Nanomaterials
·
2022
·Vol. 12
·期 13
·2210
·
IF 5.719
Huiyong Wang,Hongmei Yu,Ayman AL-Zubi,Xiuhui Zhu,Guochao Nie,Shaoyan Wang,Wei Chen
The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications. In particular, RTP-CDs with dual modes of excitation are more interesting. Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation. Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs. Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure. Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure. The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds. These hydrogen bonds can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state. This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs. Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively. The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms. In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.Keywords:carbon dots;room temperature phosphorescence;visible/ultraviolet light excitation;anti-counterfeiting
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
K. Jin,X. Ji,J. Zhang,Q. Mi,J. Wu,J. Zhang
Multi-colour afterglow materials have attracted widespread attention recently, because they not only can eliminate the interference of scattered light and background fluorescence, but also store the richer information. In this work, the phosphorescence emission of cellulose-based nitrogen-doped carbon dots (CDs) was transferred to the rhodamine derivatives via an efficient radiative energy transfer process, because of the strong electrostatic attraction interactions between the positive charged CDs and the negative charged rhodamine derivatives. As a result, multi-color afterglow luminescence with tunable emission and wide color gamut was realized from blue-green to green, yellow, orange and red. With the contribution of the excellent processability of polymer materials, multi-color afterglow films, coatings, fibers and patterns were readily obtained, indicating a practical application in advanced anti-counterfeiting and multiple-mode information encryption. Such a facile, universal and efficient strategy to construct multi-colour afterglow materials inspires us to understand the luminescence process and design novel afterglow materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS LETTERS
·
2021
·Vol. 46
·期 16
·3829-3832
·
IF 3.776
Jinxing Zhao,Xu Li,Shengnan Li,Xinru Zhao,Fenghe Wang,Fenghe Wang,Dawei Wang,Guoyi Dong,Li Guan,Li Guan
Optical anti-counterfeiting has been developed as a promising optical-sensing technique. A self-activated ${{\rm KGaSiO}_4}$ phosphor was successfully prepared using the traditional solid-state method. The photoluminescence spectra of the as-synthesized phosphors indicate that the ultra-narrow band emission with green light peak at 503 nm is obtained when phosphors are excited by 254 nm UV light. Additionally, the measured afterglow curve shows that the emission of this phosphor can last more than 1200 s after UV excitation stops, which indicates that ${{\rm KGaSiO}_4}$ is a potential candidate for anti-counterfeiting materials. The luminescent and decay mechanism are discussed by theoretical calculation and thermo-luminescent spectra in detail. The theoretical model can provide support for explaining the mechanism of narrow band or persistent phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuanyuan Guo,Yixun Gao,Yao Wang,Yi-Kuen Lee,Patrick J. French,Ahmad M. Umar Siddiqui,Hao Li,Guofu Zhou
The significant in situ multicolored patterning without changing printing tools nor substrate media still remains challenging, especially toward practical applications for anti-counterfeiting. This research invented a unique universal approach for the laser-induced in situ synthesis of colorful fluorescent patterns (from blue: CIE 0.15, 0.18 to red orange: CIE 0.36, 0.39) through the controlled formation of N, S doped carbon dots (CDs) in solid composite polymer films or hydrogel with a hierarchical and physically unclonable microsurface architecture for anti-counterfeiting. The in situ patterning approach, coupled with multi-layer technique, yielding designable blue, yellow, orange, and red orange color under 365 nm in the same pattern. A 5 cm 2 colorful pattern can be efficiently finished within 5 min without changing the substrate and the line width accuracy can be up to 300 μm. The absolute quantum efficiency of the blue pattern reached as high as 23%. The fluorescent patterns can be survived at indoor for 24 months. The hydrogen bonding interactions between the CDs precursor and polymer facilitated the generation, uniform dispersion and stabilization of CDs during the laser irradiation. The hypothesis that laser irradiation induced photochemical reactions of CD precursors within a polymer matrix was supported by thermodynamic assessments. The universality of in situ fluorescent patterning strategy was demonstrated by developing fluorescent patterns on both solid polymer films, hydrogel, pharmaceutical packaging and textile.
研究领域:
材料科学
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光学工程
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化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 22
·2300911
·
IF 9
Binli Xiao,Puxian Xiong,Sheng Wu,Dongliang Jiang,Kang Chen,Yao Xiao,Peishan Shao,Yinzhen Wang
Mechanical luminescence (ML) is the conversion of mechanical energy into light energy when a material is subjected to a force. It is challenging to develop ML materials with tunable luminescent properties by single ion doping, which have broad application prospects in the fields of stress sensing and dynamic signature anticounterfeiting. In this study, a Pr 3+ doped Sr 2 Ga 2 GeO 7 tunable ML material is reported. Due to the traps resulting from unequal substitution of Pr 3+ –Sr 2+ in [SrO 6 ] heptahedra, the deep/shallow traps redistribution occurs towards a multicolor ML from red to green. In addition, even after continuous friction sliding force (15 N), the ML intensities can be recovered after ultraviolet pre-irradiation, indicating that Sr 2 Ga 2 GeO 7 : Pr 3+ has excellent ML emission stability. Based on thermoluminescence analysis, potential PersL and ML mechanisms are further elaborated by a lattice engineering (trap regulation) strategy. In all, the development of single-ion doped multicolor ML materials may have crucial research value and show a variety of potential applications in the fields of anticounterfeiting and information encryption.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yongming Guo,Tiancheng Fang,Jie Li,Zurong Chen,Yubin Xiang,Tao Tao
Yellow-green emissive carbon quantum dots (CQDs) were synthesized via the pyrolysis of sodium citrate and urea in the air. The as-synthesized CQDs manifested bright fluorescence with a maximum emission peak at 520 nm, a quantum yield of 8.43%, excellent photostability, and outstanding stability in high-salt conditions. The CQDs were used for the selective detection of sunset yellow (SY). The presence of SY resulted in a remarkable reduction in the fluorescence of the CQDs, which was caused by the inner filter effect. A good linear relationship was achieved in the range of 0-30 uM with a limit of detection of 0.22 uM. Additionally the CQDs were exploited in anti-counterfeiting and the fabrication of light-emitting diodes with satisfactory performance.
研究领域:
材料科学
·
分析化学
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光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tengning Ma,Hong Luo,Weiyuan Zhou,Huijuan Zhang,Rui Yuan,Qing He,Ying Huang,Li Yang,Guanjun Chang
Counterfeiting and information leakage have become critical global challenges, exacerbated by rapid technological advancements. This study presents a novel stimuli-responsive polymer, poly(imino sulfone) (PIS), synthesized via a simple C-N coupling reaction. The findings reveal that PIS exhibits fast, high-contrast, reversible color and fluorescence dual-mode stimuli-response, driven by the protonation-deprotonation of imine groups under varying acid-base conditions. Additionally, the rigid polymer structure, coupled with strong hydrogen bonding, imparts PIS excellent thermally stable (T 5% = 463 °C, T g = 245 °C), surpassing other polymers with stimulus-responsive discoloration capabilities. Notably, even at low concentrations (0.1 wt%), PIS demonstrates strong emission performance and stimulus-induced color-change behavior. The information encoded using PIS can be efficiently and repeatedly encrypted and decrypted under acid-base stimuli, thereby enhancing the confidentiality and security of the information. When integrated into polymer matrices, PIS not only imparts quick, stable and reversible dual-mode stimulus-responsive behavior but also enhances the thermal and mechanical properties of the host materials. The resultant PIS-based patterns exhibit excellent anti-counterfeiting performance. These unique properties position PIS as a promising candidate for advanced anti-counterfeiting and encryption applications.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 46
·465601
·
IF 2.9
Wei Yang,Site Luo,Yang He,Han Wang,Haihu Yu
Amorphous arrays assembled from colloidal microspheres are a way that obtains angle-independent structural colors. In order to obtain additional properties, colloidal microspheres, which are constituent units, can be modified with other materials. Here, we utilized the silane-functionalized carbon quantum dots (SiCDs) by incorporating them into the Stöber reaction to fabricate Fe3O4@SiO2/SiCDs nanospheres with a core–shell structure. Amorphous colloidal arrays (ACAs) were constructed on commercial printing paper using Fe3O4@SiO2/SiCDs nanoparticles as structural units by a simple permeation assembly. Macroscopically, the prepared ACAs exhibit the magnetic properties of Fe3O4, while under sunlight, they display bright, angle-independent structural colors. Under ultraviolet light, the array shows significant fluorescence. This enables the presentation of multidimensional information under varying magnetic and lighting conditions. By adjusting the thickness of the outer SiO2/SiCDs composite layer, the optical properties and magnetism can be controlled easily. Moreover, due to the strong light absorption capability and high refractive index of Fe3O4, the digital patterns constructed with Fe3O4@SiO2/SiCDs nanospheres demonstrate excellent multi-level anti-counterfeiting characteristics, even under water exposure. The magnetic properties of Fe3O4@SiO2/SiCDs nanospheres, along with their distinct display characteristics under different optical environments, suggest their wide applicability in the fields of multifunctional anti-counterfeiting pigments, bioimaging, and sensing displays.
研究领域:
材料科学
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光学
·
纳米技术
·
防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Fei Liu,Yuhan Sun,Ze Wang,Bo Li,Shichao Niu,Junqiu Zhang,Zhiwu Han,Luquan Ren
Antireflection (AR) surfaces are essential for the fields of flexible displays, photovoltaic industry, medical endoscope, intelligent windows, etc. Although natural creatures with well-organized micro/nanostructures have provided some coupling design principles for the rapid development of bioinspired AR materials, the mechanical vulnerability, poor flexibility, and nonadjustability have been pointed out as the drawback of these nanostructures. Here, a bioinspired reversible AR film with 4% reflectivity, 90% transmittance, and 9% haze in broadband (400–900 nm) was prepared. The flexible switching of AR performance enhancement and weakening throughout the visible wavelength band has been achieved by controlling the reversible change in the morphology of the interface structure. A variety of patterned film samples can be obtained by simply changing the template, which can be used in intelligent identification fields such as anticounterfeiting. The cycle test and photoelectric test show that the bionic reversible antireflection structure has certain stability and can effectively reduce the loss of photovoltaic cell conversion efficiency caused by mechanical deformation. It has broad application prospects in the fields of anticounterfeiting, intelligent window, flexible display, photoelectric element, and so on.
研究领域:
材料科学
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光学工程
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
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
·
光学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yiming Gou,Zejun Cao,Chunhua Ge,Rui Liu,Han Xu,Fengqi Li,Xiangdong Zhang
Research on fluorescent composites based on phase change materials is currently a hot topic. In this study, we reported the synthesis of N,N’-bis(1-octylheptadecyl)-3,4,9,10-perylenetetracarboxydiimide (PDI-C8) from perylene-3,4,9,10-tetracarboxylic dianhydride (PDI) and heptadecyl-9-amine. Two types of PDI-C8 paraffin fluorescent materials were developed: PDI-C8/paraffin composites and PDI-C8 paraffin emulsion via the Phase Inversion Composition (PIC) method. The structure, composition, and fluorescence properties of PDI-C8 were studied using NMR, MS, FT-IR, UV and FL, respectively. The photothermal conversion performance of the PDI-C8/paraffin composites was investigated. Results showed improved photothermal conversion with increased PDI-C8 contents, suggesting potential applications in solar thermal energy utilization and storage. The two fluorescent materials were characterized using DSC and FL. The photoluminescence phenomena of PDI-C8 paraffin fluorescent materials with different PDI-C8 contents all exhibit temperature-controlled characteristics. Based on the properties, a fluorescent thermometric paper was developed. Moreover, the utility of the two fluorescent materials extends to fields like anti-counterfeiting identification and encrypted writing.
研究领域:
材料科学
·
光学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
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
✓ 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）