Design Of Mesoporous SiO₂ ?ZnO? Matrix Rare Earth Composite Materials And Study On Their Luminescent Properties

It is well known that rare earth composites exhibit characteristic luminescence properties under ultraviolet light irradiation,showing sharp and much stronger emission band.It is because that the ligands in the composite materials absorb the energy of the excitation light,and the effective intramolecular energy transfers are taken place from the ligand to the rare earth ion luminescence center under the irradiation of ultraviolet light.In the past few years,the mesoporous materials were often used as the carriers of the rare earth materials to prepare the luminescent composite materials for the purpose of improving the luminous efficiency of rare earth elements.The prepared composite materials show some novel and unique properties,which have aroused the widespread attention of scientific research personnel.Some specific works were developed about mesoporous/ rare earth composite luminescence materials in this thesis as follows:In this study,the sulfosalicylic acid salts of Tb and Yb compounds were systematically assembled into the pores of SBA-15 by hydrothermal method.The influences of the content of Yb³⁺ and Tb³⁺ on luminescent properties of the prepared materials have been studied.The optimum proportion of Tb and Yb was confirmed by the highest emission intensity of the luminescent spectra of the prepared samples.The prepared materials show much stronger emission of Tb³⁺ at 543 nm.In this study,the phosphate acid salts of Eu and Tb compounds were systematically assembled into the pores of pores SiO2 by sol-gel synthesis method.The influences of the content of Eu³⁺ and Tb³⁺ on luminescent properties of the prepared materials have been studied.The optimum proportion of Eu and Tb was confirmed by the highest emission intensity of the luminescent spectra of the prepared samples.The prepared materials show much stronger emission of Eu³⁺ at 594 nm.In this study,the sulfosalicylic acid salts of Tb and Yb compounds were systematically assembled into the pores of ZnO by hydrothermal method.The influences of the content of Yb³⁺ and Tb³⁺ on luminescent properties of the prepared materials have been studied.The optimum proportion of Tb and Yb was confirmed by the highest emission intensity of the luminescent spectra of the prepared samples.The prepared materials shows much stronger emission of Tb³⁺ at 543 nm.