RSC Advances
·
2020
·Vol. 10
·期 39
·23410-23416
·
IF 3.119
Yanyan Chen,Qi Hu,Qiang Wang,Minghui Yu,Xiaoyu Gong,Shenjie Li,Jin Xiao,Yingjie Guo,Guangyu Chen,Xinyu Lai
With the rapid development of commodity circulation, more attention has been paid to the anticounterfeiting technology of commodities, including stability, universality and ease of distinguishing. The authors report the use of gelatin–chitosan–glycerin/QD nanocomposite-functionalized glue for luminescent anti-counterfeiting labels. As the blend and plasticizer, the addition of chitosan and glycerin effectively improved the flexibility and formability of the gelatin–chitosan–glycerin/QD composite films, which show excellent mechanical properties, including high transparency, luminescence and flexibility, and they are easy to prepare on a large scale, providing certain reference values for new anticounterfeiting technology applying a variety of morphologies.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 18
·11534-11542
·
IF 4.036
Bohan Wang,Zhihao Wang,Peng Mao,Yu Wang
Conventional luminescent materials generally exhibit uni-color and transient emission under UV excitation, which makes them mediocre in the field of anti-counterfeiting. The high-level anti-counterfeiting techniques are always becoming more complicated and in need of multi-color and persistent luminescent materials. Herein, we report a series of β-NaYF4:RE3+ (RE = Sm, Tb, Dy, Pr) persistent luminescent phosphors with multi-color emitting and ultra-long persistent luminescence under the irradiation of X-rays. The effects of doping concentrations of RE3+ on the size, morphology, radioluminescence and afterglow performance of the products are investigated in detail. Hexagonal structured rod-like β-NaYF4:Tb3+ crystals show super strong X-ray response and the afterglow signal lasts for up to seven days after X-rays are turned off. Upon X-rays irradiation, some of the F− ions are expected to escape from the crystal lattice by elastic collisions, leading to the generation of Frenkel defects: the F vacancies and interstitials , which capture electrons and release them slowly to achieve different afterglow emission times. Taking advantages of the extraordinary radioluminescence performance of the β-NaYF4:RE3+ persistent luminescent phosphors, the dynamic anti-counterfeiting patterns that containing rich time-resolved information were successfully designed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 48
·2405161
·
IF 13
Haoqiang Feng,Shitao Shen,Mingliang Jin,Mengjie Xiao,Mengjun Liu,Qilin Zhang,Hongwei Jiang,Zichuan Yi,WenShuai Wu,Guofu Zhou,Lingling Shui
The assembly of colloidal particles into micro-patterns is essential in optics, informatics, and microelectronics. However, it is still a challenge to achieve quick, reversible, and precise assembly patterns within micro-scale spaces like droplets. Hereby, a method is presented that utilizes in-plane dielectrophoresis to precisely manipulate particle assemblies within microscale droplets. The electro–microfluidic particle assembly platform, equipped with ingenious electrode designs, enables the formation of diverse micro-patterns within a droplet array. The tunability, similarity, stability, and reversibility of this platform are demonstrated. The ability to assemble letters, numbers, and Morse code patterns within the droplet array underscores its potential for information encoding. Furthermore, using an example with four addressing electrodes beneath a droplet, 16 distinct pieces of information through electrical stimuli is successfully encoded. This unique capability facilitates the construction of a dynamic electronic token, indicating promising applications in anti-counterfeiting technologies.
研究领域:
微流控技术
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材料科学
·
电子信息学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jia He,Yuming Zang,Huateng Li,Jia Guo,Changchun Wang
The proliferation of counterfeiting necessitates an urgent need for enhanced technique to safeguard the authenticity of sensitive items. Inspired by the elytra of Tmesisternus isabellae beetles, we designed a new synergistic humidity responsive photonic system (SHRPS) for security printing based on high quality photonic paper and active ink. The photonic paper itself is not sensitive to humidity; only the targeted areas activated by the active ink exhibit humidity responsiveness. We investigated factors influencing humidity responsiveness, including monomer composition, pH of active ink, and treatment period. We found the optimal monomer mixture contains 40% acrylic acid, and the active ink pH is 13. We also applied a scalable method to fabricate photonic paper, successfully overcome the challenge of large-scale fabrication of photonic crystals at room temperature. By integrating the perfect pair of SHRPS and inkjet printer, concealed information with various sizes and resolutions can be printed, invisible in ambient humidity and revealed by blowing air, presenting various humidity responsive ability of SHRPS for multilevel information encryption, which opens a new window for security printing system.
研究领域:
材料科学
·
光学
·
生物启发设计
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yiwei Wang,Yue Li,Yongbo Ma,Yachong Liu,Haolin Lu,Huanxin Yang,Wenda Sun,Xiangxiang Chen,Wei Xiong,Libing Zhang,Xiyan Li
Lead-free halide perovskites are highly appealing for optoelectronic applications due to their non-toxic nature and exceptional optical properties. In this study, we report the co-doping of Sb 3+ and Sm 3+ in the rare-earth-based double perovskite Cs 2 NaGdCl 6 . The incorporation of Sb 3+ ions effectively tunes the electronic structure, achieving a photoluminescence quantum yield (PLQY) of up to 87.9 %. The Sb 3+ /Sm 3+ -co-doped Cs 2 NaGdCl 6 exhibits excitation wavelength-dependent emission characteristics, transitioning from blue emission under 260 nm excitation to white emission under 365 nm excitation. Furthermore, the Sb 3+ /Sm 3+ -co-doped Cs 2 NaGdCl 6 material demonstrates advanced multifunctional applications in light-emitting diode (LED) lighting and fluorescence anti-counterfeiting technologies. These findings hold significant implications for the utilization of rare-earth-based double perovskites in optoelectronic devices.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Miao Kong,Ronghui Han,Xiaoyu Guo,Shufen Zhang,Yuang Zhang,Bingtao Tang
The structural color of photonic crystals has garnered considerable attention in the domains of coded information security and anticounterfeiting technology mechanisms. However, most alterations induced by structural color hinge on dynamic regulation triggered by external stimuli, limiting their utility in static settings. Herein, the polyvinylidene fluoride (PVDF) photonic films with a bilayer inverse opal structure are engineered to enable the display and concealment of coded messages contingent on the observer’s viewing angle. The inherent attributes of PVDF polymer confer upon photonic films high stability and flexibility, as confirmed through curling, friction, and tensile tests. Notably, the upper inverse opal structure layer serves as the background, while the bottom inverse opal structure layer functions as the pattern in these PVDF bilayer photonic films. Owing to angle dependence of the pattern layer and the shielding effect of the background layer, the pattern remains concealed at viewing angles above 45° and becomes visible at angles below 30°. These photonic films have been adapted for use in touch-tone numeric keypad protective patches by optimizing particle size and thickness parameters. According to these findings, the coded information security systems based on the angle dependence in highly ordered photonic crystal structures offer substantial promise for applications in static environments.
研究领域:
光学材料
·
信息安全
·
纳米技术
✓ 已验证
DOI
ACS Applied Optical Materials
·
2024
·
IF 0
Ying Li,Chen Xu,Zi-Long Wang,Jia-Zhen Lu,Yi-Chen Shang,Mi-Tang Wang
With the increasing development of advanced optical anti-counterfeiting technologies, it is essential to develop a simple, fast fluorescent material with anti-counterfeiting properties. In this study, we successfully prepared a single-emission CDs-based hydrogel (CDs@PVA-Alg) by introducing carbon dots (CDs) into the interpenetrating network of sodium alginate (Alg) and poly(vinyl alcohol) (PVA) via hydrogen bonding and further cross-linking them with Ln3+ ions to obtain dual-emission Ln-functionalized CDs-based hydrogels (Ln@CDs@PVA-Alg) (Ln = Tb, Eu). By freeze–thawing and ion-exchange methods, the resulting hydrogels displayed extraordinary mechanical properties and significant photoluminescent properties. On one hand, the CDs@PVA-Alg hydrogel demonstrated distinct fluorescence responses to Ln3+ ions. On the other hand, the fluorescence of Tb@CDs@PVA-Alg was quenched by H+ ions and restored in OH– solution. Furthermore, the mechanism of the above fluorescence response was explored in depth, which was further used to create an excellent optical anti-counterfeiting platform that can be utilized for multilevel anti-counterfeiting and repeatable information loading. By changing the excited light and chemical reagent, these materials enable versatile operations such as encryption, decryption, decoding, loading, and unloading of a wide range of information. This study not only supplies a representative example of the fabrication of dual-emitting Ln@CDs@PVA-Alg hydrogels but also investigates their potential application as smart polymeric gels with multifunctionality.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
DOI
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 13
·2300097
·
IF 4.6
Yayuan Liu,Fuyue Tian,Jing Hu,Nanying Ning,Bing Yu,Ming Tian
Intelligent fluorescent coatings have received widespread attention in the encryption technique field such as anti-counterfeit, while the traditional fluorescent coatings are easy to be damaged by external force. In this study, the fluorescent and self-healing anti-counterfeit coatings are prepared after rational molecular design. Two polymers containing fluorescent groups, including polyurethane containing the anthracene (AN) side group and polyimide containing the naphthalenediimide (NDI) structure are synthesized to realize multiple color changes with fluorescence through simply blending. Due to the overlapping fluorescence spectra of the groups, enabling the fluorescence resonance energy transfer effect (FRET), the coating with different group ratios exhibits tunable fluorescence under the same excitation light, providing diverse patterns. Moreover, due to the reversible photo-crosslinking and thermal de-dimerization properties of anthracene, the recording, erasure, and rewriting of the surface pattern can be realized, and the fluorescent anti-counterfeit coatings exhibit excellent self-healing properties after cross-linking due to the FRET effect, which solves the problem of poor healing and ensures the stability and integrity. The fluorescent coating with cross-linked structure and self-healing behavior based on the FRET effect greatly expands the functional applications of traditional polyurethane materials.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Meng Wu,Yiping Wu,Hao Song,Yanjie Zhang
Traditional anti-counterfeiting technology based on fluorescent materials is usually single-color emission and far from enough to meet the growing demand for anti-counterfeiting with high-level security. Here, dual luminescent centers with blue emission at 470 nm and green-yellow emission at 546 nm have been successfully achieved by controlling the Eu 2+ sites in the Sr x Ba 1-x Si 2 O 2 N 2 (x = 0.25–0.50) host lattices via fine-tuning of Sr contents (x). Notably, Sr 0.50 Ba 0.50 Si 2 O 2 N 2 : 0.02Eu 2+ exhibits particular optical information storage properties with intense yellow emission and can repeat the corresponding image patterns under the thermal stimulus, which can be regarded as an essential candidate in multicolor anti-counterfeiting technology. Further, the different luminescent center-trap center pairings have been found in Sr 0.33 Ba 0.67 Si 2 O 2 N 2 : 0.02Eu 2+ due to the substitution of Ba 2+ and Sr 2+ by Eu 2+ to generate blue and yellow luminescent centers and the substitution of N 3− for O 2− in the Sr and Ba lattices resulting in oxygen vacancies. Typically, Sr 0.33 Ba 0.67 Si 2 O 2 N 2 : 0.02Eu 2+ exhibits a cool white emission in photoluminescence (PL) mode and changes to yellow emission in persistent luminescence (PersL) mode. Moreover, Sr 0.33 Ba 0.67 Si 2 O 2 N 2 : 0.02Eu 2+ displays a thermochromic phenomenon (from cool white emission to blue emission) in thermally stimulated luminescence (TSL) mode, attributed to the different trap depths in Sr and Ba lattice. Hence, flexible film for optical information storage and patterns for multimodal dynamic anti-counterfeiting are fabricated using Sr 0.33 Ba 0.67 Si 2 O 2 N 2 : 0.02Eu 2+ . Finally, a dynamic optical information encryption and decryption strategy for Morse code is developed based on the different properties of Sr x Ba 1-x Si 2 O 2 N 2 : 0.02Eu 2+ (x = 0.25, 0.30, 0.33, and 0.50). The results demonstrate that Sr x Ba 1-x Si 2 O 2 N 2 : 0.02Eu 2+ (x = 0.25–0.50) phosphors can be potential candidates in optical information storage and optical anti-counterfeiting applications.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
SEED SCIENCE AND TECHNOLOGY
·
2012
·Vol. 40
·期 3
·396-403
·
IF 0.62
Tian Y.X.,Guan Y.J.,Hu J.,Wang Q.T.,Hu Q.J.,Zhu S.J.
Five fluorescent dyes – rhodamine B (RB), rhodamine 6G (R6G), lissamine rhodamine B (LRB), 3, 6-diamincacridine hulmisulfate (DH) and safranine T (ST) – were used to label seeds as an anti-counterfeiting technology. The effects of the d yes on physiological parameters of
rape and the patterns of fluorescence of rape seedlings were investigated. The results showed that s oaking seeds for 24 hours in 0.1 mg RB ml−1, 0.1 mg LRB ml−1 or 0.1 mg ST ml−1 had no significant effects on seed germination, seedling growth,
seedling protective enzyme activities or chlorophyll content. RB and LRB emitted bright red and bright orange fluorescence under a fluorescence microscope, when excited by green light (546 nm) and blue light (495 nm), respectively, whereas ST showed little difference compared with the control.
Moreover, the vascular bundles of stem, seedling roots and aerial parts of seedlings treated with RB all emitted brilliant fluorescence for a long time, which could be used as a marker in seedlings. Our results suggest that labelling rape seeds with RB dye at a suitable concentration can be
used as an anti-counterfeiting technique.
研究领域:
植物学
·
农业科学
✓ 已验证
DOI
高影响因子
Small
·
2025
·
IF 12.1
Qikuan Cheng,Haotian Sun,Zhaohan Yu,Pengyu Gu,Yi Yuan,Jiawei Du,Beibei Huang,Dong Wang,Lu Zhang,Yunming Wang,Huamin Zhou
Responsive photonic crystals have garnered significant attention in recent years due to their remarkable capability of exhibiting dynamic color changes in response to external stimuli. Herein, a novel multistage anti-counterfeiting photonic crystal device that integrates chemical (luminescent material) and physical (photonic crystal structure) elements is reported. Based on photochromic materials and thermochromic capsules, a four-state thermochromic/photochromic photonic crystal (TPPC) composite film with dual responsiveness is developed through in situ emulsion polymerization and a straightforward roll shear technology. This innovative approach successfully resolved the issue of short-range order and long-range disorder in conventional photonic crystal films. Through the integration of a multilayer structure and a mask plate process, the dual effects of photochromic and thermochromic are seamlessly combined, enabling the film to exhibit four different optical states under the combined stimuli of temperature and UV light. Unlike tristate systems, the film integrates dual stimuli (UV + heat) for enhanced complexity. Notably, the film demonstrates multilevel responsiveness and dynamic decorative capabilities, allowing flexible switching between four optical states. Furthermore, the TPPC film boasts excellent mechanical properties (with a tensile strength exceeding 2 MPa), emphasizing its strong potential for applications in anti-counterfeiting, information encryption, and dynamic display technologies.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Haitang Hu,Miaomiao Wang,Shoujun Ding,Chuancheng Zhang,Hao Ren,Yong Zou,Wenpeng Liu
Rare earth ion-doped luminescent materials exhibit significant potential for application in visible solid-state laser and anticounterfeiting applications. The Czochralski method was employed to successfully synthesize high-quality Dy3+, Eu3+ codoped Gd3Sc2Al3O12 (GSAG), and Gd2.79Y0.21Sc2Al3O12 (GYSAG) single crystals. Comprehensive studies were conducted on their structural and physicochemical properties, luminescence properties, and fluorescence lifetime. The Dy,Eu:GSAG and Dy,Eu:GYSAG crystals both display favorable thermal conductivity values of 5.56 and 5.43 W m–1 K–1, respectively, along with commendable hardness properties of 7.241 and 7.247 kg/mm2. The emission color of the Dy,Eu:G(Y)SAG crystals can be adjusted from white light under a 355 nm excitation to orange-red light under a 405 nm excitation and bright yellow light under a 450 nm excitation. Additionally, the maximum stimulated emission cross-section for both crystals was calculated under various wavelength laser excitations. The fluorescence lifetime of the crystals at the 4F9/2 level (Dy3+) and the 5D0 level (Eu3+) was also examined. Notably, the fluorescence quantum efficiencies at the 4F9/2 level in Dy,Eu:GSAG and Dy,Eu:GYSAG were measured to be impressive at 91.3 and 92.7%, respectively. The mechanism of resonance energy transfer between Dy3+ and Eu3+ was analyzed, indicating promising applications of Dy,Eu:G(Y)SAG in visible solid-state lasers and multimode anticounterfeiting.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）