检索结果-南通市图书馆

Nano Research 2019年第6期12卷 1417-1422页

作者： Wenwu You Datao Tu Renfu Li Wei Zheng Xueyuan Chen CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Lanthanide-based luminescent anti-counterfeiting materials are widely used in various kinds of ***,the emission color of traditional lanthanide-based luminescent materials usually remains nearly unaltered upon different excitation lights,which may only work for single-level ***,the NaYbF4∶2%Er@NaYF4 core/shell nanoplates (NPs) with "chameleon-like" optical behavior are *** NPs display single-band red or green downshifting (DS) emission upon excitation at 377 or 490 nm,*** 980 nm excitation,the color of upconversion (UC) emission can be finely tuned from green to yellow,and to red with increasing the excitation power density from 0.1 to 4.0 W/cm^*** proposed materials readily integrate the advantages of excitation wavelength-dependent DS single-band emissions and sensitive excitation power-dependent UC multicolor emissions in one and the same material,which has never been reported ***,the proposed NPs exhibit excellent performance as security labels on trademark tag and security ink on painting,thus revealing the great potential of these lanthanide-doped fluoride NPs in multilevel anti-counterfeiting applications.

关键词： lanthanide-doped chameleon-like upconversion downshifting multilevel anti-counterfeiting

Multiple anti-counterfeiting strategy by integrating up-conversion,down-shifting luminescence, phosphorescence and photochromism into Na YTiO4: Bi/Er phosphors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第35期130卷 219-226页

作者： Yuzhen Wang Xuanyi Yuan Yongge Cao Chaoyang Ma Songshan Lake Materials Laboratory Dongguan 523808China Department of Physics Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

With the rapid development of science and technology,the high-security-level anti-counterfeiting technique is essential for ensuring property or information *** this work,we prepared micron NaYTiO_(4):Bi/Er(NYT:Bi/Er) phosphors with integrating up-conversion(UC) photoluminescence,downshifting(DS) emission,phosphorescence and photochromism(PC) performances for advanced multiple anti-counterfeiting *** to the abundant energy levels of Er^(3+)ions,the UC and DS luminescence behaviors are ***,the yellow-green emission of Er^(3+)ions can be observed upon 980 nm excitation,and the bright green emission is demonstrated under 281 or 254 nm excitation due to the energy transitions of Er^(3+)ions and the energy transfer process from Bi^(3+)to Er^(3+)***,the introduction of Bi^(3+)ions generates defect levels in the matrix and thus leads to ***,the repeatable PC performance could be triggered by the 365 nm irradiation and vanished with 450 nm illumination or thermal *** verify the practical usability of NYT:Bi/Er phosphors on anti-counterfeiting applications,some experiments are designed and successfully *** is believed that the NYT:Bi/Er phosphors can be a promising candidate for high-security-level multiple anti-counterfeiting.

关键词： anti-counterfeiting Up-conversion Down shifting Phosphorescence Photochromism NaYTiO4 Bi/Er

A novel self-activated ultraviolet persistent luminescence material and its anti-counterfeiting application based on intensity and time resolution from persistent luminescence

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第9期40卷 1417-1423,I0003页

作者： Shanshan Peng Lin Liu Lizhen Wang Rui Rong Liang Song Weixiong You Junpeng Shi Yun Zhang Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

Recently,the ultraviolet(UV)persistent luminescence material(PLM)has attracted extensive ***,the design and development of new UV PLM and exploring their promising advanced application remain ***,we developed a new dopant-free self-activated UVA PLM,Zn_(2)Al_(2)SiO_(7),which could be applied in anti-counterfeiting ***_(2)Al_(2)SiO_(7)shows UVA persistent luminescence(PersL)peaking at 380 nm after 254 nm UV lamp *** of Yb^(3+),the UVA PersL intensity and time are raised obviously,and the UVA PersL time lasts more than 24 *** addition,Yb^(3+)-doped Zn_(2)Al_(2)SiO_(7)exhibits photostimulated properties with different light ***,we design anticounterfeiting pattern based on intensity and time resolution from PersL of Zn_(2)Al_(2)SiO_(7),showing its advantages in the anti-counterfeiting field.

关键词： Persistent luminescence Ultraviolet anti-counterfeiting Self-activated Rare earths

Five-level anti-counterfeiting based on versatile luminescence of tri-doped double perovskites

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第11期17卷 9971-9979页

作者： Xingru Yang Yuhang Sheng Linglong Zhang Lun Yang Fangjian Xing Yunsong Di Cihui Liu Fengrui Hu Xifeng Yang Guofeng Yang Yushen Liu Zhixing Gan Center for Future Optoelectronic Functional Materials School of Computer and Electronic Information/School of Artificial Intelligence Nanjing Normal University Nanjing 210023 China College of Physics Nanjing University of Aeronautics and Astronautics Key Laboratory of Aerospace Information Materials and Physics (NUAA) MIIT Nanjing 211106 China Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi 435002 China College of Engineering and Applied Sciences and MOE Key Laboratory of Intelligent Optical Sensing and Manipulation Nanjing University Nanjing 210093 China College of Electronic and Information Engineering Changshu Institute of Technology Suzhou 215500 China School of Science Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology Jiangnan University Wuxi 214122 China Yancheng Polytechnic College Yancheng 224005 China

Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn^(2+)/Yb^(3+)/Er^(3+) tri-doped Cs2Ag0.8Na0.2InCl6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn^(2+) d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn^(2+) and Er^(3+). After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn^(2+) and Er^(3+) ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn^(2+), Ln^(3+), and traps, laying a solid foundation for future development of new lead-free perovskites.

关键词： anti-counterfeiting photoluminescence self-trapped excitons upconversion

Multicolor luminescence of hexagonal NaYF_(4):Yb^(3+)/Ho^(3+)/Ce^(3+) microcrystals with tunable morphology under 940 nm excitation for temperature-responsive anti-counterfeiting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第3期40卷 406-414,I0002页

作者： Lingna Xu Hongyan Zheng Tao Pang Junwen Mao College of Science Huzhou UniversityHuzhou 313000China

In this study,the hexagonal NaYF_(4):Yb^(3+)/Ho^(3+)/Ce^(3+) microcrystals were synthesized controllably,and upconversion luminescence excited at 940 nm and its application in temperature-responsive anti-counterfeiting are *** is clarified that the Ln^(3+)(Ln=Y+Yb+Ho+Ce)density ratio of bottom plane to side plane in the unit cell can be regulated by Ce^(3+) *** is also proved that the energy transfer of Yb^(3+) to Ho^(3+) is responsible for the activation of Ho^(3+)under 940 nm excitation,while the cross relaxation between Ho^(3+)and Ce^(3+)participates in the redistribution of electron population of^(5)S_(2)/^(5)F_(4)and^(5)F_(5)*** theory and experiment confirm that the intensity ratio of red to green emission(I_(R)/I_(G))as a function of temperature as an independent variable has good linear characteristics in the temperature range of 300-500 *** to the good responsiveness of multicolor luminescence to temperature,the hexagonal NaYF_(4):Yb^(3+)/Ho^(3+)/Ce^(3+) with tunable morphology is a promising candidate for advanced temperature-responsive upconversion *** results provide a new pathway for the controllable synthesis of hexagonal NaYF_(4)microcrystals as well as the regulation of upconversion luminescence that is excited by wavelengths other than 980 nm and its application in anti-counterfeiting.

关键词： Upconversion luminescence Color regulation anti-counterfeiting Rare earths

Dual-mode emission of single-layered graphene quantum dots in confined nanospace： anti-counterfeiting and sensor applications

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第4期11卷 2034-2045页

作者： Liqian Bai Ning Xue Yufei Zhao Xinrui Wang Chao Lu Wenying Shi ing University of Chemical Technology 15 Beisanhuan East Road Beijing 100029 China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Beijing Key Lab of Plant Resource Research and Development Beijing Technology and Business University Beijing 100048 China

Engineering of the luminescent properties for graphene quantum dots （GQDs） presents two enormous challenges： 1） The bandgap of GQDs is mainly determined by structural defects （size, shape, and the fraction of sp2 and sp3 domains）, which results in non-stoichiometric nature; 2） the preparation methods limit the achievement of an accurate chemical structure of GQDs, leading to many controversial explanations over the relationship between the structural defects and bandgaps. Here, single-layered GQDs with an exact structure are obtained by in-situ reaction of intercalated precursors in the confined nanospace of layered double hydroxides （LDHs）. Subsequently, the structure-property relationship is uncovered, demonstrating the enhanced fluorescence and activated room temperature phosphorescence of the as-pre- pared GQDs-LDHs, which originate from synergistic effects： 1） strong confine- ment provided by the nanospace of LDHs; 2） rich O-containing functional groups on the surface of GQDs resulting from LDH catalysis. Moreover, the colorless nature and dual-emission characteristics of GQDs-LDHs satisfy the preconditions as anti-counterfeiting markers for protecting valuable documents （bank notes, commercial invoices, etc.）. Particularly, owing to the low toxicity of GQDs and the edible property of LDHs, the GQDs-LDHs/gelatin capsules could be the new generation of potential green anti-counterfeiting material in the field of food and drugs.

关键词： graphene quantum dots dual-mode emission confinement sensors anti-counterfeiting

Sustainable curcumin-based smart tough fluorescent hydrogels for anti-counterfeiting applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Chemical Engineering 2023年第4期4卷 379-386页

作者： Xiubin Xu Chuanghong Xiao Yanting Chen Danfeng Yu Yu Lu Ian Wyman Xu Wu School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou510006China Department of Chemistry Queen's UniversityKingstonOntarioK7L 3N6Canada

There is currently great interest in developing an environment-friendly,low-cost,and scalable approach for producing stimuli-responsive fluorescent hydrogels(FHs)with excellent mechanical property,rewritable fluorescence,and dual anti-counterfeiting ***,by applying natural,environment-friendly,and sustainable curcumin as a responsive agent,tough pH-responsive FHs(pH-FHs)are fabricated via a facile preparation *** materials have outstanding mechanical performances:ultimate stress of 180 kPa,an ultimate strain of~2500%,and good anti-fatigue performances against *** pH-FHs are able to sense ammonia and formaldehyde gas,resulting in both a color change and fluorescence for dual anti-counterfeiting *** sensing information is stored individually by the pH-FHs and could be externally removed using formaldehyde gas to achieve a rewritable *** study provides valuable insights that are expected to facilitate the development of smart FHs for information encryption and anti-counterfeiting applications.

关键词： Curcumin Fluorescence hydrogels anti-counterfeiting Information storage Rewritable fluorescence

Synthesis of Thin Film of a Three-Dimensional Covalent Organic Framework as anti-counterfeiting Label

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第10期40卷 1171-1176页

作者： Xin Dong Jing Yang Honglei Wang Pei Zhao Fanglin Tan Zhipeng Zhou Zhaowei Ou Li Gong Wei Liu Xudong Chen Zhikun Zheng Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistryand State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen UniversityGuangzhouGuangdong 510275China Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Key Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouGuangdong 510275China Instrumental Analysis and Research Center Sun Yat-sen UniversityGuangzhouGuangdong 510275China

Film plays a key role in the sustainable development of our *** thin films of two-dimensional covalent organic frameworks(coFs)have been produced by interface,spin coating,microwave-assisted synthesis,and screen printing methods and are applied in nanofitration,molecular separation,photochemical sensing,anion transport,heat conduction,and proton *** the other hand,the synthesis of their three-dimensional(3D)analogues and subsequent integration in devices remains ***,self-supporting thin films of a three-dimensionai COF with tunable thickness was created by a stearic acid mediated synthesis methodology on water surface at room temperature in *** film could be transferred onto arbitrary substrate,and when supported on indium tin oxide glass,it exhibited irreversible *** optical feature made it act as a one-time anti-counterfeiting label in an electrochemical *** work will inspire the synthesis of thin films of 3D COFs as well as other 3D materials,and boost their property and application exploration.

关键词： Thin films Interfaces Electrochromism anti-counterfeiting Covalent organic frameworks

Ultralong Organic Phosphorescence of Triazatruxene Derivatives for Dynamic Data Encryption and anti-counterfeiting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第18期41卷 2261-2268页

作者： Baoshuai Liang Wei An Jie Liu Yu Dong Shiyu Feng Weiguo Huang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China FuzhouFujian 350002China University of Chinese Academy of Sciences 19A Yuquan RoadBeijing 100049China

Comprehensive Summary,Organic luminogens with persistent room temperature phosphorescence(RTP)have drawn tremendous attentions due to their promising potentials in optoelectronic devices,information storage,biological imaging,and *** this work,six triazatruxene-based lumiogens with different peripheral substituents and configurations are synthesized and systematically *** results show that their fluorescence quantum yields in solid states range from 15.73%to 37.58%.Dispersing the luminogens as guest into the host(PPh_(3))could turn on the persistent RTP,where PPh_(3)acts as not only a rigid matrix to suppress the non-radiative transitions of the guest,but also provides energy transfer channels to the *** maximum phosphorescence efficiency and the longest lifetime could reach 29.35%and 0.99 s in co-crystal films of 6-TAT-CN/PPh_(3)and 5-TAT-H/PPh_(3),***,these host-guest co-crystalline films exhibit great potentials in advanced dynamic data encryption and *** work deepens the insight for low cost,halogen-free,and facile fabrication of all-organic persistent RTP materials.

关键词： Room temperature phosphorescence Host-guest systems Energy transfer Data encryption anti-counterfeiting Fluorophores

Monitoring of Sweat pH and Dual-Mode anti-counterfeiting from Metal-Organic Framework-Based Multifunctional Gel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第5期42卷 491-498页

作者： Xiangnan Wang Hongli Zhang Jiahe Li Gang Zou Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui230026 China

Monitoring of sweat pH plays important roles in physiological health,nutritional balance,psychological stress,and sports ***,the combination of functional MOFs with phosphorescent material to acquire the real-time physiological information,as well as the application of dual mode anti-counterfeiting,has seldom been ***,we developed multifunctional gel films based on MOFs and phosphorescent dyes which responded to H+ions and the related mechanism was studied in *** exposure to H+,the composite gel film exhibited decreased fluorescent signal but enhanced room temperature phosphorescence(RTP),which could be utilized for sweat pH sensing through a ***,multifunctional gel films exhibited a potential application in information encryption and anti-counterfeiting by designing of stimulus responsive multiple *** research provided a new avenue for portable and non-invasive sweat pH monitoring methods while also offering insights into stimulus-responsive multifunctional materials.

关键词： Metal–Organic Frameworks Room-temperature phosphorescence Fluorescence Sweat pH monitor anti-counterfeiting Yttrium Polymer composites Luminescence