CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hang Liu,Chanyu Yang,Jinkai Zhang,Runkang Lv,Yihao Wen,Yuhong Zhang
In this paper, a series of Eu-doped ZnSnO 3 nanoblocks are prepared through one-step hydrothermal method. The structure and morphology of Eu-ZnSnO 3 nanoblocks are characterised using SEM,XRD, XPS and TEM tests. The gas-sensitive properties of Eu-ZnSnO 3 nanoblocks towards isopropanol are explored. Compared with pure ZnSnO 3 , the response of 4 % Eu-ZnSnO 3 sensor is enhanced nearly three times. The response recovery time was greatly improved by Eu doping, and the 4 % Eu-ZnSnO 3 sensor showed a recovery time of only 8/10s for 100 ppm isopropanol at 260 °C, which is a 2.9-fold reduction in recovery time. The catalytic effect of Eu and n-n heterojunction structure of Eu 2 O 3 -ZnSnO 3 all contribute to enhance the gas response. The results prove that the Eu-ZnSnO 3 nanoblocks have great potential for the detection of isopropanol.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Pengbo Zhu,Xiao Liu,Hao Ren,Yao Wang,Jun Li,Yan Zhang,Zhonglin Du,Qiao Wang,Soo Wohn Lee,Laurence A. Belfiore,Mikhail Artemyev,Jianguo Tang
Due to the quantum confinement effect, the quantum dots (QDs) behave distinguished photo-/electro-luminescence property. However, due to so small size with 3–5 nm diameter, their surface defects cause spectral limitation and luminescent instabilities, which inhibited the applications of QDs in key areas. It should be very interesting if rich luminescence spectra of lanthanides can be used to enhance the emission and to extend the spectra of sulfide-base QDs. However, the sulfur repellency of lanthanide ions (such as Eu 3+ ) is the negative factor. In this work, we incorporated lanthanide ions (Eu 3+ ) complexes into QDs to realize this. Diketone (i.e., acetylacetone (ACAC)) and phenanthroline (Phen) were chosen as the ligands of Eu 3+ (i.e., Eu) chlorides. The experimental data indicated that the incorporating Eu 3+ complexes into the ZnS-modified CIZS QDs resulted in double enhancement of the luminescent intensity, the blue-shift of emission wavelength from 637 to 575 nm, the PLQY increase from 55.94 % to 81.56 %. Simultaneously, the Zn 2+ in the shell, under the influence of the Eu 3+ , reacted with oxygen vacancies in the environment. XRD shows the characteristic peaks of ZnO, indicating the formation of ZnO QDs.
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KEY ENGINEERING MATERIALS
·
2016
·
IF 0
D.C. Huang,You Fu Zhou,Chao Quan,Wen Tao Xu
New luminescent oxynitridosilicates doped with Eu2+ and Ce3+ have been synthesized by solid state reaction method at 1450oC. The host has the general formula La1-ySr1-xSiO3N: (yCe3+, xEu2+), which presents greenish-yellow or orange photoluminescence under UV/blue excitation. Remarkable long wavelength emissions centered above 565 nm were observed for the Ce3+ activated oxynitridosilicates, with compositions LaSrSiO3N:0.02Ce3+, and LaSrSiO3N:(0.02Ce3+, 0.02Eu2+) for 598 nm due to a significant amount of energy transfer from Ce3+ ions to Eu2+ ions. By combining the title LaSrSiO3N:(Ce3+, Eu2+) phosphors with the 450 nm InGaN chip, a broad range of white light with correlated color temperatures of ~3500 K and color-rendering index of 92 can be generated, demonstrating their promising practical applicability to the warm-white light-emitting diodes.
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Nanomaterials
·
2022
·Vol. 12
·期 14
·2398
·
IF 5.719
Chunhui Song,Qifa Song,Ziyou Ding,Yingchao Han
In this study, we synthesized polyacrylic acid (PAA)-Ca (Eu) nanoclusters as a luminescence sensor of phosphate ion by a complex method, and we aimed to achieve the quantitative detection of PO43−based on the sensitivity of the charge transfer band of Eu3+to anionic ligand. The resulting PAA-Ca(Eu) nanoclusters showed a well-dispersed and a dot-like morphology, with an ultra-small diameter (the average size of 2.17 nm) under high resolution transmission electron microscopy(HRTEM) observation. A dynamic light scattering particle size analyzer (DLS) showed a hydrodynamic size of 2.39 nm. The (PAA)-Ca (Eu) nanoclusters as a luminescence sensor showed a significantly higher sensitivity for PO43−than other anions (CO32−, SiO32−, SO42−, SO32−, Br−, Cl−, F−). The luminescence intensity displayed a linear increase (y = 19.32x + 74.75, R2> 0.999) in a PO43concentration range (0–10 mM) with the concentration of PO43−increase, and the limit of detection was 0.023 mM. The results showed good recovery rates and low relative standard deviations. These (PAA)-Ca (Eu) nanoclusters are hopeful to become a luminescence sensor for quantitatively detecting PO43−.
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高影响因子
JOM
·
2023
·Vol. 75
·期 3
·859-871
·
IF 2.6
Xiong Sang,Liang Dong
Tungsten trioxide (WO 3 ) nanoparticles were prepared by the citric acid method, using ammonium paratungstate as the tungsten source, and doped with rare earth europium (Eu) under various pH values and Eu content. The microstructure, morphology, and luminescence properties of the prepared samples were characterized by XRD, SEM, and a fluorescence spectrometer. The results show that Eu 3+ doped WO 3 nanoparticles were successfully obtained by the citric acid method, the prepared nanoparticles were spherical and rhomboidal, and the average particle size of the prepared samples reached 56 nm. The excitation spectrum consisted of a series of linear excitation peaks in the range of 250–550 nm. The strongest excitation peak was located at 543 nm, which belongs to the 7 F 0 → 5 D 1 transition of Eu 3+ .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuang Cao,Zhuoyi Zhang,Yunshuo Wu,Yuxin Sun,Zhe Li,Yanxia Gao,Haiqiang Wang,Xuanhao Wu,Zhongbiao Wu
Nitrous oxide (N 2 O) is a potent greenhouse gas with high global warming potential. It is urgent to develop active and stabile catalysts for N 2 O direct catalytic decomposition (deN 2 O) in industrial exhaust gas. In this study, a series of Eu-doped NiO catalysts were synthesized by co-precipitation method. The catalyst with an Eu to Ni molar ratio of 0.04 showed the highest deN 2 O ability, reaching 100 % conversion at 400 °C without generating NO x by-products. The catalyst also displayed resilience against O 2 and NO impurity gases, maintaining structural stability and achieving complete transformation of N 2 O at 440 °C. Eu was uniformly dispersed in NiO in the form of Eu 2 O 3 , which not only regulated the particle size and specific surface area of NiO, but also changed the surface chemistry of NiO by inducing more Ni 2+ active sites and more mobile O β species. Eu-doping altered the decomposition mechanism of N 2 O from L-H to E-R mechanism, reducing the energy barrier of O 2 desorption, which was the rate-determining step. During the reaction, Eu 0.04 Ni showed an activation behavior after cyclic use and long-term reaction and reduced T 100 to 320 °C after 14-hr experiment. These findings demonstrate the potential of the catalyst for practical application and provide new routes for the direct decomposition of N 2 O in industrial exhaust gas.
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PubMed
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Zhe Jiao,Xiudong Shi,Xiaolin Zhang,Xiaofang Zhao,Yueting Wang,Feng Xu,Jing Zhang
Exhaled biomarker detection as a non-invasive and portable analytical method, holds great potential in the field of point-of-care testing. Acetone exhibited a higher concentration in the exhaled breath of diabetic patients compared to healthy individuals. Therefore, the development of a highly sensitive, easy-to-operate, and portable acetone detection technology can be utilized for the rapid screening of diabetes. A covalent organic framework Eu-COF was synthesized, and its fluorescence can be specifically quenched by acetone based on the mechanism of energy competition. A flexible Eu-COF-based fluorescent film was prepared using polyvinyl alcohol (PVA) as the substrate and suited to a 3D printing device portable device for on-site rapid detection of acetone. The linearity of concentration was ranged from 0.2-8.0 mg/m3, with a detection limit of 0.1 mg/m3 (RSD=8.6%). The accuracy of the device was validated by comparison with the results of GC-MS. Based on F-Test, there were no significant differences between the results of portable device and GC-MS. The Eu-COF-based fluorescent film exhibited comparable response in humid environment as well. The detection device integrated sample collection and testing in one step and directly providing the concentration of acetone exhaled by the patient. It can serve as a rapid screening tool for point-of care, non-invasive diabetes detection.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Mengran Ouyang,Huimin Du,Jiahao Wu,Shanshan Hu,Jun Yang
KSrGd(PO 4 ) 2 :Ln 3+ (Ln = Ce, Sm, Eu, Tb, Dy, Dy/Eu, Yb/Ho, Yb/Er, Yb/Tm) phosphors were synthesized by high temperature solid state method. Doping the KSrGd(PO 4 ) 2 matrix with 5%Dy 3+ ions resulted in white light emission under 345 nm excitation. The calculated color temperature (CCT) of this white light is 5523 K, indicating as positive white light. It was found that the luminous intensity of the obtained KSrGd(PO 4 ) 2 :5%Dy 3+ at 200 °C was 76.80 % of that at room temperature, showing good thermal stability as well as possibility of application in white LED. Under the excitation at 392 nm, the fluorescence quantum yield of KSrGd(PO 4 ) 2 :10%Eu 3+ is 79.92 %. Energy transfer between Dy 3+ and Eu 3+ is observed in KSrGd(PO 4 ) 2 :Dy 3+ /Eu 3+ samples, with identified mechanism as the quadrupole-quadrupole interaction. Tunable luminescence ranging from white to yellow then to orange-red is achieved by adjusting the doping concentration of Eu 3+ in KSrGd(PO 4 ) 2 :5%Dy 3+ , x%Eu 3+ . Under the excitation of 980 nm near-infrared light, the prepared KSrGd(PO 4 ) 2 :Yb 3+ /Ho 3+ , KSrGd(PO 4 ) 2 :Yb 3+ /Er 3+ and KSrGd(PO 4 ) 2 :Yb 3+ /Tm 3+ samples showed up-conversion emissions of red, yellow and blue, respectively, with two-photon processes. In KSrGd(PO 4 ) 2 matrix, multi-color and multi-security marks were successfully prepared by utilizing up/down conversion luminescence characteristics, which obtained good anti-counterfeiting effect and improved anti-counterfeiting security. Therefore, the obtained KSrGd(PO 4 ) 2 : Ln 3+ phosphors exhibit promising application prospects in the fields of WLED and multiple anti-counterfeiting.
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2012
·Vol. 88
·期 4
·840-843
·
IF 2.413
Zhan Zhou,Qianming Wang,Jintai Lin,Yanna Chen,Chuqin Yang
Herein, a novel fluorescent indicator for the real-time monitoring of amines is described. This probe contains a complex of europium-(thenoyltrifluoroacetone) 3 (Eu(TTA) 3 ) that efficiently reacts with primary and secondary amines. The electron-withdrawing trifluoroacetyl undergoes a nucleophilic addition with amines, and the complex was used to selectively detect BuNH 2 and Et 2 NH (quenching concentration for BuNH 2 : 10 −4 m , for Et 2 NH: 1.2 × 10 −3 m ) by monitoring emission; no changes were observed in the emission spectrum of Eu(TTA) 3 in the presence of Et 3 N, [Bu 4 N]Cl, or PhNH 2 in aqueous solution (THF/H 2 O = 1:1). The ratio of emission intensity to amine concentration was linear by the least-squares fitting method.
研究领域:
分析化学
·
生物传感
·
分子探针
·
稀土化学
·
有机合成
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高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Lihan Chen,Yuhang Kuang,Kai Han,Zhiguo Xia
Low-dimensional hybrid metal halides have recently gained prominence as next-generation luminescent materials owing to their structural tunability, abundant spectral characters and unique emission mechanisms. Herein, we designed and synthesized three emerging zero-dimensional rare-earth Eu(II)-based hybrid bromides with cyan emission originated from 5d-4f transition of Eu(II). Their photoluminescence quantum yields (PLYQs) are enhanced by molecular-dimensionality-engineering, and the optimized (Me 4 P)EuBr 3 (Me 4 P = tetramethylphosphonium) with a high PLQY of 96.1% shows a narrow emission band peaking at 495 nm with a full width at half maxima of 45 nm upon 390 nm excitation. The as-fabricated white light-emitting diodes (WLED) device based on (Me 4 P)EuBr 3 , commercial K 2 SiF 6 :Mn 4+ and YAG:Ce 3+ , and a 460 nm blue GaN chip achieves a high color rendering index of 92.2. This work not only establishes the structural design and innovation of a new family of hybrid rare-earth halides for efficient photoluminescence, but also provides new phosphor materials for full-spectrum WLED.
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高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 11
·977
·
IF 5.743
Birui Jin,Zhiguo Du,Chuyao Zhang,Zhao Yu,Xuemin Wang,Jie Hu,Zedong Li
Inflammationcaused by viral or bacterial infection is a major threat to human health globally. Blood C-reactive protein (CRP) has been proven to be a sensitive indicator for the occurrence and development of inflammation. Furthermore, a tiny change of blood CRP concentration may portend chronic diseases; therefore, high-sensitivity CRP (hs-CRP) detection in a quantitative, rapid, user-friendly, and low-cost manner is highly demanded. In this paper, we developed a europium-chelate polystyrene microsphere (EuPSM)-based lateral flow immunoassay (LFIA) integrating with a benchtop fluorescence analyzer for hs-CRP detection. The optimization of the EuPSM-based LFIA was implemented through adjusting the antibody density on EuPSM from 100% to 60% of the saturated density. Finally, the limit of detection of 0.76 pg/mL and detection range of 0.025–250 ng/mL were obtained. Moreover, the clinical application capability of the proposed platform was validated through detecting CRP in clinical serum samples, showing high consistency with the results obtained from the clinical standard method. Hence, the proposed EuPSM-based LFIA has been verified to be well suitable for hs-CRP detection, while also showing great applicability for sensitively and rapidly detecting other biomarkers.Keywords:fluorescence analysis;sensitivity enhancement;paper microfluidics;hs-CRP detection
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TALANTA
·
2020
·
IF 5.339
Fangzheng Yuan,Xia Wu,Hui Zhang
An intrinsic Eu(III) luminescence phenomenon of Eu(III) complex was found under near-infrared light (NIRL) excitation of xenon lamp, and the maximum excitation wavelength is about twice the excitation wavelength of its Stokes fluorescence. The NIRL excitation fluorescence was mainly originated from second order diffracted light (SODL) excitation. The Eu(III) complex was consist of Eu(III), Gd(III), 2-trifluoroacetylacetone (TTA) and cetyltrimethylammonium bromide (CTAB). Curcumin (Cur) could notably quench the luminescence intensity of the Eu(III) complex. Based on this, a sensitive method for Cur detection was developed. Under optimum conditions, the decrease extent in the fluorescence intensity at 611 nm exhibited a good linear relationship with the Cur concentration in the range of 2.0 × 10 −9 mol/L - 6.0 × 10 −8 mol/L under 746 nm excitation, the limit of detection (LOD, S/N = 3) was 5.2 × 10 −10 mol/L. While, the linear relationship and the LOD of Stokes fluorescence method ( λ ex / λ em = 360/611 nm) were found to be 1.0 × 10 −8 mol/L - 6.0 × 10 −8 mol/L and 2.6 × 10 −9 mol/L, respectively. The former method is superior to the latter one in Cur detection. Both two methods were successfully applied to determine Cur in real samples. The luminescence mechanism of Eu(III) complex under the NIRL excitation and the quenching mechanism of Cur on the Eu(III) fluorescence was also investigated.
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