Inverted Circularly Polarized Luminescence Behavior Induced by Helical Nanofibers through Chiral Co-Assembly from Achiral Liquid Crystal Polymers and Chiral Inducers.
basic_science · Level V
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- Record sourced from PubMed, PMID 35142484.
- Also identified by DOI 10.1021/acsnano.1c11011.
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Abstract
Chiral supramolecular assembly can provide a powerful strategy for developing circularly polarized luminescence (CPL)-active materials by forming helices or superhelices into single or multiple components. Herein, we chose three achiral liquid crystal polymers (<b>LC-P1/P2</b>/<b>P3</b>) and chiral binaphthyl-based inducers (<i><b>R/S</b></i><b>-M</b>) with anchored dihedral angles to construct chiral co-assemblies and explore the induced CPL behavior from pyrenyl (Py) emitters in achiral LC polymers through the regulation of helical nanofibers during the supramolecular co-assembly process. Most interestingly, chiral co-assembly <b>(</b><i><b>R/S-</b></i><b>M)</b><sub><b>0.1</b></sub><b>-(P3)</b><sub><b>0.9</b></sub> emitted an inverted blue-colored CPL signal during thermal annealing treatment at the glass transition temperature due to the flexible main chain of the LC polymer (<b>LC-P3</b>). The strongest blue-colored CPL emission for the <b>(</b><i><b>R/S-</b></i><b>M)</b><sub><b>0.1</b></sub><b>-(P3)</b><sub><b>0.9</b></sub> spin-coated film (λ<sub>em</sub> = 455 nm, |<i>g</i><sub>em</sub>| = 6.47 × 10<sup>-2</sup>, Φ<sub>F</sub> = 48.5%) could be detected by using thermal annealing treatment at 105 °C.