Spectra Of Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺-Codoped Oxyfuoride Glass

With the in-depth study of upconversion luminescence,there has been a rare-earth ions doped oxyfluoride upconversion luminescence glass in recent years.It combines the low phonon energy of fluoride glass's optical properties with the good physical and chemical stability and high mechanical strength of oxide glass,and can be precipitated by controlled crystallization of fluoride crystal phase.Because of the low phonon energy of fluoride crystal phase,the rare-earth ions concentrate in the fluoride crystal phase,which can greatly enhance the upconversion luminescence of rare-earth ions efficiency.Therefore,the fluoride-oxide luminescent glasses are expected to become highly promising rare-earth doped luminescent materials,and were widely used in optical communication,up-conversion laser,three-dimensional display and data storage areas.Concerning the requirements of effective environmental protection and low cost,a series of Yb³⁺,Er³⁺,Tm³⁺,Ho³⁺ ions double,triple and quadruple doped oxyfluoride glass were prepared by using the cheaper alkaline-earth fluoride(BaF₂) and rare earth oxides(Yb₂O₃, Er₂O₃,Tm₂O₃,Ho₂O₃) as raw materials.The luminescence properties of these rare-earth ions in the host glasses were studied.The blue,green and red upconversion luminescence were obtained in the Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺co-doped oxyfluoride glass under the 980nm laser excitation.With the growth of the Er³⁺ ion concentration,the red,blue and green up-conversion luminescence intensity decrease.With the growth of the Ho³⁺ ion concentration,the blue up-conversion luminescence intensity decrease sharply,the green decrease slowly,while the red change little.With the growth of the Tm³⁺ ions concentration, the red and green up-conversion luminescence intensity decrease,while the blue up-conversion luminescence intensity increased firstly and then decreased,mainly due to cross-relaxation and reverse energy transfer of rare earth ions.When the Er³⁺ ion doped amount of 0.5%,Ho³⁺ ion doping amount of 0.3%,Tm³⁺ ion doping amount of 0.1%,the Yb³⁺/Er³⁺/Ho³⁺/Tm³⁺co-doped oxyfluoride glass can emit the white light.