JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 25
·1-14
·
IF 2.8
Qian Wanqing,Xu Qingliang,Yu Xueqing,Hussain Fayaz,Chen Xinhua,Su Weitao,Sun Shikuan,Song Kaixin
To develop new luminescent materials for optical thermometers, a series of Er 3+ /Eu 3+ doped double perovskite La 2 MgSnO 6 phosphors are synthesized by a high-temperature solid-phase method. The structure, luminescence performance, energy transfer, and thermal sensitivity are systematically studied by X-ray diffraction (XRD), scanning electron microscopy fluorescence spectroscopy, lifetime decay curve, and temperature-dependent emission spectra. The prepared samples possess good coincidence with pure perovskite phase, and the refined high-quality XRD data reveal that Eu 3+ and Er 3+ jointly occupy La 3+ sites. which is attributed to the effective energy transfer from Er 3+ to Eu 3+ ions. By adjusting the doping concentration of Eu 3+ , the emission of Er 3+ is attenuated and the luminous color is modulated from green to orange-red. These demonstrate the existence of energy transfer between Er 3+ and Eu 3+ . In addition, the optimized La 2 MgSnO 6 : 0.075Er 3+ , 0.04Eu 3+ phosphor exhibits excellent thermal stability and good temperature cycling. The emission intensity showed good cycling in the process of repeated heating and cooling, and maintained to 76% of the initial temperature (303K) at 403K. Studied the optical temperature sensing performance of LMS: 0.075Er 3+ , 0.04Eu 3+ fluorescent powder. The results of fitting the fluorescence intensity ratio with the non-thermal coupling characteristic peaks of 555 and 706nm showed excellent optical sensitivity, and the S a and S r were calculated as 0.0029K −1 and 1.21%K −1 , respectively. All results indicate that LMS: 0.075Er 3+ , 0.04Eu 3+ phosphors could have potential applications for non-contact optical temperature measurement materials.
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高影响因子
CELLULOSE
·
2025
·
IF 4.8
Yao Yiqing,Cheng Haibing,Han Juan,Wang Haifeng,Liang Zhijie
The development of cotton fabrics with exceptional and durable fluorescent properties has garnered significant attention. In this study, an enduring fluorescence cotton fabric was fabricated by a convenient and efficient approach. Interestingly, carboxyl reactive groups were employed as bridging agents to covalently link the raw fabric with Europium (Eu)-based polyoxometalate, thus guaranteeing the tight bonds between the polyoxometalates and the fabric matrix. The morphology and microstructures of composite fabrics were characterized and compared, demonstrating the successful integration of polyoxometalates into the fabric featuring covalent bonding interactions. Additionally, the fluorescence emissions of composite fabrics were investigated ( λ ex = 243 nm). The emission spectrum exhibits typical emission peaks of Eu 3+ and polyoxometalate, corresponding to the 5 D 0 → 7 F 0–4 transitions in the range of 550–750 nm and the O → W transition, which results in distinct red fluorescence. Moreover, the lifetime-decay behavior, monitored at an excitation wavelength of 243 nm, follows a single-exponential function, yielding a lifetime ( τ ) of 0.4 ms. More importantly, owing to the robust interaction between the components, the composite fabric demonstrates exceptional fastness properties, including resistance to washing (50 times washing), abrasion (under both dry and wet conditions), and sunlight (9 days). In particular, three kinds of shaped masks were used, highlighting its potential as a reusable anti-counterfeiting material. The plausible mechanisms of the system is attributed to the efficient electron transition and energy transfer processes within the composite structure. Besides, mechanical property reveal PW 11 Eu@CF almost inherits the original fabric’s mechanical property. This work provides a novel strategy for the controlled design and fabrication of polyoxometalate-based anti-counterfeit material.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Yuqing Deng,Shan Jiang,Zifei Yan,Youlu Chu,Weibing Wu,Huining Xiao
Radioactive uranium leaks into natural water bodies mainly in the form of uranyl ions (UO 2 2+ ), posing ecological and human health risks. Fluorescent europium-based metal-organic frameworks (Eu-MOFs) have been demonstrated to be effective fluorescent sensors for UO 2 2+ , but the large size, powder state and poor dispersity limit their further application. In this work, fluorescent Eu-MOFs were in-situ grown on TEMPO-oxidized cellulose nanofibers (TOCNFs), which is the first time that spherical Eu-MOF crystals with sizes below 10 nm were prepared. Fluorescence spectral analysis revealed a nine-fold increase in the fluorescence intensity of TOCNF@Eu-MOF compared to Eu-MOF. The nanocomposites achieved rapid and sensitive fluorescence quenching to UO 2 2+ through the “antenna effect” and unsaturated Lewis basic sites on the ligands binding with UO 2 2+ . Moreover, TOCNF@Eu-MOF demonstrated excellent selectivity and anti-interference for UO 2 2+ detection. For the nanopaper-based sensor made from TOCNF@Eu-MOF, the Stern-Volmer quenching constant ( K SV ) was calculated as 8.21 × 10 4 M −1 , and the lowest limit of detection (LOD) was 6.6 × 10 −7 M, significantly lower than the 1.32 × 10 −6 M of Eu-MOFs. In addition, the nanopaper exhibited good fluorescence stability and cyclic detection performance, enabling the rapid and convenient detection of UO 2 2+ in the aqueous phase within 30 s by simple dipping.
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PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Rongfang Yan,Ning Zhang,Weihua Liu,Xuelian Hu,Wenxiu Wang,Yiwei Tang,Shuo Wang,Xianghong Wang,Qinghai Sheng
Self-assembled Eu-dipeptide (tryptophan-phenylalanine) microparticles with multi-emission fluorescence was prepared and modified with a single-stranded DNA corresponding to the sulfamethazine (SMZ) adapter (Eu-PMPs@cDNA). Aptamer-functionalized magnetic Fe 3 O 4 (MNPs@aptamer) was used to specifically bind the target SMZ. Using Eu-PMPs@cDNA as fluorescent signal probe and MNPs@aptamer as catcher, a noncompetitive fluorescence sensing strategy was developed for determination of SMZ with good sensitivity, accuracy, selectivity, and stability. Under the optimized conditions, fluorescence increases linearly in the 0–20 ng/mL SMZ concentration range, and the detection limit is 0.014 ng/mL. The fluorescence sensing method was applied to analysis of water and fish muscle samples, and recoveries ranged from 81.78 to 119.46 % with relative standard deviations below 4.2 %. This study offered a reliable and sensitive fluorescence sensing strategy for SMZ determination in food samples, which owns great potential for wide-ranging application in harmful compounds assay by simply changing the type of aptamer and its complementary single-stranded DNA.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yawen Li,Xuefan Qiu,Chencan Li,Zhihan Sun,Wei Qiu,Ling Wang
The dynamic control of fluorescence intensity in a time-dependent manner is crucial for enhancing the complexity of dynamic information encryption. In this study, we introduce a new system that combines a pH-responsive microgel with a non-equilibrium Eu-containing polyoxometalate. This system is created through dissipative self-assembly based on urease, enabling precise regulation of fluorescence intensity on a time scale. This intelligent fluorescent system exhibits potential applications in fluorescent ink, enzymatic logic gate and information encryption. Moreover, by simply manipulating the concentration of urease, the lifetime of encoded information can be accurately regulated. These time-encoding characteristics endow Eu-containing polyoxometalate with significant potential for advanced information encryption and data storage.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Juan Hao,Fenfen Liu,Nan Liu,Mulang Zeng,Yonghai Song,Li Wang
Here, a novel fluorescent carbon dots (CDs)@Eu-2, 6-pyridinedicarboxylic acid (DPA) metal organic frameworks (MOFs) was synthesized by encapsulating CDs into the Eu-DPA MOFs for the detection of Cu 2+ . The as-prepared CDs@Eu-DPA MOFs fluorescent probe was investigated by transmission electron microscopy, Fourier transform-infrared spectroscopy and fluorescence spectroscopy. The results showed the CDs@Eu-DPA MOFs exhibited the uniform ball-flower-like nanostructures and were very stable in aqueous solution due to their nanoscaled size and the ball-flower-like nanostructures. The CDs@Eu-DPA MOFs could emit two kinds of fluorescence which originated from CDs and Eu-DPA MOFs, respectively under a single wavelength excitation at 275 nm. In the presence of Cu 2+ , the fluorescence of Eu-DPA MOFs decreased and the fluorescence of CDs kept constant to result in ratiometric fluorescent response toward Cu 2+ when they were used as the recognition parts and the reference, respectively. The obtained CDs@Eu-DPA MOFs for the detection of Cu 2+ showed a wide linear range (50 nM–10 μM) and a low detection limit (26.3 nM) with high sensitivity, stability and selectivity. The work provides a good method to construct fluorescent sensors based on MOFs.
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SENSORS
·
2024
·Vol. 24
·期 13
·4142
·
IF 3.4
Ling Zhang,Chu Chen,Hongyan Zhang
TiO2is a typical semiconductor material, and it has attracted much attention in the field of humidity sensors. Doping is an efficient way to enhance the humidity response of TiO2. Eu-doped TiO2material was investigated in both theoretical simulations and experiments. In a simulation based on density functional theory, a doped Eu atom can increase the performance of humidity sensors by producing more oxygen vacancies than undoped TiO2. In these experiments, Eu-doped TiO2nanorods were prepared by hydrothermal synthesis, and the results also confirm the theoretical prediction. When the doping mole ratio is 5 mol%, the response of the humidity sensor reaches 23,997.0, the wet hysteresis is 2.3% and the response/recovery time is 3/13.1 s. This study not only improves the basis for preparation of high-performance TiO2humidity sensors, but also fills the research gap on rare earth Eu-doped TiO2as a humidity-sensitive material.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fangfang Chen,Jiaming Wang,Wei Xu,Zhuangzhuang Ren,Guan Peng,Tao Huang,Fei Zhao
In this work, europium (III) complexes were synthesized by using different o-hydroxy-benzophenone ligands, namely 2-hydroxy-4-octyloxybenzophenone (HL 1 ), 4-allyloxy-2-hydroxybenzophenone (HL 2 ) and 2-hydroxy-4-methoxybenzophenone (HL 3 ). The structures and optical properties of the Eu III complexes E1, E2 and E3 were characterized by elemental analysis, infrared/fluorescence spectroscopy and mass spectrometry. The aggregation-induced emission properties from E1, E2 and E3 were systematically investigated in the acetone/water binary mixtures. At the same time, the corresponding agglomeration behavior and self-assembly structures in the Eu III complex system was confirmed through scanning electron microscopy. Excellent luminescent performance was illustrated in sample of E1 (the luminescence quantum yield of 21.36 % in solid state) which should be attributed to the aggregation-induced emission from better self-assembly behavior with longer carbon chain in ligand. The results of ultraviolet aging resistance from E1 reveal that the self-assembly behavior could not only improve the aggregation-induced emission performance, but also enhance the photostability of Eu III complex compared with the traditional β-diketone Eu III complex. This discovery may provide a facile strategy to design and prepare more promising rare earth complexes with good luminescence properties and strong photostability for application in solid state.
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Zhiqi Liang,Zhili Zhang,Liu Li,Wen Xu,Mingjun Tao,Decai Li
The magnetic-luminescent bifunctional nanospheres NH 2 –Fe 3 O 4 /HMDA[Eu(DBM) 4 ] were prepared by coating the amino-functionalized Fe 3 O 4 nanospheres with HMDA[Eu(DBM) 4 ]. The X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy of the bifunctional nanospheres were characterized. Molecular simulations of the adsorption configurations of the NH 2 –Fe 3 O 4 /HMDA[Eu(DBM) 4 ] were performed. The photoluminescence and magnetic properties of the nanospheres were investigated. Magnetic particle inspection utilizing NH 2 –Fe 3 O 4 /HMDA[Eu(DBM) 4 ] nanospheres was carried out to detect cracks on the coupling surface. The magnetic field at the defects of the component under the magnetic field was simulated and analyzed. Furthermore, simulations and analyses were performed to examine the magnetic field distribution at the cracks under an applied magnetic field. The magnetic-luminescent bifunctional nanospheres NH 2 –Fe 3 O 4 /HMDA[Eu(DBM) 4 ] show great promise for widespread application in magnetic particle inspection due to their high visibility under ultraviolet light and controllability in the presence of magnetic fields.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 9
·e70374
·
IF 0
Quanfeng Ye,Lingyi Li,Jie Zhang,Mingyu Teng,Fengshou Wu,Deman Han
Salen-type Schiff-base ligands (H 2 L) were synthesized through the condensation reaction between 1,2-diphenylethane-1,2-diamine and o-vanillin. Three novel luminescent Zn-Ln complexes, [ZnL] 2 Ln (Ln = Gd, Tb, Eu), were successfully prepared by reacting the zinc complex (ZnL) with LnCl 3 . Subsequent treatment of [ZnL] 2 Ln with dibenzoylmethane yielded three dinuclear derivatives, β-[ZnL]Ln (Ln = Gd, Tb, Eu). All complexes were comprehensively characterized by single-crystal X-ray diffraction and FT-IR spectroscopy. Structural analyses revealed that complexes 1–3 adopt trinuclear Zn-Ln-Zn architectures, whereas complexes 4–6 exhibit dinuclear Zn-Ln configurations. Solid-state photoluminescence measurements demonstrated quantum yields of 27.94% (ZnL), 0.90% ([ZnL] 2 Eu), 1.82% ([ZnL] 2 Tb), 1.05% ([ZnL] 2 Gd), 0.65% (β-[ZnL]Eu), 1.16% (β-[ZnL]Tb), and 0.70% (β-[ZnL]Gd), indicating their potential as advanced fluorescent rare-earth materials. The LED devices based on complexes β-[ZnL]Eu and β-[ZnL]Tb exhibit stronger emission intensities compared to those based on complexes [ZnL] 2 Eu and [ZnL] 2 Tb. The obtained complexes were fabricated in LED; the CIE chromaticity coordinates of complexes β-[ZnL]Eu and β-[ZnL]Tb are (0.344, 0.316) and (0.347, 0.323), respectively, which are very close to the standard white light coordinates (0.33, 0.33).
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Haiping Wang,Yujia Pei,Xueren Qian,Xianhui An
Metal-organic frameworks (MOFs) are emerging highly crystallized three-dimensional network complex formed by self-assembling metal ions and organic ligands. However, all MOFs are nanoscale and micro scale powder materials, which greatly impedes their further applications. In this study, a transparent Eu-MOF@TEMPO-oxidized cellulose nanofibrils (Eu-MOF@TOCNF) photoluminescence material for specifically detecting copper ions was fabricated via in-situ synthesis in hydroalcoholic medium. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, Fluorescence spectrometer and other equipment were applied to characterize functionalized TOCNF film samples, and the results confirmed the successful fabrication of the functionalized TOCNF film with stable fluorescence properties. The film performed a high selectivity toward copper ion in the presence of other interfering metal ions. The fluorescence intensity of the film decreased gradually with the increase of copper ion concentration, and I 0 / I -1 developed a good linear relationship with [Cu 2+ ], which made the film a promising material for detecting Cu 2+ in water body.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7863-7876
·
IF 4.682
Liu Shixin,Du Mingrun,Ge Yanfeng,Li Zepeng,Srivastava Gyaneshwar P.,Wang Jinhua,Wei Tong,Zou Yunling,Li Xiaodong,Li Yanchun,Wang Mingchao
High entropy oxides are novel materials with diverse compositions that have received significant interest for their mechanical and photocatalytic properties. In this study, we enhanced the mechanical and photocatalytic performance of solid state fabricated high entropy oxide (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Y 0.2 ) 2 Zr 2 O 7 through Eu doping. Samples doped with different Eu ion concentrations demonstrated good thermal stability under high temperature without phase transformation after sintering at 1500 °C. We performed high pressure X -ray diffraction measurements and found that bulk modulus and critical pressure were improved by approximately 30 GPa and 5 GPa, respectively. This significant compression difference confirmed that Eu doping enhanced structural stability under high pressure. (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Y 0.2 ) 1.98 Eu 0.02 Zr 2 O 7 demonstrated the best photocatalytic performance, with a kinetic constant about 1.5 times that of undoped samples. The appropriate doping concentration, smaller grain size and wider light absorption range contribute to the better photocatalytic performance irradiated under UV light. This work provides valuable insights for the design and improvement of high entropy oxide mechanical and photocatalytic performance. Graphical abstract
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