MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Huanhuan Li,Shujat Ali,Wenya Wei,Yi Xu,Haowei Lu,Md Mehedi Hassan,Xiangyang Wu,Min Zuo,Qin Ouyang,Quansheng Chen
In this study, a novel fluorescence approach for the rapid and selective detection of organophosphorus pesticides is presented. The strategy is based on inhibition of acetylcholinesterase (AChE) activity and NaY/GdF 4 :Yb, Er up-conversion nanoparticles (UCNPs) fabricated with manganese dioxide (MnO 2 ) nanosheets. Water-soluble UCNPs were first synthesized, and MnO 2 nanosheets were fabricated on their surface to get an efficient quencher for up-conversion fluorescence. Subsequently, AChE was used to restore the fluorescence by dissociation of MnO 2 nanosheets from the surface of UCNPs. When diazinon was added into the system, AChE activity was irreversibly impeded and resulted in the quenching of fluorescence. The inhibitory effect was linearly dependent on the concentration of the pesticide. Under the optimized conditions, the proposed sensor showed excellent performance for the detection of diazinon with a wide detection range of 0.1 to 30 ng/mL and a low detection limit (LOD) of 0.1 ng/mL. Besides, the system showed a good selectivity and was applied for diazinon detection in adulterated tea samples with a recovery rate of 98% to 111%. The unique advantages of the strategy such as simple, cost-effective, highly selective and sensitive make it an attractive approach for the detection of OPs in tea commodities.
研究领域:
分析化学
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食品安全
·
纳米技术
·
生物传感
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2025
·
IF 7.3
Xiao-Kai Gong,Xiao-Song Zhang,Qian Li,Xing-Yao Zhao,Li-Na Kong,En-Ze Jin,Bao-Zeng Zhou,Jian-Ping Xu,Lan Li
Lead-free perovskites are becoming a focal point in the quest for non-toxic and stable materials for optoelectronic applications. Despite this interest, achieving blue light excitation from the lead-free halide double perovskite Cs 2 AgInCl 6 at room temperature remains a significant challenge, hindering their commercial viability. Here, we address this issue by synthesizing the rare earth lead-free double perovskite Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 :Yb, which demonstrates visible/near-infrared (NIR) light emission at 598 and 1,000 nm upon blue light excitation at room temperature. We show that this excitation stems from complex interactions between energy level splitting induced by Yb and self-trapped exciton energy levels. Notably, we observe that under blue excitation, the photoluminescence intensity increases with temperature. Furthermore, Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 :Yb is integrated into a blue-light-emitting diode, enhancing the conversion efficiency of GaAs solar cells as a down-shifting layer. Ultimately, this research opens new avenues for developing eco-friendly, efficient materials with significant implications for sustainable technology.
研究领域:
材料科学
·
光电子学
·
固态物理
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无机化学
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纳米技术
·
光子学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Shuo Wang,Shuhan Zhang,Xin Li,Dan Huang,William W. Yu,Liang Wang
Near-infrared (NIR) emission underpins biomedical imaging, night vision, and optical communication. Yb 3+ -doped CsPbCl 3 have demonstrated ultrahigh photoluminescence quantum yields via quantum cutting, primarily enabled by a singular defect-assisted energy transfer pathway arising from the substitution of Pb 2+ by Yb 3+ . However, whether additional pathways exist to facilitate visible (VIS)-to-NIR conversion, thereby further enhancing the performance of NIR-emissive devices, remains an open and compelling question. Here, strategic engineering of localized bound excitons (BEs) is proposed in the thermally evaporated CsPbCl 3 :Yb system. Assisted BEs significantly promote energy transfer from CsPbCl 3 matrix to Yb dopants, unveiling a previously unknown excitonic energy transfer channel. Atomic-scale characterization combined with first-principles calculations uncovers a BE-driven excitonic transfer mechanism, specifically implicating Cs-vacancy-induced defects in mediating exciton behavior. These insights lead to the fabrication of high-performance NIR-LEDs with an 8.9% external quantum efficiency and 410 mW·Sr −1 ·m −2 radiance, marking a breakthrough in thermally evaporated NIR (>950 nm) light-emitting diodes.
研究领域:
光电子学
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材料科学
·
钙钛矿发光二极管
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能量转移物理
·
纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Liu Peng,Ren Weijun,Guo Qing,Zhang Zhao,Zhao Xueting,Zhang Zhidong,Dai Wei,Li Bing
Cryogenic refrigeration technology based on magnetocaloric effects plays a critical role in a variety of technological applications. In this paper, we report the cryogenic magnetocaloric effects of a series of sodium-rare earth fluoride samples (Ln = Gd, Tb, Dy, Ho, Er, Tm, Yb) synthesized by the solid-state reaction method. These compounds all crystallize in a hexagonal crystal structure. Down to 2 K, no magnetic ordering was detected, while all compounds show negative Curie–Weiss temperatures indicative of strong antiferromagnetic coupling. Magnetic fields effectively suppress the magnetic fluctuations, leading to a maximum magnetic entropy change of −56 J kg −1 K −1 in NaGdF 4 at the magnetic field change from 0 to 50 kOe. These series of compounds are potentially excellent magnetic refrigerants at low temperatures.
研究领域:
物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yiwei Gao,Bingchu Mei,Weiwei Li,Zhiwei Zhou,Zuodong Liu
Ytterbium-doped strontium fluoride (Yb: SrF 2 ) nanopowders with different amounts of Yb 3+ were synthesized by a co-precipitation method. XRD and FE-SEM measurements were used to characterize the phase composition and morphologies of these nanopowders. The Yb: SrF 2 nanopowders doped with 1–5 at.% Yb 3+ showed the same phase as pure SrF 2 , with a mean particle size of 20 nm. Transparent Yb: SrF 2 ceramics were fabricated by hot-pressing the nanopowders, and the transmittance of 1 at.% Yb: SrF 2 with a thickness of 2 mm was 85% at 1200 nm. The absorption spectra , luminescence spectra, and luminescence decays of the ceramics were also obtained. As the Yb 3+ doping amount increased, the absorption and emission intensities also increased, indicating the absence of a concentration quenching effect in the Yb: SrF 2 ceramics. However, the decay lifetimes decreased with increasing Yb 3+ content, and 1–5% Yb: SrF 2 transparent ceramics had decay lifetimes of 4.58, 3.48, 3.22, and 3.19 ms, respectively.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 28
·14642-14650
·
IF 7.443
Yongmei Ma,Honglin Liu,Zhenzhen Han,Liangbao Yang,Jinhuai Liu
An effective near-infrared (NIR) active photocatalyst, NaYF4:Yb,Tm@TiO2/Ag (UC@TiO2/Ag) core@comby shell composite, was synthesized by a simple three-step hydrothermal process. Under the full-spectrum light of a Xe lamp in UV-Vis absorbance experiments, about 96% of R6G dyes in solution were degraded by UC@TiO2/Ag in 120 minutes, while only about 64% of the dyes were degraded by pure TiO2 under the same conditions. Under a UV-filtered Xe lamp, about 35% of the dyes were degraded by UC@TiO2/Ag in 120 minutes; interestingly, only about 8% of the dyes were degraded by pure TiO2. Under irradiation by a 785 nm laser in surface enhanced Raman scattering (SERS) experiments, the photodegradation rate constants were 0.02612 s−1 for UC@TiO2/Ag and 0.00046 s−1 for TiO2/Ag, indicating a nearly 58 fold improvement. After deducting the photobleaching effect, the photodegradation rate constants for UC@TiO2/Ag under 633 and 532 nm lasers were 0.00715 s−1 and 0.00565 s−1, respectively, revealing a sharp decrease under irradiation at shorter wavelengths. Electron spin resonance (ESR) analysis revealed that the presence of UC in this photocatalytic system certainly induced the increase of ˙OH free radicals with NIR irradiation, i.e. the UC core converts NIR light into ultraviolet (UV) light and initiates excellent photocatalytic activity of the TiO2/Ag comby shell. Furthermore, the decorating of Ag nanoparticles not only enhances the photocatalytic ability, but also provides a structural basis for monitoring the photocatalytic kinetics by the SERS technique. By virtue of monochrome laser lines, SERS analysis provides direct evidence to prove the capability of UC-initiated non-UV photocatalysis and the improvement of the utilization of non-UV lights on TiO2. The results revealed that this new photocatalytic platform can efficiently utilize different bands of the solar spectrum and also find new applications in SERS fields.
研究领域:
材料科学
·
光催化
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纳米技术
·
光谱学
·
环境化学
✓ 已验证
DOI
高影响因子
Nanophotonics
·
2019
·Vol. 8
·期 12
·2215-2223
·
IF 6.908
Er Pan,Gongxun Bai,Yutao Peng,Liang Chen,Shiqing Xu
Ferroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb 3+ /Er 3+ codoped ferroelectrics glass ceramics containing Bi 4 Ti 3 O 12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2012
·
IF 2.023
Zhengwen Yang,Jialun Zhu,Dong Yan,Hangjun Wu,Rongfei Wang,Zhiguo Song,Xue Yu,Yong Yang,Dacheng Zhou,Zhaoyi Yin,Jianbei Qiu
Upconversion inverse opal photonic crystals based on a luminescent matrix of Yb, Er co-doped Y 2 Ti 2 O 7 were synthesized, and their photoluminescence was investigated. By comparing the spectra of the inverse opals with that of the reference sample, the contribution of photonic band gap effect to the upconversion emission was observed in the Y 2 Ti 2 O 7 : Yb, Er inverse opals. Intensity of the green or red upconversion emission from Er 3+ was depressed when the overlapping between the photonic band-gap and Er 3+ ions emission band occurs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81542-81551
·
IF 3.289
Shuwen Zhao,Wei Liu,Xianya Xue,Yushi Yang,Zhiyong Zhao,Youfa Wang,Bin Zhou
In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on β-NaGdF4:Yb3+, Er3+ nanocrystals (UCNC) using tridoping with magnesium (Mg2+) ions. X-ray diffraction (XRD) and inductively coupled plasma–atomic emission spectroscopy data indicated successful incorporation of the Mg2+ ions in β-NaGdF4:Yb3+, Er3+. The effect of the Mg2+ tridopant on the crystal structure, upconversion luminescence, and paramagnetization in β-NaGdF4:Yb3+, Er3+ was investigated in detail. The red, green and violet emission intensities were clearly enhanced and the maximum emission intensities were enhanced by about 9, 6, and 7 times, respectively, by tridoping with 13.5 mol% Mg2+ ions. The possible mechanism for enhancing upconversion emission was determined by the alteration of inter-ionic distance and the distortion of crystal structure based on the XRD data. The paramagnetic property can be modulated by the introduction of Mg2+ ions and the core–shell structure, and this can be ascribed to the change in the gadolinium molar percentage. Additionally, a synergistic effect on emission intensity enhancement was observed in a Mg2+-doped core–shell structure. At last, an improved ligand exchange method has been designed to render oleic acid-stabilized 13.5 mol% Mg2+-doped UCNCs dispersible in water and their three day cytotoxicity was assayed using stem cells. It is expected that this material could be applied in biomedical nanoprobes, bioseparation, magnetic resonance imaging, and so on.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Chuanying Wang,Xianhua Cheng
In this work, β-NaYF 4 :Yb,Er upconversion (UC) film was successfully prepared on silicon (Si) substrate via self-assemble method for the first time. The chemical composition and surface morphology of the UC film were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), X-ray power diffraction (XRD), and scanning electron microscopy (SEM) measurements. To investigate the effects of KH-560 primer film and chemical reactions on the UC luminescence properties of β-NaYF 4 :Yb,Er UC film, decay profiles of the 540 nm and 655 nm radiations were measured. Furthermore, tribological test was applied to qualitatively evaluate the adhesion of the UC film. The results indicate that the UC film has been successfully prepared on Si substrate by covalent chemical bonds. This work provides a facile way to synthesize β-NaYF 4 :Yb,Er UC film with robust adhesion to the substrate, which can be applicable for other UC films.
研究领域:
材料科学
·
光学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhuang Tian,Hongquan Yu,Zhanwen Han,Zhipeng Guan,Sai Xu,Jiashi Sun,Yongze Cao,Yichao Wang,LiHong Cheng,Baojiu Chen
One-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructures , including nanowires, nanotubes , and wire-in-tube architectures, were fabricated via a simple electrospinning technique using a single-nozzle system. The diameters of Y 2 Ti 2 O 7 :Ho/Yb nanowires are between 180 and 200 nm. The Y 2 Ti 2 O 7 :Ho/Yb nanotubes have an outer diameter of 180 nm and a wall thickness of 30–40 nm. In the Y 2 Ti 2 O 7 :Ho/Yb wire-in-tube architectures, the outer diameter of tubes, wall thickness of tubes, and diameter of wire are 180–190, 25–30, and 30–35 nm, respectively. The electrospinning process's environment humidity considerably influences the one-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructure morphology. Further, the upconversion luminescence properties and temperature sensitivity of the one-dimensional Y 2 Ti 2 O 7 :Ho/Yb nanostructure were investigated compared with that of the Y 2 Ti 2 O 7 : Ho/Yb bulk prepared via solid-state reactions. Furthermore, to realize their dual-mode anticounterfeiting function, the Y 2 Ti 2 O 7 :Ho/Yb nanotubes were coated with a rare-earth nitrate (RE (NO 3 ) 3 ) using a homogeneous precipitation technique to obtain core-shell structure nanotubes of Y 2 Ti 2 O 7 :1 mol%Ho/20 mol%Yb @ Y 2 O 3 :10 mol%Eu.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Wei Liu,Shiqing Xu,Lei Lei
Lanthanide doped Sc 2 (MoO 4 ) 3 upconversion (UC) crystals showed distinct negative thermal quenching effect, which show promising applications in the temperature sensing field. However, it is still valuable to develop novel routes to enhance the room temperature UC intensity. Herein, the UC intensity of the Yb/Er (Ho) doped Sc 2 Mo 3 O 12 crystals were significantly enhanced by doping Ca 2+ ions. The incorporation of Ca 2+ ions can break the crystal symmetry around the activators and then promote the 4f-4f transitions followed by the enhanced UC. Especially, the UC intensity of the Sc 2 Mo 3 O 12 :20Yb/1Ho/20Ca was about 100 times than that of Sc 2 Mo 3 O 12 :20Yb/1Ho phosphors. Furthermore, the thermally couple levels based temperature sensing performance was improved after doping Ca 2+ ions. Our results may promote the exploration of novel scheelite structural compounds with superior UC properties.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）