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Abstract Stimuli‐responsive circularly polarized luminescence (CPL) materials based on cholesteric liquid crystal (CLC) platforms show great promise for applications in information encryption and anticounterfeiting. In this study, we constructed a mercury ion‐responsive CPL system in CLCs by controlling the conjugation degree of axially chiral binaphthyl derivatives. Two chiral binaphthyl derivatives ( R / S ‐1 and R / S ‐2) were initially used as chiral dopants to demonstrate that CPL inversion ( g lum values from 0.5/‐0.44 to −0.53/0.48) in CLCs could be achieved by modulating the conjugation degree of the chiral binaphthyls. Based on this concept, the thioacetal binaphthyl R ‐2S was developed and used as a mercury‐responsive chiral dopant in CLCs. Under Hg ion treatment, the CPL sign inverted ( g lum value changed from 0.22 to −0.29) due to the transformation of the thioacetal into an aldehyde group. Additionally, the mercury ion‐responsive CPL material was applied in information encryption.
Li et al. (Mon,) studied this question.
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