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.
We synthesized chiral dimeric chiral nematic (N*) liquid crystals bearing tri(p-phenylene vinylene) units. The mixture of the dimeric compounds and monomeric chiral liquid crystal exhibited a glassy N* phase at...
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