| CaAl2Si2O8 is a tectosilicate,and the silicon(aluminum)oxygen tetrahedron in the structure is connected in a three-dimensional space with a common angle top.CaAl2Si2O8 as a superior performance of the luminescent material of the base material,has a high chemical stability and thermal stability,the luminous color and color temperature are adjustable.By adjusting the doping amount and proportion of rare earth ions Eu,Ce and Tb,the intensity of the characteristic peaks of blue,green and red light is adjusted.This paper adopts high temperature solid state reaction method at different sintering temperature(1150?,1250? and 1350?)4 hours of sintering preparation of doped different rare earth ions content and ratio of CaAl2Si2O8:RE(RE=Eu,Ce,Tb)series of fluorescent materials in air.By using X ray diffraction(XRD),laser Raman spectroscopy(Raman),photoluminescence spectroscopy(PL)and X ray fluorescence spectrometer(XRF)of sintering temperature,doping amount and ratio of CaAl2Si2O8:RE(RE=Eu,Ce,Tb)crystal structure series fluorescent material ring,and the relationship between CaAl2Si2O8 the structure and fluorescence intensity.In this paper,the luminescent properties and Raman vibration spectra of CaAl2Si2O8:RE(RE=Eu,Ce,Tb)fluorescent materials are discussed.(1)The material structure of the base material determines the luminescent properties of the sample.The sintering temperature has a significant effect on the structure and luminescence properties of the fluorescent material:The samples sintered at 11500C were composed of main phase SiO2 and heterogeneous CaAl2Si2O7-The samples were mainly red fluorescence under UV fluorescence.The samples sintered at 1250? and 1350? were CaAl2Si2O8 pure phase,but their characteristic groups were There is a difference in the intensity of the vibration.The vibration peak at 505 cm-1 corresponds to the vibration mode of silicon(aluminum)oxygen tetrahedron of CaAl2Si2O8 crystal,and its Raman vibration intensity increases with the temperature increasing.The Raman vibration peak intensity of octahedral coordination of silicon(aluminum)octahedron at 757cm-1 and 823cm-1 is obviously decreased with the increase of temperature,indicating that the material structure is obvious Unlike the two samples,the sintered samples emit pink and blue fluorescence,respectively.(2)The doping amount and ratio of rare earth have no significant effect on the phase composition of the sample,but the influence of the fluorescence intensity and the luminous position of the sample is proportional to the rare earth doping amount.The ion transition of Tb3+ causes the green light emission at 542nm.The ion transition of Eu3+ causes red emission at 586nm and 610nm.The ion transition of Ce3+ and Eu2+causes the blue emission at 400?450nm.(3)When the rare earth doping amount is the same,the increase of the temperature makes the rare earth ion species and the number of the main enrichment on the sample surface change,so that the fluorescence intensity of the sample and the color of the emitted light are changed.The intensity of the emission peak is proportional to the temperature.Therefore,to increase the fluorescence intensity of the fluorescent material,it is necessary to increase the sintering temperature of the sample.The fluorescent materials with CaAl2Si2O8 as the substrate exhibit different luminescence under different experimental conditions,and the raw materials are inexpensive,the preparation process is simple and the performance is excellent,and the scientific and economic value is further studied.Eu,Ce and Tb were mixed into the substrate materials,and their corresponding emission spectra were generated in the red,blue and green regions,which laid a preliminary scientific research foundation for the future preparation of white fluorescent materials.In this paper,it is considered that Ca0.98Al2Si2O8:RE0.02(Eu:Ce:Tb =1:1:1)sintered at 1350 ? is suitable as a better blue fluorescent material because of its high luminous intensity. |
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