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Orthogonally Integrating Programmable Structural Color and Photo-rewritable Fluorescence in Hydrazone Photoswitch-bonded Cholesteric Liquid Crystalline Network.

Design and fabrication of advanced security label showing superior performance in information storage and data encryption has attracted tremendous scientific interests. Especially, multifunctional optical labels capable of storing distinct information in different modes are highly demanded but challenging. Here, a fluorescent cholesteric liquid crystalline network (CLCN) film with programmable visible patterns and photo-rewritable fluorescent patterns was judiciously designed and prepared. The visible patterns were fixed by helical network and the colors of visible patterns were tunable over visible range by changing relative humidity (RH). The fluorescence patterns originated from dynamic isomerization of fluorescent hydrazone molecules, exhibiting highly thermal stability and switching-ability controlled by remote light irradiation. The orthogonal construction of visible pattern and fluorescent pattern enabled the novel CLCN to encrypt distinctive dynamic information in reflective mode and in emissive mode, indicating the potential in applications including anti-counterfeiting, information storages and encryptions.