JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Xin Chen,Qingyu Meng
In this study, CaMoO 4 : Eu 3+ phosphors with molar concentrations of 0.01 %, 0.03 %, and 0.1 % were synthesized via the hydrothermal process. The variable temperature PL spectra demonstrated a pronounced decline in the luminescence of MoO 4 2− with the temperature rising, suggestive of typical thermal quenching behavior, whereas the luminescence of Eu 3+ showcased an emerging trend characterized by an initial increase followed by a decline. This phenomenon was attributed to the intensified energy transfer effect from MoO 4 2− to Eu 3+ as the temperature increased. The thermal quenching trends between MoO 4 2− and Eu 3+ exhibited distinct differences, leading to the acquisition of high relative sensitivity when utilizing the FIR of MoO 4 2− and Eu 3+ for temperature sensing. It was found in the experiment that samples with higher Eu 3+ doping concentrations exhibited higher S r . In the CaMoO 4 : 0.1 % Eu 3+ sample, the S r-max reached 3.19 % K −1 at 303 K, which was an excellent value among inorganic materials. The findings of this paper indicate the potential application of CaMoO 4 : Eu 3+ phosphors for optical thermometry.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Li Lv,Junzhong Wang,Wei Wang,Limin Han
In this paper, Y 3+ ions doped CaMoO 4 :Eu 3+ with controlled microstructures were prepared via a hydrothermal method . All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y 3+ as co-doping ions in CaMoO 4 :Eu 3+ lattice. It is found that the lattice of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals contracted with increasing the Y 3+ concentration, resulting in a red shift of 1 A 1 → 1 T 1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1 A 1 → 1 T 1 transition also shifted to lower energy, originating from the charge-transfer between MoO 4 2− group and Eu 3+ ions. When the Y 3+ doping concentration was less than 0.05, the quantum efficiency of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals was all superior to pure CaMoO 4 :Eu 3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y 3+ ions further increasing, Y 3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Jingkun Zhao,Meijie Gao,Zixin Wu,Siyu Gao,Zhongyan Hu,Shangru Zhai,Qingda An,Zuoyi Xiao,Gongbing Zhou
The extensive therapeutic use of tetracycline (TC) in human and veterinary healthcare systems has resulted in notable environmental persistence, with detectable residues increasingly documented in aquatic ecosystems worldwide. While photocatalytic technology has been widely applied for TC degradation, improving the photocatalytic activity of catalysts remains a critical challenge. Improving charge separation efficiency is a key approach to enhance the activity of photocatalysts. In this work, we successfully coupled g-C 3 N 4 and CaMoO 4 on 3D porous carbon via a hydrothermal method. The photocatalytic properties of the composites were determined through the degradation of TC under visible light. Under simulated visible light irradiation, the results demonstrated that the g-C 3 N 4 /CaMoO 4 @C achieved 94.8% degradation of TC under 90 min of light exposure, significantly outperforming pure g-C 3 N 4 and pure CaMoO 4 , which achieved only 39.7% and 39.2% degradation in the same period. And the g-C 3 N 4 /CaMoO 4 @C achieved 73.59% removal of total organic carbon. The photocatalytic activity was investigated by adjusting key parameters, including TC solution pH, initial concentration, and catalyst dosage. The morphology, structure and composition of the catalysts were characterized by XRD, XPS and TEM characterization techniques, and the reasons for the improved performance of the composite photocatalysts were analyzed by combining the results of UV-Vis and PL characterizations, and the photocatalytic mechanism of the catalysts was further explored by ESR characterization.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yangfan Xu,Yue Han,Ruiyang Zhao,Jishu Han,Lei Wang
Photocatalytic hydrogen production technology from water is a more effective and promising method to solve energy and environmental crises. In this work, flowerlike CaMoO4 microspheres were successfully synthesized by an ultrasonic precipitation method and modified with variable concentrations of CdSe NCs. CdSe/CaMoO4 microspheres showed increased light absorption ability, larger relative surface area, lower electrochemical impedance, and longer fluorescence lifetime. The photocatalytic hydrogen production rate of CdSe/CaMoO4 microspheres could reach up to 10 162.33 μmol g–1 h–1. The constructed type-I heterostructure improved the separation of photogenerated electrons and inhibited the rapid recombination of photogenerated electrons and holes, thus enhancing the photocatalytic hydrogen production performance. CdSe/CaMoO4 with high hydrogen production activity would be an efficient photocatalyst for hydrogen production applications.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Xiaoqing Guo,Shuangju Song,Xue Wang,Xue Jiang,Wenqing Lv,Xiaoya Yu,Yuanyuan Han,Liyong Wang
A novel inorganic dual-functional fluorescent chemosensors CaMoO 4 :Eu 3+ has been prepared via solid-state reaction by the assistance of gum arabic (GA). The fluorescence of as-prepared CMO:Eu 3+ was selectively quenched by Fe 3+ and Cr 2 O 7 2− ions in aqueous, resulting in the simultaneous detection of Fe 3+ and Cr 2 O 7 2− ions. The F − anions can recover the fluorescence when Fe 3+ quenching the fluorescence at 615 nm. Moreover, CMO:Eu 3+ displayed high sensitivity for Fe 3+ and Cr 2 O 7 2− assay and the detection limits were 8.26 and 4.78 μM, respectively. The fluorescence quenching mechanism was ascribed to the competitive adsorption between CMO:Eu 3+ and targets. Results indicated that CMO:Eu 3+ could be a promising candidate in Fe 3+ and Cr 2 O 7 2− ions assay in environmental systems.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12958-12967
·
IF 4
Jiejun Pan,Guang Xu,Sixue Ren,Tingjie Xu,Dongrui Li,Mengxin Liu,Xinan Shi,Daocheng Pan
Rare earth-doped metal oxide thin films exhibit remarkable potential for application in anti-counterfeiting, owing to their exceptional fluorescent properties. However, the existing fabrication techniques for these rare earth-doped luminescent thin films are predominantly complex and necessitate high-temperature conditions. In light of this issue, we present a low-temperature method for in situ fabrication of luminescent Ca1−xMoO4:Eux3+ and Sr1−xMoO4:Tbx3+ nanocrystal thin films by a solution deposition process. The developed method has the advantages of simple operation, rapid and low-temperature synthesis. The optimal chemical compositions of molybdate-based luminescent films are Ca0.90MoO4:Eu0.103+ and Sr0.90MoO4:Tb0.103+. Moreover, we evaluate the practical feasibility of luminescent nanoparticle films in the field of anti-counterfeiting by combining the unique fluorescent properties of rare earth ions and designing customized fluorescent patterns.
研究领域:
材料科学
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纳米技术
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光学
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防伪技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10008-10017
·
IF 2.478
Zhai Hai-Fa,Li Wan,Zhang Jie,Xing Dou-Dou,He Yi-Xiao,Zhang Pan-Pan,Liu Hai-Rui,Yang Ji-En,Wang Bo
Polyhedral CaMoO 4 microcrystallites with excitation-induced tunable luminescent characteristics were successfully synthesized by a hydrothermal method. Polyhedral morphologies with different shapes and exposed facets were observed for the samples prepared at different temperatures. Sharp-vertex polyhedron was obtained at 140 °C due to the increase of (001) surface energy and the sample exhibited the strongest PL emission intensity due to its regular polyhedron morphology. Green and blue light emissions were observed separately under different excitation wavelengths in single CaMoO 4 microcrystallites, which can be attributed to the charge transfer transitions within the [MoO 4 ] 2− complex and the shallow defects in the bandgap, respectively. The excitation-induced tunable luminescent characteristics make it to be a promising inorganic single-emitting component for optical applications.
研究领域:
材料科学
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无机化学
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光学材料
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纳米技术
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固体化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 12
·8281-8290
·
IF 3.5
Shumin Duan,Zhenjun Qing,An Liu,Haiyan Li,Yan Xue
Ultra-low temperature sintered ceramics, Li 2 (Mg 1− x Ca x ) 2 (MoO 4 ) 3 ( x = 0.025–0.100), were synthesized using the solid-phase method. XRD analysis revealed that adding Ca 2+ increased the second-phase CaMoO 4 content. Particularly, Li 2 (Mg 0.975 Ca 0.025 ) 2 (MoO 4 ) 3 ceramics exhibited excellent properties: ε r = 9.31, Q × f = 55,400 GHz, and τ f = −38.9 ppm/°C. Incorporating Ca 2+ significantly improved the performance of ceramics. The microwave dielectric properties of Li 2 (Mg 0.9 Ca 0.1 ) 2 (MoO 4 ) 3 ceramics sintered at 650°C showed enhancements: ε r of 9.55, Q × f of 63,500 GHz, and τ f of −10.8 ppm/°C. The rise in ε r can be attributed to polarizability, while a higher packing fraction led to a larger Q × f value, and the reduced distortion of the [Li/Mg/CaO 6 ] octahedra enhanced the τ f value. Moreover, the increased of CaMoO 4 also positively influenced the ceramic's properties. Furthermore, in accordance with the principles of complex chemical bonding, the elevation of ionicity, lattice energy, and bond energy of the Mo–O bond contributed to the enhancement of ε r , Q × f , and τ f , respectively. Raman spectroscopy showed a positive correlation between dielectric loss and full width at half maximum of the Raman peak. Good chemical compatibility between silver and Li 2 (Mg 0.9 Ca 0.1 ) 2 (MoO 4 ) 3 ceramic was demonstrated through our co-firing experiment.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
Eu 3+ /Tb 3+ -doped CaMoO 4 /SrMoO 4 luminescent thin films were deposited by a facile solution method, and were annealed over the temperature range of 350–650 °C. Luminescent thin films were characterized by means of X-ray diffraction (XRD), photoluminescence (PL), UV–vis absorption, scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). In addition, the effects of alkali metal ions (Li + , Na + and K + ) on the luminescence properties of CaMoO 4 /SrMoO 4 thin films were systematically investigated. We found that the optimal chemical compositions for the luminescent molybdate thin films are Ca 0.87 MoO 4 :Eu3+ 0.10, K+ 0.03, Sr 0.82 MoO 4 :Eu3+ 0.15, K+ 0.03, Ca 0.87 MoO 4 :Tb3+ 0.03, Li+ 0.1, and Sr 0.82 MoO 4 :Tb3+ 0.15, Li+ 0.03.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Xin Qian,Yiming Yuan,Zhongjia Wang,Jinkun Yang,Yuxuan Xia,Zuobao Yang,Dongsheng Chen
MCMB was introduced to tune CaMoO 4 and improve its conductivity and active sites. • MCMB limits CaMoO 4 aggregation, disperses particles, and forms conductive paths. • CaMoO 4 @MCMB delivers 701.2 F g −1 and an energy density of 89.4 Wh kg −1 . Calcium molybdate (CaMoO₄) suffers from low intrinsic conductivity and insufficient active sites for ion storage. Herein, mesocarbon microbeads (MCMB) are integrated to construct a CaMoO₄@MCMB composite, where the carbon skeleton prevents nanoparticle agglomeration, ensures uniform dispersion, and builds a continuous conductive network. DFT calculations reveal interfacial electronic coupling between CaMoO 4 and MCMB, supporting the UV–Vis band-gap narrowing trend from 3.81 to 1.61 eV, indicating enhanced charge transfer. As a result, the optimized electrode delivers a specific capacitance of 1396.9 F g −1 at 0.5 A g −1 (2.73 × pristine CaMoO₄). An asymmetric device (CaMoO₄@MCMB//AC) achieves 24.8 Wh kg −1 at 374.99 W kg −1 with 87.2% retention after 5000 cycles. This work provides a carbon-coupling strategy to activate molybdate-based battery-like electrodes for hybrid energy storage. Download: Download high-res image (98KB) Download: Download full-size image
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高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 3
·036201
·
IF 1.929
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
A series of Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films were prepared by a facile solution method, and they were annealed at 550 °C for 2 h. The luminescent properties of the thin films were studied, which involve the energy transfer from Tb3+ to Eu3+. The emission color can be changed from green to red, with increasing Eu3+ doping concentration in Tb3+-doped CaMoO4/SrMoO4 thin films. In addition, it was observed that the PL intensity of Eu3+ will enhance when Tb3+ ions are incorporated into Eu3+-doped CaMoO4/SrMoO4 thin films. The optical band gaps of the luminescent thin films are found to be in the range of 4.49 to 4.72 eV. These results revealed that Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films have a significantly potential application in electroluminescent devices.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaoqing Guo,Shuangju Song,Xue Jiang,Jingru Cui,Yunshuai Li,Wenqing Lv,Haiyan Liu,Yuanyuan Han,Liyong Wang
In this present work, a room temperature coprecipitation method for the synthesis of CaMoO 4 @SiO 2 :Ln (Eu 3+ , Tb 3+ , Dy 3+ ) phosphors was reported. These particles were characterized using X-ray diffraction (XRD), Energy dispersive spectrometer (EDS), Fourier Transform IR spectroscopy (FTIR), scanning electron microscope (SEM), UV-visible spectrophotometer and photoluminescence (PL) respectively. The results indicated that emission intensity of SiO 2 modified samples increased by about 2 times, compared with no-silica modified samples. Multicolor phosphors were also designed by changing the lattice activators (Eu 3+ , Tb 3+ , Dy 3+ ). To further explore its applications, the transparent photoluminescent film was developed through the incorporation of polyvinyl alcohol (PVA), and selective and sensitive detection performance on dichromate was demonstrated in detail. In addition, red emission LED devices was assembled with as-prepared phosphors. The present results provide not only the high-performance phosphors modified by silica , but also a deep explanation of the structure-property relationship of the as-prepared sample. Based on these findings, it can be foreseen that these microparticles will be applied in versatile filed.
研究领域:
材料科学
·
光学
✓ 已验证
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DOI
高影响因子
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