Dynamic switching of circularly polarized light through selective reflection in a thermotropic chiral nematic liquid crystal phase

We prepared a circularly polarized luminescence (CPL) switchable cell by placing together a thermotropic chiral nematic liquid crystal (N*-LC) cell together with a CPL emitting film from lyotropic chiral di-substituted polyacetylene. In this paper, we present the dynamic switching of CPL from the selective reflection of CPL in a thermotropic N*-LC phase. N*-LCs are excellent organic photonic crystals for the generation of CPL due to their ease of synthesis and external stimuli responsiveness.