NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9211-9222
·
IF 3.277
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors have been synthesized via a one-step hydrothermal route using glycine (Gly) as a surfactant. The phosphors were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and luminescence decays. It was found that various surfactants had a profound influence on the crystal phase, morphology and emission intensity of the final products. Furthermore, the photoluminescence of Ln3+-doped Sc2Mo3O12 phosphors (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) was studied in detail. The energy transfer of MoO42− → Tb3+ (Dy3+) → Eu3+ and multicolor tunable emission occurred by changing the ratio of Tb3+/Eu3+ or Dy3+/Eu3+ under single wavelength excitation. Moreover, the energy transfer mechanism from Tb3+ (Dy3+) to Eu3+ was ascribed to dipole–dipole interactions and the energy transfer efficiency from Tb3+ to Eu3+ (95.3%) was higher than that from Dy3+ to Eu3+ (87.5%). Their tunable multicolor luminescence properties make Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors suitable for many potential applications in the fields of color displays and fluorescent lamps.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 3
·1107-1116
·
IF 3.288
Yan Qiao,Yilian Li,Wenxian Li,Jinrong Bao,Yushan Zheng,Lina Feng,Yangyang Ma,Kuisuo Yang,Anping Wu,He Bai,Yunjiang Yang
In this paper, novel core–shell (CS) structure composites SiO2@ANA-Si–Eu and SiO2@ANA-Si–Eu–L (L = phen, TTA) were prepared by the condensation of 5-N-bis(amidopropyltriethoxysilyl) nicotinic acid (HOOCC5H4NN(CONH(CH2)3Si(OCH2CH3)3)2, abbreviated as ANA-Si) and a SiO2 microsphere with a diameter of 200 nm in the absence of surfactants. The as-synthesized CS structure composites possess good dispersion, uniform size and excellent luminescence properties. Furthermore, silica modified core–shell–shell (CSS) structure composites SiO2@ANA-Si–Eu@SiO2 and SiO2@ANA-Si–Eu–L@SiO2 were successfully prepared by a sol–gel method using CS structure composites as the core and amorphous silica as the shell. Compared with the CS structure composites, CSS structure composites exhibited a stronger luminescence intensity in the solid state. Furthermore, an improved luminescence stability property of the CSS structure composites was found in aqueous medium. CSS structure composites exhibited improved luminescence, high stability and good solubility, which provided potential for their wide use in advanced phosphors, molecular biomarkers and luminescent tracers.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 14
·11174-11183
·
IF 2.779
Cui Zheng,Deng Guowei,Xu Pan,Liu Xiaoyang,Yang Min,Wang Qiliang
In this work, doped and co-doped LaNbO 4 :RE 3+ (RE = Eu, Eu/Tb, Tb) single crystals were prepared by a unique hydrothermal method under the condition of supercritical water and a wide temperature range (823–923 K). The crystal structure of LaNbO 4 :Eu 3+ /Tb 3+ were refined by virtue of the Rietveld method, which can determine the occupation position of dopants. The luminescence properties of Eu 3+ /Tb 3+ -doped LaNbO 4 phosphors were carefully measured and analyzed by diffuse reflectance spectra and ultraviolet. The energy transfer was recognized between host and doped Eu 3+ /Tb 3+ ions based on the luminescence spectra and decay lifetimes, which is dominated by electric multipolar interaction. The results show that the strong emission peaks at 491 nm ( 5 D 4 – 7 F 6 ), 550 nm ( 5 D 4 – 7 F 5 ), 590 nm ( 5 D 4 – 7 F 4 ), 623 nm ( 5 D 4 – 7 F 3 ) can be observed at the optimum reaction temperature of 650 °C, corresponding to CIE coordinates (0.3398, 0.3288). By adjusting the concentration of Eu 3+ /Tb 3+ ions, the emission colors of LaNbO 4 :Eu 3+ /Tb 3+ are varied from blue to pink and to white. Consequently, the synthesis strategy reported herein not only holds extensive promise for expanding the preparation techniques of materials with good luminescence properties but also promotes the practical applications of LaNbO 4 single crystal in low color temperature and high index white light-emitting diode (WLED).
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 16
·6435-6443
·
IF 8.067
Xu Sang,Qingru Wang,Xiaoli Gao,Adnan Khan,Ziyu Chen,Jiaxin Yang,Ming Feng,Lisa Liu,Feng Song,Wei Huang
Based on the interaction between Eu(III) complexes and liquid crystals (LCs), three general approaches by using energy transfer, electric field controllable orientation of LCs and the multi-wavelength excitation are presented to obtain a tunable emitting color for rare earth (RE)/LC composites. The Eu(tta)3phen/E7 composites were prepared via a simple guest–host method. The interaction between the RE complexes and LCs is analyzed for the emitting color change of the composites. The E7 host not only facilitates the ultraviolet photon harvesting and subsequent energy transfer to Eu(tta)3phen, but also serves the regulation of the distortion of the symmetry around the Eu3+ ions. Experimental and Judd–Ofelt theoretic analysis of the Eu(tta)3phen/E7 composites indicates the improvement of the luminescence for Eu(tta)3phen in the anisotropic LC host. This modulation of emitting color for RE/LC composites may open the door to broaden the applications of RE ion doped materials.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Zhenning Yu,Lei Zou,Yanli Chen,Jianzhuang Jiang
A facile approach was developed for preparing the multilayer hybrid films of mixed (phthalocyaninato) (porphyrinato) europium(III) triple-decker compound (Pc)Eu(Pc)Eu[trans-T(COOCH3)2PP] (1) and graphene oxide (GO) using the solution-processing QLS method. The combination of the nature of relatively high conductivity and great surface area for GO with the electroactive and semiconductive triple-decker compound in ITO electrode renders the hybrid film excellent sensing property for H2O2, due to the optimized triple-decker molecular packing in the uniform-sized nanoparticles (ca. 70 nm) formed on the GO surface. The amperometric responses are linearly proportional to the concentration of H2O2 in the range of 0.05–1800 μM with a fast response time of 0.03 s μM–1, a low detection limit of 0.017 μM, and good sensitivity of 7.4 μA mM–1. The present work represents the best result of tetrapyrrole-based nonenzymatic electrochemical sensor for H2O2. Nevertheless, the triple-decker/GO/ITO also shows excellent stability, reproducibility, and selectivity, indicating the great potential of electroactive tetrapyrrole rare earth sandwich compounds in combination with GO in the field of nonenzymatic electrochemical sensors.
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PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 5
·1462
·
IF 4.412
Hao Xu,Jie Zhu,Xiong Wang,Chao Shen,Shengshen Meng,Kai Zheng,Chao Lei,Longfeng Zhu
Developing sustainable routes for the synthesis of zeolites is still a vital and challenging task in zeolite scientific community. One of the typical examples is sustainable synthesis of aluminosilicate EU-1 zeolite, which is not very efficient and environmental-unfriendly under hydrothermal condition due to the use of a large amount of water as solvent. Herein, we report a sustainable synthesis route for aluminosilicate EU-1 zeolite without the use of solvent for the first time. The physicochemical properties of the obtained EU-1 zeolite are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential thermal analysis (TG-DTA), N2sorption, inductively coupled plasma (ICP) analysis, and solid nuclear magnetic resonance (NMR), which show the product has high crystallinity, uniform morphology, large BET surface area, and four-coordinated aluminum species. Moreover, the impact of synthesis conditions is investigated in detail. The sustainable synthesis of aluminosilicate EU-1 zeolite under solvent-freeKeywords:zeolite;aluminosilicate EU-1;sustainable route;solvent-free
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Wenfei Zhang,Qulan Zhou,Na Li,Mingtao Li
The synthesis of photocatalysts with good activity and strong product selectivity is of strategic importance for photocatalytic reduction of carbon dioxide (CO 2 ). In this study, an improved sol-gel method was employed for the synthesis of N-doped TiO 2 , Eu-doped TiO 2 , and N, Eu co-doped TiO 2 photocatalysts. The phase structures, optical and electrical properties of the catalysts were thoroughly investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller Surface area analysis, Ultraviolet-visible diffuse reflectance spectroscopy, Photoluminescence spectroscopy, and electrochemical measurements. The experimental results of photocatalytic CO 2 reduction indicated that both N and Eu doping could effectively improve the photoresponse of TiO 2 , but the synergistic effect of N and Eu made the N, Eu co-doped TiO 2 exhibit superior photocatalytic activity and product selectivity, the formation rate of methane (CH 4 ) by photocatalytic reduction of CO 2 using N-Eu/TiO 2 as the catalyst could reach 13.48 μmol·g cat −1 ·h −1 , which was about 12 times higher than that of pure TiO 2 , and the selectivity reached nearly 100%. Finally, this synergistic effect was explained using DFT calculation and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the possible mechanism of photocatalytic CO 2 reduction over N-Eu/TiO 2 was elucidated.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Junming Zhou,Hongmei Liu,Dong Liu,Peng Yuan,Hongling Bu,Peixin Du,Wenxiao Fan,Mengyuan Li
Weathered crust elution-deposited rare earth (WED-RE) ores are important rare earth element (REE) resources around the world. In these ores, the REE are believed to mainly exist as exchangeable REE(III) ions on the surfaces of clay minerals, such as tubular halloysite and platy kaolinite . However, the mechanisms underlying the sorption and desorption of REE(III) ions on clay minerals in the environment of weathered crusts remain ambiguous. In this study, the sorption/desorption characteristics of Eu(III) ions onto halloysite and kaolinite were investigated. The results revealed that Eu(III) was adsorbed onto both clay minerals through inner-sphere complexation and outer-sphere complexation, where the former was the primary sorption mechanism. Halloysite displayed a higher sorption capacity for Eu(III) than kaolinite in a weakly acidic environment (pH 4–6). The desorption efficiency increased with the increasing concentration of NH 4 + ions. When the NH 4 + concentration was 0.002 mol/L, which is similar to the typical cation concentration of groundwater/rainwater, the amount and rate of Eu(III) desorption from halloysite were lower than those from kaolinite. The desorption of Eu(III) ions from the two clay minerals is proposed to be governed by the attraction between the outer-sphere complexes and clay minerals when the NH 4 + concentration is 0.002 mol/L. Therefore, halloysite has a higher sorption capacity and stronger retention capacity for Eu(III) than kaolinite, which suggests that halloysite may play a greater role in REE(III) enrichment in WED-RE ores than kaolinite owing to the similar chemical properties of REE(III) ions. The fundamental results obtained in this study afford new insights into the migration of REE and the role of clay minerals in REE enrichment during ore formation.
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LUMINESCENCE
·
2015
·Vol. 31
·期 1
·190-194
·
IF 1.518
Guangya Jin,Zhijian Liu,Hongfa Sun,Zhiyong Tian
A lanthanide metal coordination polymer [Eu 2 (BDC) 3 (DMSO)(H 2 O)] was synthesized by the reaction of europium oxide with benzene-1,3-dicarboxylic acid (H 2 BDC) in a mixed solution of dimethyl sulfoxide (DMSO) and water under hydrothermal conditions. The crystal structure of Eu 2 (BDC) 3 (DMSO)(H 2 O) was characterized by X-ray diffraction (XRD). Thermo-gravimetric analysis of Eu 2 (BDC) 3 (DMSO)(H 2 O) indicated that coordinated DMSO and H 2 O molecules could be removed to create Eu 2 (BDC) 3 (DMSO)(H 2 O)-py with permanent microporosity, which was also verified by powder XRD (PXRD) and elemental analysis. Both Eu 2 (BDC) 3 (DMSO)(H 2 O) and Eu 2 (BDC) 3 (DMSO)(H 2 O)-py showed mainly Eu-based luminescence and had characteristic emissions in the range 550–700 nm. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 24
·11452-11459
·
IF 7.233
Lijia Liu,Jitao Li,John A. McLeod
We report a series of Eu-substituted methylammonium lead tribromide quantum dots (MAPb1−xEuxBr3 QDs). The crystallinity of these QDs increases with increasing Eu content, while there is only a small change in the lattice constant, and the morphology of the MAPb1−xEuxBr3 QDs is unaffected by the Eu content. This demonstrates that Eu is a suitable element for substituting Pb while retaining the original crystal structure. We observe blue photoluminescence (PL) consistent with Eu2+, which, at high Eu content (x = 0.3), contributes luminescence intensity equal to the green PL of unsubstituted MAPbBr3 QDs. As Eu is a less toxic substitute for Pb, that also provides blue luminescence, MAPb1−xEuxBr3 QDs may prove to be a valuable optoelectronic material.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6832-6837
·
IF 2.195
Li Chunzhe
A series of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ and Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors were fabricated by a solid state reaction. The phase composition and luminescent properties of the fabricated phosphors were investigated. The XRD patterns show that Eu 2+ and Mn 2+ were doped into the Ca 3 La 6 (SiO 4 ) 6 host in the present experiment. The Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ phosphors show the emission band in blue region and the Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ phosphors exhibit the emission band in yellow region. The excitation band of Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ overlaps with the emission band of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ that means a possibility for the energy transfer process from Eu 2+ to Mn 2+ in the Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors. Tunable luminescence was obtained due to this energy transfer process and warm white light was emitted by Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.04Mn 2+ and Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.05Mn 2+ phosphors.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光学材料
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Haoran Zhou,Linwen Jiang,Xin Chen,Anhua Wu,Zhuo Tang,Hongbing Chen
The color-tunable GdCaAl 3 O 7 : RE 3+ (RE = Eu, Tb, Eu@Tb) phosphors were synthesized via an ultrafast sol-gel auto-combustion synthesis method. The X-ray diffraction patterns confirmed the forming of GdCaAl 3 O 7 tetragonal phase, and the scanning electron microscopy images indicated that the obtained products presented honeycomb-like structure due to the gas releasing during the auto-combustion process. The luminescent properties, concentration quenching mechanism, energy transfer mechanism, luminescent dynamics, thermal stability and product practicability of GdCaAl 3 O 7 : RE 3+ (RE = Tb, Eu, Eu@Tb) phosphors were investigated systematically. All the GdCaAl 3 O 7 : RE 3+ products presented the characteristic emission of doped RE 3+ . Using GdCaAl 3 O 7 : 50% Tb 3+ @3.0% Eu 3+ as yellow-emitting phosphors in combination with commercial BAM: Eu 2+ blue-emitting phosphors and a NUV chip can successfully package a warm white LED device with high color rendering index (CRI, 86.3) and low correlated color temperature (CCT, 3348 K) that was very suitable for near-ultraviolet light-triggered indoor illumination.
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