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

Ruochen Lan; Jinying Bao; Zhaozhong Li; Zizheng Wang; Chenjie Song; Chen Shen; Rui Huang; Jian Sun; Qian Wang; Lanying Zhang; Huai Yang

doi:10.1002/anie.202213915

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

Angew Chem Int Ed Engl. 2022 Dec 12;61(50):e202213915. doi: 10.1002/anie.202213915. Epub 2022 Nov 15.

Authors

Ruochen Lan^{1

2}, Jinying Bao¹, Zhaozhong Li³, Zizheng Wang¹, Chenjie Song⁴, Chen Shen⁵, Rui Huang³, Jian Sun¹, Qian Wang¹, Lanying Zhang^{1

6}, Huai Yang^{1

6}

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering&School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.
² Institute of Advanced Materials, Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang, 330022, P. R. China.
³ School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
⁴ Department of Ophthalmology, Beijing Anzhen Hospital, Capital Medical University, Beijing, 100029, P. R. China.
⁵ China National Machinery Industry Corporation (Sinomach), Beijing, 100080, P. R. China.
⁶ Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing, 100871, P. R. China.

PMID: 36259390
DOI: 10.1002/anie.202213915

Abstract

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

Keywords: Cholesteric Liquid Crystalline Network; Humidity-Responsive; Information Encryption; Photo-Rewritable Fluorescence; Programmable Structural Color.

Abstract

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