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Field‐induced Colour Change of Liquid Crystalline Dyes
Author(s) -
Pelzl G.,
Schubert H.,
Zaschke H.,
Demus D.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790140708
Subject(s) - liquid crystal , fréedericksz transition , liquid crystalline , electric field , anisotropy , materials science , planar , absorption (acoustics) , field (mathematics) , dielectric , condensed matter physics , chemical physics , optics , chemistry , optoelectronics , composite material , physics , computer graphics (images) , mathematics , quantum mechanics , computer science , pure mathematics
Planar oriented nematic layers and also partially oriented smectic C phases of certain diphenyl‐1,2,4,5‐tetrazine compounds due to their positive dielectric anisotropy can be oriented by an electric field (Freedericksz‐transition). The orientation is connected with a distinct change of absorption respectively colour. The mechanism of the effect is discussed. For both liquid crystalline phases the response times and decay times were measured.