title: Dynamic switching of the circularly polarized luminescence of disubstituted polyacetylene by selective transmission through a thermotropic chiral nematic liquid crystal.
abstract: The circularly polarized luminescence (CPL) of chiral disubstituted liquid-crystalline polyacetylene (di-LCPA) can be dynamically switched and amplified from left- to right-handed CPL and vice versa through the selective transmission of CPL across a thermotropic chiral nematic liquid crystal (N*-LC) phase. By combining a chiral di-LCPA CPL-emitting film with an N*-LC cell and tuning the selective reflection band of the N*-LC phase to coincide with the CPL emission band, a CPL-switchable cell was constructed. The phase change induced by the thermotropic N*-LC cell by varying the temperature leads to a change in the selective transmission of CPL, which enables the dynamic switching and amplification of CPL. It is anticipated that CPL-switchable devices might find applications in switchable low-threshold lasers and optical memory devices.
authors.affiliation: Department of Polymer Chemistry, Kyoto University, Katsura, NIshikyo-ku, Kyoto 615-8510 (Japan).
authors.forename: Benedict A
authors.initials: BA
authors.lastname: San Jose
authors.forename: Jialin
authors.initials: J
authors.lastname: Yan
authors.forename: Kazuo
authors.initials: K
authors.lastname: Akagi
keywords: chirality; liquid crystals; luminescence; nematic phases; polyacetylenes