CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jinxing Zhao,You Zhang,Taian Wang,Li Guan,Guoyi Dong,Zhenyang Liu,Nian Fu,Fenghe Wang,Xu Li
Anti-counterfeiting technology is of great significance to information security. To obtain high-quality anti-counterfeiting materials, the developments of inorganic materials are crucial. In this paper, a series KGaSiO 4 : x Eu 3+ phosphors with persistent luminescence, photoluminescence , and thermochromic have been successfully prepared and the application of quadruple anti-counterfeiting is realized. The X-ray diffraction and Rietveld refinement indicate that the phosphors are pure phase. With Eu 3+ ions doping, the structure change, site occupancies, and color-tunable phenomenon are carefully investigated. Different from another Eu 3+ doping phosphor, the emission of KGaSiO 4 :0.2% Eu 3+ phosphor changes with the excitation light in the region of 240 nm–306 nm. The emission color can be modulated with the surrounding temperature. Surprisingly, this phosphor can emit green afterglow light, which is attributed to the different luminescent properties of the matrix and doping of Eu 3+ ions. The series of phosphors exhibit abundant luminescent properties. Based on their wavelength dependence, concentration quenching, long afterglow, and thermochromic properties, the KGaSiO 4 : x Eu 3+ phosphors can be effective materials for quadruple-modal anti-counterfeiting devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zeinab Marfavi,Ruihao Yang,Lingbo Wei,Yijun Han,Quanjie Lv,Yingfan Dai,Kang Sun,Congli Yuan,Ke Tao
Day–night photocatalysts that can persistently generate reactive oxygen species (ROS) after ceasing light attracted intensive attention in diverse fields. However, current strategies of combining a photocatalyst and an energy storage material can hardly fulfill the demands, especially in size. We herein present a one-phase sub-5 nm day–night photocatalyst via simply doping Nd, Tm, or Er into YVO4:Eu3+ nanoparticles, efficiently producing ROS in both day and night modes. We demonstrate that the rare earth ions acted as a ROS generator, and Eu3+ and defects contributed to the long persistency. Furthermore, the ultrasmall size led to remarkable bacterial uptake and bactericidal efficacy. Our finding suggests an alternative mechanism of day–night photocatalysts that could be ultrasmall and thus may shed light on disinfection and other applications.
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Zhenggang Zou,Tingting Guo,Guoliang Gong,Fulin Lin,Yijian Sun,Jianhui Huang,Jinsheng Liao,Herui Wen
The partially and equivalent substitution of La + Mg → Sr + Al in SrAl 12 O 19 lattice is an effective strategy to provide trivalent sites, reduce the site occupation splitting of Al and stabilize the entire lattice. When excited by 397 nm, the Eu 3+ activated La, Mg:SrAl 12 O 19 (ASL) phosphor shows intense linear emission through the 5 D 0 → 7 F 4 transition at 707 nm when compared with SrAl 12 O 19 :Eu 3+ . Especially, the Eu, Mg co-doped Sr 1-x La x Mg x Al 12-x O 19 with certain amount of x = 1/3 exhibits the significant intense photoluminescence, which was demonstrated through a lattice evolutional model. Eu 2+ in the host with 1/3 ratio of (La, Mg) substitution shows broad blue emission and as short fluorescence lifetime as 248 ns. The temperature-depended fluorescence quenching behavior confirms the essence of strong electric-phonon coupling originated from distorted and polarized crystal field around Eu 2+ /Sr 2+ site. Basing on site regulation of SrAl 12 O 19 matrix, our study provides a reference for exploration on efficient rare earth ions activated luminescent laser or scintillation materials.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 13
·3974-3982
·
IF 7
Tianshe Yang,Luo Guo,Hao Wang,Xueli Xu,Peilin Wu,Ning Zhang,Xiangmei Liu,Shujuan Liu,Qiang Zhao
X-ray excited luminescence (XEL) of scintillators is significant for imaging applications in the fields of medical detection, information retrieval, and scientific research. In this case, lanthanide-doped rare-earth nanophosphors show potential as next-generation scintillators owing to their facile synthesis, high chemical stability and photostability, and adjustable XEL emission. In this study, a new type of XEL-enhanced NaLuF4-based nanophosphor was synthesized by doping Tb3+ to sensitize the emission of Eu3+, facilitating the application of the as-prepared nanoscintillators for X-ray imaging on opaque samples and biological specimens. NaLuF4:Gd/Tb/Eu with 5% Tb-doping showed the highest XEL intensity owing to the energy transfer process between Tb3+ and Eu3+. The NaLuF4:Gd/Tb/Eu (10/5/15 mol%) nanoparticles exhibited an excellent scintillation performance with a high light yield of 15 313 photons MeV−1 and low detection limit of 84.1 nGyair s−1. The X-ray imaging test using the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film exhibited a high spatial resolution of 8.7 lp mm−1. Furthermore, the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film was applied in X-ray imaging with high contrast for a spring sealed in a capsule and a crab.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yinsheng Liu,Hao Guo,Ning Wu,Liping Peng,Mingyue Wang,Jiaying Tian,Jiaxi Xu,Wu Yang
Tetracycline (TC) abuse has caused a serious threat to human health and the ecological environment, so it is very important to develop the materials that can simultaneously detect and remove TC in animal feed and environmental water. In this present work, at first, an original oxygen-rich 2D nanoporous covalent organic framework (BrPz-COF) was synthesized by an irreversible condensation reaction of tetrabromo-1,4-benzoquinone and piperazine and then a rare-earth covalent organic framework (Ln@COF) was successfully obtained for the detection and removal of tetracycline by post-synthesis modification. The carbonyl group contained in BrPz-COF provides a large number of active sites for the binding of Eu3+ ions by post-synthetic modifications so that the resulting Eu3+@BrPz-COF hybrid shows a good chemical stability under harsh chemical conditions such as strong acid, strong base, and various organic solvents. The resulting Eu3+@BrPz-COF exhibited a turn-on response toward tetracycline, which allowed this interesting material to be applied as a fluorescence sensor. It is worth mentioning that the reusable sensor had a high sensitivity and excellent selectivity to TC, and the detection limit was 7 nM, which can be applied to detect TC in animal feed. In addition, Eu3+@BrPz-COF also showed a good performance in the removal of TC with the maximum adsorption amount of 205.34 mg·g–1. Metal-COF-based hybrid materials with the performances of simultaneous detection and removal of TC are rare, so this work is very significant for developing a material to solve this matter.
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高影响因子
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.
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高影响因子
CRYSTENGCOMM
·
2018
·Vol. 21
·期 2
·339-347
·
IF 3.304
Wenpeng Xia,Yufeng Zhang,Jie Xiong,Shanshan Hu,Jie Yu,Yanfei Zhang,Yuxin Wan,Jun Yang
A series of BaMgF4:Ce3+/Tb3+/Eu3+ phosphors were successfully prepared via a facile hydrothermal process. X-ray diffraction (XRD), energy dispersive spectrometry (EDS), scanning electron microscopy (SEM), n-UV–UV-vis photoluminescence (PL) and fluorescence decays were employed to investigate the structure, composition, morphology, luminescence properties and energy transfer processes. The as-prepared BaMgF4 phosphors exhibit a rod-like morphology and the size of the product can be effectively regulated by changing the amount of NH4F in the original solution. Under n-UV–UV light excitation, the Ce3+, Tb3+ and Eu3+ singly-doped BaMgF4 phosphors all show good characteristic luminescence; the Ce3+–Tb3+ and Tb3+–Eu3+ co-doped BaMgF4 phosphors both show tunable emission colors from blue (green) to green (orange-red) because of the energy transfer of Ce3+ → Tb3+ and Tb3+ → Eu3+, respectively. Moreover, the efficient energy transfer from Ce3+ (Tb3+) to Tb3+ (Eu3+) ions in the co-doped samples was confirmed by investigating the excitation/emission spectra and decay lifetimes. The results indicate that the phosphors may be potentially used as single-component multi-color phosphors for white light-emitting diodes.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Lin Zhang,Fei Ma,Qingmei Guan,Chang Wang,Cuibing Bai,Liangquan Sheng
The flaky Bi 3+ sensitized Gd 2 O 2 SO 4 : Eu 3+ compounds were prepared from the sodium dodecyl sulfate intercalated layered rare-earth hydroxide by calcination at 800 °C. The precursor Gd (1.9-X) Eu 0.1 Bi X (OH) 5 NO 3 ·1.5H 2 O was fabricated by methanol-solvothermal reaction at 150 °C for 12h. XRD and TEM analyses demonstrated that the precursor LGdH were formed of crystallites with a uniform crystallographic orientation. After the anion DS − intercalated, the interlayer space of LGdH increased, but the layer structure did not change. Their single-crystal nature and sheet-like morphology were reserved after calcination, The excitation spectrum monitored by 612 nm featured a broad band at 332 nm which could be ascribed to the 6s 2 -6s6p transition of Bi 3+ , and, accordingly the flaky Gd 2 O 2 SO 4 :Eu 3+ ,Bi 3+ exhibited greatly enhanced characteristic red emission of Eu 3+ . The PL properties of the Gd 2 O 2 SO 4 :Eu 3+ ,Bi 3+ samples were measured at different concentrations of Bi 3+ and fixed Eu 3+ concentration 5 at%, and the highest PL quantum yield was 20.58% of Gd 2 O 2 SO 4 :Eu 3+ ,Bi 3+ at a Bi 3+ concentration of 4 at%.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 44
·24308-24315
·
IF 3.567
Leipeng Li,Xudong Qi,Feng Qin,Lu Li,Hong Gao,Yangdong Zheng,Zhiguo Zhang
A guideline for designing sensitive thermometry is proposed. It reveals that using two emission bands that possess the opposite change tendencies against temperature makes it easier to achieve a larger relative sensitivity. Based on the guidelines, a highly sensitive strategy for optical thermal detection that depends on the Tb3+-to-Eu3+ emission ratio is designed by exciting Eu3+/Tb3+'s unusual absorption lines. This can be easily driven by a commonly used and cheap 405 nm laser diode. Moreover, its maximum relative sensitivity reaches up to 2.02% K−1 at 610 K, one of the largest sensitivities reported so far.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 3
·1-10
·
IF 1.604
Liu Min,Kang Ming,Chen Kexu,Mou Yongren,Sun Rong
Integrating the processes of preparation of CaCO 3 :Eu 3+ and its surface-coating, core–shell structured CaCO 3 :Eu 3+ @SiO 2 phosphors with red emission were synthesized by the carbonation method and surface precipitation procedure using sodium silicate as silica source. The phase structure, thermal stability, morphology and luminescent property of the as-synthesized samples were characterized by X-ray diffraction, Fourier transform infrared spectrum, thermal analysis, field-emission scanning electron microscopy, transmission electron microscope and photoluminescence spectra. The experimental results show that Eu 3+ ions as the luminescence center are divided into two types: one is at the surface of the CaCO 3 and the other inhabits the site of Ca 2+ . For CaCO 3 :Eu 3+ @SiO 2 phosphors, the SiO 2 layers are continuously coated on the surface of CaCO 3 :Eu 3+ and show a typical core–shell structure. After coated with SiO 2 layer, the luminous intensity and the compatibility with the rubber matrix increase greatly. Additionally, the luminous intensity increases with the increasing of Eu 3+ ions concentration in CaCO 3 core and concentration quenching occurs when Eu 3+ ions concentration exceeds 7.0 mol%, while it is 5.0 mol% for CaCO 3 :Eu 3+ phosphors. Therefore, preparation of CaCO 3 :Eu 3+ @SiO 2 phosphors can not only simplify the experimental process through integrating the preparation of CaCO 3 :Eu 3+ and SiO 2 layer, but also effectively increase the luminous intensities of CaCO 3 :Eu 3+ phosphors. The as-obtained phosphors may have potential applications in the fields of optical materials and functional polymer composite materials, such as plastics and rubbers.
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高影响因子
ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Ruichan Lv,Liyang Xiao,Xue Jiang,Miao Feng,Fan Yang,Jie Tian
In this research, four steps including synthesis experiment, brightness evaluation, optimized calculation using brightness as fitness reference, and new calculated composition for the next preparation have been proceeded to find the brightest Eu3+ doped phosphors combined with chemical experiments and genetic algorithm (GA) calculation. The evolutionary operations, such as elitism, selection, crossover, and mutation, are applied to the compound combination. Feasible optimized combination would be obtained until the phosphor is found to be satisfactory. Through GA calculation and thd experimental process, the final luminescence enhancement factor of the optimal phosphor is up to 141% compared with the best one in the first generation. Thus, the GA calculation could be well applied to combinatorial chemistry to find the better phosphor. Additionally, the optimized phosphor is potentially applied as the fingerprint detection nanoparticle and dual-modal imaging agent of the CT/luminescent agent with high penetration and resolution.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu-Xi Bi,Dan Zhao,Shao-Jie Dai,Rui-Juan Zhang,Qing-Xia Yao
Ion doping is one of the most effective strategies to induce interesting luminescence properties of materials. In this work, the Bi 3+ and Eu 3+ are introduced into a ‘114’ host material YBaZn 3 GaO 7 (YBZG) to generate photoluminescence (PL), long-persistent luminescence (LPL) and colour change properties. The co-doped YBZG:0.003Bi 3+ / y Eu 3+ can generate multi-color emissions from green, through yellow to orange with the increasing of Eu 3+ concentration. There are F-like color centers around conduction band (CB) of YBZG host with shallow or deep energy levels. The electrons trapped by deep levels response to the PC properties, whereas these for shallow levels response to the LPL properties. The PC process from white to apricot is reversible. By alternating thermal treatment and irradiation, YBZG:0.003Bi 3+ was proved to have a good fatigue resistance of 3.1 %. For YBZG:0.003Bi 3+ /0.05Eu 3+ , it shows bright orange LPL emission when the irradiation is removed after 24 min. The achievement of this paper provides a design idea that if the host structure of a phosphor is of flexible and easy to occur defect, not only PL property, but also PC and LPL properties are probably able to realize.
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