
Proceedings Paper
Photochemical on-off switching of structural color of a multi-bilayered film consisting of azobenzene-polymer liquid crystal and polyvinylalcoholFormat | Member Price | Non-Member Price |
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Paper Abstract
Photo-responsive multi-bilayered film consisting of azobenzene polymer liquid crystals (PAzo) and polyvinylalcohol
(PVA) was prepared on a glass substrate by spin coating of the polymer solutions alternately. The reflectivity of the
multi-bilayered film disappeared by annealing at 80 °C. The disappearance of the reflection by the annealing was related
to the thermal out-of-plane molecular orientation of PAzo even in the multi-bilayered film, leading to a very small
difference in refractive indices between PAzo and PVA. The reflectance of the multi-bilayered film was increased again
by UV irradiation because of the transformation from the
out-of-plane orientation to the in-plane random orientation,
resulting in the restoration of difference in the refractive indices. In this way, the on-off switching of the reflection was
achieved by combination of the thermally spontaneous out-of-plane molecular orientation and following
photoisomerization of PAzo comprising the multi-bilayered film.
Paper Details
Date Published: 7 September 2011
PDF: 6 pages
Proc. SPIE 8114, Liquid Crystals XV, 81140J (7 September 2011); doi: 10.1117/12.892061
Published in SPIE Proceedings Vol. 8114:
Liquid Crystals XV
Iam Choon Khoo, Editor(s)
PDF: 6 pages
Proc. SPIE 8114, Liquid Crystals XV, 81140J (7 September 2011); doi: 10.1117/12.892061
Show Author Affiliations
Published in SPIE Proceedings Vol. 8114:
Liquid Crystals XV
Iam Choon Khoo, Editor(s)
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