OPTICS LETTERS
·
2021
·Vol. 46
·期 16
·3829-3832
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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
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12342-12347
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IF 2.7
Yu Qi,Chengyue Xin,Wenjun Zhang,Zhongfa Li,Zihan Chen,Zhongyu Duan
Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites with excitation wavelength-dependent tunable color have been synthesised by a simple precipitation method at room temperature, with two luminescent centres originating from the Te4+ and the STE (self-trapping exciton) of the Cs2ZrCl6 itself, respectively. They exhibit two different emission characteristics at 254 nm and 365 nm excitation wavelengths. At an excitation wavelength of 254 nm, the emission characteristics allow Te4+-doped Cs2ZrCl6 to exhibit tunable emission from blue to white to yellow under the control of Te4+ doping. And the excitation wavelength of 365 nm shows yellow emission. Te4+ doped Cs2ZrCl6 phosphors were used for optical anti-counterfeiting, and the anti-counterfeiting patterns were well distinguished under 254 nm and 365 nm UV lamps, demonstrating the potential of this excitation wavelength-dependent tunable color material for optical anti-counterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Qi-Hua Yang,Han-Qi Wei,Shu-Juan Zhao,Gui-Hua Li,Xuan Liu,Le Fu,Zhi-Wei Luo,Jia-Yong Si,Ge-Mei Cai
In recent years, the proliferation of counterfeit products has led to increased concerns about anti-counterfeiting technology, with traditional single-mode fluorescence methods proving insufficient due to their susceptibility to replication. The new copper-based halide materials have shown great potential in the field of multi-mode anti-counterfeiting due to their unique structure, excellent luminescence performance, and high defect tolerance. In this work, near-infrared emission of Cs 3 Cu 2 I 5 was achieved for the first time through Bi doping. By exploiting the dual emission center characteristics of the resulting Cs 3 Cu 2 I 5 :Bi, we demonstrated its excitation wavelength-dependent emission. It was then mixed with cyclohexane to prepare an advanced fluorescent anti-counterfeiting coating for screen printing, enabling high-precision pattern printing onto various substrates. The resulting anti-counterfeiting patterns exhibit excellent weather resistance, remaining virtually unchanged after 60 days at room temperature. This study lays the foundation for expanding the emission range of Cs 3 Cu 2 I 5 and adjusting multi band emission, and confirms its potential application in the field of multi-mode anti-counterfeiting.
研究领域:
材料科学
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光学工程
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防伪技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Zhao Dianlong,Li Shunxin,Su Yang,Qin Jiajun,Xiao Guanjun,Shang Yuchen,Yin Xiu,Lv Pengfei,Wang Feng,Yang Jiayi,Liu Zhaodong,Lan Fujun,Zeng Qiaoshi,Zhang Lijun,Gao Feng,Zou Bo
Current optical anti-counterfeiting technologies are mainly limited to materials with multicolor emissions, where the encryption method is only through photoexcitation. It brings about a huge risk for counterfeiting once these materials are reproduced. Here, we introduce a robust pressure encryption as the pressure engineering secret key to strengthen current optical anti-counterfeiting technique from pressure-induced emission luminogens. Through loading different pressures, the initially non-emissive 0D hybrid halide (C 7 H 11 N 2 , 4DMAP) 2 ZnBr 4 shows at least 8 different distinct bright emission colors. These color changes are attributed to controllable tuning of charge transfer and local excitation implemented by pressure treatment. Moreover, the unique color tuning through pressure loading, randomized distribution of the fluorescent particles, as well as designated micro-nano patterns greatly enhance the security capability of current visual information encryption, which serves as the triple-level physically uncopiable optical anti-counterfeiting technique. Our work provides a promising strategy of materials-by-design for high-performance anti-counterfeiting, imaging and information storage applications.
研究领域:
材料科学
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光学工程
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信息安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Hui Peng,Wei Tian,Qilin Wei,Linghang Kong,Guang Dai,Jialong Zhao,Bingsuo Zou
Recently, Sb 3+ -activated 0D Zr(IV)-based metal halides have gained enormous attention for their unique optical properties. However, realizing efficient white emission and multiple reversible emissions in a single system remains a great challenge. Parallelly, the currently reported Sb 3+ -activated Zr(IV)-based organic metal halides are mainly through aimless regulation of the type of A-site organic cations, severely limiting their development. Herein, all-inorganic Cs 2 ZrCl 6 :Sb 3+ is employed as the conformational model, three different compounds of Sb 3+ -doped [18-crown-6@A] 2 ZrCl 6 (A = K, Rb, Cs) are developed via supramolecular assembly. All compounds show efficient tunable white emission with luminous efficiency of 91.28% for [18-crown-6@K] 2 ZrCl 6 :Sb 3+ , 84.84% for [18-crown-6@Rb] 2 ZrCl 6 :Sb 3+ , and 78.63% for [18-crown-6@Cs] 2 ZrCl 6 :Sb 3+ , which shall stem from Sb 3+ -induced multi-exciton emission in [SbCl 6 ] 3− octahedron. Particularly, the strong supramolecular interaction can enhance the structural rigidity and suppress nonradiative transitions, which is the dominated reason for [18-crown-6@A] 2 ZrCl 6 :Sb 3+ exhibits efficient emission. The component/excitation/temperature/moisture-dependent multiple reversible PL switching characteristics are observed in Sb 3+ -doped [18-crown-6@A] 2 ZrCl 6 , which allows to demonstrate their applications in advanced optical anti-counterfeiting and information encryption. Moreover, a single-component white light-emitting diode is also fabricated, which shows a high color rendering index of 96.1. Therefore, the work provides a feasible scheme for designing organic Zr(IV) halides with fascinating optical properties.
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 Materials Chemistry C
·
2024
·Vol. 12
·期 18
·6645-6652
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IF 5.7
Feng-Yi Wu,Yuan-Sheng Cheng,Kong-Lin Wu,Rong Wu,Rui Yu,Ping-Li Guan,Yu-Wen Cheng,Wen-Jiang Li,Ji-Liang Yang,Xian-Wen Wei
Developing an ideal luminescent material with exceptional performance in various aspects, such as affordability, low toxicity, high photostability and security, is vital for advanced optical anti-counterfeiting. Here, halogen-doping-dependent luminescence MoS2 quantum dots were synthesized via a simple hydrothermal method for optical anti-counterfeiting ink. The results show that F−, Cl− and Br− doping results in notable fluorescence blueshifts of MoS2 quantum dots and significant enhancements in the photoluminescence quantum yield (PLQY) of up to 5.7, 5.0, and 3.2 times, respectively. However, I− incorporation causes a fluorescence redshift and a 25% decrease of PLQY. This mechanism is elucidated using density functional theory (DFT) and experiments. Specifically, F−, Cl− and Br− doping localizes surface electrons and blocks sulfur vacancies in MoS2 quantum dots, enhancing the release of neutral excitons from trions and defect-bound excitons. Conversely, I− doping increases the surface charge and sulfur vacancies, favouring the conversion of neutral excitons into trions and defect-bound excitons. The halogen-doped MoS2 quantum dots are engineered as security ink, demonstrating high concealment, excellent photostability and easy fabrication. The study offers a novel way of tailoring fluorescence of MoS2 quantum dots, potentially extending to other transition metal dichalcogenide quantum dots and their optical anti-counterfeiting implementation.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
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2025
·
IF 6.4
Jianhao Zheng,Pengye Du,Ran An,Yuan Liang,Yi Wei,Shuyu Liu,Pengpeng Lei,Hongjie Zhang
Optical anti-counterfeiting technology based on the multicolor emission generated by the abundant energy levels of rare earth ions shows great potential in the face of increasing information security problems worldwide. However, it is not an easy task to achieve multi-channel orthogonal emissions in a single nanoparticle with a simple structure by a convenient method. In this work, we have successfully realized the tri-channel orthogonal emissions under three excitation wavelengths in NaErF4@NaYF4:Eu3+@NaBiF4:Yb3+,Tm3+ core@shell@shell nanoparticles. In our design, the interlayer NaYF4:Eu3+ plays the role of “one arrow aiming at three eagles”. First, it can enhance the upconversion luminescence intensity of NaErF4. Next, it makes the emission color of Er3+ change from red to green by the energy transfer process between Er3+ and Eu3+. Finally, it can produce red emission under 395 nm light excitation. This selective excitation strategy enables R-G-B tri-channel orthogonal emissions in a single nanoparticle by simply changing the excitation wavelength, which is very suitable for high level optical information encryption. This work provides a simple and effective method for the design of smart luminescent materials, showing great potential for multi-level anti-counterfeiting and information security.
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
Materials Today Chemistry
·
2025
·
IF 6.7
Qikai Wang,Cheng Ye,Yuhang Zhao,Wenwen Shi,Can Zhou,Jun Yan,Qiuhong Cui
Core-shell photonic microcapsules (PhMCs) have the advantage of rich structural color compared with homogeneous photonic crystal microspheres, and thus have higher application value. How to prepare structurally color controllable PhMCs with responsive functions is increasingly urgent, which is related to the possibility of further expanding their applications. In this report, we integrate microfluidic and controlled etching techniques to conveniently prepare structurally color controllable responsive PhMCs and successfully apply them in the fields of metal ion detection and optical anti-counterfeiting. Microfluidics endows PhMCs with controllable and homogeneous dimensions. Meanwhile, controlled etching gives PhMCs shells a controllable ratio of opal/inverse-opal structures. The fully-etched PhMCs were designed as metal ion detectors to identify the existence of metal ions in the solution through the change of structural color. Notably, the partially etched PhMCs have three structural colors of red/green/yellow, which is the first time that triple stop band gaps PhMCs have been prepared based on two materials. The triple information has been switched by adjusting the transmission/reflection modes and the temperature to explore the function of an optical anti-counterfeiting model. Our study provides a new path for the construction of functionalized PhMCs, and further expands its potential application value.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Shan shan Zhao,He-He Dong,Weichang Li,Lei Zhang,Shikai Wang,Chun Yu,Hu Li
Upconversion emission materials have many advantages, such as narrowband sharp line emission, excellent photochemical stability, and long lifespan. In particular, under 980 nm invisible laser-beam irradiation, materials with visible light upconversion luminescence have vital application value in optical anti-counterfeiting and laser displays. In this study, a library of upconversion phosphors of CaLaAl3O7:RE3+/Yb3+ (RE=Tm, Ho) was produced through a high-temperature solid-state reaction method. The powders exhibited different color emissions under different excited wavelengths. Under 980 nm laser excitation, Tm3+/Yb3+ co-doped phosphors exhibited upconversion emission of 474 nm blue light, which was attributed to the 1G4→3H6 transition of Tm3+, and the fitting slope of the upconversion luminescence intensity vs. laser-pump power density was n450-500=2.83, which indicated the three-photon absorption upconversion process. Additionally, Ho3+/Yb3+ co-doped phosphors had the strongest red emission at 660 nm, originating from the 5F4/5S2→5I8 transition of Ho3+, which belongs to the two-photon absorption process. Subsequently, the changes in chromaticity coordinates of the prepared samples were analyzed under different light excitations, and different light color emissions were observed. The color purities of Ho3+/Yb3+ and Tm3+/Yb3+ co-doped samples were 99.9% and 65.4%, respectively. Finally, we verified the practical application value of the prepared powder in the fields of multi-color luminescence optical anti-counterfeiting and laser displays. The results show that the produced phosphors have vital application potential in information security protection, optical data storage, and 3D laser displays.
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 35
·期 3
·2413903
·
IF 18.5
Mengxin Yu,Yalin Zhai,Kai Xu,Ruijie Song,Peng Wan,Daning Shi,Caixia Kan,Xiaosheng Fang,Mingming Jiang
Low-dimensional ternary silver halide (CsAg 2 I 3 ), an emerging inorganic lead-free perovskite, has garnered significant scientific attention due to its strong quantum confinement effects, wide bandgaps, non-toxicity, and others. However, the photophysical properties and optoelectronic performance of CsAg 2 I 3 materials and devices are significantly compromised by crystal quality and defects arising from liquid-phase preparation. Herein, 1D CsAg 2 I 3 single crystals newly grown by the chemical vapor deposition method are reported. These crystals display exceptional quality and stability over a 3-month period despite exposure to air and moisture. The high in-plane anisotropic structure, phonon vibrations, and refractive index of CsAg 2 I 3 crystals are also experimentally elucidated. Polarization-sensitive ultraviolet photodetector based on the CsAg 2 I 3 monocrystal features a responsivity of 139 mA W −1 , a specific detectivity of 1.05 × 10 11 cm Hz 1/2 W −1 , an ultra-fast photoresponse speed of 48.2/69.1 µs, and a dichroic ratio of 2.66 upon 360 nm irradiation at −5.0 V bias. The photodetector excels amongst its competitors, moving toward the potential application of rapid optical anti-counterfeiting identification. This work, which leverages grown high-crystalline and highly stable CsAg 2 I 3 monocrystals, holds promises for advancing this functional material into a robust next-generation optoelectronic devices capable of probing sensitive optical sensing and specific azimuth recognition.
研究领域:
材料科学
·
光电子学
·
物理化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xia Xu,Liming Yang,Yanjun Cui,Bing Hu
Anti-counterfeiting has become a crucial global issue. Traditional anti-counterfeiting technology is easy to be imitated because of its low security, so it is urgent to develop an optical information encryption strategy with higher security level. In this study, a multi-key optical anti-counterfeiting and information storage strategy based on upconversion nanocrystals (UCNPs) and metal chlorides under multi-mode excitation-emission is proposed. Based on the optical properties of four orange luminescent materials (OLM), the distinguishable excitation mode (UV, NIR) and good afterglow characteristics are used to encrypt, decrypt and store real information. Finally, based on this characteristic, we propose an information encryption strategy for binary digit-ASCII encoding and digital information display. Under the irradiation of 254 nm excitation light, the real information is hidden, the “excitation wavelength key” and “capture time key” are used to read the correct information. This multi-key anti-counterfeiting strategy hides real information by interfering with information, which greatly improves the security level of anti-counterfeiting and is very promising in anti-counterfeiting applications.
研究领域:
材料科学
·
光学工程
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Jingye Yan,Yibin Lin,Jiaxin Li,Guoyi Pan,Jiaying Zhang,Jieheng Zhang,Wenjing Lin,Xiaofeng Lin,Yingjuan Sun,Guobin Yi
Multi-responsive re-writable photonic paper (MRPP) with inverse opal structure was prepared by introducing [poly(hydroxyethyl methacrylate)-poly(dimethylamino ethyl methacrylate)-poly(N-isopropyl acrylamide)] (PHEMA-PDMAEMA-PNIPAM) multi-responsive gel (MRH) into silica (SiO 2 ) photonic crystal (PC) template. First, monomers such as HEMA, DMAEMA, and NIPAM were filled into the SiO 2 PC template. Then, MRPP with dynamic responsive color change capability was prepared by ultraviolet (UV) curing and hydrofluoric (HF) etching. MRPP has temperature, pH, ionic strength, and ethanol concertration responsiveness, fast wetting capability (∼1.4 s), strong re-writability (∼600 cycles), and the ability to use inorganic salt solution as an environmental-friendly ink to achieve panchromatic adjustment. Based on the multiple responsiveness of MRPP and its difference in solvent volatility, a time–temperature dependent optical anti-counterfeiting system with higher security level and fast identification of encryption was successfully constructed. The excellent performance of MRPP indicates its great application value in the field of re-writable photonic paper as well as information security.
研究领域:
材料科学
·
信息学
·
光学工程
✓ 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）