Geminate labels programmed by two-tone microdroplets combining structural and fluorescent color

Creating a security label that carries entirely distinct information in reflective and fluorescent states would enhance anti-counterfeiting levels to deter counterfeits ranging from currencies to pharmaceuticals, but has proven extremely challenging. Efforts to tune the reflection color of luminesce...

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Bibliographic Details
Published in:Nature communications 2021-01, Vol.12 (1), p.699-699, Article 699
Main Authors: Qin, Lang, Liu, Xiaojun, He, Kunyun, Yu, Guodong, Yuan, Hang, Xu, Ming, Li, Fuyou, Yu, Yanlei
Format: Article
Language:English
Subjects:
140/131
639/301/1019/1022
639/301/923/919
639/638/298/398
Cholesteric liquid crystals
Color
Counterfeiting
Currencies
Encryption
Fluorescence
Humanities and Social Sciences
Inks
Labels
Microfluidics
multidisciplinary
Science
Science (multidisciplinary)
Security
Superstructures
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Summary:Creating a security label that carries entirely distinct information in reflective and fluorescent states would enhance anti-counterfeiting levels to deter counterfeits ranging from currencies to pharmaceuticals, but has proven extremely challenging. Efforts to tune the reflection color of luminescent materials by modifying inherent chemical structures remain outweighed by substantial trade-offs in fluorescence properties, and vice versa, which destroys the information integrity of labels in either reflection or fluorescent color. Here, a strategy is reported to design geminate labels by programming fluorescent cholesteric liquid crystal microdroplets (two-tone inks), where the luminescent material is ‘coated’ with the structural color from helical superstructures. These structurally defined microdroplets fabricated by a capillary microfluidic technique contribute to different but intact messages of both reflective and fluorescent patterns in the geminate labels. Such two-tone inks have enormous potential to provide a platform for encryption and protection of valuable authentic information in anti-counterfeiting technology. Creating an enhanced-security-level label that carries entirely distinct information in different optical states has proven challenging. Here, the authors design geminate labels by programming fluorescent cholesteric liquid crystal microdroplets to encrypt fluorescent security information behind colorful reflective patterns.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-20908-y