Angew. Chem. Int. Ed. 2014, Early view Dynamic Switching of the Circularly Polarized Luminescence of Disubstituted Polyacetylene by Selective Transmission through a Thermotropic Chiral Nematic Liquid Crystal Benedict A. San Jose, Jialin Yan, and Kazuo Akagi* Department of Polymer Chemistry, Kyoto University (Japan)

Circularly Polarized Luminescence (tunable solid-state laser) S. Furumi et al., Adv. Mater., 2010, 22, 886. → (Polychromatic LC laser array toward display application) S. M. Morris et al., Opt. Express, 2008, 16, 18827.

Purpose Thermotropic N*-LC “Selective Reflection”

Structures of Components bM = 449 mm-1 for (R)-D1 bM = 408 mm-1 for (S)-D1 B. A. San Jose et al., JACS, 2012, 134, 19795. M. Guo et al., JACS, 2007, 129, 8519.

(Thermotropic LC phase) CPL-switchable Cell N*-LC layer: PCH 302:PCH 304:(S)-D1 (= 100 : 100 : 2.2 molar ratio) (Thermotropic LC phase) 25 ˚C: N*-LC phase →　36 ˚C: isotropic phase

Miscibility Test for the Helical Sense

Disubstituted LC Polyacetylenes B. A. San Jose et al., JACS, 2012, 134, 19795.

Disubstituted LC Polyacetylenes (CHCl3) (N*-LC film)

Disubstituted LC Polyacetylenes (right-handed) (left-handed)

PL and Selective Reflection Band

Dynamic Switching of CPL gem = -1.79 (25 ˚C) gem = +1.25 x 10-1 (40 ˚C)

Dynamic Switching of CPL (R)-N*-LC/(S)-PA1 Opposite handedness gem = +1.77 (25 ˚C) gem = -1.46 x 10-1 (40 ˚C)

Conclusion B. A. San Jose et al., Adv. Funct. Mater., 2014, Early View