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Proceedings Paper

Mechanoresponsive change in photoluminescent color of rod-like liquid-crystalline compounds and control of molecular orientation on photoaligned layer
Author(s): Mizuho Kondo; Seiya Miura; Kentaro Okumoto; Mayuko Hashimoto; Ryohei Fukae; Nobuhiro Kawatsuki
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Paper Abstract

In this paper, we reported novel liquid-crystalline luminophore that switches its photoluminescent color by mechanically grinding. Mechanochromic luminescence (MCL) is expected for mechanical sensor, cellular imaging, detection of microenvironmental changes, and optical memory. In this work, we focused on liquid-crystalline MCL compounds on alignment layer. Controlling the molecular alignment of MCL compounds with photoalignment layer have potential to succeed in functional MCL film such as polarized micropatterned MCL and directional detection of mechanical stimuli. Herein, we prepared asymmetric rodlike MCL compounds containing cyano- and pyridyl molecular terminal and explored their photoluminescence behavior under mechanical stimulus. The cyano terminated compound showed a nematic phase and tuned its photoluminescent color from green to yellow upon grinding, while the pyridyl-terminated compounds that show no mesophase changed its photoluminescent color from blue to green and reverted to its initial color by heating above its melting point. The cyano-terminated MCL was aligned along the orientation direction of photoalignment layer and pyridyl-terminated MCL exhibited uniaxial alignment when it coated on photoaligned film containing carboxylic acid.

Paper Details

Date Published: 7 October 2014
PDF: 6 pages
Proc. SPIE 9182, Liquid Crystals XVIII, 91820A (7 October 2014); doi: 10.1117/12.2060552
Show Author Affiliations
Mizuho Kondo, Univ. of Hyogo (Japan)
Seiya Miura, Univ. of Hyogo (Japan)
Kentaro Okumoto, Univ. of Hyogo (Japan)
Mayuko Hashimoto, Univ. of Hyogo (Japan)
Ryohei Fukae, Univ. of Hyogo (Japan)
Nobuhiro Kawatsuki, Univ. of Hyogo (Japan)

Published in SPIE Proceedings Vol. 9182:
Liquid Crystals XVIII
Iam Choon Khoo, Editor(s)

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