10%and the activator Er3+was at5%. The upconversion emission spectra of the SrF2:Yb3+xEr3+y nanoparticles under980nm diode laser excitation result show that the green and red upconversion emissions are corresponding to the transition2H11/2â†'>4I15/2,4S3/2â†'>4I15/2and4F9/2â†'4I15/2of Er3+.