The Preparation And Optoelectronic Properties Of 9-phenyl-fluoren-9-ol-based Supramolecular Polymer Semiconductors

Organic semiconductors, with a rapid development since 1970s, have made many substantial progress on material synthesis, device performance and industrial production. It maybe a strategy to develop next generation's device via supermolecular functionalization through reasonable molecular desigh as well as supramolecular self-assembly.In this paper, we have concentrated on 9-phenyl-fluoren-9-ol-based oligofluorenols. we make use of supramolecular approach to study 9-phenyl-fluoren-9-ol-based supramolecular polymer and to analyse aggregation behaviors of the oligofluorenols. To understand the aggregation effects on electronic structures, the packing structures and the UV/vis absorption spectra of oligofluorenols were studid experimentally and theoretically.We proved that the molecular aggregation favors the appearance of planar ?-conjugated structures.The aggregation-induced red-shift in absorption spectra of oligofluorenols was resulted from increased content of planar conformations in molecular aggregates.All above discovery also validated the theory of aggregation-induced green band emission of polyfluorene.To eliminate the negative effect of green band emission, we introduce spiro-fluorene functionalized group into the oligofluorenols compounds. We'd like to make the steric hindrance group to break the ?-? conjugations in the oligofluorenols so as to synthesis stable blue-light emission materials. Theoretical work has drawn a conclution that in 208-DPFOH-SFX side chain and the fluoren chain favors to be coplanar since the steric hindrance groups limit the twist of the flexible chain.Successfully designed and synthesized, and investigated H-shape multi-hydroxy moleculars. Testing them with MEL to approve that green light emission in high concentration solution resuled from the formation of excimer. The emission colour of OLED using H-shape moleculars were stable green light under high voltage.