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
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光学工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-10
·
IF 5.3
Li Zhonghao,Wan Zherui,Cui Xiaoxu,Chen Qi,Hua Yue,Yang Guang
Polymer dots (PT-PDs) were obtained through a “synthesis-modification integration” method by using polyethyleneimine (PEI) and tartaric acid (TA) as raw materials. The designed PT-PDs displayed a nanoscale structure with an average size of 1.6 nm, and bright blue fluorescence (FL) emission with a fluorescence quantum yield (QY) of 14.3%. Moreover, the PT-PDs were used as a sensing platform for the sensitive and quantitative detection of tetracyclines (TCs) and Al 3+ via fluorescence quenching and recovery. The LODs for tetracycline hydrochloride (TCH), doxycycline (DOX), and Al 3+ were 94.8 nM, 76.7 nM, and 177.8 nM, respectively. In addition, PT-PDs incorporated with polyacrylamide were used for the recognition of TCs and Al 3+ in a portable manner on the basis of the fluorescence “ON–OFF-ON” strategy, which revealed great application in the field of anti-counterfeiting and encryption. Graphical
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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DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
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IF 8
Yixuan Xu,Zihan Cheng,Henggang Wang,Jun Jiang,Zuxu Zhou,Linger Feng,Xiaomeng Wang,Hengwei Lin,Kai Jiang
Luminescent materials with time-resolved dynamic discoloring afterglow (TDDA) hold significant potential for applications in anti-counterfeiting and data encryption. However, the afterglows coming from organic systems are usually unidentifiable due to their shorter durations (less than 10 s). Achievement of long-lasting and visually discernible TDDA remains highly desirable but challenging. In this work, the TDDA duration is successfully extended from less than 10 s to minutes by engineering the luminescent centers of carbon dots (CDs) and introducing deep trap-states in a composite of CDs and carbon nitrides (CNs) (named Y-CDs@CN). It is confirmed that the regulation of luminescent centers in CDs containing both C═N and C═O bonds is responsible for the color changes during TDDA from yellow to green. Moreover, the generation of deep trap states is found to be significant for prolonging the afterglow duration to minutes level through converting room temperature phosphorescence into long persistent luminescence, thus making the entire dynamic discoloring process being easily recognized to naked eyes. Furthermore, the afterglow of Y-CDs@CN can also be excited by blue light and even using white light of a cell phone. To harness these characteristics, potential applications of Y-CDs@CN for portable anti-counterfeiting and multidimensional information encryption are primarily investigated.
研究领域:
材料科学
·
光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongfa Li,Wenjun Zhang,Chengyue Xin,Zihan Chen,Jian Sheng
Mn ions in different valence states can emit light of different colors in an octahedral coordination environment, which is conducive to the development of a single matrix with multi-color luminescence and applications in the field of anti-counterfeiting. The dual mode multi-color luminescent material CaSb 2 O 6 : Mn has been successfully synthesized using a single Mn source in the atmosphere. The CaSb 2 O 6 matrix itself can also absorb 285 nm UV light, emit blue light, and show a long afterglow phenomenon. Both Mn 4+ and Mn 2+ ions will appear in the [SbO 6 ] octahedra, whether the Mn source adopts MnCO 3 or MnO 2 . The Mn 4+ ion exhibits red emission upon UV excitation at 347 nm. The Mn 2+ ion can emit a bright green light at 285 nm excitation while exhibiting a long afterglow phenomenon. In this study, the Mn 2+ doped octahedron showed unique green emission and broadens the range of its photoluminescence (PL) wavelength. The performance of the material's long afterglow properties on the digital codes demonstrates its potential for dynamic anti-counterfeiting.
研究领域:
材料科学
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光学
·
无机化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiantao Lü,Ting Fan,Jie Liang,Yayun Zhou,Tingting Deng,Ruming Jiang
With the combination of carbon quantum dots (CDs) and rare earth-doped fluorescent materials, multi-mode luminescence can be achieved in fluorescent ink, thereby enhancing its anti-counterfeiting security coefficient. However, the self-quenching process in CDs currently hinders their application in the field of anti-counterfeiting. In this study, we employed simple chemical method to prepare the SiO 2 -encapsulated YVO 4 :Eu 3+ /CDs nanocomposites, which greatly improved the stability of the composite and achieved dual-mode solid-state luminescence. Quick response code anti-counterfeiting patterns were fabricated using screen printing technology, and dual-mode luminescence performance with red and blue emission was achieved under excitation at 254 nm and 365 nm respectively. The YVO 4 :Eu 3+ @SiO 2 @CDs nanocomposites showed stable dual-mode luminescent performance in both solid-state and solvent environment, demonstrating great potential in anticounterfeiting and information protection application.
研究领域:
材料科学
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光学
·
防伪技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Channa Wang,Fuzhu Liu,Mingjin Du,Mi Zhang,Xiangdong Ding,Changsheng Xiang
Identical fluorescent emission in carbon dots (CDs) is crucial for applications such as anti-counterfeiting which requires precise spectrum control. However, the optical properties of CDs are highly sensitive to reaction conditions, which complicate their consistency. In this study, nitrogen-doped CDs (N-CDs) were synthesized using a single precursor (2,4-dihydroxypyridine) under different conditions, all exhibiting identical blue fluorescence, regardless of size and reaction parameters. X-ray photoelectron spectroscopy (XPS) and elemental analysis confirmed a high concentration of graphitic and pyridinic nitrogen in the N-CDs. Density functional theory (DFT) calculations were employed to explore the influence of these nitrogen species on the optical properties of the N-CDs. The results demonstrated that graphitic nitrogen plays a pivotal role in size-independent emission by disrupting the conjugated sp2-carbon domains, effectively eliminating the quantum confinement effect. This study offers new insights into the role of graphitic nitrogen in band gap engineering and the fluorescence mechanism of CDs, revealing a path to achieve CDs with identical fluorescent emission. The stable and reproducible emission under various reaction conditions positions these N-CDs as ideal candidates for large-scale production of blue CDs, minimizing the need for complex purification processes. Furthermore, N-CDs were modified with urea to enhance hydrophilicity, making them suitable for use as markers in aqueous products. The resulting hydrogen-bond-enhanced reticulated structure also endowed the material with room-temperature phosphorescence (RTP) properties. This innovation grants N-CDs substantial potential for anti-counterfeiting applications across various media.
研究领域:
材料科学
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光学
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化学工程
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DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Hanyu Xu,Yanling Wei,Rong Wang,Guiying Liang,Tianqi Sheng,Zuoling Fu
The cesium-based fluoride Cs 3 YF 6 has increasingly attracted curiosity due to its potential in up-conversion luminescence applications, signifying a possible revolutionary change in the next generation of lanthanide-doped luminescent functional materials. However, the nature of the photoluminescence process involving Cs 3 YF 6 has still not been studied in detail. Developing Cs 3 YF 6 luminescence applications is an intricate endeavor. Herein, we present the optimal doping concentration required for Eu 3+ and Tb 3+ doping in Cs 3 YF 6 . Meanwhile, by spectra analyses and theoretical model simulations, we have been able to decipher the intricacies of the energy transfer interaction that transpires between Tb 3+ and Eu 3+ ions. Furthermore, a water-sensitive fluorescence response system tailored for anti-counterfeiting applications was designed, which relied on the superior luminescence characteristics of Cs 3 YF 6 doped with Tb 3+ /Eu 3+ under excitation at 254 nm, whilst simultaneously exploiting the easily deliquescent nature of Cs 3 YF 6 . This work not only enhances the understanding of Cs 3 YF 6 materials in the field of rare-earth luminescence but also introduces a novel anti-counterfeiting strategy, that propels the development of applications for rare-earth-doped fluoride materials.
研究领域:
材料科学
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光学
·
稀土发光材料
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Liao Shihua,Xiang Jiamei,Wu Shaogui
This study presents a facile one-pot solvothermal synthesis of high-performance green fluorescent carbon dots (G-CDs) using o-phenylenediamine and ethylenediamine as precursors. The G-CDs show excellent optical, temporal, and chemical stability. Notably, they exhibit the highest quantum yield of 24.2% in ethanol and a strong green emission peaking at 546 nm under 440–490 nm excitation. In addition, G-CDs have outstanding salt resistance and multi-solvent compatibility. Due to its bright photoluminescence, G-CDs can be used as a secure ink for anti-counterfeiting. More remarkably, Cd 2+ ions can efficiently quench the fluorescence of G-CDs with a detection limit of 0.152 µmol/L, enabling accurate quantification of Cd 2+ in water systems. The simple synthesis of high-performance G-CDs expands their applicability in sensing and bioimaging.
研究领域:
材料科学
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分析化学
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环境科学
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DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 7
·3651-3659
·
IF 4.21
Wang Jian,Liu Zetan,Shao Xinyi,Hu Na,Liu Min,Xu Yaowei
In order to prevent the spread of counterfeit and shoddy products, fluorescent fibers from inorganic fluorescent substance and organic materials are continuously being developed. In this paper, a novel method, which was different from spinning method, was presented for preparing fluorescent cellulose fiber (FCF). This method involved modification of cellulose fiber by sodium chloroacetate and self-assembly of cellulose and Eu 3+ by coordination interaction. The fluorescence properties, crystallinity, element compositions and microscopic morphology of the fluorescent cellulose fiber were characterized. The preparation mechanism of fluorescent cellulose fiber was explained. The red was presented by the FCF when it was exposed under the ultraviolet at wavelength of 397 nm, which showed its potential application in the field of security. The self-assembled preparation method was expected to be a novel candidate for the preparation of cellulose-based fluorescent fibers.
研究领域:
材料科学
·
化学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 12
·8207-8215
·
IF 1.354
Gong Guo,Xie Shaowen,Song Ya,Tan Haihu,Xu Jianxiong,Zhang Changfan,Xu Lijian
Well-defined and mono-dispersed lanthanide-ion-doped NaYF4 up-conversion nanoparticles (UCNPs) were synthesized via thermal decomposition using lanthanide oleate as the precursor. By rational selecting the dopant pairs of the doped lanthanide ions (Y3+, Yb3+,
Er3+ and Tm3+) with accurate molar ratios, three-primary-color (RGB) UCNPs which exhibited green (UCNPs-G), blue (UCNPs-B) and red (UCNPs-R) fluorescence, respectively, were prepared. The X-ray diffraction (XRD) patterns showed that the three UCNPs were purely hexagonal-phase
NaYF4 crystals. Transmission electron microscopy (TEM) images revealed that the synthesized UCNPs exhibited well-defined nanosphere morphology with uniform size distribution. The average diameters were 23.95±3.35 nm for UCNPs-G, 20.63±2.59 nm for UCNPs-B, and 19.24±2.37
nm for UCNPs-R, respectively. After surface modification employing polyacrylic acid (PAA) as modifier, the obtained UCNPs were converted to be hydrophilic, which can be used as fillers to construct luminescent polymer films and luminescent ink in anti-counterfeiting application.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 11
·4414-4422
·
IF 4.569
Zhi Wang,Xu Li,Mingyang Li,Jinxing Zhao,Zhenyang Liu,Dawei Wang,Li Guan,Fenghe Wang
With the increasing demand for new inorganic functional materials, more and more attention is paid to rare earth ion doped luminescent materials. In this work, an Eu2+ doped Ba4La6O(SiO4)6 phosphor was synthesized by the high temperature solid-phase method. In the phosphor, two Ba2+ sites could be occupied by Eu2+ cations to provide two different kinds of coordination environments, resulting in broad emitting bands in the range of 450–630 nm and ultra-wide excitation bands in the range of 250–500 nm. The presence of two different Eu2+ emitting centers is verified by measuring the photoluminescence spectra and decay curves in Ba4La6O(SiO4)6 phosphors. The temperature dependence of emission intensity and full width at half maximum of Eu2+ in the range of 293–453 K were investigated systematically. The substitution of Ba2+ by Sr2+ can adjust the crystal field; thus, the luminous intensity was improved by 2.07 times and T50 was increased from 380 K to 453 K. Due to the Sr2+ ion doping, some of the Eu3+ ions cannot be reduced and remain in the trivalent state. In addition, by integrating the as-prepared Ba1.42Sr2.5La6O(SiO4)6:Eu phosphor, commercial blue and red phosphors, and a 385 nm LED chip, a white-LED lamp was made, which realized an applicable color rendering index (Ra = 94.6). For the Ba0.42Sr3.5La6O(SiO4)6 phosphor, the emission can be shifted from yellow to green and to yellow by excitation wavelength variation from 250 to 360 and 480 nm, which proves that the phosphor is a promising candidate for anti-counterfeiting applications.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhan Shu,MengQi Li,Lu Gan,Lijia Wan,Xiaoling Chen,Xiaohang Zhang,Weijun Gui
Highly luminescent GdVO 4 :Eu 3+ /carbon dots (CDs) nanocomposite was synthesized by hydrothermal deposition method for the first time. With the use of dialyzed CDs solution as precursor, the synthetized composite shows negligible emission intensity of CDs. On replacing the dialyzed CDs solution with the crude one, highly luminescent composite can be obtained successfully. Based on the analysis of XPS and FT-IR spectra, one can deduce that the existence of a large amount of citrate anions, ethylenediamine cations and polymer-like CDs in the crude CDs solution make it as nutrient solution of CDs, which can not only facilitate growth of CDs on the surface of GVE, but also greatly prevent nitrogen atoms from falling off the particles during the hydrothermal deposition process. For the dialyzed CDs solution, due to the ions and polymer-like CDs being thoroughly dialyzed, the coated CDs are fragile during hydrothermal deposition process. Besides, the effects of different dosages of ammonia on emission intensities of the two composites are studied. Based on the designable patterns for security application, one can think that the highly luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
研究领域:
材料科学
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光学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）