Abstract
Oligo(p-phenylenevinylene)-based chiral nematic liquid crystals were synthesized. Mixtures of dimeric and monomeric materials exhibited a glassy chiral nematic phase at room temperature, and the reflection band was tunable from near UV to near IR areas by the temperature and mixing ratio of the chiral nematic materials. The reflection band could be tuned to cover the emission band of the oligo(p-phenylenevinylene) chromophores completely, resulting in the circularly polarized fluorescence with the dissymmetric factor exceeding 1.4. The reflection band could be immobilized by cooling film samples of the mixtures in ice water. The dissymmetric factor of the glassy chiral nematic films exceeded 1.3 at room temperature. From the film samples of the S-form of the chiral nematic liquid crystals emitted left-handed circularly polarized light while right-handed circularly polarized light was enhanced at the edge of the reflection band due to the Purcell effect.
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