Analytical Methods
·
2017
·Vol. 9
·期 20
·2977-2982
·
IF 1.9
Yuanhui Ma,Liping Zhang,Lei Wang,Lun Wang,Hongqi Chen
A novel surface plasmon resonance (SPR) enhanced upconversion (UC) luminescence system was designed for the detection of α-fetoprotein (AFP) by using gold nanoparticle (NP) coated NaYF4:Yb,Er,Gd upconversion nanoparticles (UCNPs) as probes. The gold NP coated NaYF4:Yb,Er,Gd UCNPs had a strong emission at 665 nm and were modified with poly(acrylic acid) (PAA) before being conjugated with anti-AFP (Ab1). When the AFP antigens were added to the system, the binding affinity between AFP and Ab1 resulted in a reduced distance between the gold NP coated UCNPs. The UC luminescence intensity of this system was enhanced because of the SPR properties of the gold NPs. The sensing system exhibited a high sensitivity, good specificity, and wide linear range, 0.098–15.0 ng mL−1 for the detection of AFP (R = 0.99), with a detection limit as low as 0.095 ng mL−1 under optimal conditions. The method was successfully applied to AFP sensing in human serum samples.
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CRYSTENGCOMM
·
2015
·Vol. 17
·期 31
·5900-5905
·
IF 4.034
Bin-Bin Ding,Kun Liu,Fu Zhang,Yang Wang,Sheng Cheng,Yang Lu,Hai-Sheng Qian
Upconversion fluorescent nanostructures with controlled sizes and morphologies have attracted much attention due to their potential and important applications in bioimaging, photodynamic therapy, solar cells and so on. In this work, we describe a facile successive process to fabricate β-NaGdF4:Yb,Er nanocrystals coated with an ultrathin layer of CaF2 with enhanced upconversion fluorescence and stability. The as-prepared β-NaGdF4:Yb,Er@CaF2 nanoparticles were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM, JEM 21000), fluorescence spectroscopy (Hitachi High-Technology Corporation, F-2700) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The as-prepared core–shell nanoparticles show enhanced upconversion fluorescence and superior magnetic resonance (MR) relaxivity. In addition, the as-prepared β-NaGdF4:Yb,Er@CaF2 nanoparticles show enhanced chemical stability after surface functionalization and transfer into aqueous solutions.
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Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 1
·1-16
·
IF 21.8
Huang Shan,Wang Mengmeng,Ni Xinjie,Liu Xinqi,Fang Yi,Xiao Qi,Zhang Yue
Catalysts that effectively degrade organic pollutants and exhibit bactericidal properties are highly up-and-compromising for water treatment applications. To overcome the inherent limitation that the rapid recombination of the photogenerated carriers and to extend the practical utility of Bi 2 WO 6 , a flower-like structure of 7 wt.% Er 3+ -doped Bi 2 WO 6 (Er 7% -Bi 2 WO 6 ) capable of oxygen vacancy and crystal defect was synthesized using a straightforward hydrothermal method. Under visible light irradiation (λ > 420 nm), the Er 7% -Bi 2 WO 6 achieved a Rhodamine B (RhB) degradation efficiency of 92% within 80 min, significantly surpassing that of pristine Bi 2 WO 6 . The kinetic rate constant of Er 7% -Bi 2 WO 6 was determined to be 0.0288 min −1 , which is 5.9 times higher than the 0.0049 min −1 observed for Bi 2 WO 6 . Additionally, the bactericidal rate against Escherichia coli after 120 min of visible light exposure was 93.9%, nearly twice that of Bi 2 WO 6 at 49.8%. Density functional theory calculations and experimental results confirmed that doping with Er 3+ introduced lower band gap and more photogenerated carriers, enhanced visible light absorption, and ultimately improved the photocatalytic performance. Electron paramagnetic resonance and radical trapping experiments identified h⁺ and ·O 2 ⁻ as the primary active species generated during the photocatalytic process of Er 7% -Bi 2 WO 6 . The RhB removal rate remained above 90% after five degradation cycles, and the treatment efficacy on actual water samples was 76%. This study highlights the potential of Er-doped Bi 2 WO 6 to enhance both photocatalytic degradation of organic pollutants and bactericidal performance, thereby expanding the application scope of Bi 2 WO 6 in water treatment. Graphical
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chun Liu,Zhenggang Zou,Jiawei Zhu,Jinsheng Liao,Yijian Sun,Herui Wen,Guoliang Gong
The ordered and stable structure of inorganic lattice is the basis of constructing high-efficiency rare earth activated fluorescence, solid-state laser or other optical materials. The mixed sensitized and activated rare earth ions usually keeps a uniform space-occupying and the energy transfer depends much on the doping concentration, while the aggregation of rare earth dopants in order is rare. In this work, a series of LuMgGaO 4 phosphors were synthesized and the detail lattice parameters are analyzed through Vietveld refinement and the new CIF file is provided. The site-occupancy of Er 3+ , Yb 3+ shows clustered features and the Er–Yb sublattice structure with various Yb/Er ratios were constructed on the basis of planar triangular lattice. The long-distance excitation energy migration to lattice or defects can be effectively inhibited in case of the hexagonal circle Er-6Yb sublattice, in which the most intense green/red UCL was obtained. All the results demonstrate the novelty of regulating ordered site-occupancy of rare earth ions on a compact planar triangular lattice with higher efficiency of energy migration, which will pave a way for developing phosphor-converted materials or laser materials with better performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yangbo Wang,Yue Pan,Yufei Ma,Xinying Sun,Yaqi Zhang,Huaiyong Li
Lanthanide upconversion luminescent materials featuring multi-peak and tunable emissions allow for ratiometric luminescence thermometry in a remote detection manner. However, wide explorations are still required to develop relevant materials for efficient thermometric performances. Herein, Yb 3+ /Er 3+ co-doped non-stoichiometric analogues of bismuth oxyfluoride were obtained by simply tuning the F − /(Bi 3+ + Ln 3+ ) molar ratio of the reactants in a solid-state reaction method, for the first time. We achieved simultaneous regulations in composition , structure, morphology, and upconversion luminescence properties of BiO x F y :Yb/Er (2/1 mol%) microcrystals . Compositional analysis revealed not only the predictable increase of fluorine content, but also the constant O/(Bi + Ln) atomic ratios in all nominal BiO x F y :Yb/Er. Experimental results showed the structure and morphology evolutions from hexagonal-phase micro-flowers, to tetragonal-phase microplates , and further to orthorhombic-phase irregular microcrystals . Benefiting from adjustable composition, structure and morphology, up-conversion luminescence with adjustable intensity and color was obtained. Temperature dependent upconversion properties and ratiometric thermometric performances based on the thermally coupled levels, 2 H 11/2 and 4 S 3/2 of Er 3+ , were explored. BiOF:Yb/Er, BiO 0.67 F 1.66 :Yb/Er, and BiF 3 :Yb/Er microcrystals were found as suitable temperature sensing candidates with operating temperature range as wide as 298−673/723 K, high relative sensitivity up to 1.24% K -1 , and minimum temperature uncertainty of 0.15 K. These results benefit not only further explorations for high-performance lanthanide-based luminescence thermometers, but also the chemistry of fluorides made from the solid-state reaction method.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jun Yu,Hao Yang,Xiangyu Li,Xupeng Chen,Wenyue Li,Xingang Li,Chun Zhang
Semiconductor photocatalytic technology is recognized as one of the effective technologies for using solar energy to solve current environmental problems. In this study, a Z-scheme heterojunction ZnFe 2 O 4 /Er-ZnO hollow nanotube composite was prepared by hydrothermal method. The results show that the degradation efficiency of tetracycline (TC) in ZnFe 2 O 4 is only 51 %, while the degradation efficiency of ZnFe 2 O 4 /2% Er-ZnO hollow tube composites is as high as 97 %. At the same time, ZnFe 2 O 4 /2% Er-ZnO has a larger specific surface area (specific surface area of 224.39 m 2 · g −1 ), which is 27 times that of ZnFe 2 O 4 (specific surface area of 8.30 m 2 ·g −1 ). Density functional theory (DFT) calculations and experimental analysis show that the doping of Er, the unique hollow structure and the formation of heterojunction make ZnFe 2 O 4 /2% Er-ZnO have a large specific surface area, efficient carrier separation ability and strong redox ability, so the Z-scheme heterojunction ZnFe 2 O 4 /2% Er-ZnO hollow tubular composites have strong degradation ability for tetracycline. In addition, the liquid chromatography-mass spectrometry (LC-MS) analysis technique was used to propose the possible degradation pathways of antibiotics, which provided ideas for the treatment of water pollution.
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RARE METALS
·
2023
·Vol. 43
·期 3
·1263-1274
·
IF 8.8
Guo Yue,Qin Lin-Jun,Xu Jing,Jiang Xiao-Ping,Yue Xiao-Yu,Hou Yi,Shi Hao,Wang Li-Xi,Zhang Qi-Tu
Optical temperature sensing based on the fluorescence intensity ratio (FIR) of red emission for lanthanide ions holds significant relevance in non-contact temperature measurement for biological application. In this study, the perovskite-structured KZnF 3 is utilized as a host material for Er 3+ to achieve a high-purity upconversion (UC) red emission. The observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er 3+ . Group theory is employed to decompose the spectral branching of Er 3+ under the point group symmetry of KZnF 3 , allowing for the derivation of Stark splitting energy levels induced by the crystal field effect. The optical temperature-sensing behavior of the red UC luminescence was investigated, specifically examining the FIR of the splitting sub-peaks, which exhibited an exponential relationship with temperature. The KZnF 3 : Yb 3+ , Er 3+ demonstrated a relative sensitivity ( S r ) of 0.00182%·K −1 at 298 K, highlighting its excellent response to temperature. Ex vivo bio-thermometry experiments conducted on chicken breast validated the material's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to temperature. These results establish KZnF 3 :Yb 3+ , Er 3+ as a promising material for optical thermometry in various biological applications. Graphic abstract
研究领域:
光学传感
·
材料科学
·
发光测温学
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生物光子学
·
固态物理学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Gang-Gang Yang,Xiao-Jun Hu,Wei Liu,Xia Xu
Endoplasmic reticulum (ER) is the origin of lipid droplets (LD). Excessive lipid exposure results in ER stress which associates with many diseases. However, the change of the lipid droplet viscosity under ER stress is still unrevealed. Hence, it is important to develop a viable tool to investigate the lipid droplet viscosity under ER stress. In this study, a novel viscosity-sensitive fluorescent probe Ru(phen-CA) 3 Cl 2 with long-lived phosphorescence, good spectral stability and large stokes shifts was developed. The probe is prominently located at lipid droplet organelles rather than at lysosome and mitochondria, showing highly sensitive to viscosity. The fluorescence intensity is obviously increased with time under the treatment of dexamethasone and rapamycin. In-vitro and in vivo experiments further confirm that this probe can be used for real-time monitoring the changes of lipid droplet viscosity in response to ER stress. This novel probe provides an effective approach to elucidate the viscosity change in lipid droplets under ER stress.
研究领域:
细胞生物学
·
生物物理学
·
药学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yaxing Han,Ji Chen,Yuefeng Deng,Tianchi Liu,Hailian Li,Deqian Li
The current separation technique of ion-adsorption high yttrium (Y) rare earth ore (high-yttrium ore) using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) and naphthenic acid (NA) has been confronted with low separation efficiency and high acid consumption. This is a consequence of the low selectivity and the difficulty of complete stripping of heavy rare earths (HREEs). Therefore, an innovative separation technique of high-yttrium ore was proposed. The leachate of high-yttrium ore was firstly divided into Erbium (Er) / Thulium (Tm) groups with P507-isooctanol followed by separating Y (III) from the high Y-enrichment of Er (III) group with sec -octylphenoxy acetic acid (CA12)-tri- n -butyl phosphate (TBP). The basic thermodynamics experiments and cascade extraction simulations were conducted to verify the feasibility of this technology. The results show that P507-15vol% isooctanol is superior to P507 in both stripping ability and separation selectivity of HREEs. The first cascade extraction for Er (III) / Tm (III) grouping with P507-15vol% isooctanol was simulated successfully, reducing acid consumption but obtaining high purity products. In theory, the second cascade extraction simulation designed for separating Y (III) with CA12-TBP could not only improve the separation ability between Y (III) and light rare earths (LREEs) but also shorten the extraction stages and reduce the production costs. All these results revealed that this two-step separation process probably provided a promising application prospect for separating high-yttrium ore.
研究领域:
冶金工程
·
稀土化学
·
分离科学与技术
·
资源加工工程
·
湿法冶金
·
萃取分离
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 15
·1145
·
IF 3.2
Mao Tan,Wang Wei,Liu Peilong,Zha Junyan,Bu Xiran,Song Rui,Luo Xueke
To overcome the intrinsic limitations of TiO 2 , specifically its wide band gap and rapid photogenerated carrier recombination, for dyeing wastewater treatment, a Yb 3+ /Er 3+ co-doped TiO 2 -ZnO heterostructure was fabricated by sol–gel method. X-ray diffraction revealed inhibited anatase-to-rutile phase transition. X-ray photoelectron spectroscopy confirmed Ti 2p binding energy shifts, indicating strong electronic interactions between dopants and the host lattice. Ultraviolet–visible diffuse reflectance spectroscopy showed band gap narrowing to 2.927 eV, with upconversion effect extending light absorption to the near-infrared region. Photoluminescence measurements demonstrated suppressed carrier recombination, and XPS confirmed abundant oxygen vacancies. The optimal sample achieved 74.31% methylene blue degradation under visible light for 6 h and 98.58% under ultraviolet light for 2 h, outperforming commercial P25. The Yb 3+ /Er 3+ co-dopants serve dual functions: they act as upconversion centers to harvest low-energy photons and function as electronic modulators that induce Ti 2p binding energy shifts and create oxygen vacancies, thereby enhancing charge separation and surface reactivity. This work integrates rare-earth co-doping with heterojunction engineering to boost TiO 2 photocatalysis.
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 30
·41290-41310
·
IF 7.8
Weng Tianfeng,Lamon Simone,Gan Zongsong,Gu Min,Zhang Qiming
All-optical data encoding provides a route to ultrafast, low-energy photonic memory and computation, yet its implementation is hindered by weak nonlinearities and low emission efficiencies in conventional materials. Upconversion luminescence offers strong nonlinear behavior, but typical hosts suffer from inefficient energy transfer, dilute and randomly distributed dopants, and complex excitation demands. Here, we report thermally crystallized BaYF 5 :Yb,Er glass-ceramics that overcome low upconversion efficiency and dopant inhomogeneity through controlled Er 3+ enrichment within BaYF 5 nanocrystals. Thermal crystallization reduces interionic distances, promoting cooperative Yb 3+ –Er 3+ sensitization and Er 3+ –Er 3+ energy migration. The combination of theoretical modeling and experiments shows efficient population of high-energy emitting states, yielding ultrabright upconversion emission with enhancement factors of 113-, 118-, and 110-fold for the blue, green, and red channels under 980 nm excitation. Optimized nanocrystals also prolong emission lifetimes, suppress nonradiative relaxation, and produce clear saturation behavior. Leveraging strongly nonlinear responses, power- and pulse-width-modulated excitation enables precise control of both spectral and temporal outputs, forming a highly reconfigurable platform. This allows multidimensional data encoding and implementation of fundamental optical logic gates with high fidelity and self-referenced decoding. The system offers robust, secure, and scalable functionality for advanced all-optical information processing applications.
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PubMed
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Yanan Qiao,Wenqin Yang,Daqian Xiao,Houde She,Xiaoping Chen,Jingwei Huang,Lei Wang,Qizhao Wang
Titanium dioxide (TiO2) is considered a promising metal oxide due to its good stability and appropriate conduction band potential. However, photocatalytic carbon dioxide reduction solely with TiO2 is still limited by the low solar energy conversion efficiency. To enhance the photocatalytic carbon dioxide reduction performance, researchers synthesized a composite material based on Er-doped TiO2 and Ce-modified UiO-66(Zr) using a simple solvent evaporation method. The experimental results reveal that compared with pristine UiO-66, this composite material exhibits a significantly improved CO2 conversion rate and product selectivity. The excellent activity of this catalyst is attributed to the direct Z-type heterojunction, which greatly improves photogenerated charge separation. Furthermore, UiO-66 (Zr/Ce)/Er-TiO2 (henceforth U1(0.5% Er-T3)) composite material exhibited excellent cycling stability in five consecutive stability tests, indicating long-term application potential. This research underscores the importance of designing and modifying MOF-based photocatalysts for efficient CO2 reduction and provides valuable insights for the development of sustainable energy conversion systems.
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