CERAMICS INTERNATIONAL
·
2026
·
IF 6
Suzhen Kang,Zhiqin Wen,Jiyuan Huang,Gaoxiang Wei,Yunming Lv,Jun Peng,Xiwen Qin,Yuhong Zhao
This study synthesizes single-phase high-entropy rare-earth chromates (M 0.2 La 0.2 Eu 0.2 Nd 0.2 Gd 0.2 )CrO 3 (M = Dy, Ho, Er) (HE-RECs) via a solid-state reaction guided by a high-entropy strategy. Their crystal structure, microstructure and magnetic properties are systematically investigated. Results show that all samples crystallize into a dense, single orthorhombic perovskite phase (space group Pbnm ) after sintering at 1350 °C for 48 h. Chemical disorder and local lattice distortion at A-site induce lattice strain and Cr 3+ /Cr 6+ mixed-valence states, forming a unique local structure. This structure effectively modulates the Cr 3+ -O 2- -Cr 3+ super-exchange/Dzyaloshinskii-Moriya (DM) interactions, as well as the f - d coupling between rare-earth ions and the Cr 3+ sublattice by altering CrO 6 octahedral connectivity. Dy-LENGCO exhibits the best total magnetic characteristics: The highest Curie temperature ( T C = 90.65K), the highest saturation magnetism ( M s = 61.44 emu/g) and the best coercivity ( H c = 310.08 Oe). This benefit is related to the high intrinsic magnetic moment of Dy 3+ ions and its magnetocrystalline anisotropy, which allow the effective pinning of domain walls within the distorted lattice. The high coercivity ( H c ) of Dy-LENGCO suppresses the reversal of magnetic moments from thermal fluctuations. This property enables long-term data storage at elevated temperatures, positioning the samples as a candidate for next-generation storage media.
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高影响因子
Microstructures
·
2026
·Vol. 6
·期 2
·N
·
IF 8.5
Min Liu,Yuanqi Qian,Huhui Fu,Yaning Zhang,Jingbing Lu,Qi Xiong,Dapeng Jiang,Huamin Kou,Anhua Wu,Liangbi Su
Lanthanide-doped ultrasmall upconversion nanocrystals exhibit unique optical properties that differ significantly from bulk materials, making them highly promising for diverse applications. However, their widespread applications have long been impeded by extremely weak photoluminescence due to severe surface quenching effect. Herein, we present a Li+-doping-induced phase engineering strategy to achieve significantly enhanced upconversion luminescence in ultrasmall Cs2ZrF6:Yb/Er nanocrystals (NCs). While initial Li+ doping improves crystallinity, yielding up to a 63-fold emission increase, further doping triggers a phase transition to form heterophase nanocrystals consisting of trigonal Cs2ZrF6 and tetragonal LiYbF4. The synergistic effect of improved crystallinity and reduced local symmetry around lanthanide ions results in a 302-fold boost in emission intensity, even as the particle size decreases to ~6.1 nm. Moreover, these ultrasmall nanocrystals display anomalous anti-thermal quenching behavior, with luminescence intensity increasing as temperature rises from 303 to 483 K, driven by defect-mediated energy repopulation. This work not only offers a robust approach for fabricating ultrasmall, high-brightness NCs but also establishes phase engineering as a pivotal mechanism for modulating local crystal field, paving the way for high-performance, thermally stable ratiometric nanothermometry.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2674-2685
·
IF 3.094
Panpan Du,Jing Ma,Qi Zhu,Ji-Guang Li
Garnet-type Li 6 Ca(La 0.97 Yb 0.02 RE 0.01 ) 2 Nb 2 O 12 (RE = Ho, Er, Tm) new phosphors were successfully synthesized via solid reaction at 900°C for 5 hours, whose course of phase evolution, macroscopic/local crystal structure and up-/down-conversion (UC/DC) photoluminescence were clarified. Mechanistic study and materials characterization were attained via XRD, Rietveld refinement, DTA/TG, electron microscopy (FE-SEM/TEM), and Raman/reflectance/fluorescence spectroscopies. The phosphors were shown to exhibit UC luminescence dominated by a ~ 553 nm green band ( 5 F 4 / 5 S 2 → 5 I 8 transition) for Ho 3+ , a ~ 568 nm green band ( 4 S 3/2 → 4 I 15/2 transition) for Er 3+ and a ~ 806 nm near-infrared band ( 3 H 4 → 3 H 6 transition) for Tm 3+ under 978 nm laser excitation, with CIE chromaticity coordinates of around (0.31, 0.68), (0.38, 0.60) and (0.17, 0.24), respectively. Analysis of the pump-power dependence of UC intensity indicated that all the emissions involve a two-photon mechanism except for the ~ 486 nm blue emission of Tm 3+ ( 1 G 4 → 3 H 6 ), which requires a three-photon process. The DC luminescence of these phosphors is featured by dominant bands at ~ 553 nm for Ho 3+ (green, 5 F 4 / 5 S 2 → 5 I 8 transition), ~568 nm for Er 3+ (green, 4 S 3/2 → 4 I 15/2 transition) and ~ 464 nm for Tm 3+ (blue, 1 D 2 → 3 F 4 transition). The UC and DC properties were also comparatively discussed.
研究领域:
材料科学
·
光学
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高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Jiaxin Li,Yujiao Zhang,Pengli Wang,Dan Xiao,Cuisong Zhou
Alloyed upconversion nanoparticles (aUCNPs, NaYbF4:10% Er@NaYF4) with high Yb3+ doping were designed to brighten luminescence, exploring multicolor patterns of information encryption. The luminescence intensity of aUCNPs was 2.3 times higher than that of common doped UCNPs reported (dUCNPs, NaYF4:20% Yb, 2% Er@NaYF4). Furthermore, because of the high Yb3+ doping (90%), both green and red emissions of aUCNPs were enhanced, ∼4.2 and ∼17.2 times stronger than that of NaYF4:20% Yb, 10% Er@NaYF4, respectively. The reasons for the aUCNPs having a brightened luminescence were explored by synthesizing four UCNPs with different structures and comparing their luminescence. These are attributed to their unique features: (1) a larger absorption cross section for accumulating energy, (2) more efficient energy transfer between Yb3+ and Er3+, and (3) their inert shell inhibiting surface quenching. Eventually, three colors including yellow, orange, and red were obtained by combining aUCNPs and neutral red (NR) taking advantage of the inner filter effect (IFE), and aUCNPs were thus successfully applied in information encryption with multicolor patterns.
研究领域:
材料科学
·
光学
·
信息安全
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Maohui Yuan,Kai Han,Linxuan Wang,Xu Yang,Zining Yang,Hongyan Wang,Xiaojun Xu
Lanthanide-based optical ratiometric thermometer is a promising temperature detecting tool for noninvasive temperature measurements. However, owing to the thermal quenching of upconversion luminescence (UCL), the traditional temperature sensing range is limited to less than 600 K. In this work, highly thermally stable UCL is observed through introduced appropriate Cu 2+ ions into LiYF 4 :Yb/Er (20/2 mol%) microcrystals (MCs) and on which are further used for temperature sensing applications. As gradually increases the doping of Cu 2+ ions, the octahedron morphology of LiYF 4 MCs with smooth surfaces gradually aggregates smaller particles on their surface forming diamond-like micro-clusters. Based on the single-particle spectroscopy technique , the temperature-dependent UCL properties were systematically investigated and demonstrated. Doping of Cu 2+ ions can efficiently adjust and enhance the UCL in the LiYF 4 :Yb/Er (20/2 mol%) MCs. The UCL thermal quenching temperature is less than ~670 K for Cu 2+ -free MCs. In contrast, the quenching temperature extends to as high as ~870 K when doping with 2 mol% Cu 2+ ions. Furthermore, these highly thermal stable MCs are utilized to detect the temperature in a wide temperature ranging from 298 K to 873 K. A maximum relative sensitivity ( S r ) of 1.23%K −1 at 298 K is obtained and temperature uncertainty δ T < 0.091 K is determined under the measured temperature for the 2 mol% Cu 2+ -doped MCs. The highly thermally stable UCL properties and excellent thermometer performance of these MCs, particularly conducted at single-particle spectroscopy technique , can be potentially applied to micro-scale thermometers.
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高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Chen Xu,Zhou Donglei,Xu Wen,Zhu Jinyang,Pan Gencai,Yin Ze,Wang He,Zhu Yongsheng,Shaobo Cui,Song Hongwei
Localized electric filed enhancement by surface plasmon resonance (SPR) of noble metal nanoparticles is an effective method to amplify the upconversion luminescence (UCL) strength of upconversion nanoparticles (UCNPs), whereas the highly effective UCL enhancement of UCNPs in colloids has not been realized until now. Here, we designed and fabricated the colloidal Au-Ag nanocage@NaYF 4 @NaYF 4 :Yb,Er core-shell hybrid with different intermediate thickness (NaYF 4 ) and tunable SPR peaks from visible wavelength region to NIR region. After the optimization of the intermediate spacer thickness (~7.5 nm) of NaYF 4 NPs and the SPR peak (~950 nm) of noble metal nanoparticles, an optimum enhancement as high as ~25 folds was obtained. Systematic investigation indicates that UCL enhancement mainly originates from the influence of the intermediate spacer and the coupling of Au-Ag nanocages with the excitation electromagnetic field of the UCNPs. Our findings may provide a new thinking on designing highly effective metal@UCNPs core-shell hybrid in colloids.
研究领域:
纳米光子学
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等离激元学
·
发光材料
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纳米复合材料
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光学传感
·
生物光子学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Xiaoming Li,Kun Li,Yuchen Zhou,Can Yang,Siqi Liu,Shuo Yang,Jimin Guo,Jianjun Zhang
Hydrogel matrix responds hierarchically to pathological periodontal milieu, including glucose and reactive oxygen species. • Activation energy for hydrogel degradation: 44.2 kJ/mol (glucose), 46.8 kJ/mol (H 2 O 2 ), and 22.3 kJ/mol under concurrent dual stimuli. • Dual stimuli accelerated matrix erosion and released MINO/GSK, achieving fastest, severity-scaled maximal release within 24 h. • GSK attenuated ER stress-driven inflammation, enhancing periodontal tissue tolerance to MINO. For antibiotic therapy of diabetic periodontitis, the central challenge is to anchor drugs deep inside the periodontal pocket and synchronise their release with pathological periodontal milieu, and to attain peak antimicrobial concentrations within the shortest possible time to rapidly suppress pathogens, avoiding the cytotoxicity or dysbiosis associated with prolonged tetracycline exposure. Existing stimuli-sensitive hydrogels were more focused on the responding independently to individual stimuli, while harnessing the synergistic effect of multiple concurrent stimuli to accelerate release in proportion to disease severity remains largely unexplored. Here, we reported an injectable hydrogel engineered from poly(vinyl alcohol) (PVA) and phenylboronic-acid-grafted hyaluronic acid (HA-APBA) that contains nano‑calcium carbonate (nCaCO₃) co-embedded with the antibiotic minocycline hydrochloride (MINO) and the selective PERK inhibitor GSK2606414 (GSK). Reversible boronate-ester cross-links enabled in-situ gelation within 30 s, meeting chair-side clinical requirements. The matrix responded to the diabetic periodontal milieu, including elevated glucose, ROS, and the acidic microenvironment. Each stimulus synergistically accelerated network erosion, delivering the fastest, severity-scaled maximal release within 24 h. Released MINO rapidly suppressed polymicrobial biofilms, and released GSK attenuated pathogen-induced endoplasmic reticulum (ER) stress-driven inflammation. Moreover, GSK-mediated cytoprotection enhances periodontal tissue tolerance to MINO. By integrating a pathological-milieu-responsive drug-release system with synergistic antimicrobial and ER-stress-modulating chemotherapies, the platform provides a multi-tiered, concerted intervention against diabetic periodontitis.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Ruixin Song,Donglei Zhou,Renhuan Song,Yuqi Wang,Jiyuan Guo,Shangwei Zhou,Enhui Wang,Wei Li,Tingting Zhou,Xue Bai,Hongwei Song
Er 3+ -doped 1540 nm light-emitting diodes (LEDs) are critical components in optical communications C-band, non-trunk communication, bioimaging, and sensing. However, integrating high luminous efficiency with tailored circularly polarized luminescence (CPL) in such LEDs remains a critical challenge. Here, we demonstrate efficient 1540 nm short-wave infrared (SWIR) electroluminescence with distinct CPL in Cs 3 ErCl 6 nanocrystals (NCs)-based LEDs via a synergistic strategy of Sb 3+ /Y 3+ co-doping and camphor ligand modification. Y 3+ doping modulates lattice symmetry, inducing Stark splitting of the Er 3+ energy level and enhancing luminescence intensity. Sb 3+ introduction triggers efficient self-trapped excitons emission at 530 nm, whose energy levels match Er 3+ states to boost energy transfer efficiency. Subsequently, camphor ligand exchange passivates Er 3+ -related defects, increasing the 1540 nm photoluminescence quantum yield to 35.7% and endowing NCs with CPL (asymmetry factor: −3.67 × 10 −2 ) via camphor's chiral structure. SWIR LEDs based on camphor-modified Cs 3 Er 0.7 Y 0.3 Cl 6 : Sb 3+ NCs exhibit a record-high external quantum efficiency of 3.06% at 1540 nm, and first, demonstrate electrically-driven circularly polarized 1540 nm emission with asymmetry factor of −3.08 × 10 −2 . This work presents a synergistic doping-ligand strategy for Er-based halide optoelectronics, offering a versatile platform to develop high-performance long-wavelength devices with integrated efficient emission and tailored polarization, crucial for advancing next-generation optical communication and bioimaging.
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PubMed
高影响因子
ACS Catalysis
·
2026
·
IF 13.6
Rikai Liang,Laiwei Zhang,Chuhan Dai,Shouyu Yao,Xiaotong Li,Kui Yin,Jiaxin Xu,Guoliang Dai,Zhenhui Kang,Ziliang Chen
The oxygen evolution reaction (OER) remains the efficiency bottleneck of alkaline water electrolysis for carbon-neutral hydrogen. Herein, we propose a synergy strategy that couples p−d−f block elements within an intermetallic phase to deploy an ordered ternary ErNi4B alloy, which functions as a self-reconstructing precatalyst for the OER. Operando Raman, differential electrochemical mass spectrometry (DEMS), depth-resolved X-ray photoelectron spectroscopy (XPS), and density-functional theory (DFT) uncover that in situ conversion from ErNi4B to Er-doped NiOOH adsorbed with borate ions during the OER yields an active shell operating via the adsorbate-evolution mechanism, while the metallic core preserves high conductivity, cooperatively optimizing the adsorption free energy of intermediates and suppressing the leaching of active Ni species. Benefiting from these aspects, the precatalyst demands only 338 mV to deliver 500 mA cm−2 and sustains industrial current density higher than 600 mA cm−2 for 1000 h. Meanwhile, it also showed high potential as an anode for anion exchange membrane water electrolysis. These findings redefine the shell-active/bulk-conductive paradigm and offer a general stoichiometric-phase roadmap to design ultrastable and non-precious OER precatalysts toward carbon-neutral hydrogen.
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高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2023
·
IF 3.4
Chenhui Gu,Xuewen Hu,Baixi Shan,Xiaojing Wu,Jun Chen
Er-Miao-Wan formula (EMW), composed of Phellodendri Chinensis Cortex and Atractylodis Rhizoma, is widely used in the treatment of hyperuricemia (HUA), gout, and related complications as a classic compound formula. However, its mechanisms for the treatment of HUA still need to be further systematically investigated. The study aimed to perform modern analytical techniques to elucidate the mechanisms of EMW in improving the symptoms of HUA from the perspective of metabolomics. We used a high-fructose diet to establish a rat model of HUA to evaluate the effects of EMW on improving HUA. Next, we established a targeted metabolomics analysis method to quantitatively analyze purine metabolites in plasma by using ultra-high-performance liquid chromatography with ultraviolet and triple quadrupole mass spectrometry (UHPLC-UV-QQQ MS), and combined with plasma non-targeted metabolomics analysis by using ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-Q/TOF MS) to clarify the potential mechanisms of EMW to improve HUA. Oral administration of EMW could significantly increase the urinary uric acid and decrease the serum uric acid, and exhibited a remarkable effect on improving HUA. Plasma targeted metabolomics analysis showed that six purine metabolites related to HUA, including uric acid, hypoxanthine , xanthine , deoxyadenosine , deoxyguanosine , and deoxyinosine , were changed in the EMW-treated group. Further, principal component analysis (PCA) and partial least squares discrimination analysis (PLS-DA) showed that the mechanism of EMW interfering with purine metabolic pathway in the rats with HUA could be different from that of allopurinol . On the basis of plasma non-targeted metabolomics, PCA and orthogonal partial least squares discriminant analysis (OPLA-DA) screened and identified 23 potential biomarkers in the rats with HUA, and 11 biomarkers showed a trend of reversion after the intervention of EMW. The pathway analysis suggested that EMW might have therapeutic effects on the rats with HUA via the metabolic pathways including phenylalanine metabolism, glycerophospholipid metabolism, and tryptophan metabolism. In this study, a plasma targeted metabolomics method that can simultaneously quantify nine purine metabolites in rats with HUA was established for the first time, which can be used to study diseases closely related to HUA. In addition, we further explored the overall effect of EMW on HUA in combination with the metabonomic method established by non-targeted metabolomics, which was helpful to solve the defect that the pharmacological mechanism caused by multi-components and multi-targets of traditional Chinese medicine was difficult to explain scientifically and comprehensively. In summary, EMW could effectively alleviate the symptoms of high-fructose-induced HUA, and the study provided a reference for the potential therapeutic mechanism of EMW.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Meng He,Jing Feng
In this work, monodisperse β-NaLuF 4 :Yb,Er microcrystals with intense upconversion emission were synthesized via a modified hydrothermal method . With the increase of reactant concentration, their production yield is increased obviously, and the upconversion emission intensity in β-NaLuF 4 :Yb,Er microcrystals is also enhanced significantly. The luminescence enhancement should be attributed to minimal internal OH − defects, validated by a combination of analytical X-ray diffraction (XRD), energy dispersive spectrum (EDS), and Eu 3+ structural probe measurements. We also reveal that high Na + :RE 3+ ratio in the β-NaLuF 4 :Yb,Er microcrystals prepared under Na + -rich reaction will arouse the increased repulsive energy of β-NaLuF 4 microcrystals between F − and OH − anions and then facilitate the substitution of large OH − ions by small F − ions under F − -rich reaction conditions. Minimal OH − concentrations can limit nonradiative relaxation and promote excitation energy harvesting for high upconversion efficiency. The presented results not only offer a facile method for the simultaneous production yield and luminescence intensity increase of β-NaREF 4 microcrystals, but also uncover a better insight into the upconversion emission alterations, which is favorable to broaden their practical applications.
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产品关联
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yaqun Ma,Zhan Wang,Yanxing Wang,Zhenghao Liu,Yukun Wang,Ruichan Lv
Lanthanide-doped biocompatible nanoparticles have promising applications in near-infrared second region imaging due to their high chemical stability, enhanced photostability and sharp emission bandwidth. However, the weak light absorption capacity limits the application of rare-earth nanoparticles (RENPs) for bioimaging. We prepared a coumarin-derived dye sensitized NaYGdF 4 :Yb,Er nanoparticle probe, in which the organic dye enhances photon absorption through the sensitization process, improving the luminescence efficiency of the rare earth particles near 1000 and 1500 nm. In addition, good water solubility and stability of the probe are imparted by coating the particles with amphiphilic polymers distearoyl phosphatidylethanolamine-polyethylene glycol (DSPE-PEG) and polyacrylic acid. This composite probe with good biocompatibility and NIR II luminescence properties can be used for vascular imaging, providing a tool for the detection of hematologic-related diseases.
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高影响因子
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