MRS Communications
·
2018
·Vol. 8
·期 3
·1224-1229
·
IF 3.008
Junlan Guo,Jianguo Tang,Jing Wang,Sui Mao,Haidong Li,Yao Wang,Jin Liu,Jing Wang,Yanxin Wang,Linjun Huang,Matt J. Kipper,Laurence A. Belfiore
This paper presents new water-soluble bio-polyelectrolyte-based nanoparticles, formed from lanthanide-induced polysaccharide aggregates (LIPAs). These new nano-aggregates are formed by coordinating a photoluminescent lanthanide–ligand complex to a single polyelectrolyte [i.e. polyanionic hyaluronic acid (HA)] or to two oppositely charged polyelectrolytes [i.e. HA and polycationic chitosan (CHI)]. We demonstrate that photoluminescent Eu3+–ligand complexes, which are dispersed homogeneously in aqueous solution by the association with water-soluble HA. The polysaccharide supermolecular assembly can be tuned to obtain nanoparticles of different sizes and surface charges. The preparation of stable and water-soluble lanthanide complexes via Eu3+–LIPAs opens opportunities for use of luminescent lanthanides in aqueous environments, for biosensing and bioimaging applications.
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高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Zhuwei Gu,Ke Xing,Sheng Cao,Bingsuo Zou,Jialong Zhao
ABSTRACT Mn 2+ doped CsPbCl 3 (Mn 2+ :CsPbCl 3 ) nanocrystals (NCs) have attracted considerable attention due to their unique strong and broad orange-red emission band, presenting promising applications in the field of photoelectric devices. However, pristine Mn 2+ :CsPbCl 3 NCs commonly suffer from low photoluminescence quantum yield (PL QY) and stability issues. Herein, we introduced europium ions (Eu 3+ ) into Mn 2+ :CsPbCl 3 NCs via the thermal injection synthesis method to obtain high performance Eu 3+ and Mn 2+ codoped CsPbCl 3 (Eu 3+ /Mn 2+ :CsPbCl 3 ) NCs. The maximum PL QY of the resulting Eu 3+ /Mn 2+ :CsPbCl 3 NCs reaches up to 90.92%. It is found that the doping of Eu 3+ ions significantly reduces the non-radiative recombination caused by high defect states, and improves the energy transfer efficiency from exciton to Mn 2+ , thereby boosting the PL performance. Moreover, doping Eu 3+ ions notably improves the UV-light and water stability of Mn 2+ :CsPbCl 3 NCs. We further demonstrate the application versatility of Eu 3+ /Mn 2+ :CsPbCl 3 NCs in white light emitting diodes (WLEDs) and optical anti-counterfeiting applications. This work provides a valuable perspective for the attainment of high performance Mn 2+ :CsPbCl 3 NCs and lays a foundation for the codoping of other lanthanide ions to adjust the luminescence properties of Mn 2+ :CsPbCl 3 NCs.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 9
·2605-2613
·
IF 4.831
Liu Yanting,Zhou Shixin,Fan Louzhen,Fan Hong
We have prepared graphene quantum dot-europium(III) complex composites by noncovalently connecting chelating ligands dibenzoylmethane (DBM) and 1,10-phenanthroline (Phen) with graphene quantum dots (GQDs) first, followed by coordination to Eu(III). The resulting composites are well water-soluble and display red fluorescence of high color purity. The composites were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Aqueous solutions of the composites under 365 nm excitation display fluorescence with a peak at 613 nm and a quantum yield as high as 15.5 %. The good water solubility and stable photoluminescence make the composites very different from other Eu(III)-based coordination complexes. The composites are cell viable and can be used to label both the cell membrane and the cytoplasm of MCF-7 cells. They are also shown to act as bioprobes for in-vivo localization of tumorous tissue. In our perception, such composites are expected to possess wide scope because of the many functionalizations that are possible with GQDs.
Synthesis of red fluorescent graphene quantum dot-europium complex composites for use in bioimaging.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2014
·Vol. 301
·期 1
·257-262
·
IF 1.415
Zha Zhongyong,Wang Dingna,Hong Wei,Liu Li,Zhou Sai,Feng Xiaojie,Qin Bing,Wang Jianmei,Yang Yi,Du Liang,Zhang Dong,Fang Zhendong,Xia Chuanqin
This study aimed at influence of europium speciation on its accumulation in Brassica napus (CK) and over-expressing BnTR1 lines (OE), and the kinetics of Eu uptake were investigated. These results indicated that the uptake in the roots of OE was higher than that of CK at high concentrations of europium and even the enrichment in the roots of OE was as high as 20,000 mg/kg at 328.9 μΜ Eu, this suggested that OE might have better resistance to uranium than CK. The time kinetics in plants showed that there had the similar trend between CK and OE. The formation of Eu 3+ at pH 5 in deionized water was beneficial to plants enrichment Eu and carbonate could reduce the adsorption of Eu in two group and phosphate almost completely impress the adsorption of Eu in two group, but citric acid could enhance europium root-to-shoot translocation in two group. These results would help understanding the mechanism of Eu uptake in Brassica napus (CK) and over-expressing BnTR1 lines (OE), therefore properly developing efficient europium/americium phytoremediation.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2016
·Vol. 2017
·期 3
·651-658
·
IF 2.686
Dongping Su,Ying Liu,Shimeng Li,Songdong Ding,Yongdong Jin,Zhipeng Wang,Xiaoyang Hu,Lirong Zhang
Graphical The steric effects of the branched chains of a series of alkyl-substituted pyridylpyrazole ligands on the extraction of Am III and Eu III ions were investigated in HNO 3 medium. These ligands exhibit good selective extraction abilities for Am III ions, and the steric effects of the branched chain have a significant impact on the distribution ratios ( D Am and D Eu ) and the separation factor (SF Am/Eu ). To clarify the structure–property relationships of pyridylpyrazole ligands and provide guidance for the design of new and more efficient ligands for the selective extraction of actinides over lanthanides, a series of alkyl-substituted pyridylpyrazole ligands with different branched chains at different positions of the pyrazole ring were synthesized. Extraction experiments showed that the pyridylpyrazole ligands exhibited good selective extraction abilities for Am III ions, and the steric effects of the branched chain had a significant impact on the distribution ratios of Am III and Eu III ions as well as the separation factor. Moreover, both slope analyses and UV/Vis spectrometry titrations indicated the formation of a 1:1 complex of 2-(1-octyl-1 H -pyrazol-3-yl)pyridine (C8-PypzH) with Eu III ions. The stability constant (log K ) for this complex obtained from the UV/Vis titration was 4.45 ± 0.04. Single crystals of the complexes of 3-(2-pyridyl)pyrazole (PypzH) with Eu(NO 3 ) 3 and Sm(NO 3 ) 3 were obtained; PypzH acts as a bidentate ligand in the crystal structures, and the N atom with a bound H atom did not participate in the coordination. In general, this study revealed some interesting findings on the effects of the alkyl-chain structure and the special complexation between pyridylpyrazole ligands and Ln III ions.
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JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Ruixiang Wu,Fengjie Guo,Zixuan Wang,Jiayu Di,Cheng Li,Ruiling Zhang,Peigeng Han,Yujing Wang,Xilin Bai,Junfeng Zhang,Xiangyang Miao
Owing to their unique optical properties and nontoxicity, lead-free halide double perovskite nanocrystals are of interest for widespread applications. Herein, the colloid synthesis and photoluminescence property of Ag + -Eu 3+ codoped Cs 2 NaInCl 6 nanocrystals were investigated. The perovskite nanocrystals exhibit a broad warm-white photoluminescence with correlated color temperature (CCT) of 3447 K and color rendering index (CRI) of 90.2, and the means of codoping would improve its optical performance. A fast energy transfer and a long-lived self-trapped excitons state are unveiled by the femtosecond transient absorption spectra. The fast energy transfer from the self-trapped excitons of host nanocrystals to the Eu 3+ ions is helpful to achieve a broad photoluminescence, and the quantum yield of Cs 2 NaInCl 6 :0.05Ag + -Eu 3+ nanocrystals can be enhanced to 69.5%. There is a large exciton binding energy and strong electron-phonon interaction in the codoped perovskite nanocrystals. The efficient and excellent air-stable double perovskite nanocrystals would be considered as a single-component phosphor for warm-white lighting.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 5
·1-11
·
IF 2.325
Zhu Wei,Liang Shuang,Wang Jing,Yang Zhe,Zhang Li,Yuan Tianmeng,Xu Zushun,Xu Haibo,Li Penghui
Abstract Multifunctional nanocomposites based on BaGdF 5 nanoparticles (NPs) and metal phenolic network (MPN) have been engineered as novel contrast agents for potential applications in X-ray computed tomography, magnetic resonance and luminescence imaging. The BaGdF 5 @MPN nanocomposites were synthesized at room temperature by coating BaGdF 5 NPs with europium-phenolic network, which was obtained by the coordination of europium (III) with tannic acid (TA). The in vitro cytotoxicity assays against HepG2 cells revealed that the BaGdF 5 @MPN nanocomposites presented better cytocompatibility and lower cytotoxity than pure BaGdF 5 NPs. In addition, vivid red and green luminescence can be observed by confocal laser scanning microscope (CLSM) from the BaGdF 5 @MPN nanocomposites laden HepG2 cells under the excitation of UV (390 nm) and visible light (440 nm), respectively. The longitudinal relaxivity value (r 1 ) of the nanocomposites was 2.457 mM −1 s −1 . Moreover, the nanocomoposites exhibited X-ray computed tomography (CT) and T 1 -weighted magnetic resonance (MR) imaging capacities, and the intensities of the enhanced signals of in vitro CT and MR images were proportional to the concentrations of the nanocomposites. These results indicated that the as-prepared BaGdF 5 @MPN nanocomposites are promising contrast agents for CT/MR/luminescence imaging. Graphical Abstract
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PubMed
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Chao Bai,Lei Yan,Huai-Ming Hu,Feng Zou,Tian-Hua Zhang,Ganglin Xue
A ternary europium(III) coordination polymer, namely, [Eu(ctpy)(tta)2]n (1) (Hctpy = 4′-carboxy-2,2′:6′,2″-terpyridine and Htta = 2-thenoyltrifluoroacetone), was obtained and exhibits a 1D chain structure. 1-Eu emits intense red light, which can act as a luminescent dopant to be immobilized into polymers to prepare nanofiber films by an electrospinning technique. Subsequently, ternary europium-chain@polymer nanofiber films (1-Eu@PAN and 1-Eu@PMMA, PAN = polyacrylonitrile, PMMA = poly(methyl methacrylate)) as functional films have been successfully fabricated. These nanofiber films possess excellent mechanical strength and photo-/thermal stability, as well as emit luminous red light. The luminescent investigation indicates that the maximum intensity of the 5D0 → 7F2 transition of EuIII ion occurs in 1-Eu@PAN and 1-Eu@PMMA nanofiber films with 10 wt % 1-Eu loading. In addition, 10% 1-Eu@PAN nanofiber film can be used as a recyclable sensor for detecting Fe3+ ion in aqueous solution because 10% 1-Eu@PAN nanofiber film have good recyclability and selectivity. Electrospinning technique is an effective strategy to fabricate lanthanide coordination polymer-encapsulated polymer fiber films and to contribute to develop sensors.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yajuan Li,Dongyan Xie,Xuelei Pang,Xudong Yu,Tao Yu,Xiaoting Ge
A novel silylated ligand (L–Si) derived from a derivative of phenanthroline (2-(2-hydroxyphenyl)-imidazo[4,5-f]-1,10-phenanthroline, denoted as L) was designed, and it played key roles in the assembly of new organic-inorganic mesoporous hybrid functional material. Firstly, the two N atoms of pyridine rings can coordinate to europium ions and sensitize its luminescence. Secondly, the NH of imidzole ring could form hydrogen bonds with fluoride anions. Thirdly, the silylated group can covalently bonded to the frame of SBA-15 mesoporous silica via in-situ synthesis approach. In addition, 2-thenoyltrifluoroacetonate (TTA) was selected as the second ligand for the purpose of better luminescence. Finally, the europium luminescent mesoporous hybrid material Eu(L–S15) 2 TTA was obtained through the coordination reaction between europium ion and L–S15 as well as the second ligand TTA. Eu(L–S15) 2 TTA not only exhibits excellent luminescent properties and high thermal stability, but also retains the ordered mesoporous structures. More importantly, it displays a high-sensitivity sensing function with respect to fluoride ion. The limit of detection for the fluoride ion is as low as 1.6 × 10 −9 M for the fluoride ion.
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高影响因子
TALANTA
·
2019
·
IF 4.916
Long Yu,Hongxia Chen,Ji Yue,Xinfeng Chen,Mingtai Sun,Jing Hou,Khalid A. Alamry,Hadi M. Marwani,Xiangke Wang,Suhua Wang
Metal-organic framework is an extended coordination compound with repeating coordination entities and voids, which shows potential applications in gas storage, separation, catalysis, and etc. This work reports the synthesis of a new functional metal-organic framework of pyromellitic acid and europium , and its application in fluorescence sensing of doxycycline , a broad-spectrum polyketide antibiotic on the basis of fluorescence turn-on method. The metal-organic framework was initially non-fluorescent, however, with the addition of doxycycline, the system exhibited significant fluorescence enhancement at 526 nm and 617 nm, where both fluorescence intensities showed good linear correlations with the doxycycline concentration, suggesting the possibility for direct two-channel detection without any sensitization materials such as metal particles or surface-modified quantum dots . More interestingly, the unique fluorescence response of the system could discriminate doxycycline from other tetracycline antibiotics with high selectivity, and a limit of detection (LOD) was estimated to be 47 nM. It has been further demonstrated that the material has been successfully applied as sensing materials for selective determination of doxycycline in real samples of fish and urine.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13328-13335
·
IF 7.059
Jiaqiang Liu,Xizhuang Yue,Zhuopeng Wang,Xia Zhang,Yan Xu
Developing a highly reliable non-contact optical thermometer probe with excellent sensitivity and multi-mode temperature sensing behaviours is always a great challenge. Here, dual-emitting luminescent composites fabricated using a europium-based metal–organic framework (Eu-MOF) and surface-immobilized molecular dye (Coumarin 7) were successfully prepared by a simple solvothermal method, followed by a post-modification strategy. Benefiting from the linear response in fluorescence intensity ratios (FIRs) of Eu3+ to Coumarin 7 dye molecules in the temperature range from 10 °C to 90 °C, the composite demonstrated the maximum relative temperature sensitivity (Sr) of 0.50% °C−1 at 90 °C. Moreover, the observed red-shift of Coumarin 7 emission with the temperature readout suggests a dual-mode optical thermal sensing mechanism in the dye-immobilized MOF composite. Their excellent reusability and temperature sensing mechanisms have been also investigated. These results demonstrate the potential of the Coumarin 7 functionalized Eu-MOF composite as a dual-mode optical thermometer for temperature sensing applications.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Lihong Bao,Xiaojian Pan,Hongyan Zhang,Jun Wang,Yanchun Yang,Kefu Chao,Ojiyed Tegus
A novel alkaline earth niobates red phosphor CaNb 2 O 6 :Eu 3+ have been prepared through solid-state reaction, using the nanocrystalline EuB 6 as a novel activator. The Rietveld refinement of XRD results reveal that the Eu 3+ ions substitute the lattice site of Ca 2+ ions and the B 2− ions replace the lattice site of O 2− ions, which induces the defect energy levels at the band gap of 5 D n levels and leads to higher luminescence intensity of five times higher than using the Eu 2 O 3 activator. The CIE chromaticity coordinates of Ca 0·88 Nb 2 O 6 :0.12EuB 6 phosphor were calculated to be (0.643, 0.34) and it is quite similar to that of pure red light. Moreover, this phosphor exhibits an excellent luminescence thermal stability. When the ambient temperature rises to 398 K (125 °C) and 423 K (150 °C), the integrated emission intensity remains 90% and 86% of their initial PL intensity at 300 K, respectively. Based on above mentioned, the Ca 1-x Nb 2 O 6 :xEuB 6 as a NUV-excited red phosphor have a potential application for the high-performance white LEDs.
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