Control of Molecular Arrangement Using Programmed Reactive Mesogens for Negative Dispersion Retardation
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초록
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To improve the optical efficiency of the display devices by minimizing light reflection from the outside, we newly synthesized rod-shaped host reactive mesogen (rHRM) and X-shaped guest RM (xGRM). The negative dispersion (ND) retardation thin film was fabricated by spin-coating, self-assembly, and photopolymerization of the host-guest mixtures having different weight ratios. Based on thermal, optical, and structural analyses, the optimized contents of xGRM in the rHRM were 25-40 wt%. Because the hydroxyl group of rHRM can make intermolecular hydrogen bonding interaction with the imine group of xGRM, the latticework nanostructure was constructed, in which the conjugated backbones of xGRM were aligned along the smectic layer of rHRM. The newly developed optical thin film showed ND retardation closed to the ideal value, which can be applied to the flexible antireflective film. This work was supported by Mid-Career Researcher Program (2021R1A2C2009423) and BK21 FOUR program.