Study On The Structure And Properties Of Rare Earth Complex Luminescent Nano-films Prepared By Electrospinning

Electrospinning is a simple and low-cost method that can continuously produce nanofibers and membrane.The nano-fiber material prepared by electrospinning has high specific surface area,adjustable pore size and excellent mechanical properties.It has a wide range of applications in the field of thin membrane,high-efficiency filter materials,optical sensors and other nano-hybrid materials.lanthanide?Ln?ions,have particularly excellent luminescence characteristics and have a very sharp emission band,which makes them useful in technologies such as optoelectronic devices and sensors.In this paper,the electrospinning technology is used to disperse the rare earth complex into the nanofiber film,and a polymer composite with good fluorescence properties is obtained.The PVDF nanofiber film was prepared by electrospinning technology,and the effects of molecular weight,concentration,solvent ratio,voltage,distance and other factors on the internal structure and morphology were investigated.Nanofibers with uniform fiber controllability and membrane with high transparency were successfully prepared,and the crystal phase transition of PVDF under high pressure and tensile conditions was studied.The thermal properties of the fiber membrane were studied by atomic force microscopy?AFM?,thermogravimetric analysis?TGA?and differential scanning calorimetry?DSC?to provide a substrate for the luminescent film.PVDF transparent membrane containing Tb?acac?₃phen or Eu?tta?₃phen complex doped silica nanoparticles were prepared by electrospinning,respectively.First,the rare earth complex Tb?acac?₃phen and the rare earth complex Eu?tta?₃phen.The silica nanoparticles were hydrolyzed and encapsulated by complexes.PVDF luminescent fiber membranes containing rare earth complexes were prepared by electrospinning and characterized by SEM,TEM,FTIR,transient fluorescence spectrometer and other characterization methods.The relationship between fluorescence intensity,lifetime and yield is systematically analyzed.The principle of the influence of silica and PVDF on the fluorescence performance is discussed.The introduction of rigid materials can improve the fluorescent properties of hybrid materials by reducing the non-radiative attenuation rate.During the electrospinning process,PVDF changes from?phase to? phase,which has a more stable structure and thermal stability,which shows a more rigid structure.Therefore,compared with the emission of the pure complex,its emission spectrum is enhanced,the fluorescence lifetime is reduced,and the quantum yield is improved...