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Pitch Variations in Cholesteric Liquid Crystals by Phase Separation  

Park Han-Soo (Materials Research Center for Information Display, Kyung Hee University)
Kim Beom-Kyung (Materials Research Center for Information Display, Kyung Hee University)
Kim Whan-Ki (Materials Research Center for Information Display, Kyung Hee University)
Kim In-Sun (I-components)
Song Ki-Gook (Materials Research Center for Information Display, Kyung Hee University)
Publication Information
Polymer(Korea) / v.30, no.2, 2006 , pp. 182-186 More about this Journal
Abstract
Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layer through a phase separation. The reflection bandwidth of the CLC cell was broaden as irradiation light intensity decreased and as the amount of the UV absorbing dye increased. Initial reflection bandwidth of 50 nm was broaden to 300 nm Various pitch distributions in the CLC cell was observed using SEM and ATR-IR technique was used to prove that the pitch distributions are induced through the phase separation.
Keywords
cholesteric liquid crystal; reflective polarizer; pitch distribution; phase separation; ATR-IR;
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