Stimuli-Responsive Inks Based on Perovskite Quantum Dots for Advanced Full-Color Information Encryption and Decryption

Abstract

For data security applications, the use of fluorescent inks has become the most promising approach because of their convenience and low cost. However, traditional fluorescent inks are usually visible either under ambient light or UV light, whereas the improved stimuli-responsive inks are restricted to a single color. For the first time, full-color stimuli-responsive inks for information coding, encryption, and decryption are reported, which rely on the facile preparation and conversion of perovskite quantum dots. The information printed by the halide salt solution is invisible under ambient and UV light but becomes readable under UV light after spraying a unique developer. Besides, the primitive information can be stored for many years, even decades. Even after the decryption process, it still can be stored for at least several weeks. Most importantly, using butyl amine and acetic acid as encryption and decryption reagents, respectively, can switch off/on the luminescence. In this way, the printed information can be encrypted and decrypted, which shows great potential for information security applications.

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

“…In our daily lives, encryption and anticounterfeiting are quite important in the field of information security, where it protects banknotes, valuable documents, diploma, certificates, or luxury items. [245] Many research groups have reported perovskite nanocrystals for encryption, decryption, and information coding application, which results from their stimuli-response photoluminescence properties such as bright PL, high PL quantum Reproduced with permission. [178] Copyright 2019, American Chemical Society.…”

“…In our daily lives, encryption and anticounterfeiting are quite important in the field of information security, where it protects banknotes, valuable documents, diploma, certificates, or luxury items. [ 245 ] Many research groups have reported perovskite nanocrystals for encryption, decryption, and information coding application, which results from their stimuli‐response photoluminescence properties such as bright PL, high PL quantum yields (QY), wide color gamut, and anion‐exchange reaction. Li and co‐workers reported a hybrid MAPbBr 3 NCs@Pb‐MOF as a successful platform for security protection applications with various high‐resolution patterns using inkjet‐printing technique.…”

Advances in Inkjet‐Printed Metal Halide Perovskite Photovoltaic and Optoelectronic Devices

“…The approach can be used for different halides and color perceptions, e.g., for anticounterfeiting applications. Sun et al demonstrated an approach to realize confidential information protection based on the anion‐exchange reaction of perovskite QDs . Luminescent CsPbX 3 QDs can be rapidly obtained from invisible halide salts, by simply reacting with a colorless developer, e.g., cubic CsPbCl 3 QDs.…”

Dynamic anti-counterfeiting security features using multicolor dianthryl sulfoxides

“…[21][22][23][24][25] Quantum and carbon dots and other nanomaterials such as perovskite nanocrystals and metal-organic frameworks (MOFs) have also been utilized due to their unique emission characteristics such as upconversion, temperature-dependent and triple-mode emission. [26][27][28][29][30][31][32][33][34][35] Typical covert designs employ small molecules that emit a single color, and in rare cases show dual-color emission. [36][37][38][39][40][41][42][43] A signicant disadvantage, however, to implementing uorescent response as an anti-counterfeiting tool is their predictable output, which can be imitated by uorescent molecules having similar emission characteristics.…”