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Photoresponsive Glass‐Forming Butadiene‐Based Chiral Liquid Crystals with Circularly Polarized Photoluminescence
Author(s) -
Vijayaraghavan Ratheesh K.,
Abraham Shibu,
Akiyama Haruhisa,
Furumi Seiichi,
Tamaoki Nobuyuki,
Das Suresh
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701230
Subject(s) - materials science , photoluminescence , moiety , alkyl , photochromism , luminescence , structural coloration , excitation , molecule , side chain , photochemistry , liquid crystal , phase (matter) , optoelectronics , composite material , nanotechnology , organic chemistry , polymer , chemistry , engineering , photonic crystal , electrical engineering
The synthesis and study of the photo‐ and thermoresponsive behavior of a series of novel trimesogens consisting of a diphenylbutadiene core linked to cholesterol moieties on either side via flexible alkyl chains are reported. These molecules possess the combined glass‐forming properties of bischolesterols and the photochromic and luminescent properties of the butadiene moiety. The pitch of the cholesteric phase of these materials could be continuously varied thermally and photochemically, making it possible to tune the color of the film over the entire visible region. The color images thus generated could be stabilized by converting them to N* glasses. These materials were also highly photoluminescent, exhibiting circularly polarized characteristics in the glassy liquid‐crystalline state even by linearly polarized excitation.