Fluoren-Based Organic Nanogrids: Design,Synthesis And Functionalization

Compared with inorganic semiconductors, organic semiconductors gained widespread concern by the research community and industrial community because of its flexible processability, efficient design and simple preparation of new organic semiconductor material, has now become an important research direction in this area. Fluorine-based material has a high luminous efficiency, 2,7,9 position can be modified and so widely used in electroluminescent devices, organic laser, FET and information memory. In many fluorine based organic semiconductor materials, diaryl fluorene semiconductor as its special electronics, space and conformational structure, showing a good prospects for commercialization. Butylfluorenyl based Friedel-Crafts reaction of tertiary alcohols is a new and efficient powerful tool for the preparation of diaryl fluorene organic semiconductors.In this thesis, based on previous work in our group,a series of fluorine-based grid molecules(so-called Grid fluorenes) have been synthesized by means of shape-supported cyclization, starting from H-shaped precursors via the alternative Friedel-Crafts reactions of fluorenols and Suzuki cross-coupling reactions. The basic physical tests show that, compared to the comparative molecule, such new nano grad type materials have better thermal stability, electrochemical stability and spectral stability. Simple light emitting device whit such molecules as light-emitting layer prepared shows electrical electroluminescent properties of such molecules, although the electroluminescent properties are not particularly satisfactory, but because of its thermal stability, electrochemical stability, at the same time, the new "grid" type molecule can exhibit a high luminescence quantum efficiency. Fluorenol approaches and nanogrids open a door to soluble one-, two-, or three-dimensional nanoporour polymers as next-generation polymer mechano-semiconductors facing a new era of consciousness.