Upconversion Luminescence Properties of Yb³⁺/Er³⁺/Tm³⁺ Tridoped YF₃

A series of YF₃:Yb³⁺/Er³⁺/Tm³⁺ upconversion materials were synthesized via the chemical coprecipitation method based on yttrium fluoride (YF₃).The phase structure,sintering temperature and luminescence properties of the as-prepared products were characterized by XRD,DTA and the fluorescence spectrum analysis.The results showed that the crystal structure of YF₃ didn't change after tridoping Yb³⁺/Er³⁺/Tm³⁺.The luminescence phenomenon of multiple bands appeared under the 980 nm near-infrared excitation.Different doping amounts of Yb³⁺,Er³⁺,Tm³⁺ correspond to different luminescence laws.The upconversion mechanism was also discussed,and the optimum sintering temperature of the phosphors was determined.