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Recent Advances in Colloidal Photonic Crystal-Based Anti-Counterfeiting Materials

1
Center for Composite Material and Structure, Harbin Institute of Technology, Harbin 150001, China
2
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(8), 417; https://doi.org/10.3390/cryst9080417
Received: 27 July 2019 / Revised: 9 August 2019 / Accepted: 10 August 2019 / Published: 12 August 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
Colloidal photonic crystal (PC)-based anti-counterfeiting materials have been widely studied due to their inimitable structural colors and tunable photonic band gaps (PBGs) as well as their convenient identification methods. In this review, we summarize recent developments of colloidal PCs in the field of anti-counterfeiting from aspects of security strategies, design, and fabrication principles, and identification means. Firstly, an overview of the strategies for constructing PC anti-counterfeiting materials composed of variable color PC patterns, invisible PC prints, and several other PC anti-counterfeiting materials is presented. Then, the synthesis methods, working principles, security level, and specific identification means of these three types of PC materials are discussed in detail. Finally, the summary of strengths and challenges, as well as development prospects in the attractive research field, are presented. View Full-Text
Keywords: colloidal photonic crystals; tunable photonic band gaps; anti-counterfeiting colloidal photonic crystals; tunable photonic band gaps; anti-counterfeiting
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Pan, M.; Wang, L.; Dou, S.; Zhao, J.; Xu, H.; Wang, B.; Zhang, L.; Li, X.; Pan, L.; Li, Y. Recent Advances in Colloidal Photonic Crystal-Based Anti-Counterfeiting Materials. Crystals 2019, 9, 417.

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