Multifunctional Optical Thin Films Fabricated by the Photopolymerization of Uniaxially Oriented Lyotropic Liquid Crystal Monomers for Electro-Optical Devices

Abstract

A multifunctional optical thin film (MOTF) is fabricated by coating the newly synthesized perylene-based reactive mesogen (PBRM) and stabilized by the subsequent photopolymerization. Based on the spectroscopic results combined with morphological observations, it is found that nematic liquid crystal (NLC) is aligned parallel to the molecular long axis of PBRM not only due to the long-range physical anchoring effect but also due to the short-range molecular physical interactions between alignment layer and NLC molecules. From the electro-optical properties of LC test cells fabricated with the PBRM MOTF, it is clearly demonstrated that the PBRM MOTF can work as the planar LC alignment layer as well as the in-cell coatable polarizer. The coatable PBRM MOTF from lyotropic chromonic reactive mesogens can pave a new way for the flexible optoelectronic devices.

The Role of the 1,2,3-Triazolyl Heterocycle in the Helical Columnar Assembly and Electric Field Response

“…Under crossed polarizers, the aligned layer pattern is clearly observed, which shows a transmission maximum at an angle of 45° between the layer pattern and polarizers. This indicates the homogeneous alignment of the columns perpendicular to the electrodes. , …”

“…This indicates the homogeneous alignment of the columns perpendicular to the electrodes. 14,53 Figure 9b shows the conductance data upon heating from 25 to 80 °C. The conductance was determined from the slope of the obtained I−V curve.…”

Thin Film Polarizers Based on Lyotropic Liquid Crystals and Photoanisotropic Materials: Properties and Technologies

“…В [10,11,[13][14][15][16][17][18][19][20][21][22][23][24] с использованием ЛЖК первого типа получены сверхтонкие (0,2-2,0 мкм), цветные и нейтральные (серые), термостабильные (до 370 °С) и светостойкие (5-8 баллов по восьмибалльной шкале) дихроичные поляризующие пленки на основе, например, 3-хлориндантрон-4,4`-дисульфокислоты (сульфированного «индантрона») [14] и других красителей типа сульфокислоты азо-или полициклических соединений [17] или их солей [25], хризофенина и бензопурпурина [26] с достаточно хорошими поляризационными характеристиками (Ep порядка 0,8-0,9, Т порядка 0,35-0,42, S не менее 0,8, Kd в пределах 28 и V не менее 96,2 % (см. определения параметров в [27]).…”

Uniaxially Oriented and Polymerized Chromonic Nanocolumns for Redox-Responsive Smart Glass

“…The uniaxially oriented polymer network constructed with a lyotropic chromonic liquid crystal (LCLC) can be a strong candidate for a polarizing active layer with vivid coloration. The LCLC phase of a mesogenic molecule is a self-assembled supramolecular structure in a specific concentration of solution, and it is induced by the balance between π–electron attraction and electrostatic repulsion of the mesogenic molecule. − In general, LCLC exhibits two representative mesophases: nematic phase and columnar phase . In the LCLC mesophases, the supramolecular aggregates can be macroscopically aligned with a long-range order by uniaxial shear flow .…”

“…In the LCLC mesophases, the supramolecular aggregates can be macroscopically aligned with a long-range order by uniaxial shear flow . Uniaxially oriented LCLC thin films can show a high polarizability because of the highly oriented molecular structure of chromonic mesogens. − In addition to the polarizability, the chromonic mesogens can exhibit multichromic properties driven by external stimuli. − When the redox reaction is induced in chromonic mesogens, the electron density changes, and the absorption wavelength of the chromophore is shifted, and thus, the color changes. − Therefore, the development of redox-responsive LCLC thin films can allow us to fabricate smart glass devices capable of dynamic light modulation with high coloration efficiency. By coating, self-assembling, and polymerizing redox-responsive dichroic mesogens, uniaxially oriented LCLC polymer films are fabricated for the application of light modulators with bandwidth tunability and polarizability.…”