Recent advances in circularly polarized luminescent materials based on light regulation of cholesteric liquid crystals
Circularly polarized luminescence(CPL)has potential applications in the fields of chiral fluorescent probes,CP organic light-emitting diodes,and optical anti-counterfeiting.To expand the application range of CPL materials,researchers have begun to focus on stimulation-responsive CPL active materials.Cholesteric liquid crystal(CLC)has become an ideal choice for construction stimulus-responsive CPL active materials due to its highly ordered chiral environment and excellent tunability.Currently,CLC-based photo-responsive CPL materials have been widely developed,and these materials can achieve CPL signal response in multi-component systems.This review focuses on the research progress of photo-regulation of CPL in CLC,and summarizes three strategies for CPL regulation:(1)The CPL signal of CLC is regulated by the chirality or helix changes of photo-switches molecules during light modulation;(2)The CPL signal of CLC is regulated by the chiral competition between chiral photo-switches and chiral dopants;(3)The CPL signal is regulated by the changes of order parameter value of non-chiral dichroic dyes driven by light modulation.This review is expected to explore CPL regulation techniques based on photo-responsive CLC further to promote its application in a wider field.
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维普
