Fabrication And Characterization Of One-Dimensional Rare Earth Doped Cerium Phosphate Nanofibers

Electrospinning technology is used to prepare nanofiber. which is simple. convenient and low cost. The nanofibers prepared by electrospinning have good orientation. large specific surface area, large aspect ratio, dimensional stability and other characteristics, which can be applied in sensors, electronic and optical devices, biomedical fields.In this dissertation, electrospinning technology was successfully used to fabricate CePO4, CePO4:Tb3+, CePO4:Dy3+, CePO4:Eu3+ and CePO4:Tm3+ nanofibers by combining the properties of nanofibers with the properties of rare earth luminescent materials. Their surface morphology, crystal and optical properties were characterized by SEM (scanning electron microscopy), XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), TG-DTA (thermogravimetry-differential thermal analysis) and PL (photoluminescence spectra), respectively. The results showes that:(1) After high-temperature roasting, the organic matter and moisture in the complex fibers decompose gradually. Well-monoclinic phase CePO4. CePO4:Tb3+ CePO4:Dy3+, CePO4:Eu3+ and CePO4:Tm3+ nanofibers have been prepared, which diameters is small, about 180 nm; (2) Fluorescence analysis showed that the CePO4:Tb3+, CePO4:Dy3+, CePO4:Eu3+and CePO4:Tm3+nanofibers by electrospinning and high-temperature calcinations had good fluorescence properties. CePO4:Tb3+ nanofibers issued green light by 289 nm excitation, the optimum doping concentration of Tb3+ is 5.0 mol%; CePO4:Dy3+ nanofibers issued yellow light by 389 nm excitation and the emission intensities increase with the concentration of Dy3+ increasing in a certain range (0～5.0 mol%); CePO4: Eu3+ nanofibers issued strong red light by 409 nm excitation; CePO4:Tm3+ nanofibers issued blue light at 475 nm emission peak by 355 nm excitation. The studies also found that the emission intensities of the nanofibers were affected by the calcination temperature, with the calcination temperature increasing, the emission peak intensity gradually increased. These results have great significance for the luminescent nanofibers research.