Synthesis,Characterization And Properties Of Novel Fluorene-based Conjugated Polymers As Photoelectric Materials

Compared with inorganic materials,organic photoelectric materials have the advantages of low cost,convenience of preparation,large-area processing and variety,which can be easily modified by suitable groups to obtain different photoelectric functional materials.In recent years,organic photoelectric materials have attracted much attention in the field of photoelectric materials.In various organic photoelectric materials,polyfluorene and its derivative have become research hotspot.In this thesis,a series of fluorene-based conjugated polymers were synthesized.The relations of different photoelectric properties and molecular structures of polymers were investigated and some preliminary results were obtained.This Ph.D.thesis was divided into five parts,as follow:In chapter one,a praseodymium(Pr)-coordinated fluorene-based polymer containing phenanthroline ligand was synthesized.The structure has been characterized and determined.The photoelectric features of the polymer were studied by Thermogravimetry(TG),UV-vis absorpation,photoluminescence spectrum(PL)and cyclic voltammetry(CV).The effects of the Pr complex on the polymer electroluminescence device performance were investigated.The results showed that the incorporation of Pr into the polymer caused the effective tuning of emission light color.In chapter two,we synthesized a series of praseodymium(Pr)-coordinated fluorene-based polymers containing different steric conformation bipyridine ligand compared with phenanthroline.The structures and basic photoelectric features of the polymers have been characterized and analyzed.The emitting electroluminescence devices based on the resulting polymers were fabricated.The influences of bipyridine ligand and metal Pr on the photoelectric properties of the polymers were explored.By the corporation of bipyridine ligand and Pr,the electroluminescence color was finely tuned and the electroluminescence performance was effectively improved.In chapter three,a series of praseodymium(Pr)-coordinated donor-accepter polymers containing phenanthroline ligand were synthesized.The structures and basic photoelectric features of the polymers have been characterized and analyzed.The resistive switching devices with the configuration of ITO/Polymer/Al were constructed and exhibited nonvolatile write-once-read-many-times(WORM)memory behavior.The relations of the molecular structure and the memory performance were investigated.Based on the theoretical calculations of the polymers,the mechanism of the memory device was discussed and analyzed.In chapter four,we synthesized a series of praseodymium(Pr)-coordinated donor-accepter polymers containing bipyridine ligand.The structures and basic photoelectric features of the polymers have been characterized and analyzed.The memory devices fabricated with the resulting polymers owned better WORM memory performance.Based on the theoretical calculations of the polymers,the mechanism of the memory device was discussed and analyzed.The effects of phthalimide group and Pr complex on the polymer memory device performance were emphatically analyzed.In chapter five,the memory performance of a novel donor-accepter conjugated polymer containing maleimide group were studied.The memory devices exhibited nonvolatile rewritable(FLASH)memory behavior.The effects of light exposure on the structure of the polymer and the memory performance of the devices were explored.And the different light exposure conditions were also experimented and discussed.