Dynamically stable and amplified circularly polarized excimer emission regulated by solvation of chiral co-assembly process

Yuxia Zhang, Hang Li, Zhongxing Geng, Wenhua Zheng (), Yiwu Quan () and Yixiang Cheng ()
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Yuxia Zhang: Nanjing University
Hang Li: Nanjing University
Zhongxing Geng: Nanjing University
Wenhua Zheng: Nanjing University
Yiwu Quan: Nanjing University
Yixiang Cheng: Nanjing University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Chiral supramolecular assembly has been assigned to be one of the most favorable strategies for the development of excellent circularly polarized luminescent (CPL)-active materials. Herein, we report our study of an achiral boron-containing pyrene (Py)-based chromophore (PyBO) as a circularly polarized excimer emission (CPEE) dye induced by chiral co-assemblies containing chiral binaphthyl-based enantiomers (R/S-M). Chiral co-assembly R/S-M-(PyBO)4 fresh film spin-coated from toluene solution can exhibit orderly nanofibers and strong green CPEE (λem = 512 nm, gem = ±0.45, ΦFL = 51.2 %) resulting from an achiral PyBO excimer. In contrast, only a very weak blue CPL was observed (λem = 461 nm, gem = ± 0.0125, ΦFL = 19.0 %) after 187 h due to PyBO monomer emission as spherulite growth. Interestingly, this kind of chiral co-assembly R-M-(PyBO)4-T film from tetrahydrofuran (THF) solution retains uniform morphology and affords the most stable and strongest CPEE performance (λem = 512 nm, gem = + 0.62, ΦFL = 53.3 %) after 10 days.

Date: 2022
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DOI: 10.1038/s41467-022-32714-1

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