The Preparation And Properties Of Sn²⁺-Dy³⁺ Co-Doped Fluorophosphate Glasses

At present,ion-doped white glass has been widely used in lighting,optical communication,optical amplifier and optical waveguide.Among them,the fluoride phosphate glass with high transmittance,low phonon energy and low melting temperature,at the same time with excellent optical performance,stable physical and chemical properties and good nature of rare earth ions dissolved,cause the extensive concern of the researchers.A series of Sn²⁺?Dy³⁺single doping and Sn²⁺-Dy³⁺co-doped fluorophosphate glass?FPGs?for white light emitting phosphor have been prepared by the melt quenching method.According to through spectrum,excitation spectrum,emission spectrum and fluorescence test results,such as service life of FPG:Sn²⁺?FPG:Dy³⁺and FPG:Sn²⁺-Dy³⁺glass optical properties of fluorescence analysis and research,to obtain superior physicochemical properties and spectral characteristics of phosphor white glass.The research contents and results are as follows:1.Based on the excellent properties of fluorophosphate glass,the FPG:Sn²⁺?FPG:Dy³⁺glass fluorescence was prepared by using Sn²⁺and Dy³⁺ions respectively.The effects of Sn²⁺different doping concentrations on FPG:Sn²⁺glass luminescence properties and the effects of different excitation wavelengths on FPG:Dy³⁺glass luminescence intensity were studied.Under ultraviolet excitation,the efficient blue and yellow light emission was obtained for Sn²⁺and Dy³⁺monofluorinated phosphate glass respectively.In addition,for all kinds of glass samples of DSC,thermal conductivity and other optical properties were tested and calculated,the thermal conductivity of the sample is obtained,quantum efficiency,color coordinate,color rendering index and other performance parameters.2.Combining the excellent properties of Sn²⁺and Dy³⁺,A series of Sn²⁺-Dy³⁺co-doped fluorophosphate glasses?FPGs?for emitting white light phosphor have been prepared by the melt quenching method.Under the 280 nm UV light excitation,the emission color of FPGs can be tuned from blue to white color by properly adjusting the concentration of Dy³⁺ions,which can be attributed to the energy transfer from Sn²⁺to Dy³⁺.The energy transfer mechanism was investigated and analyzed according to the photoluminescence,lifetime decay and CIE chromaticity coordinates.By controlling the concentration of Dy³⁺,the FPG can present a white light with a CIE chromaticity coordinate of?0.302,0.327?,which is very close to the equal energy point.The corresponding quantum efficiency?QE?and the luminance are 50.5%and 6706 cd/m²,respectively.3.For the white light emitted by the glass fluorescent body,the optical fiber collimation output can be carried out.Covered the entire system consists of three LED chip with fluorescent glass combination as a light source,and put the LED chip in fluorescent half spherical glass processing and shaping of its place,thus increasing the coupling light flux.Through the convergence and imaging of the lens,the light flux of the three points of light is combined together,and then the light spot is very small,and the optical fiber output can be carried out through the optical fiber collimator SMA905.