Preparation And Study Of Upconverting Luminescent Materials Based On SrF 2 And SrAlF 5

The up-converting luminescent material is a luminescent material that emits short wavelengths under excitation of long wavelengths.Most of them belong to rare earth doped inorganic materials,such as Yb³⁺/Er³⁺co-doped Y₂O₃,NaYF₄,etc.The up-converting luminescent material can emit different colors of visible light under the excitation of infrared light.Rare earth ion-doped upconversion luminescent materials have a wide range of applications in three-dimensional display,optical data storage,medical diagnostics,sensors,lasers,and optical amplifiers,and have been widely studied in the past decades.In this dissertation,SrF₂ up-conversion luminescent materials doped with Yb³⁺/Er³⁺,Yb³⁺/Tm³⁺and Tm³⁺/Er³⁺/Yb³⁺were prepared by high-temperature solid-state method,and Mn⁴⁺/Er³⁺co-doped SrAlF₅ phosphors were prepared by co-precipitation method.They systematically discussed and analyzed their up-conversion luminescence characteristics and applications.The details are as follows:Yb³⁺/Er³⁺double doped SrF₂ strong green light upconverting phosphor prepared by high temperature solid-state reaction method,Yb³⁺/Tm³⁺double doped SrF₂ strong blue light upconverting phosphor,and Tm³⁺/Er³⁺/Yb³⁺triple doped SrF₂ The strong white light upconverts the observations of the phosphor.The luminescence properties of SrF₂:Yb³⁺,Er³⁺and Tm³⁺under 980 nm excitation were studied in detail.The NIR excitation temperature sensing characteristics based on green up-conversion emission from Er³⁺were deliberately studied over a wide temperature range.In addition,by monitoring the internal heat at 980 nm laser pump power,potential applications of the prepared sample in optical heating were also investigated.A series of Mn⁴⁺/Er³⁺co-doped SrAl F₅ phosphors were prepared by coprecipitation.The 705 nm upconversion emission of Er³⁺sensitized Mn⁴⁺was obtained for the first time under 980 nm laser excitation.In addition,the mutual energy transfer mechanism between Mn⁴⁺and Er³⁺ions was studied in detail.