Research On Condition Optimization And Properties Of Rare Earth Doped Aluminate And Molybdate Luminescent Materials

Rare earth doped nanomaterial,which can absorb the external light source and store up energy,belongs to a environmentally friendly material.Due to its extremely potential application value,it has been closely watched by relevant industry researchers for many years,especially in the fields of building curtain wall decoration,road junction emergency indication,paint,etc.After the mulching,breakthroughs have also been made in the field of biomedicine,but these two materials still have some problems such as insufficient luminescence brightness,irreg ular morphology,and excessive particle size.Therefore,research and preparation of target materials with good luminescence properties,regular morphology and nanometer scale has urgent practical needs and broad application prospects.The effects of different preparation conditions on the fluorescence intensity of the two target materials were investigated by single factor optimization experiments.The orthogonal experiments were carried out to optimize the synthesis conditions,and the optimal synthesis conditions were obtained.At the same time,the composition,particle size and fluorescence intensity of these two materials were investigated comprehensively.Specific research brief was as follows:(1)Srontium aluminate matrix phosphors were prepared by combining coprecipitation with hydrothermal reaction and high temperature calcination by co-doped(Eu²⁺as an activator and Dy³⁺as a coactivator).First,the effects of each preparation condition on the fluorescence intensity of the target material were investigated by a single factor optimization test,including the amount of activator Eu²⁺(n _Eu/n _Sr),the amount of coactivator Dy³⁺(the molar ratio of Dy³⁺relative activator Eu²⁺),and the matrix composition(molar ratio of aluminum to bismuth),high temperature calcination time,hydrothermal reaction time,amount of flux(solid H₃BO₃).A total of six preparation conditions were investigated here.On this basis,four preparation conditions that have a great influence on the fluorescence intensity of the material are selected(the doping amount of the activator n _Eu/n _Sr,the doping amount of the activator n _Dy/n _Eu,the solid H₃BO₃ doping amount M_B/M_P and the hydrothermal reaction time t),in the next,continue to implement orthogonal experiments to optimize the synthesis conditions and obtain the best preparation conditions.Through in-depth investigation of the fluorescence properties,composition and morphology of the target product through multiple experiments.(2)Srontium molybdate matrix phosphors were pr epared by combining coprecipitation with hydrothermal reaction and high temperature calcination(Eu³⁺as an activator).First,the effects of each preparation condition on the fluorescence intensity of the target material were investigated by a single fact or optimization test,,including the activator Eu³⁺content,coprecipitation reaction temperature,hydrothermal reaction temperature,hydrothermal reaction time,coprecipitation reaction p H,and high temperature calcination temperature.A total of six prep aration conditions were investigated here.On this basis,four preparation conditions that have a great influence on the fluorescence intensity of the material are selected(Eu³⁺content,coprecipitation,calcination reaction temperature,hydrothermal reac tion time),in the next,continue to implement orthogonal experiments to optimize the synthesis conditions and obtain the best preparation conditions.Through in-depth investigation of the fluorescence properties,composition and morphology of the target pr oduct through multiple experiments.