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- W2308491187 abstract "Orientation of [pi]-conjugated molecules across alarge area without defects is potentially useful to a host ofoptoelectronic devices. Solution cast films of active materialshave been processed into uniaxially oriented and helically stackedconjugated molecules mediated by nematic and cholesteric liquidcrystalline mesomorphism, respectively. In this thesis, bothglassy-nematic and glassy-cholesteric films were prepared viathermal annealing of thermotropic liquid crystals at an elevatedtemperature and solvent-vapor annealing of lyotropic liquidcrystals at room temperature on both rubbed polyimide alignment andnoncontact photoalignment layers followed by cooling through glasstransition temperature and thorough drying in vacuo, respectively.Major accomplishments are recapitulated as follows. Mixtures ofpentafluorenes doped with a red-emitting oligofluorene wereprepared between rubbed polyimide alignment layers intoconstant-pitch glassy-cholesteric liquid crystal films, yieldinglasing thresholds and efficiencies comparable to widely reportedfluid cholesteric liquid crystal lasers. Robust glassy-cholestericliquid crystal films, however, produced temporally stable lasingoutput, an advantage over their fluid counterparts whose lasingoutput diminished with time presumably because of undesirableheating during optical pumping, light-induced pitch dilation, andlaser-induced fluid flow. Glassy-cholesteric liquid crystals werefurther processed into spatially resolved lasers via thermallyactivated diffusion across the interface of two films comprisingdisparate chiral contents. The observed lasing thresholds andefficiencies are superior to those from spatially resolved fluidand glassy-cholesteric liquid crystal lasers reported to date. Theformation of Grandjean-Cano bands, each characterized by a discretepitch length, was explained by strong anchoring on rubbed polyimidealignment layers and the lateral chiral concentration profilefrozen in the solid state after thermal processing. Aroom-temperature photoalignment strategy was demonstrated forprocessing oligo(fluorene-co-bithiophene) and heptafluorene intomonodomain, uniaxially oriented glassy-nematic films possessingorientational order parameter values identical to those achieved onrubbed polyimide alignment layers. The difference in time toachieve maximum uniaxial orientation with solvent-vapor annealingon rubbed polyimide alignment layers and photoalignment layers,5-10 s versus 6-8 min, might have originated from [pi]-[pi]electronic interactions at the polyimide and conjugated oligomerinterface. Nevertheless, the feasibility of room-temperaturephotoalignment methodology on plastic substrates, as demonstratedherein, represents a crucial step forward in plasticoptoelectronics." @default.
- W2308491187 created "2016-06-24" @default.
- W2308491187 creator A5074766423 @default.
- W2308491187 date "2011-01-01" @default.
- W2308491187 modified "2023-09-23" @default.
- W2308491187 title "Ordered Organic Solids via Liquid Crystalline Mesomorphism for Optoelectronics" @default.
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