INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinzhe Zhou,Mingyu Yao,Zixuan Li,Mengjiao Li,Panlai Li,Wei Zhang,Huanrong Li
The ″cyan gap″ is the bottleneck of full-visible-spectrum white light-emitting diodes (WLEDs), and the development of high thermal stability blue–cyan phosphors plays a decisive role in compensating for the cyan gap. Herein, we report a blue–cyan-emitting celsian phosphor prepared using Ba2+-doped LTA/FAUX zeolite. Excited by UV light, celsian phosphors show a super broad emission at the blue–cyan range with a full width at half-maximum (fwhm) more than 100 nm, the broadband emission effectively eliminates the cyan gap and has excellent thermal quenching resistance (120% @ 25 °C). A full-visible-spectrum WLED device prepared using the phosphor exhibits a color rendering index as high as 93, exhibiting great advantages in WLEDs. These studies not only show great promise of celsian phosphor as a blue–cyan emitter but also open the way for the preparation of suitable phosphors in zeolite materials.
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Journal of Energy Storage
·
2023
·
IF 9.4
Yanmei Liang,Danhua Zhu,Shixing Chao,Meihua Hu,Danqin Li,Weiqiang Zhou,Jingkun Xu,Xuemin Duan,Peipei Liu
In term of supercapacitors application, MnO 2 has been recognized as a popular pseudocapacitive material on account of its environmental friendliness, cost inexpensive, plentiful abundance and high theoretical capacitance. However, its inherently low conductivity and structural instability lead to low specific capacitance and short cycle life, which greatly limit its development. Rare-earth doping can manipulate the size, shape, and crystallographic phase of doped nanomaterials . For the sake of hoisting the supercapacitors performance of MnO 2 , herein, we synthesized europium-doping MnO 2 (Eu 5% -MnO 2 ) ultrathin nanosheets (3.4 nm) possessing rich oxygen vacancies via a facile co-precipitation strategy. The specific capacitance of Eu 5% -MnO 2 at 1 A g − 1 is 361.2 F g − 1 and remains 100% after 10,000 cycles, outperforming of MnO 2 nanosheets (198 F g −1 , 82.8%). The reason of enhancing performance may be mainly correlation to the heighten conductivity, boosted surface reactivity and electrochemical active sites. The assembled Eu 5% -MnO 2 //AC device at 1 A g −1 can reach 63.36 F g −1 with high voltage of 3 V and exerts 19.8 Wh kg −1 of energy density when the power density is 373.2 W kg −1 . This synthesis technique is a simple and convenient means for the development of high-performance MnO 2 -based energy storage electrodes.
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Polymer Chemistry
·
2021
·Vol. 12
·期 29
·4159-4166
·
IF 5.582
Yicheng Wang,Yuxin Wang,Yaqin Hu,Wen Jing Yang,Lianhui Wang
The design of europium(III)-based (Eu(III)-based) nanomaterials with good water dispersity and high fluorescence is of great importance for their bioapplication. In this work, Eu(III)-containing nanohydrogels were fabricated by a facile reflux-precipitation polymerization and their potential as theranostic nanomaterials were explored. The resultant PAAEu nanohydrogels (NGs) exhibited excellent monodispersity, high aqueous stability and strong fluorescence intensity. They could be internalized by cancer cells and showed high fluorescence signals after 5 hours of incubation. The in vitro cell assays confirmed the good cytocompatibility of PAAEu NGs with a cell viability of above 90% after 12 hours. After loading with the anticancer drug doxorubicin (Dox), Dox@PAAEu NGs induced cell apoptosis and necrosis and exhibited high cytotoxicity towards cancer cells. The prepared Eu(III)-containing nanohydrogels could be employed as theranostic nanomaterials for bioimaging and drug delivery applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qingmeng Dong,Zhouqi Tian,Wulin Song,Weiping Deng,Hongxi Zhang
The heterogeneous catalyst for depolymerization of lignin has a good application prospect because the catalyst is easy to recover. Although heterogeneous noble metal catalysts exhibit excellent activity under mild conditions, high prices restrict their wide use. In recent reports, nano rare earth oxide catalysts have shown good performance in the catalytic oxidation of lignin, and their prices are relatively low, which has good research value. Our study found that rare earth oxide nanocatalysts have obvious structure-activity relationship in the catalytic oxidation of lignin. To investigate theses structure-dependent behaviour and the reaction mechanism, a series of shape-specific Eu 2 O 3 nanocrystal catalysts (spheres, spindles, sheets and rods) with well-defined crystal facets were synthesized and investigated. The four catalysts show increasing conversions from 54.6% to 91.2% in the sequence of nanospindles, nanospheres , nanosheets and nanorods , under condition of 1 MPa O 2 , 493 K and 8 h. These results demonstrate that the Eu 2 O 3 nanocrystal is structure-sensitive. It is found that the surface crystal facets of Eu 2 O 3 nanocrystals play crucial roles in the catalytic properties. Among the nanocrystals, Eu 2 O 3 nanorods with well-defined (220) crystal facets displayed superior catalytic activity. It is deduced that the high reactivity of Eu 2 O 3 nanorods is related to the abundant lattice oxygen which is benefit to active oxygen species. A plausible reaction pathway that involves the Mars-van Krevelen mechanism was proposed.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 71
·期 2
·313-323
·
IF 1.547
Gao Fei,Sheng Ye,Song Yanhua,Zheng Keyan,Lin Chunming,Zhang Hui,Huo Qisheng,Zou Haifeng
Photoluminescent nanomaterials had emerged as an amazing field in a wide range of applications during the past few decades. In this article, fibrous europium tartrates and photoluminescent silica nanotubes were conveniently synthesized by using sol–gel method, in which europium ions entered silica matrix. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, fourier transform infrared spectra, energy-dispersive X-ray spectroscopy and photoluminescence (PL) spectra analysis were used to characterize the growth, structure, morphology and optical property of the products. The results indicated that europium tartrates nanofibers as a template can transform tetraethylorthosilicate into silica nanotubes effectively. Meanwhile, europium(III) was transferred from the fibers to the tubes successfully. A hard template mechanism was proposed to explain the formation process of europium(III)-doped silica nanotubes. Moreover, different morphologies of silica-based nanomaterials were obtained due to varying NH 4 OH addition or stirring time. PL spectra from nanofiber and nanotube show a typical emission of europium(III), and 13 % is the quenching concentration of europium(III) in silica matrix for this system. The novel silica nanotubes can be applied potentially in optical and biological areas.
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Materials Science & Engineering C-Materials for Biological Applications
·
2014
·
IF 2.736
Shizhu Chen,Cuimiao Zhang,Guang Jia,Jianlei Duan,Shuxiang Wang,Jinchao Zhang
Lanthanide-doped sodium yttrium fluoride (NaYF 4 ) nanoparticles exhibit novel optical properties which make them be widely used in various fields. The extensive applications increase the chance of human exposure to these nanoparticles and thus raise deep concerns regarding their riskiness. In the present study, we have synthesized europium doped NaYF 4 (NaYF 4 :Eu 3 + ) nanoparticles with three diameters and used endothelial cells (ECs) as a cell model to explore the potential toxic effect. The cell viability, cytomembrane integrity, cellular uptake, intracellular localization, intracellular reactive oxygen species (ROS), mitochondrial membrane potential (MMP), apoptosis detection, caspase-3 activity and expression of inflammatory gene were studied. The results indicated that these nanoparticles could be uptaken into ECs and decrease the cell viability, induce the intracellular lactate dehydrogenase (LDH) release, increase the ROS level, and decrease the cell MMP in a size-dependent manner. Besides that, the cells were suffered to apoptosis with the caspase-3 activation, and the inflammation specific gene expressions (ICAM1 and VCAM1) were also increased. Our results suggest that the damage pathway may be related to the ROS generation and mitochondrial damage. The results provide novel evidence to elucidate their toxicity mechanisms and may be helpful for more rational applications of these compounds in the future.
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INTEGRATED FERROELECTRICS
·
2021
·
IF 0.836
Qinyi Li,Peisong Tang,Ruipeng Hou,Yifan Zhou,Haifen Chen
Using Eu2O3 as the source of europium, anhydrous ethanol as the solvent system, methylene benzoyl (DBM), 2-thiophenyl trifluoroacetone (TTA), 1-(4-tert-butylphenyl)-3 -(4-methoxyphenyl) −1,3-propanedione (Avobenzone) and 2,4,6-trimethylbenzoic acid (TMBA) as first ligands, triphenyl phosphine (TPPO) as second ligands, the four kinds complexes of europium(III) ternary rare earth have been successfully prepared by precipitation reaction. The samples were characterized by absolute quantum efficiency meter (DQE), fluorescence spectrum (FS), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry differential scanning calorimetry(TG-DSC). The influence of first ligand change on fluorescence intensity, fluorescence quantum efficiency, color temperature, color coordinate and thermal stability of complexes were analyzed from the perspective of energy transfer, so as to explore the influence of the first ligand on fluorescence performance of europium complexes. The results showed that the fluorescence of Eu(TTA)3TPPO was the strongest, while the fluorescence of Eu(TMBA)3(TPPO) was the weakest.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·2886
·
IF 5.076
Chao Bai,Shi He,Huai-Ming Hu,Hui Zeng,Feng Zou,Ji-Jiang Wang
A europium(III) hybrid material Eu(tta)3bpdc-SiO2@mTiO2(Htta = 2-thenoyltrifluoroacetone, H2bpdc = 2,2′-bipyridine-3,3′-dicarboxylic acid) was successfully designed and synthesized by the covalent grafting complex Eu(tta)3bpdc to SiO2@mTiO2core–shell nanosphere. The FT-IR, PXRD, XPS, TEM, HRTEM, SAED, TGA and PL were performed to characterize these materials. The results indicate that core–shell nanosphere structure and anatase crystallites of SiO2@mTiO2are retained well after grafting the europium complex. Hybrid material Eu(tta)3bpdc-SiO2@mTiO2displays uniform nanosphere structure, bright red color and long lifetime, which can serve as a multicolor emission material modulated by using Al3+ions via the cation exchange approach under a single-wavelength excitation. To the best of our knowledge, this work is the first multicolor emissive sensor for Al3+ions based on the lanthanide hybrid material.Keywords:lanthanide hybrid materials;SiO2@mTiO2core–shell nanosphere;bipyridine derivative;multicolor luminescence
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Solar RRL
·
2020
·Vol. 4
·期 11
·2000390
·
IF 7.527
Santhosh Kumar Karunakaran,Gowri Manohari Arumugam,Wentao Yang,Sijie Ge,Saqib Nawaz Khan,Yaohua Mai,Xianzhong Lin,Guowei Yang
All-inorganic perovskite of CsPbBr 3 thin-films solar cells has attracted increasing interest in recent years due to its potential long-term stability over the generally used hybrid perovskites. Herein, all-inorganic CsPbBr 3 perovskites are doped with Eu 2+ to enhance the efficiency of perovskite solar cells (PVSCs). The perovskite films exhibit a better crystallinity with smooth morphology after the introduction of rare-earth elements. Hence, the hole-transport layer-free device with presence of Eu 2+ and low-cost carbon electrode achieves both enhanced efficiency and stability. In particular, the power conversion efficiency (PCE) enhances from 5.66% to 7.28% with high V OC of 1.45 V by optimizing the doping concentration of Eu 2+ . In addition, the storage stability measurements reveal excellent performances of PCE without encapsulation in air with relative humidity of 70–80%. These results can pave changes in future inorganic PVSCs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhou Yang,Hongwei Niu,Laiyu Xia,Le Li,Meng Xiang,Chengbin Yu,Zhiqian Zhang,Shuang Dong
Electrocatalytic water splitting is regarded as the most efficient way of producing novel hydrogen energy , but is suffering from high overpotential and sluggish kinetics of oxygen evolution reaction (OER). Some organics including glycerol have been added to ameliorate the shortcomings of OER, but the selectivity of electrocatalysts is of great importance. Herein, a rare-earth metal Eu 3 O 4 /WO x heterojunction with nonstoichiometric O is designed and prepared, the Eu 3 O 4 /WO 2.72 stands out from the crowd for which shows the best electrocatalytic performances that the glycerol oxidation reaction (GOR) potential is only 1.33 V at 10 mA cm −2 . In addition, Eu 3 O 4 /WO 2.92 and Eu 3 O 4 /WO 2.72 show low overpotentials of 141 mV and 129 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) compared with the benchmark Pt/C electrocatalyst. Eu 3 O 4 /WO 2.72 heterojunction shows an ultralow cell voltage of 1.17 V in 1 M KOH with 0.1 M glycerol. Our study opens up a fashion-forward way for the designation of rare-earth metal heterojunction electrocatalysts in the biodiesel glycerol oxidation linking to hydrogen evolution.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·1219-1225
·
IF 1.186
Dai Ying,Cao Bin,Zhong Shimin,Xie Guanbao,Wang Youqun,Liu Yuhui,Zhang Zhibin,Liu Yunhai,Cao Xiaohong
Comparing with the traditionally immiscible two-phase extraction, the homogeneous liquid–liquid extraction technique shows potential in industrial separation engineering due to nearly infinite contact interface. In this work the ionic liquid (IL) compounds such as N -(carboxymethyl)- N , N -dimethylethanaminium bis-trifluoromethane-sulfonimide ([DHbet][Tf 2 N]) and N -(carboxyethyl)-trimethylammonium bistrifluoromethane-sulfonimide ([THbet][Tf 2 N]) were synthesized. The homogeneous extraction behaviors of europium with two ILs were studied as functions of solution pH, ionic strength, contact time, and initial europium concentration. The results indicated that both homogeneous extractions were dependent on pH and independent on ionic strength. The extraction capacities for [DHbet][Tf 2 N] and [THbet][Tf 2 N] were 3.29 mmol/L and 3.16 mmol/L, respectively. ILs could be recovered using 1.0 M hydrochloric acid. The mole-ratio method indicated the formation of a mononuclear complex between the europium ion and IL. Total europium extraction efficiencies of more than 91% for [DHbet][Tf 2 N] and more than 90% for [THbet][Tf 2 N] were obtained by quadruple-stage countercurrent extraction. The result proves the feasibility of the homogeneous liquid–liquid extraction technique as an alternative option for europium separation from aquatic solution.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Gao Jie,Li Qian,Wang Caihong,Tan Hongliang
A ratiometric fluorescent probe is described that is based on a functionalized europium(III) coordination polymer (Eu/DPA-TA). It can be fabricated by using dipicolinic acid (DPA) as a bridging ligand (to sensitize the Eu 3+ fluorescence) and terephthalic acid (TA) acting as a functional ligand to recognize the hydroxy radical ( • OH). The quenching of Eu 3+ fluorescence (measured at excitation/emission wavelengths of 288/615 nm) by water is strongly reduced in the presence of TA. This leads to a significant enhancement in the emission lifetime and intensity of Eu 3+ . Upon the addition of • OH, the fluorescence of Eu/DPA-TA showed ratiometric changes in that the TA sensitized fluorescence (peaking at 445 nm) is switched on, while the plain Eu 3+ fluorescence (peaking at 615 nm) decreases. This finding led to a method for the ratiometric (2-wavelength) detection of OH˙ with a 0.5 μM detection limit. The method also allows OH˙ to be detected with bare eyes at OH˙ concentrations as low as 10 μM. In our perception, this study paves the way towards the design of new functionalized lanthanide coordination polymers for fluorometric assays and biomedical imaging.
Schematic of a ratiometric fluorescent assay for the detection of hydroxy radical ( • OH) based on the use of a europium(III)/dipicolinic acid coordination polymer (Eu/DPA CP) functionalized with terephthalic acid (TA). A gradual color change from red to blue can be observed and correlated to • OH concentrations.
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