Carbon Dots‐in‐EuAPO‐5 Zeolite: Triple‐Emission for Multilevel Luminescence Anti‐Counterfeiting

Abstract

achieving more than two kinds of luminescence in a single anti-counterfeiting label by changing stimuli factors. At present, many MlLA strategies have been demonstrated by simultaneously adopting different stimuli factors to adjust the luminescence of security labels, such as two or more excitation sources with diverse emission wavelengths or powers, [2][3][4][5] chemical reagents and excitation light, [6][7][8][9] temperature and excitation light, [10][11][12] rotation and excitation light, [13] or mechanical force and excitation light, [14,15] or even three kinds of stimuli factors, such as mechanical force, temperature, and excitation light. [16] However, these complicated stimuli factors make the anti-counterfeiting process become tedious, limiting their actual applications. Therefore, it is highly desired to develop novel anti-counterfeiting materials that can easily realize multiple luminescence under the regulation of simple and common stimuli.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202103374.

Facile Synthesis of Multi-Emission Nitrogen/Boron Co-Doped Carbon Dots from Lignin for Anti-Counterfeiting Printing

“…The NB-CDs derived from lignin with the intriguing merit of triple-fluorescence emission show great promise in advanced multi-level anti-counterfeiting applications. Besides, the fluorescence stability of CD material is known as a prerequisite for practical optical applications [ 9 , 10 ]. As seen in Figure S1a–c , the CDs-3 selected as a typical material is subjected to different treatments for the stability test.…”

“…To address the above challenge, the multi-emission CD anti-counterfeiting materials have been developed for achieving multiple kinds of fluorescence in a single security label by changing stimuli factors, thus realizing advanced multi-level optical anti-counterfeiting [ 9 , 10 , 11 ]. Wang et al [ 12 ] prepared dual-emission CDs with yellow/orange fluorescence from phloroglucinol dihydrate, boric acid and ethylenediamine by a one-step microwave method, which exhibited a high solid-state fluorescence QY of 39.0%.…”

“…Li et al [ 13 ] prepared dual-emission CDs through facile hydrothermal carbonization of alizarin carmine as the precursor, exhibiting attractive blue/red dual-emissive fluorescence at 430 and 642 nm. Yu et al [ 9 ] prepared CDs from α-lipoic acid and ethylenediamine and in situ introduced them into Eu-substituted AlPO4-5 zeolite. The as-prepared composite exhibited triple-emission fluorescence of pink, blue and green color at 254 and 365 nm excitation, which were successfully applied in multilevel optical anti-counterfeiting that was hard to copy.…”

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

“…43 These examples show that the more information a material can carry, the higher will be its encoding capacity and level of security. Although significant progress in optical encryption based on dual-/multi-mode responses of the composite afterglow materials under various external stimuli (such as excitation light, [44][45][46][47] heat, 48 mechanical force, 49 chemical reagents, 50 etc.) has been made, achieving all these properties in a single material remains a major challenge.…”

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. [16][17][18] CsPbBr 3 @Cs 4 PbBr 6 /SiO 2 nanocrystals were reported and applied for multiple modal anticounterfeiting codes, with simultaneous triple-modal fluorescent characteristics under the excitation of thermal, ultra-violet (UV) and infrared light.…”