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A self-assembled nanohelix for white circularly polarized luminescence via chirality and energy transfer

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Abstract

Chiral nanostructures and their optical activity have been attracting great interest. Here, we designed an enantiomer bolaamphiphile containing a naphthalene moiety (bola-1) and an alkyl spacer, and investigated its self-assembly as well as optical activity. It was found that the compound could form gels in various organic or mixed organic/water mixtures. In mixed DMSO/water, it formed a nanohelix. Due to the fluorescent nature of the naphthyl group, the nanohelix showed both CD and circularly polarized luminescence (CPL). When three achiral fluorescent molecules, pyrene-1-carboxylic acid (D2), rhodamine 110 (D3) and rhodamine B (D4), were incorporated into the helical structures formed by bola-1, the nanohelix could be retained and the CPL from the dye molecules could be induced. In addition, an energy transfer occurred between the bola-1 nanohelix and the dyes. By mixing the different emission dyes with the bola-1 in an appropriate ratio, white CPL was obtained. It was found that the dissymmetry factor of the white CPL could be increased through energy transfer. This work provided a new convenient and efficient way for obtaining white CPL.

Graphical abstract: A self-assembled nanohelix for white circularly polarized luminescence via chirality and energy transfer

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Article information


Submitted
30 Dec 2019
Accepted
28 Feb 2020
First published
02 Mar 2020

Nanoscale, 2020, Advance Article
Article type
Paper

A self-assembled nanohelix for white circularly polarized luminescence via chirality and energy transfer

S. Ma, J. Jiang, Z. Liu, Y. Jiang, Z. Wu and M. Liu, Nanoscale, 2020, Advance Article , DOI: 10.1039/C9NR10946C

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