Synthesis And Proerties Of Rare Earth Luminescent Material Through Polymer Assisted Methods

The polymer has some interaction force with inorganic ions and granular. Variousfunctional materials can be prepared By the combination the nature and the methods（hardtemplate method, soft template method, surfactant assisted hydrothermal method, polymerassisted etching method, polymer assisted method）. Due to its direct, simple and efficientadvantages, it will have broad application prospects in chemical preparation and synthesisof new functional materials. For its simple production, easy post-processing, environmentfriendly type, it will have broad application prospects in chemical preparation andsynthesis of new functional materials. This dissertation focuses on using different assistedmethods for preparing three kinds of different shape of products, including polymer/rareearth composite microspheres, hollow microspheres and monodisperse nanoparticles. Dueto the appearance characteristics，They have different potential applications. The compositemicrospheres can be used as biological sensors. The composite polymer can be used fordrug-loading medicine. The fluorescent monodisperse nanoparticles can be used in theproduction of fluorescent powder. The main content is as follows:YF₃:Tb³⁺hollow microspheres have been successfully fabricated via a urea-basedhomogeneous precipitation method in the presence of colloidal melamine formaldehyderesin （MF） microspheres as templates without heat treatment. X-ray diffraction （XRD）,scanning electron microscopy （SEM）, transmission electron microscopy （TEM）,photoluminescence （PL） spectra were employed to examine the resulting phase formation,morphology and luminescent properties of the sample. The XRD result reveals that thedoped sample is of high crystallization, which is assigned to the pure orthorhombic systemphase of YF₃. Upon excitation by ultraviolet excitation, the YF₃:Tb³⁺sample shows stronggreen light emission under ultraviolet excitation.Colloidal polystyrene-acrylic （PSAA） microspheres were prepared by soap-free emulsion polymerization method. PSAA/Gd（OH）CO₃:Eu³⁺spheres were obtained due tothe affinity and coordination action of the carboxyl group on the surface of PSA. Finally,PSAA/GdVO₄:Eu³⁺hybrid microspheres are prepared by the reaction of NH4VO₃and theprecusor PSAA/Gd（OH）CO₃:Eu³⁺under ultrasonication. FTIR, TEM, TGA and PL areused to examine the phase formation, morphology, thermal stability and luminescentproperties. The results showed that the product has the obvious core-shell structure and thesame diameter. Moreover, the microspheres show a strong red emission corresponding tothe5D0â†'7F2transition of Eu³⁺under ultraviolet excitation. The productPSAA/GdVO₄:Eu³⁺hybrid microspheres may have potential applications in medicinefluorescence and NMR imaging.The Gd₂O₃: Eu³⁺microspheres are successfully fabricated under solvent hydrothermalconditions using PVP as surfactant, end capping and dispersion agent, the mixture of waterand methanol as solvent. The XRD, TEM and PL are employed to examine the phaseformation, morphology, and luminescent properties. The XRD result shows that the sampleis with high crystallization and the cubic phase of Gd₂O₃. Under the ultraviolet excitation,Gd₂O₃: Eu3+sample shows strong red light. The other rare earth oxide could be obtainedvia similar method.