Premium
New properties and applications of rewritable azo‐dye photoalignment
Author(s) -
Muravsky Alexander,
Murauski Anatoli,
Chigrinov Vladimir,
Kwok HoiSing
Publication year - 2008
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2976652
Subject(s) - homeotropic alignment , materials science , anisotropy , liquid crystal , wavelength , optics , optoelectronics , tilt (camera) , azimuth , visible spectrum , rotation (mathematics) , relaxation (psychology) , computer science , physics , mechanical engineering , psychology , social psychology , artificial intelligence , engineering
— The rewritable azo‐dye photoalignment (ORW) of liquid crystals (LCs) for application in optical rewritable electronic paper has been investigated. It was observed that a periodic change in the azimuthal aligning direction with polarized UV light (365 nm) brings about homeotropic alignment, while utilization of visible light (450 nm) does not affect the LC tilt angle. The wavelength dependence of the ORW photoalignment result and the behavior of the photoinduced anisotropy was explored. The dark amplification of film anisotropy after exposure was observed, which is believed to be the relaxation process related to hydrogen bonding in azo‐dye film. New material, CD1, for azo‐dye rotation photoalignement that possesses a high azimuthal anchoring energy (about 2 × 10 −4 J/m 2 ) was found.