Issue 25, 2023

Cascade energy transfer boosted near-infrared circularly polarized luminescence of nanofibers from an exclusively achiral system

Abstract

We constructed chiral supramolecular nanofibers for light harvesting based on symmetry-breaking, and these can generate near-infrared circularly polarized luminescence (CPL) with high dissymmetry factor (glum) through a synergistic energy transfer and chirality transfer process. Firstly, the achiral molecule BTABA was assembled into a symmetry-breaking assembly using a seeded vortex strategy. Subsequently, the chiral assembly can endow the two achiral acceptors, Nile Red (NR) and Cyanine 7 (CY7), with supramolecular chirality, as well as chiroptical properties. CY7 can reach an excited state and emit near-infrared light through a cascade energy transfer process from BTABA to NR and then to CY7, but cannot directly acquire energy from the excited BTABA. Significantly, the near-infrared CPL of CY7 can be obtained with a boosted glum value of 0.03. This work will provide a deep insight into the preparation of materials with near-infrared CPL activity from an exclusively achiral system.

Graphical abstract: Cascade energy transfer boosted near-infrared circularly polarized luminescence of nanofibers from an exclusively achiral system

Supplementary files

Article information

Article type
Paper
Submitted
01 Apr 2023
Accepted
24 May 2023
First published
25 May 2023

Nanoscale, 2023,15, 10820-10825

Cascade energy transfer boosted near-infrared circularly polarized luminescence of nanofibers from an exclusively achiral system

C. Xiao, C. Li, K. Huang, P. Duan and Y. Wang, Nanoscale, 2023, 15, 10820 DOI: 10.1039/D3NR01515G

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