POLYMER
·
2025
·
IF 4.5
Ahmed Olalekan Omoniyi,Mingda Yang,Wei Bai,Olayinka Oderinde,Fengwei Gao,Yang Zhou,Jianfu Zhang,Yuanfeng Wu,Zhongmin Su
Traditional encryption technologies using single-fluorescent materials are increasingly vulnerable to attacks due to their predictable responses to stimuli. Furthermore, conventional waterborne polyurethane (WPU) film fabrication methods, such as casting, suffer from long drying times and inconsistent thickness, limiting scalability for advanced applications. To address these issues, we developed cephalopod-inspired WPU composite films that integrate 6,7-dihydroxy coumarin (6,7-CU) and perylene tetracarboxylic acid (PTCA) as fluorophores in segregated layers. This colloidal system achieves good emulsion stability and interfacial interactions, which play a crucial role in the films' complex functionality. The dyes’ hydroxy and carboxylic acid groups strengthen both optical properties and mechanical strength of WPU, achieving a tensile strength of 24 MPa in a 100 μm thin film. Using the electrochemical demulsification-induced fast solidification (DIFS) method, we achieved rapid drying and uniform film formation, overcoming the limitations of traditional casting. This method leverages controlled interfacial dynamics to produce films with sophisticated multicolor responses and improved encryption complexity. Density functional theory (DFT) calculations further reveal the films' stimuli-responsiveness, providing insights into the influence of interfacial mechanisms on their reversible color transformations under UV light and pH changes. Applications in data engraving and QR code labeling demonstrate the films' potential in secure information encryption and anti-counterfeiting technologies.
研究领域:
材料科学
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化学工程
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光学
·
密码学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Teng Zhang,Huijuan Yuan,Pengcheng Wu,Heyi Yang,Fangyi Zhao,Qinan Mao,Meijiao Liu,Jiasong Zhong
Information storage and encryption are the key technologies for modern information transmission. However, most optical information storage technologies based on long persistent luminescent (PersL) only have one fixed response mode, which is easy to imitate, limiting their security in advanced information storage and encryption applications. Besides, the cost of rare earth-doped PersL materials restricts their wide application. Therefore, exploring non-rare earth-doped multimode PersL phosphors is an urgent and important topic. In this work, a novel SrGa2Ge2O8:Cu2+ (SGGO:Cu2+) phosphor with yellow–green PersL at 535 nm and near-infrared emission excited by ultraviolet light is designed. Furthermore, the two luminescence peaks of SGGO:0.007Cu2+ exhibit discriminable thermal quenching characteristics. Prominently, an outstanding photochromic performance from white to gray within 60 s under 254 nm light is found. The phosphor also has good bleaching and recovery ability under the irradiation of 450 nm blue light or heating treatment. Finally, the yellow–green PersL combined with thermochromism and reversible white-to-gray photochromism provides a promising multimode luminescent material, demonstrating the potential for multimode optical information storage and encryption applications.
研究领域:
材料科学
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光学工程
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信息安全
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2025
·
IF 6.4
Qing Han,Hangqing Xie,Jiayou He,Fei Zhou,Jing Xu,Jiadi Lian,Shiqing Xu
For anti-counterfeiting and encryption, there is a scarcity of photoluminescent (PL) stimuli-responsive materials that combine weather resistance, reversibility, color tunability, and dehydration-stress resistance. Here, we report water-triggered, thermally reversible sulfur quantum dots (SQDs) for dynamic anti-counterfeiting. Red phosphorescent SQDs (R-SQDs) rapidly switch to blue fluorescent SQDs (B-SQDs) upon water contact and revert to R-SQDs upon heating (400–700 °C). This reversible luminescence switching originates from the transformation of the SQDs’ environment: they exhibit triplet-state phosphorescence when embedded in a rigid sulfate matrix but show singlet-state fluorescence when dispersed in water. Both forms demonstrate excellent weather resistance and can be stored for one year under ambient conditions. Moreover, the transformation is highly specific to water, as other solvents do not induce this change. This work demonstrates an SQD-based material capable of encryption-decryption-re-encryption cycles through reversible PL color/lifetime switching, offering a robust platform for advanced dynamic anti-counterfeiting.
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 16
·4022-4029
·
IF 7.779
Peng Zhang,Wanying Xie,Zhenbin Wang,Zenggang Lin,Xiuxiang Huang,Zhenghua Ju,Weisheng Liu
Long-persistent luminescence (PersL) materials have shown great promise on account of their diverse utilization in anticounterfeiting and encryption. Nevertheless, time-dependent dynamic multicolor afterglow is rarely reported, especially for single-component oxide-based materials. In this work, a series of LiGa5O8:Eu3+/Tb3+ phosphors exhibit time-dependent dynamic multicolor afterglow from blue to red or green over several seconds after ceasing the excitation. Both experimental and computational data confirm that the color evolution results from different energy transfer processes between traps and luminescent centers. The processes are probably controlled by thermally activated exciton diffusion and the electron tunneling effect. This dynamic multicolor afterglow of LiGa5O8 phosphors allows their applications in anticounterfeiting and encryption with high security levels.
研究领域:
材料科学
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光学
·
加密技术
·
防伪技术
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Jianlei Lu,Chujun Ni,Xin Wen,Xin Guan,Baoyi Wu,Nan Hai,Yang Li,Jiawei Zhang
Inspired by sign language, responsive materials construct an efficient encryption channel via programmable shape morphing, offering a potential solution to the decryption vulnerabilities of existing optical anticounterfeit. However, these pioneering approaches often fail to conceal morphological information due to predictable shape-shifting, let alone achieve higher-level encryption such as multiple and transient information storage. Herein, we report a schizophrenic shape memory hydrogel that can be applied for transient information encryption. In particular, two opposite shape fixation mechanisms, heating-induced aggregation of poly(acrylic acid)-Ca2+ (PAAc-Ca2+) coordination and cooling-induced clustering of alkyl chain-modified poly(vinyl alcohol) (PVA-C6), are coupled in one system. Through a two-step shape programming process involving alternating heating and cooling, complex morphological information can be hidden within an initially simple shape. During its temperature-triggered shape morphing process, the hydrogel rapidly undergoes shape-shifting to reveal the hidden morphological information, followed by an onset recovery to erase it, thereby achieving a transient information display. This single-triggered multiple shape-shifting system opens an unprecedented pattern-independent channel for existing encryption strategies and can motivate the development of advanced anticounterfeiting materials with integrated multifunctionality.
研究领域:
材料科学
·
生物医学工程
·
加密技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）