Electrospinning Preparation And Photoluminescence Properties Of Rare Earth Composite Fibers

Luminescent rare earth organic complexes are of fundamental and technical interest due to their characteristic luminescence properties, such as extremely sharp emission bands, long lifetime, and potential high internal quantum efficiency. It can be used in analytical chemistry and biochemistry as biological probe, biomarkers, organic electroluminescent devices, shine membrane layer. In highly sensitive time-resolved fluorescence immunoassay analysis and exploration on the structure of genetic material life also has important application value. However, pure complexes usually do not have good thermal and mechanical stabilities and processing ability, which restricts the complexes to promising extensive photophysical applications and limited practical uses. Rare earth complexes incorporated in polymer matrixes embody a new class of materials that present the characteristics of both the complexes and polymers.Rare earth complexes - polymer composite materials were studied in our research. Combining soap-free polymerization, sonication with electrospinning, the rare earth complexes - polymer composition fibers were obtained. The effect of different factors on the the morphology, structure and luminescent properties of composition fibers were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform Infrared spectroscopy (FT-IR) and Fluorescence Spectrometer (FS). Under optimized conditions, rare earth complexes - polymer composition fibers with pure emission, high luminescent intensity and long life time can be prepared. The major results as follows:Rare earth complexes, used in the electrospinning, were prepared by precipitation and sonication respectively. Changing the factor, such as pH during the precipitation and power output during the sonication, the rare earth complexes are with different nano unit (nanoparticles , nanorods), luminescent intensity and life time. The rare earth complexes were incorporated in the polymer via sonication, and thus composition nanoparticles with core-shell structure were formed. Furthermore, the parameters of electrospinning have important effect on the morphology and uminescent properties of the rare earth complexes - polymer composition fibers .