A Combination of Selective Light Reflection and Fluorescence Modulation in a Cholesteric Polymer Matrix

The phase behavior and optical properties of a cholesteric ternary copolymer, containing nematogenic phenylbenzoate, cholesteric, and photochromic diarylethene side groups, and its mixture with 2 wt.‐% fluorescent dopant were studied. The investigation of the kinetics of a photochemical opening‐cycl...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2005-02, Vol.26 (3), p.177-182
Main Authors: Medvedeva, Dasha, Bobrovsky, Alexey, Boiko, Natalia, Shibaev, Valery, Zavarzin, Igor, Kalik, Marina, Krayushkin, Mikhail
Format: Article
Language:English
Subjects:
cholesteric copolymer
diarylethene groups
fluorescence
photochemistry
photochromism
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Summary:The phase behavior and optical properties of a cholesteric ternary copolymer, containing nematogenic phenylbenzoate, cholesteric, and photochromic diarylethene side groups, and its mixture with 2 wt.‐% fluorescent dopant were studied. The investigation of the kinetics of a photochemical opening‐cycle process of the photochromic groups in the cholesteric mixture proved the energy transfer from the fluorescent dopant to the photochromic diarylethene groups. It was shown that the fluorescence intensity of the fluorescent dopant could be controlled by the portion of the “closed” form of the diarylethene groups. During the photocyclization of the photochromic groups a “degeneration” of the selective light reflection of the cholesteric matrix is observed. Fluorescence‐resonance energy transfer makes possible the process of photosensitization of the back ring‐opening photoreaction of the photochromic diarylethene groups in the cholesteric polymer matrix.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200400483