Controlled Synthesis And Luminescent Properties Of Dy³⁺,Tm³⁺,Sm³⁺ Doped Luminescent Ca₂Mg（Zn）Si₂O₇ Material

In this paper,alkaline silicate Ca₂Mg（Zn）Si₂O₇ was selected as the matrix,The phosphors of rare earth ions were studied by means of co-doped and single-doped Dy³⁺/Tm³⁺,Sm³⁺ions.By means of X-ray diffractometer（XRD）,steady state/transient fluorescence spectrometer,etc.The structure,luminescence performance,fluorescence life and color purity of the test samples were analyzed in detail.The specific research contents were as follows:（1）A series of Ca₂Mg_1-xZn_xSi₂O₇:Dy³⁺、Tm³⁺luminescent materials were synthesized by high temperature solid phase method.The samples were characterized by XRD structure,and the excitation spectra,emission spectra,color temperature and fluorescence lifetime were measured.The results show that:（1）Ca₂MgSi₂O₇:Tm³⁺exhibits blue luminescence under the excitation of 355 nm.The color coordinate in CIE1931 is x=0.1659,y=0.0822,and the color purity is 89%.Ca₂MgSi₂O₇:Dy³⁺、Tm³⁺were excited by the superposition excitation bands of Dy³⁺and Tm³⁺,which showed bright white,cool white and warm white light at the excitation of 349 nm,353 nm and365 nm,and the correlation color values were 5193K,9672K and 4685K respectively.In conclusion,Ca₂MgSi₂O₇:Dy³⁺and Tm³⁺can be effectively excited between 300 nm-500 nm regions and white light produced by blue and yellow light combinations between 400 nm-600 nm.（2）Zn²⁺was introduced into the Ca₂MgSi₂O₇matrix,using Zn²⁺and Mg²⁺similar ion radius and electron characteristics.The Mg²⁺ions in the Ca₂MgSi₂O₇ matrix were replaced by Zn²⁺ion gradually to form an alternative solid solution.The test results of the photoluminescence of the samples show that:The peaks and peaks of the excitation spectra and emission spectra have not changed,but the intensity of luminescence has been greatly enhanced.（2）Zn²⁺was introduced to the lattice of Ca₂MgSi₂O_7,substitute the Zn²⁺in the substitutional solid solution to replace the Mg²⁺.A series of Ca₂Mg_1-xZn_xSi₂O₇phosphors were synthesized by high temperature solid phase method.Zn²⁺ion substituted Mg²⁺ionic crystal structure was not destroyed.The test results of photoluminescence show that:The introduction of Zn²⁺can increase the luminescence without changing the shape of the spectrum,without loss of color purity.when x=0.1,Ca₂Mg_0.9Zn_0.1Si₂O₇:2%Sm³⁺was the best proportion for this luminescent material,the luminescence intensity of Sm³⁺ions was the highest atλ_ex=402 nm.The emission spectra of the samples were 8.44 times that of the unmodified cationic Mg²⁺,Zn²⁺structure ratio Ca₂MgSi₂O₇:2%Sm³⁺sample.