Study On The Synthesis And Properties Of Eu³⁺?Tb³⁺ And Tb³⁺?Dy³⁺ Co-Doped Luminescent Sodalite Materials

In this paper,Eu³⁺,Tb³⁺ and Tb³⁺,Dy³⁺ doped sodium silicate luminescent materials were synthesized by solid-state reaction at high temperature.By testing means of X ray diffractometer?XRD?,thermal quenching analyzer and steady/transient fluorescence spectroscopy measurements to determine the crystal structure luminescent properties,color purity,fluorescence lifetime were analyzed and characterized in detail.The conclusions are as follows:1.In this part,5%Eu³⁺ and 5%Tb³⁺ co-doped sodium silicate luminescent material materials were synthesized by high temperature solid state reaction at different synthesis time.The results of XRD showed that the crystal structure of 5%Eu³⁺ and5%Tb³⁺ was not changed,and the crystal structure was maintained.The excitation spectra and emission spectra of the samples reflect the influence of the change of the synthesis time on the luminescence intensity.The luminescence intensity of the samples increased first and then decreased with the increase of synthesis time,and the maximum was at 5hours.The results of color coordinate of the samples was?0.6309,0.3382?,and the color purity was 90.8%.2.In this part,the high temperature solid state reaction method was used to synthesized the sodium silicate luminescent materials Na₈Al₆Si₆O₂₄C_l2:5%Tb³⁺doped with different doping concentration of Dy³⁺ ions,the luminescence color of yellow green.XRD results for Dy³⁺ ions and Tb³⁺ ions have no effect on the doping of the other sodium crystal structure.It can be seen from the variation law of the excitation spectrum and emission spectrum of the sample that there is a reversible energy transfer between Dy³⁺ ion and Tb³⁺ ion.After doping 1%Dy³⁺ ions,the flourescence lifetime of Tb³⁺from 28.6272?s shorted to 18.1066?s,and accurately reflected the energy transfer between Dy³⁺ ions and Tb³⁺ ions.