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Proceedings Paper

Helicity, assembly, and circularly polarised luminesence of chiral AIEgens
Author(s): Hongkun Li; Bing Shi Li; Ben Zhong Tang
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Paper Abstract

As opposed to most fluorophores that suffer from aggregation-caused quenching (ACQ), aggregation-induced emissive luminogens (AIEgens) possess very weak fluorescence in solution, but show strong emission upon aggregation due to restriction of intramolecular motion (RIM). Since AIEgens are often comprised of propeller-shaped structures, i.e. polyphenylsiloles or tetraphenylethylene (TPE), the attachment of chiral units has recently proven a powerful tool to fabricate chiral AIEgens exhibiting strong circularly-polarized luminescence (CPL) signal upon aggregation. Different chiral moieties lead to various assembled structures, such as helical nanoribbons, superhelical ropes, hollow and solid micro-/nanospheres. Generally, these structures exhibit enhanced chiroptical properties when compared to their monomeric counterpart. In this context, we report on the tetraphenylsilole and TPE derivatives with side-chains bearing an enantiomerically pure chiral units readily assembled into superhelical ropes upon aggregation, which displayed large CPL dissymmetry factors (gem) of –0.32 – a record for purely organic chiral materials.

Paper Details

Date Published: 23 September 2016
PDF: 18 pages
Proc. SPIE 9940, Liquid Crystals XX, 99400A (23 September 2016); doi: 10.1117/12.2239994
Show Author Affiliations
Hongkun Li, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Shenzhen Univ. (China)
Soochow Univ. (China)
Bing Shi Li, Shenzhen Univ. (China)
Ben Zhong Tang, Hong Kong Univ. of Science and Technology (Hong Kong, China)

Published in SPIE Proceedings Vol. 9940:
Liquid Crystals XX
Iam Choon Khoo, Editor(s)

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