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

Abstract

Luminescent anti-counterfeiting is one of the extensively used strategies to combat the growing serious global forgery issue in modern society. Although many luminescent security labels have been developed, majority of...

o-Phenylenediamine Doped Tin-Based Two-Dimensional Perovskite for Light-Emitting Device Applications

“…The results show in the 13 C NMR spectra that the doped perovskite has three more chemical shifts than the undoped. The chemical shift at 138 ppm belongs to the aromatic ring and the observed band at 114 and 108 ppm is due to aromatic CC. , In the 13 C NMR spectra, this further confirms the doping of oPD into 2D tin-based perovskite. From the XRD, high-resolution TEM and NMR spectra we deduced that the short-chain oPD substituted part of the long-chain organic oleylamine ligands resulting in a smaller interplanar spacing.…”

Multifaceted luminescence in lanthanide-activated microrods for advanced multicolor anti-counterfeiting

“…Optical anti-counterfeiting, in comparison to conventional techniques like watermarking, barcode, and RFID, offers distinct advantages, including heightened efficiency, streamlined design, and adaptable identification facilitated by versatile excitation modes. [1][2][3][4][5] Recent years have witnessed significant advancements in photoluminescent materials intended for optical anti-counterfeiting, including lanthanide-doped luminescent materials, [6][7][8][9] carbon quantum dots, 10,11 perovskite nanocrystals, [12][13][14] and metal-organic frameworks (MOFs), [15][16][17] among others. As the contemporary standards for information security continue to escalate, there is an increasing demand for luminescent materials that can operate in multiple modes.…”

Dynamic Fluorescence Materials Based on Naphthalimide-Functionalized Silica Aerogels and Applications in Advanced Information Encryption

“…Therefore, in the field of production, manufacturing, and sales, the application of the anticounterfeiting technology is becoming more and more obvious. − Common anticounterfeiting technologies include laser-based authentication, QR code verification, nanotechnology-based security features, chemical anticounterfeiting measures, fluorescent anticounterfeiting, and so on. Among these, fluorescent anticounterfeiting materials are widely explored because of their remarkable visibility, multilayer protection, and user-friendliness, which provide powerful anticounterfeiting measures for commodities and documents. − However, most fluorescent anticounterfeiting materials are based on their static features or signals, which greatly limits the encryption of advanced information. , In view of this, materials that can be switched to multiple states under external stimuli as needed would be promising candidates. These fluorescent patterns show dynamic color change with time after being exposed to external stimuli and show a vivid display of encrypted information, so they have a higher security level because of the increase in anticounterfeiting dimension. − …”

“…10−13 However, most fluorescent anticounterfeiting materials are based on their static features or signals, which greatly limits the encryption of advanced information. 14,15 In view of this, materials that can be switched to multiple states under external stimuli as needed would be promising candidates. These fluorescent patterns show dynamic color change with time after being exposed to external stimuli and show a vivid display of encrypted information, so they have a higher security level because of the increase in anticounterfeiting dimension.…”