4.5 Article

The smectogenity as a crucial factor of broadening of the selective light reflection peak in cholesteric photopolymerizable mixtures

Journal

LIQUID CRYSTALS
Volume 49, Issue 11, Pages 1459-1465

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2022.2041745

Keywords

Smectogenity; cholesteric mesophase; gradient of the helix pitch; broadening selective light reflection band; UV-polymerisation; broadband polariser film; acrylates

Funding

  1. Czech Science Foundation [CSF 20-22615J]
  2. Samsung Advanced Institute of Technology
  3. Russian Foundation for Basic Research (RFBR) [19-53-26007]
  4. Institute of Problems of Chemical Physics of RAS [0074-2019-0014]

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This study investigates the broadening of the peak of selective light reflection in cholesteric liquid crystals during UV polymerisation, by creating a gradient of the cholesteric pitch. The results show the possibility of creating flexible and thin circular polarisers operating in a wide spectral range.
Cholesteric liquid crystals reflecting circularly polarised light are promising materials for creating flexible and compact polarisers. One of the issues of these systems is the narrow width of the photonic stop band. The range of selective light reflection can be increased by creating a gradient of the cholesteric pitch in the process of photopolymerisation of reactive cholesteric mixtures. The possibility of broadening the peak of selective light reflection during UV polymerisation of nematogenic diacrylate mixed with chiral monoacrylates was studied. The monoacrylates used had a different number of aromatic rings. A broadening of the peak of selective light reflection was observed during the photopolymerisation of mixtures containing a chiral monomer with three benzene rings. While before irradiation the width of the selective reflection peak was about 100 nm, after irradiation it was broadened to about 300 nm. A mechanism is proposed for the formation of the helical pitch gradient in the cholesteric, in which the smectogenity of the system plays a crucial role. The obtained results open up new possibilities for creating flexible and thin circular polarisers operating in a wide spectral range.

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