Quadruple Anti‐Counterfeiting Retroreflective Structural Color Films

Abstract

While structural color materials are widely exploited in anti‐counterfeiting applications, it still remains a challenge to develop advanced and multifunctional structural colors for new anti‐counterfeiting technologies. Herein, a novel patterned retroreflective structural color film (PRSCF) with quadruple anti‐counterfeiting capacities is reported based on the changes in iridescent and non‐iridescent colors due to total internal reflection and interference mechanisms, reversible thermal‐responsive patterns owing to the shape memory effect, and reversible decryption and encryption of the patterns due to the surface wettability difference. This quadruple anti‐counterfeiting PRSCF greatly improves the security level and may find important potentials in precious artworks and displays.

Responsive Structural Colors Derived from Geometrical Deformation of Synthetic Nanomaterials

“…Mechanical force [75,265] Shape memory Total internal reflection Photonic paper and anticounterfeiting…”

Binary temporary photo-response of ZnSe:Mn/ZnS quantum dots for visible time-domain anti-counterfeiting

“…In order to eliminate the global problems of counterfeiting and forgery, which pose security and economic threats to individuals, companies and society, [1][2][3][4][5] the design of new anti-counterfeiting materials is in high demand for protecting important and valuable items. Conventionally, luminescent materials with visualized colors and tunable multi-peak emissions have been developed and have played a crucial role in anti-counterfeiting, including semiconductor nanocrystals, 6,7 perovskite quantum dots (QDs), [8][9][10] rare-earth doped nanocrystals, 11,12 carbon dots [13][14][15] and other hybrids.…”

Security labeling and optical information encryption enabled by laser-printed silicon Mie resonators

“…Forgery of medical drugs, luxury items and high-tech products remains a serious social-threatening worldwide challenge that stimulates an active search for novel practically relevant anticounterfeiting strategies. 1,2 Common commercially adopted solutions include ink-jet printing-based tags, 3,4 barcodes, 5,6 watermarks, 7 structural color images 8,9 and holograms. 10 However, the mentioned well-known security labels are easily duplicable, thus they do not provide a sufficient protection degree.…”