JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·2235-2243
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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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenglin Gong,Lin Lin,Yingzhen Wu,Yanan Zhang,Zhuohong Feng,Zhezhe Wang,Yantang Huang,Zhiqiang Zheng
In this paper, Cs 2 NaErCl 6 double perovskites microcrystals (MCs) co-doped with Yb 3+ and Bi 3+ are successfully synthesized by a simple “dissolving-drying” method. When excited at 379 nm, 808 nm and 980 nm, the MCs show strong red, green and yellow light, respectively, which can be well distinguished by the naked eyes. On this basis, two kinds of systems are designed with doped/undoped MCs for triple-mode fluorescent anti-counterfeiting and information encryption of numbers and characters. The results indicate that our MCs are not only beneficial to the application of fluorescent anti-counterfeiting, but also greatly improve the security of anti-counterfeiting. In addition, we evaluate the temperature sensing performance of these MCs by fluorescence intensity ratio technique. The samples show a high relative sensitivity as 3.8 %/K at 243 K. The results show that the samples have multi-functional applications in the fields of fluorescent anti-counterfeiting and temperature sensing, and this work will broaden the application fields of lead-free double perovskites in fluorescent anti-counterfeiting and temperature sensing.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 2
·1115-1127
·
IF 6.123
Wang Haiping,Qian Xueren,An Xianhui
The research of anti-counterfeiting and encryption has always been a subject of universal concern all over the world. Herein, lanthanide metal–organic framework (Eu-MOF) and CH 3 NH 3 PbBr 3 (MAPbBr 3 ) perovskite were introduced onto pulp fibers (PFs) to prepare fluorescent anti-counterfeiting and encryption papers. Eu-MOF@PFs paper emitted red fluorescence at 254 nm UV excitation. The optimum preparation conditions of Eu-MOF@PFs were 2.5 mmol of Eu(NO 3 ) 3 , 4 h of reaction time and room temperature. When MABr ink was written on Pb/Eu-MOF@PFs paper, the green fluorescent handwriting and red fluorescent paper were observed under 365 nm and 254 nm UV excitation, respectively. The appropriate addition amount of lead nitrate was 0.6 mmol. Pb/Eu-MOF@PFs paper was immersed in MABr solution to prepare MAPbBr 3 @Pb/Eu-MOF@PFs paper. Under 254 nm and 365 nm UV irradiations, MAPbBr 3 @Pb/Eu-MOF@PFs paper emitted red-green double fluorescence and the quantum yields of which were 3.11% and 2.48%, respectively. The crystal structure of MAPbBr 3 was easily destroyed by polar solution, which realized on/off switching of the luminescence signal for multistage information encryption. The above paper-based fluorescence materials were potential for advanced anti-counterfeiting and encryption applications.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 8
·3880-3889
·
IF 3.9
Wang Haiping,An Xianhui,Qian Xueren
Fluorescent anti-counterfeiting paper was a very important kind of special paper, which played an important role in people’s life, such as paper money. In this work, fluorescent anti-counterfeiting paper was prepared by using lead-metal–organic framework (Pb-BTC) that was in situ formed on the surface of pulp fibers (PFs) with lead ions and pyromellitic acid (H 4 BTC), which served as template to in situ anchoring of CH 3 NH 3 PbBr 3 (MAPbBr 3 ) to achieve the controllable synthesis of MAPbBr 3 and reduce aggregate fluorescence quenching. The CH 3 NH 3 Br (MABr) as the anti-counterfeiting ink was applied on Pb-BTC@PFs to achieve security writing. MAPbBr 3 forming writing was invisible under sunlight but displayed green fluorescence under 365 nm ultraviolet lamp excitation. The writing with green fluorescence could be extinguished by water and reconstructed by forming new MAPbBr 3 . The Pb-BTC@PFs was as the precursor to product fluorescent anti-counterfeiting paper (MAPbBr 3 @Pb-BTC@PFs) reacted with MABr in ethanol solution, so that the green fluorescence of it was opened under 365 nm ultraviolet lamp. When it was exposed to polar solution, MAPbBr 3 structure collapsed. Since Pb-BTC was stably in paper and was not easy to lose in polar solution, it could be reused several times on the premise that the paper structure was not damaged, which demonstrated an advantage over using perovskite alone in paper. Consequently, the current study not only provided a new idea for controllable anchoring perovskite on support materials, but also offered a new method for producing fluorescent anti-counterfeiting paper.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Materials Horizons
·
2024
·
IF 12.2
Jinfeng Zhang,Yuanfen Huang,Xiaoyuan Zhang,Xin Guo,Kailong Chen,Xiang Feng,Jiajia Kong,Yanqing Liu,Bin Shang,Weilin Xu,Dongzhi Chen
Silicon nanocrystals (SiNCs) have attracted considerable attention in many advanced applications due to silicon's high natural abundance, low toxicity, and impressive optical properties. However, little attention has been paid to fluorescence anti-counterfeiting applications based on lipophilic silicon nanocrystals. Moreover, it is also a challenge to fabricate aging-resistant anti-counterfeiting coatings based on silicon nanocrystals. Herein, this paper presents a demonstration of aging-resistant fluorescent anti-counterfeiting coatings based on red fluorescent silicon nanocrystals. In this work, lipophilic silicon nanocrystals (De-SiNCs) with red fluorescence were prepared first by thermal hydrosilylation between hydrogen-terminated silicon nanocrystals (H-SiNCs) and 1-decene. Subsequently, a new SiNCs/PDMS coating (De-SiNCs/DV) was fabricated by dispersing De-SiNCs into reinforcing PDMS composites with vinyl-capped silicone resin. Interestingly, the De-SiNCs/DV composites exhibit superior transparency (up to 85%) in the visible light range, outstanding fluorescence stabilities with an average lifetime of 20.59 μs under various conditions including acidic/alkaline environments, different organic solvents, high-humidity environments and UV irradiation. Meanwhile, the encapsulation of De-SiNCs is beneficial to enhancing the mechanical properties and thermal stability of De-SiNCs/DV composites. Additionally, the De-SiNCs/DV coating exhibits an excellent anti-counterfeiting effect on cotton fabrics when used as an ink in screen-printing. These findings pave the way for developing innovative flexible multifunctional anti-counterfeiting coatings in the future.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Maoxia Ran,Haiyan Qi,Tao Jing,Jun Li,Wenbo Li,Jiayu Zhang,Chao Luo,Xiaochen Zhu,Yang Gao
Herein, high-efficiency green fluorescence nitrogen doped CDs (G-CDs) were prepared using acetaminophen and ethylenediamine as precursors. The G-CDs exhibited good anti-photobleaching, salt tolerance and low cytotoxicity. Interestingly, the G-CDs revealed excellent fluorescence stability in the pH range of 6–12, however, the intensity of the G-CDs was almost completely quenched in other pH values. The MnO 4 − demonstrated strong fluorescence quenching capability on our G-CDs with the mechanism involving dynamic quenching caused by energy transfer. G-CDs exhibited a strong linear relationship with MnO 4 − concentration in the range of 0–75 μmol/L, with a low limit detection of 7.6 nmol/L. What was even more interesting was that the G-CDs displayed bright green solid-state fluorescence, and exhibited potential application in anti-counterfeiting.
研究领域:
分析化学
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材料科学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 19
·7552-7557
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IF 8.067
Haiyan Zhao,Tianyu Lin,Shuchen Shi,Wenhao Bai,Tongtong Xuan,Tianliang Zhou,Rong-Jun Xie
Luminescent materials have been widely used in the field of information security. However, single-mode anticounterfeiting technology with the aid of UV light excitation to generate visible-light emission is rough and easily decrypted. Herein, we build a novel information encryption and decryption technology based on the reversible ON/OFF luminescence of perovskite nanocrystals (NCs) caused by the phase transformation from luminescence-free Cs4PbX6 (X = Cl, Br, I) to visible-light-emitting CsPbX3 NCs. This phase transformation is easily realized by just controlling the water content, where the Cs4PbBr6 NCs can be converted to green-emitting CsPbBr3 NCs under water vapor treatments, and the latter is quickly changed back to Cs4PbBr6 NCs by vacuum drying. The water-induced photoluminescence switch is reproducible, stable, and reliable for information encryption and decryption, as demonstrated by inkjet printing patterned films on a glass substrate using the security ink of Cs4PbBr6 NCs in cyclohexane solution. Furthermore, each pixel in the patterned film containing confidential information is quite unique in microscopic morphology, enabling multimode anti-counterfeiting if combined with artificial intelligence.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
APPLIED OPTICS
·
2021
·Vol. 60
·期 8
·2304-2313
·
IF 1.98
Xiaoju Wang,Xi Chen,Guobin Xu,Jie Li,Jiaqi Guo,Qi Wang
Fluorescent anti-counterfeiting is one of the most widely used anti-counterfeiting technologies at present. The demand to develop new anti-counterfeiting materials and technology is more and more urgent. Zinc oxide quantum dots (ZnO QDs) have superior fluorescent properties under ultraviolet light, making them a suitable replacement for traditional phosphors for anti-counterfeiting printing, which is environmentally friendly and meets the needs of sustainable development. In this paper, water-soluble ZnO QDs with an average particle size of 5.64 nm were prepared. Paper coated by ZnO QDs was obtained after ultrasonic treatment, which could emit bright yellow fluorescence when excited by ultraviolet light. As the concentration of ultrasonic solution is increased, the loading amount of ZnO QDs on the coated paper increased gradually, reaching the maximum when the concentration is increased to ${1}\;{\rm mol}\;{{\rm L}^{- 1}}$, which then does not change with an increase in concentration. The fluorescent intensity of the coated paper was consistent with the changing trend of the loading amount. The coated paper has excellent optical stability, is easy to recycle, and provides simple identification of authenticity by ultraviolet light and anti-copy functionality. Their application in packaging and printing is of great significance to the development of complex, concealed and non-repeatable anti-counterfeiting technology.
研究领域:
材料科学
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印刷技术
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环境保护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Jianxi Xie,Lianghua Zhou,Weihao Ye,Yan Zhang,Guangqi Hu,Xiaotang Liu
Carbon dots (CDs) with aggregation-induced emission (AIE) effect can effectively solve the problem of weak fluorescence of solid CDs due to aggregation-caused quenching (ACQ) effect. A kind of carbon dots@cyanuric acid composites (CDs@CYA) with AIE effect was reported in this paper, which is prepared by one-step microwave-assisted method using low-toxicity and low-cost imidazole, urea and tartaric acid as precursors. The AIE effect of CDs@CYA is derived from the restriction of intramolecular motion of the imidazole and cyanuric acid (CYA) groups on the surface of CDs in the aggregation state and convert non-radiative energy into radiative energy, as is verified by control variable experiments. CDs@CYA aqueous solution was used in fluorescent anti-counterfeiting ink, light conversion film (LCF), fluorescent probe and biological imaging. CDs@CYA powder was encapsulated on the blue chip with red phosphor by epoxy resin to obtain a white light-emitting diode (LED) device with a color coordinate of (0.33, 0.28), a color temperature of 5558 K and a color rendering index of 76.4.
研究领域:
材料科学
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光学
·
生物成像
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 30
·18381-18386
·
IF 3.361
Hongrui Cheng,Xiaofeng Wei,Haijiang Qiu,Wensong Wang,Wenyue Su,Yuanhui Zheng
Carbon-based fluorescent security labels are effective methods to prevent counterfeiting. However, the properties of poor optical stability, complex and energy-consuming synthesis processes and weak bonding with substrates of carbon-based fluorescent materials limit their application prospects. Here, a novel in situ fluorescent patterning strategy is developed to achieve covert, chemically stable and solvent-tolerant cellulose-based security labels by UV exposure. The unsaturated double bonds as the origin of the fluorescence were generated during the photodegradation process under UV exposure. The fluorescent emission of cellulose-based materials reveals excellent stability under acidic, alkaline, reducing, oxidizing and non-polar solvent environments. These advantages give the cellulose nanofiber based security label fantastic potential applications.
研究领域:
材料科学
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光学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Yin CHEN,Shao-wen XIE,Chao TONG,Hai-hu TAN,Li-jian XU,Na LI,Jian-xiong XU
Novel hydrophilic NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 :Ce 3+ ,Eu 3+ double-jacket microtubes (DJMTs) with upconversion/ downconversion dual-mode luminescence were designed and prepared through epitaxial growth of NaGdF 4 :Ce 3+ , Eu 3+ shell onto the NaYF 4 :Yb 3+ ,Tm 3+ microtube via poly(acrylic acid) (PAA) mediated hydrothermal method. It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell onto the surface of NaYF 4 :Yb 3+ ,Tm 3+ parent microtubes. The growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell experienced a crystal phase transition from β -NaGdF 4 and β -NaYF 4 mixture to β -NaYF 4 @NaGdF 4 composite crystal, and morphology evolution from mixture of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and β -NaYF 4 :Yb 3+ ,Tm 3+ microtubes to NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 : Ce 3+ ,Eu 3+ DJMTs. The formation mechanism of DJMTs was the dissolution−renucleation of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and the growth of β -NaGdF 4 :Ce 3+ ,Eu 3+ shell via the classical Ostwald ripening mechanism. The as-prepared DJMTs could exhibit blue upconversion and red downconversion luminescence, which was further made into environmentally benign luminescent inks for creating highly secured and fluorescent-based anti-counterfeiting patterns via inkjet printing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 22
·2300861
·
IF 9
Ping Qi,Shideng Yuan,Yihan Liu,Renhao Dong,Aixin Song,Jingcheng Hao
Here, a polymerizable type-IV deep eutectic solvent (DES) is synthesized via the coordination reaction between acrylamide and SbCl 3 , and for the first time it is demonstrated that the resultant type-IV DES-based polymers can exhibit luminescence after polymerization due to the efficient Sb-ligand and ligand–ligand charge transfer. Notably, the quantum yield of Sb-ligand charge transfer emission can be tuned with the controllable reversible addition-fragmentation chain transfer (raft) polymerization of acrylamide, reaching up to 15.32%. As a proof-of-concept application, the polymerizable DES is utilized as fluorescent anti-counterfeit ink, successfully realizing the fluorescence encryption.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）