Synthesis And Luminescence Properties Of Nprosiped Rtie Earth Oxysalt Materials

Recently,as the continuous development of optical technology and the continuous expansion of application fields,nano-luminescent materials have been one of the hot points of functional materials research.There are many compounds of the nano-rare-earth oxyacid salt materials family,such as rare-earth phosphate materials,rare-earth titanates,rare-earth vanadate materials,etc.They have attracted great interest from researchers due to their high luminous efficiency and structural stability.In this thesisi,we synthesized nano-rare-earth oxysalt materials by hydrothermal method and sol-gel method.The nano-sized rare earth oxy-acid salt materials with different morphologies were synthesized by controlling the process parameters.The products were analyzed by powder X-ray diffraction?XRD?,morphology characterization?SEM,TEM,HRTEM?,and the different hydrothermal conditions on the material structure were studied.The influence of morphology;through the infrared spectrum test of the material,UV-visible absorption spectrum and room temperature photoluminescence performance test,and study its luminescence properties.We synthesized stick-like EuPO4·H2O nanomaterials by hydrothermal method,and synthesized hexagonal EuPO4·H2O nanomaterials by controlling hydrothermal reaction parameters such as time,temperature and pH value of solution.Room temperature photoluminescence measurements show that under the excitation of a light source with a wavelength of 394 nm,strong red fluorescence emission occurs in the visible light region between 589 nm and 614 nm.We synthesized NdPO4·nH2O?n=0,1?nanomaterials by hydrothermal method,and synthesized monoclinic NdPO4 and hexagonal NdPO4·H2O nanomaterials by controlling hydrothermal reaction parameters such as time,temperature and solution pH value.By testing the room temperature photoluminescence of the material,the monoclinic NdPO4 and hexagonal NdPO4·H2O nanomaterials were excited at 520 nm,540 nm,and 584 nm to produce different emission at 776 nm,807 nm,and 873 nm.Peak;When pH=5,the synthesized sample was a mixed phase of monoclinic NdPO4and hexagonal NdPO4·H2O,and the luminescence intensity was the strongest at this time.Spheroidal NdPO4·H2O nanomaterials were synthesized by changing experimental methods,and the effect of morphology on luminescence intensity was studied.The rod-like PrPO4 nanomaterials were synthesized by hydrothermal method and the emission spectra of the rod-like PrPO4 nanomaterials excited at 234 nm were studied.The emission peaks at 694 nm were generated.The emission peaks are characteristic peaks of deep red emission of PrPO4 nanomaterials.The particle structure of CaTiO3:Pr³⁺fluorescent material with perovskite structure was synthesized by sol-gel method.Through the room temperature photoluminescence performance test,under the excitation of a 309 nm light source,a strong red light emission characteristic peak appears at 614 nm;the effect of Pr³⁺concentration on the luminous intensity of CaTiO3:Pr³⁺fluorescent material is studied by doping with different Pr³⁺concentrations.When the doping concentration of Pr³⁺is3%,the luminous intensity of CaTiO3:Pr³⁺nanomaterials is the strongest.