The Research Of Synthesis And Properties Of Titanate Luminescent Materials

Given the importance of energy conservation and environmental protectionon the world development, White Light Emitting Diode will replace incandescentbulbs and energy-saving lamps in the near future. For improving the luminescentintensity, color rendering index and other optical parameters, we study theinorganic luminescent material of WLED. In order to fulfill the variousmarketing requirement of luminescent material, researching the yellow andorange luminescent material which is used for GaN blue LED chips hasimportant theoretical significance and research value.In this paper, the precursor of SrxBa2-xTiO4: Eu3+, Gd3+phosphors issynthesized by sol-gel method. For getting the final luminescent material calcinethe precursor. Using the thermogravimetric analysis, differential thermal analysisand fourier transform infrared analyze the internal changes of the precursorbefore and after calcination. X-ray diffraction, X-ray photoelectron spectroscopyand energy dispersive spectrometer are used to analyze the crystalline phase andcomposition, scanning electron microscopy is used to analyze its morphology.Through the fluorescence spectrum analysis optimize the preparation conditions,research the optimal doping amount of rare earth element and the doping ratio ofalkaline earth element. We concluded that the best preparation conditions arecalcining3h under1000℃, when the citric acid and metal ions ratio reach2:1,the morphology is the best. Trivalent rare earth ions occupy the position of thealkaline earth metal, and there is no obvious lattice distortion. The4f electronicshell is introduced into conduction band and forbidden band with Eu3+doping.The luminescent materials is excited by466nm wavelength light, and the mainemission peaks are located at578nm、591nm and611nm respectively, theseemission peaks are fully matched well with blue chip. Through the luminescent performance analysis, the optimum doped amount of rare earth is SrxBa2-xTiO4:7%Eu3+,5%Gd3+, the best proportion of alkaline earth is set to3:2(Sr: Ba), theluminous intensity of luminescent material is the best in such conditions.In this paper, the SrxBa1-xTiO3: Eu3+, Gd3+phosphors is synthesized by high-temperature solid-phase method. Using the scanning electron microscopycharacterizes its morphology, X-ray diffraction and energy dispersivespectrometer are used to analyze the crystalline phase and composition. Throughthe fluorescence spectrum analysis optimize the preparation conditions, explorethe optimal doped amount of rare earth element and the doped ratio of alkalineearth elements. We came the finally conclusions: The best preparation conditionsis that calcinate3h under1100℃, rivalent rare earth ions occupy the position ofthe alkaline earth metal, and there is no obvious lattice distortion. Theluminescent materials are excited by394nm and466nm wavelength light, whenthe luminescent materials are excited by466nm wavelength light, the mainemission peaks locate at578nm、591nm and611nm. The activator Eu3+dopedand sensitizer Gd3+doped amount are3%and5%respectively, and the bestproportion of alkaline earth is4:1(Sr: Ba).