JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·2235-2243
·
IF 3.094
Xiuxia Yang,Lei Zhao,Wei Zeng,Zhichao Liu,Xiaotong Fan,Shuyu Tian,Hao Zhang,Xuhui Xu,Jianbei Qiu,Xue Yu
Fluorescent anti-counterfeiting technologies have become indispensable by virtue of their high concealment properties. In this work, the observation of the characteristic emission originated from Eu 2+ and Eu 3+ ions in CaYAl 3 O 7 realizes a dual-mode anti-counterfeiting strategy. The host matrix provides an environment, where blue and red emission could be manipulated with the introduction of Nd 3+ ions for the reduced occupation of Eu 3+ in the sites of Y 3+ ions. Moreover, the photoluminescence spectra of these samples exhibit time and temperature-dependent dynamic changes thanks to the capture and release of carriers in the reconstructed traps induced by Nd 3+ ions. Herein, a multi-stimuli responsive dynamic and static anti-counterfeiting could be achieved in this work.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiang Mao,Xia Zhao,Hao Hu,Zequan Li,Jieqing Luo,Wei Gao
Anticounterfeiting work has always been a key work related to people’s interests, and fluorescent anticounterfeiting labels are more common. However, the current anticounterfeiting model of fluorescent anticounterfeiting markers is relatively simple and easy to copy. It is urgent to develop anticounterfeiting markers with better anticounterfeiting ability. To this end, we prepared fluorescent carbon dots (CDs) with an aggregation-induced emission (AIE) effect in one step using 2,2-dithiodibenzoic acid (DTSA) and a urea hot solvent. Blue fluorescence at 475 nm is emitted under ultraviolet excitation in the dispersed state, while orange-red fluorescence at 618 nm is emitted in the aggregated state. The two states’ fluorescence quantum yields and fluorescence lifetimes are 7.4%, 1.94 ns and 19.6%, 1.61 ns, respectively, with good crystallization properties. At the same time, due to the dehydration reaction of its carboxyl group and amino group, the consumption of a large number of carboxyl and amino groups makes it aggregate in aqueous solution, while it is dispersed in lower-polarity solvents, such as acetic acid and ethanol. The conversion of the two states can make its fluorescence change, and so a solvent-dependent multilevel anticounterfeiting ink is designed, which can be used for multilevel anticounterfeiting and information encryption.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Haidong Huang,Xinyang Li,Hui Zhang,Xiaohui Wang,Yichen Li,Liqin Chai,Guojin Liu,Yi Huang,Lan Zhou,Jianzhong Shao
The preparation of anti-counterfeiting textiles is usually associated with laborious processes, high cost and environmental risks. In this work, the core–shell colloidal nanospheres composed of the polystyrene (PS) core with embedded aggregation-induced emission (AIE) molecules of tetraphenylethene (TPE) and the shell of densely crosslinked PS ((PS-TPE)@CPS) were designed and synthesized via emulsion polymerization. The patterned fluorescence-responsive photonic crystals (FRPCs) were then constructed using the (PS-TPE)@CPS nanospheres as building blocks on textile substrates via screen printing. Thanks to the compatibility and affinity of TPE with PS and its own AIE property, the TPE molecules enriched in the PS core and then aggregated and embedded within (PS-TPE)@CPS colloidal nanospheres. Confined by the polymer chains, the TPE molecules formed π-π stacking and exhibited AIE effect, while maintaining a stable conjugated structure. The FRPC anti-counterfeiting patterns constructed with the (PS-TPE)@CPS nanospheres exhibited angle-dependent structural colors under visible light and sensitive responsive fluorescence characteristic under ultraviolet light, realizing the double anti-counterfeiting effect. This approach to achieve anti-counterfeiting textile is simple, cost-effective, and environmentally friendly. The obtained FRPC patterns possess excellent optical properties and anti-counterfeiting functions, meeting the requirements for the sustainable structural coloration of textiles, and also promoting the practical application of responsive photonic crystal anti-counterfeiting textiles.
研究领域:
材料科学
·
光学
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jinlong Wang,Zihan Zhao,Yiping Wu,Chunwen Ye,Yanjie Zhang
Advanced fluorescent anticounterfeiting technology has received widespread attention due to the lack of sufficient security of traditional anti-counterfeiting. Hence, there is a great challenge to continuously develop multi-level anti-counterfeiting technology with higher security. Here, we develop a desired fluorescent anticounterfeiting technology based on CsPbBr3 perovskite quantum dots (PQDs) and CaAl2O4:Eu2+, Nd3+ composites with persistent luminescence properties. CsPbBr3 PQDs can be formed on the surface of the CaAl2O4 host and exhibit an average diameter of around 3.5 nm. The photoluminescence (PL) intensity of CsPbBr3 PQDs/CaAl2O4 composites is greatly enhanced to 125 times compared to that of pure CsPbBr3 PQDs, and the desired narrow FWHM of 19 nm is achieved under near-ultraviolet irradiation. Furthermore, highly stable CsPbBr3 PQDs/CaAl2O4:Eu2+, Nd3+ composites with triple-modal (UV, IR, and thermal) fluorescent anti-counterfeiting characteristics were developed and used in fabricating anti-counterfeiting labels through screen-printing technology. The results open up a pathway to enhance the photoluminescence properties and stability of perovskite quantum dots for the advanced fluorescent anticounterfeiting application.
研究领域:
材料科学
·
光电技术
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yanyang Li,Huimin Du,Yue Ma,Meifang Liu,Jian Zou,Shentang Wang,Jun Yang,Shanshan Hu,Jun Lin
The existence of energy transfer channels from the self-trapped exciton (STE) emission to lanthanide (Ln3+) ions in double perovskites (DPs) opens up new possibilities for high security anti-counterfeiting applications. In the present investigation, we synthesized Sb3+/Ho3+/Er3+ doped Cs2NaGdCl6 rare-earth-based DPs using a simple solvothermal method, whose luminescence could be quenched by water and restored after drying. The efficient down-shifting (DS) red emission from the 4f–4f transition of Ho3+ was enhanced 8-fold due to the energy transfer of STEs → Ho3+ ions via Sb3+ sensitization. The DS and up-conversion (UC) dual-mode multicolor emissions were obtained by further introducing Er3+. Specifically, the DS luminescence of the tri-doped sample under the UV region and that under 448 nm irradiation were white and red, respectively; and the UC luminescence under 980 nm irradiation was green. In view of their stimulus response to water and dual-mode multicolor luminescence properties, advanced anti-counterfeiting materials based on the obtained samples were designed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Liang He,Xueyan Nan,Peipei Wang,Zhizhou Liu,Tong Wang,Pengli Bai
The nonconventional polymer luminophores (NPLs) with white emission are scarce due to the challenges in regulating their clustering structures. In this work, polystyrene is employed to develop a new kind of broad-emitting clusteroluminescence (CL) through suitable cross-linking and sulfonation. The sulfonated porous poly(styrene-co-divinylbenzene) microspheres (SPDMs) exhibit broad emission spectra (400–700 nm) in the visible light region. Further characterization and theoretical calculations show that through-space conjugation (TSC) enhanced with high cross-linking and sulfonation degrees (SD) is the main factor affecting the luminescence of microspheres. Monodisperse SPDMs with a low fluorescence distribution (CV < 5%) across 13 flow channels. Additionally, SPDMs microspheres is employed to construct binary, Cu 2+ , and pH-responsive microarrays to encrypt and decode important information. Finally, SPDMs are developed for utilization as single-component white and warm white light-converting light emitting diodes (LEDs). These LEDs demonstrate Commission International de L’Eclairage (CIE) coordinates and correlate color temperatures (CCT) of (0.31, 0.321) and (0.383, 0.41), 6611 and 4100 K, respectively. Notably, the color rendering index (CRI) value for SPDMs-50-2 in white LED applications reaches an impressive 92. This study provides an economical, simple, and effective design strategy for developing NPLs with both monodispersity and broad emission.
研究领域:
材料科学
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光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hui Zhang,Yazhou Wang,Yan Jiao,Si Chen,Meisong Liao,Yongzheng Fang,Weiqing Gao,Lili Hu
Fluorescent powders exhibiting excitation dependence and luminescent discoloration are profoundly relevant for concealing information and enhancing optical antiforgery protection. In this study, Bi 3+ /Ln 3+ (Eu 3+ , Er 3+ )-doped phosphors exhibiting multicolor luminescence and excitation wavelength dependence were synthesized. The Bi 3+ /Eu 3+ -codoped phosphors emitted blue, pink, lavender, and red lights under excitation from conventional ultraviolet (UV) sources. In addition to emitting blue light, the Bi 3+ /Er 3+ -codoped phosphors also transmitted upconversion-emission light from green to yellow under 980-nm laser excitation. Additionally, the luminous color of the Ca 3 Y 2 Ge 3 O 12 :0.01Bi 3+ , 0.2Er 3+ phosphor changed from yellow to orange as the temperature increased. Combining the above luminous-color-change phenomena, the word-hiding experiment exhibited excellent realistic information hiding, with complex color transformation in the stamen and petal parts of the flower pattern. Furthermore, rapid multimodal and complex discoloration was achieved using easy-to-obtain light sources, confirming the potential of Bi 3+ /Ln 3+ phosphors for anticounterfeiting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 23
·1887
·
IF 4.4
Xiaolong Qiao,Shixing Wang,Qiulian Liu,Yuanming Zhang,Guangting Han,Haoxi Ben,Wei Jiang,Haiguang Zhao,Yan Song
China is the country with the most abundant bamboo resources in the world. Using bamboo as a raw material for pulping and papermaking can save a lot of wood and protect forests. Bamboo pulping enterprises mostly adopt sulfate processes to produce a large amount of black liquor (BL), which contains monosaccharides, polysaccharides, oligosaccharides, pectin, lignin, etc. The utilization of the high-value organic matter is of great economic and environmental significance. In this study, blue-green carbon dots (C-dots) were prepared from bamboo ( Lingnania chungii ) kraft pulp BL using a hydrothermal method. The changes in carbohydrate content in BL in relation to hydrothermal temperature and hydrothermal time were discussed in detail. Then, a series of characterizations of BL-C-dots, prepared under one of the hydrothermal conditions (180 °C, 6 h), were performed and the BL-C-dots showed an excitation-dependent photoluminescence (PL) spectrum and a quantum yield (QY) of 2.9% in an aqueous solution. Finally, the as-prepared BL-C-dots were successfully used as fluorescent materials to develop an anti-counterfeiting code. The fluorescent code exhibited a clear outline, an excitation-tunable color, good stability, and high security, showing great anti-counterfeiting potential and realizing the high-value utilization of BL.
研究领域:
林业
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Sai Lin,Yinzi Cheng,Chun Lin,Jiali Fang,Weidong Xiang,Xiaojuan Liang
In this report, carbon nanodots (CDs) with tunable full-color emission were successfully synthesized by a solvothermal method. By changing the carbon source (p-phenylenediamine or o-phenylenediamine) and the concentration, green, yellow, orange and red CDs (GCDs, YCDs, OCDs and RCDs) were successfully fabricated. As the concentration of the starting materials was increased, the emission peak was red-shifted. The shifted peaks showed strong intensity and an obvious color change. This concentration-dependent effect was attributed to the reabsorption phenomenon. Carbon source was critical in determining the fluorescence properties and the quantum yield (QY) of full-color CDs was high. The CDs also presented a distinct pH sensitivity. The PL intensity of RCDs showed linear decreases over decreasing pH from 11 to 4 and from 4 to 2. Fluorescent oil carrying CDs was successfully applied for various purposes such as anti-counterfeiting, information encryption and storage purposes. An RCD film was successfully fabricated that could improve the correlated color temperature and color rendering index of white light-emitting diodes.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yusai Zhou,Gui Zhao,Jingming Bian,Xiaoli Tian,Xuejun Cheng,Hong Wang,Hongyu Chen
Forged signature threatens the authenticity of personal identity. Here, an effective SERS anti-counterfeiting system is designed for personal signatures. Mixed ligands improve the complexity of Raman spectra and expand the coding capacity. Fourteen distinct combinations are created from mere five ligands, and great expansion is possible with modest expansion of the ligand library. On the other hand, the (Au-aggregate)@Ag@PSPAA nanostructure significantly increases the surface-enhanced Raman scattering (SERS) intensity and stability so that excellent performance is achieved in SERS detection. By integrating these strategies, SERS inks are produced and applied in signature anti-counterfeiting. The resulting spectra are converted to barcodes that are readily detected through a smart phone APP. With these improvements, this work brings SERS one step closer toward practical applications in signature anti-counterfeiting.
研究领域:
材料科学
·
光谱学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 22
·2400648
·
IF 8
Shiwei Zhang,Jiurong Li,Xiao Gong
Carbon nanodots (CDs) possess exceptional fluorescence properties, which have been extensively studied in the fields of fluorescence detection and anti-counterfeiting information. However, the exploration of CDs with simple and fast synthesis paths, secure, and efficient encryption properties, remains a challenge. The rapid synthesis of orange CDs (O-CDs) is reported with a high photoluminescence quantum yield (PLQY) of 57.6% within 10 min at atmospheric pressure using a one-step pyrolysis method. The O-CDs exhibit a dual-emission property, with a blue emission peak at 425 nm and a strong orange emission peak at 590 nm. The dual-emission peaks of O-CDs can allow for fast orange/blue switching of fluorescence color with changes in the acid-base environment. O-CDs can serve as effective fluorescent probes for pH detection, depending on their fluorescence wavelength and intensity. Additionally, O-CDs have potential for fluorescence anti-counterfeiting. When exposed to NH 3 gas, O-CDs fluorescent ink rapidly (1 s) transitions from orange fluorescence to blue fluorescence, and then quickly (4 s) reverts back to orange fluorescence when the gas environment changes to HCl gas atmosphere. Thus, O-CDs fluorescent inks offer several advantages, including high fluorescence intensity, fast response, recyclability, and lossless encryption/decryption in “on-off-on” double encryption anti-counterfeiting.
研究领域:
材料科学
·
化学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 30
·7473-7483
·
IF 4.157
Zhao Huaqi,Jin Xilang,Zhou Hongwei,Yang Zheng,Bai Haiyan,Yang Jin,Li Yulong,Ma Yiting,She Mengyao
Glutathione and 2-aminopyridine are used as carbon sources to prepare carbon dots (CDs) by a one-step hydrothermal reaction. The results show that the average particle diameter of CDs is 8.64 nm with uniform size distribution and the fluorescence quantum yield is 13.62%. We further demonstrate that novel CDs possess highly selective sensing of Fe 3+ from 0.2 to 200 μM with a low detection limit (0.194 μM). Meanwhile, the fluorescence of CDs can be repeated many times by the addition of S 2− . Moreover, the CDs are used for biological imaging of living cells with well cell penetrability and low toxicity. Furthermore, it is successfully applied for anti-counterfeiting and information encryption. More interestingly, it can be doped with hydrogel and filter paper to prepare solid-phase sensors exhibiting high sensitivity and fast response, demonstrating their tremendous potential for the simple, rapid, and low-cost monitoring of Fe 3+ and S 2− . Graphical abstract
研究领域:
材料科学
·
生物医学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）