Abstract
Versatile stimuli-responsive circularly polarized luminescent (CPL) materials have potential applications in information storage, security encryption, and intelligent displays. In this study, the Z/E isomerization of ultraviolet (UV)-photosensitive achiral α-cyanostilbene derivative was used as an achiral dichroic dye (Switch) to drive the controllable CPL-active response in cholesteric liquid crystals (CLCs). Under irradiation by 365 nm UV light, the resulting CLCs-Z-Switch underwent a Z-to-E configuration isomerization as CLCs-E-Switch, accompanied by a decrease in its dichroic order parameter (SF value) from 0.15 to 0.07. Although the quantum yield (QY) of CLCs-E-Switch increased from 8.1% (CLCs-Z-Switch) to 16.8%, the corresponding glum values of CPL emission decreased from +0.55/−0.57 to +0.37/−0.39 due to a decrease in the order of helical arrangement of E-Switch in E7 media. This study enables photosensitive CLCs-Switch to be applied for optical information storage devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21975118, 92156014, 52373188).
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Chen, Y., Li, Y., Li, H. et al. Controllable CPL response driven by achiral UV-photosensitive dichroic dye through cholesteric liquid crystals. Sci. China Chem. 67, 1250–1255 (2024). https://doi.org/10.1007/s11426-023-1846-0
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DOI: https://doi.org/10.1007/s11426-023-1846-0