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Synthesis And Study Of Rear Earth Luminescent Materials

Posted on:2007-03-25Degree:MasterType:Thesis
Country:ChinaCandidate:F GaoFull Text:PDF
GTID:2121360185990211Subject:Inorganic Chemistry
Abstract/Summary:PDF Full Text Request
Because of the special electronic shell structure, the rare earth-doped luminescence materials have been provided with outstanding luminescence properties than the other type luminescence materials. Owning to the properties of high brightness, long afterglow, adjustable wavelength scale and non-radiation substance, more and more attention is paid to the studies of rare earth ion activated luminescence material.In this study, luminescent powders of SrAl2O4:Eu2+, Dy3+ were synthesized by solid state reaction method with raw materials of SrCO3 and Al2O3. The influencing factors of phase and luminescence properties of the SrAl2O4:Eu2+, Dy3+ samples were characterized by X-ray diffraction (XRD) analysis, fluorescence spectrometer analysis and spectrophotometer analysis. By means of experiment, the anneal temperature, the consistency of Eu2+ and Dy3+ and the adding quantity of the flux H3BO3 were ascertained. The synthesized material SrAl2O4:Eu2+,Dy3+ appears excellent luminescence properties, such as broadband emission and excitation spectra, long afterglow decay time. Cause the excitation spectrum is a broadband spectrum from 300nm to 480nm, SrAl2O4:Eu2+, Dy3+ can be excited by sun light. The emission spectrum also is a broadband spectrum from 450nm to 600nm, the peak emission spectrum is in 512nm. The emission light of SrAl2O4:Eu2+, Dy3+ was bright. Three hours later, it still can be see clearly with eye in dark since the excitated with duration of 30 minutes by 25W daylight lamp was stutted up. So, with the good practicability, the material of SrAl2O4:Eu2+, Dy3+ can be used in many regions.Ultrafine lanthanon-doped Sr2CeO4 phosphors were prepared by Citrate-Gel Method using 1:1.3 ratio of nitrate/citrate. Phase evolution of the synthesized powder was determined by X-ray diffraction (XRD) techniques and thermal analysis (TG-DTA) . Single-phase Sr2CeO4 crystalline powder was obtained by calcinating the precusor at 1200℃ for 2 hours and no intermediate phase was observed. Scanning electron microscope(SEM) images of as-synthesized powders showed a foamy, porous...
Keywords/Search Tags:Luminescence Materials, Solid State Reaction Method, Citrate-Gel Method, SrAl2O4:Eu2+,Dy3+, Sr2CeO4:Re
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