Light‐Responsive Luminescent Materials for Information Encryption Against Burst Force Attack

Abstract

Optical encryption with easy operation, multichannel and high security has been one of the most significant technologies for information security. Stimuli‐responsive luminescent materials have emerged as an ideal candidate for optical encryption, owing to its smart responsive property and high security. Herein, a type of light‐responsive multicolor luminescent materials for high‐security information encryption, which are fabricated by combining sensitizer, consumption unit, and emitter is developed. Different types of sensitizers to achieve different stimulus light responses, and multicolor light‐responsive luminescent can be obtained by varying the composition of perovskite nanocrystals emitter can be selected. Both stimulus light and emission color can be used as distinguishable encoding dimensions, which enable multiplexed encoding with high capacity and complexity. Importantly, the controllable consumption can be manipulated by varying the concentration of consumption unit, so the programmed information encoded in different channels can be selectively read and erased simultaneously by varying stimulus light. The method makes the encryption information highly resistive to brute force trial‐and‐error attacks, which achieves high security level of information protection.

Dynamic Anticounterfeiting Through Novel Photochromic Spiropyran-Based Switch@Ln-MOF Composites

“…Liu’s group achieved desirable piezochromic luminescent materials by inserting a nonemissive molecule into a D–A (donor and acceptor) binary cocrystal, regulating intermolecular interactions between the donor and the acceptor . Similarly, Li’s group obtained light-responsive multicolor luminescent materials by combining a sensitizer, a consumption unit and an emitter, which is promising for application in high-security information encryption . However, these stimuli-responsive luminescent materials usually demand some required chemical reactions or need an external stimulus, which is not friendly to the environment and human beings and not convenient for suppliers and consumers who have no professional chemical knowledge to be able to carry out anticounterfeiting operations.…”

“…25 Similarly, Li's group obtained light-responsive multicolor luminescent materials by combining a sensitizer, a consumption unit and an emitter, which is promising for application in high-security information encryption. 26 However, these stimuli-responsive luminescent materials usually demand some required chemical reactions or need an external stimulus, which is not friendly to the environment and human beings and not convenient for suppliers and consumers who have no professional chemical knowledge to be able to carry out anticounterfeiting operations. Worse still, some external responses are irreversible.…”

Wide-Range Time-Dependent Color-Tunable Light-Response Afterglow Materials via Absorption Compensation for Advanced Information Encryption

“…After determining the composition of light-responsive afterglow materials and colored materials, the feasibility of absorption compensation was further studied. As we all know, Lambert–Beer’s law defines absorbance, A , as given in eq where I 0 is the intensity of the incident light, I T is the intensity of the transmitted light, ε is the molar extinction coefficient (L mol –1 cm –1 ), c is the concentration (mol L –1 ), and l is the optical path (cm). Transmittance, T , is defined as I T / I 0 .…”

“…After determining the composition of light-responsive afterglow materials and colored materials, the feasibility of absorption compensation was further studied. As we all know, Lambert−Beer's law defines absorbance, 49 A, as given in eq 1…”

Triple optically modulated and enzymatically responsive organic afterglow materials for dynamic anti-counterfeiting

“…For example, as claimed by the Global Brand Counterfeiting Report 2018, the total global economic losses from counterfeiting reached $1.2 trillion in 2017 and rocketed to $1.82 trillion in 2020. 1 In response to the severe situation, many security labels, such as topographical markers, 6 luminescent labels, [7][8][9][10] luminescent magnetic labels, [11][12][13] and plasmonic security taggants, 4,14,15 have been developed to protect valuable documents and brands. Among these, luminescence anti-counterfeiting is one of the commercialized techniques with benefits of relatively high photostability, multicolor, facile design, and easy to visualize by eye or read using an authentication tool such as a digital camera or a spectrometer.…”