DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 26
·8697-8705
·
IF 4.099
Yang Ding,Jie Liu,Ming Zeng,Xishu Wang,Junli Shi,Weili Wang,Yanru Miao,Xibin Yu
Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol–gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable. With the development of nano optoelectronic devices and bioluminescence labeling, there is an urgent need to find an efficient method to prepare nanoscale, monodispersed and NaY(MoO4)2:RE3+ nanocrystals (NCs) with good crystallinity and stronger emission properties. In this work, we demonstrate a simple, fast, reproducible and one-step synthesis of NaY(MoO4)2:Eu3+ NCs with sizes varying from 1–20 nm via a ligand-assisted reprecipitation strategy. The reaction mechanism and emission intensities of NaY(MoO4)2:Eu3+ NCs with various morphologies have been discussed in detail. Furthermore, Tb3+ and Eu3+ ion co-doped NaY(MoO4)2 NCs were also prepared, and various emission colors were obtained and tuned from red, orange-red, yellow and yellow-green to green. Energy transfer between the Tb3+ and Eu3+ ions in the NaY(MoO4)2 host matrix has also been demonstrated. Finally, a highly efficient and stable NaY(MoO4)2:0.05Tb,0.04Eu NC-based W-LED device was built, which indicates the promising future application for this material in the field of lighting. The tunable multicolour emission, ease of preparation and nanosize reveal that NaY(MoO4)2:RE3+ NCs have a potential application in full color displays and W-LEDs.
研究领域:
材料科学
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纳米技术
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光学材料
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无机化学
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光电子学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Weimin Jiang,Shengwei Guan,Chuangyu Wang,Mengxin Chen,Zengming Qin,You Li,Hongwei Ding,Feng Wang
A series of NaLu(MoO 4 ) 2 (NLMO): Sm 3+ phosphors and Sm 3+ , Eu 3+ co-doped NLMO phosphors were synthesized by high-temperature solid-state method. Their crystal structures and luminescent properties were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), fluorescence spectroscopy, fluorescence lifetime, and temperature-dependent emission spectroscopy. XRD results confirm that Sm 3+ and Eu 3+ are successfully doped through isovalent substitution of Lu 3+ sites without destroying the pure NLMO phase structure. Under 405 nm near-ultraviolet excitation, the optimal doping concentration of Sm 3+ is 0.04 mol, and the concentration quenching mechanism is dipole-dipole interaction. Efficient Sm 3+ →Eu 3+ energy transfer is observed in the co-doped system, which is further verified by the fluorescence lifetime measurement of Sm 3+ . The maximum energy transfer efficiency reaches 81%, with the dominant mechanism identified as dipole-dipole interaction. The NLMO:0.04Sm 3+ ,0.07Eu 3+ phosphor exhibits excellent thermal stability, retaining 81% of its emission intensity at 303 K when heated to 383 K, and the thermal quenching activation energy is as high as 0.331 eV. CIE chromaticity coordinates show that the emission color of the phosphor gradually shifts from orange-red to red with increasing Eu 3+ doping concentration, and the correlated color temperature is observed between 1753 K and 2339 K. These results demonstrate that the NLMO:Sm 3+ , Eu 3+ phosphor integrates high energy transfer efficiency, outstanding thermal stability, and precise color tunability, making it an ideal red component for near-ultraviolet excited white light-emitting diodes with significant practical application value.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Kaiming Kan,Shoujun Ding,Shujing Pan,Mengyu Zhang,Wenzhi Su,Yong Zou,Qingli Zhang
In view of the demand for high sensitivity in optical thermometry based on the fluorescence intensity ratio of thermally coupled levels of rare-earth ions, in this work Ca 2+ -modified double molybdate NaBi(MoO 4 ) 2 co-doped with Yb 3+ and Er 3+ was employed as the host to systematically investigate its upconversion (UC) luminescence behavior and optical temperature-sensing performance. Appropriate substitution of Ca 2+ induces lattice distortion and optimizes the local crystal field and energy-level matching, thereby significantly enhancing the energy transfer efficiency between the activator ions. As a result, the green UC emission intensity in the Ca 2+ -doped samples is markedly increased compared with that of the undoped host, and the green-to-red emission intensity ratio is enhanced by 1.7 times, reaching a value of 62, with the corresponding green color purity exceeding 96%. Meanwhile, Ca 2+ doping effectively tunes the thermally coupled levels of Er 3+ , leading to a 2.05-fold improvement in the absolute optical temperature sensing sensitivity relative to the undoped sample, with a maximum absolute sensitivity of 1.793 %·K −1 , which is much higher than that of other reported UC phosphors of similar type. Cyclic temperature sensing measurements confirm that Ca 2+ -modified Y 3+ ,Er 3+ :NaBi(MoO 4 ) 2 exhibits excellent repeatability in the temperature range of 300-460 K, indicating promising application prospects. This study provides a new design strategy and experimental basis for constructing high-performance double molybdate materials that integrate strong UC luminescence with highly sensitive optical thermometry.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Xu Yan,Xiyou Wang,Wei Gu,MiaoMiao Wu,Yan Yan,Bo Hu,Guangbo Che,Donglai Han,Jinghai Yang,Weiqiang Fan,Weidong Shi
Single-crystalline AgIn(MoO 4 ) 2 nanosheets have been successfully fabricated by facile hydrothermal method without any surfactants. Subsequently, Ag/AgBr-grafted AgIn(MoO 4 ) 2 nanosheets were synthesized by the in situ photoreduction of AgBr/AgIn(MoO 4 ) 2 composites prepared by a deposition–precipitation method. Under visible light irradiation. The Ag/AgBr/AgIn(MoO 4 ) 2 composites exhibit a strong absorbance in the visible region because of the surface plasmon resonance absorption of Ag nanocrystals. Compared with bare AgIn(MoO 4 ) 2 nanosheets, Ag/AgBr nanoparticles and Ag/AgIn(MoO 4 ) 2 composites, a dramatic enhancement in the degradation rate of tetracycline (TC) is observed over the Ag/AgBr/AgIn(MoO 4 ) 2 composites. The immense enhancement of the photocatalytic activity is attributed to the extended absorption in the visible-light region, effective charge separation, and synergistic enhancement induced by surface plasmon resonance (SPR) in the heterostructured Ag/AgBr/AgIn(MoO 4 ) 2 . This study provides new insight into the fabrication of highly efficient and stable ternary metal molybdate based plasmonic photocatalysts and facilitates their practical application to solve environmental issues. The mechanism for the photodegradation of TC over Ag/AgBr/AgIn(MoO 4 ) 2 is discussed in detail.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Kaiming Kan,Shujing Pan,Mengyu Zhang,Wenzhi Su,Yong Zou,Shoujun Ding
Monoclinic Yb 3+ /Er 3+ :KBi(MoO 4 ) 2 upconversion phosphors were synthesized by solid-state reaction method. • Lower symmetry induces stronger Stark splitting, enlarging ΔE ( 2 H 11/2 - 4 S 3/2 ) to 859 cm −1 . • The absolute optical temperature sensitivity is improved by ∼1.17× over the tetragonal counterpart. • The optical thermometric of the sample exhibits good reversibility and cycling stability. In this work, Yb 3+ /Er 3+ co-doped KBi(MoO 4 ) 2 (KBM) upconversion (UC) phosphors were successfully synthesized via high-temperature solid-state reaction. Structural characterization revealed that the as-prepared samples crystallize in a monoclinic phase, rather than the conventional tetragonal phase. Under 980 nm excitation, the samples exhibit the characteristic Er 3+ -based UC emissions, and optical thermometric behavior was investigated using the fluorescence intensity ratio (FIR) of the thermally coupled levels of Er 3+ ( 2 H 11/2 / 4 S 3/2 ). Owing to the lower symmetry of the monoclinic lattice, Stark splitting of lanthanide energy levels is enhanced. As a result, the effective energy gap between the thermally coupled levels is markedly enlarged from 506 cm −1 (tetragonal structure) to 859 cm −1 (monoclinic structure). Benefiting from the increased energy separation, the optical thermometric performance is significantly enhanced: the absolute sensitivity is improved by 1.17 times, while the relative sensitivity is increased by 1.75 times compared with the tetragonal counterpart. In addition, cyclic heating-cooling measurements demonstrate good reversibility and stability. By introducing monoclinic-phase KBM:Yb 3+ /Er 3+ phosphors, this work verifies the feasibility of enhancing thermally coupled-level-based optical thermometry in rare-earth double-molybdate systems via crystal-structure regulation, providing an effective strategy for developing high-sensitivity optical thermometric materials. Enlarge Er 3+ thermally coupled level splitting in monoclinic Yb 3+ /Er 3+ Co-doped KBi(MoO 4 ) 2 by structure modification to improving optical thermometry sensitivity. Download: Download high-res image (74KB) Download: Download full-size image
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DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 22
·7826-7834
·
IF 4.39
Xiangyu Zhang,Jialing Wu,Peng Wang,Jie Gao,Feng Gao,Dangli Gao
The majority of the fabrication procedures of lanthanide-doped materials involve thermal treatment that often results in crystallite regrowth, stabilizing the specific crystal structure and resulting in luminescence enhancement. The efficiency and intensity of up-conversion luminescence are closely related to the structure and synthesis process of the materials. Herein, well-crystallized and pure tetragonal NaY(MoO4)2 microcrystals with a uniform octahedral shape have been successfully synthesized via an environmentally friendly hydrothermal method, followed by annealing treatment. The phases, structures, morphologies, and compositions of the synthesized products annealed at 500–1000 °C remain unchanged, indicating high thermal stability. Furthermore, the NaY(MoO4)2:Yb3+/Er3+ microcrystals exhibit strong green emission when irradiated using infrared (980 nm) or ultraviolet (378 nm) wavelengths. Upon 980 nm excitation, up to 37-fold luminescence enhancement is achieved when the samples are annealed at about 700 °C. Interestingly, the high colour purity of the strong green emission is not only independent of the dopant concentration and heat treatment temperature, but it is also independent of the excitation conditions, including power and wavelength, and this makes it particularly suitable as a green safety signal light and luminescent security ink in paintings. As-prepared safety inks with NaY(MoO4)2:Yb3+/Er3+ microcrystals were used for visual fingerprint recognition printed on A4 paper with three-level fingerprint security features, significantly increasing the difficulty of illegal imitation and enhancing the levels of anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Han Pang,Zebin Yu,Xuanning Qin,Ben Fan,Ronghua Jiang,Shuang Li,Yanping Hou,Wenjun Tang,Mi Wang,Zhikai Shi
Stress engineering can improve catalytic performance by straining the catalyst lattice. An electrocatalyst , Co 3 S 4 /Ni 3 S 2 -10%Mo@NC, was prepared with abundant lattice distortion to boost oxygen evolution reaction (OER). With the assistance of the intramolecular steric hindrance effect of metal–organic frameworks, slow dissolution by MoO 4 2- of the Ni substrate and recrystallization of Ni 2+ was observed in the process of Co(OH)F crystal growth with mild temperature and short time reaction. The lattice expansion and stacking faults created defects inside the Co 3 S 4 crystal, improved the material conductivity, optimized the valence band electron distribution of the material, and promoted the rapid conversion of the reaction intermediates. The presence of reactive intermediates of the OER under catalytic conditions was investigated using operando Raman spectroscopy . The electrocatalysts exhibited super high performance, a current density of 10 mA cm −2 at an overpotential of 164 mV and 100 mA cm −2 at 223 mV, which were comparable to those of integrated RuO 2 . Our work for the first time demonstrates that the dissolution–recrystallization triggered by strain engineering is a good modulation approach to adjust the structure and surface activity of catalyst, suggesting promising industrial application.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Chuancheng Zhang,Shoujun Ding,Wenzhi Su,Miaomiao Wang,Haitang Hu,Yong Zou,Wenpeng Liu,Qingli Zhang
Inhomogeneous broadening in disordered crystals has been widely recognized as a successful approach to enhance the spectral bandwidth of rare earth ions in optical spectra, and the Yb3+-doped mixed laser crystals are known as ultrafast pulse materials and have emerged as a hotspot recently. In this study, mixed sodium gadolinium/lanthanum double molybdate disordered laser crystals NaGd(1–x)La(x)(MoO4)2 with x = 0.3, 0.5, and 0.9 were grown by the Czochralski (Cz) method. The structure of as-grown crystals was investigated by XRD, SEM, FT-IR, and Raman experiments. The spectroscopic properties, including absorption, emission, and fluorescence decay characteristics, were investigated thoroughly. The NaGd0.5La0.5(MoO4)2 (NGLM) composite crystal exhibited an exceptionally broad absorption which reaches 70 nm (fwhm) at 980 nm, exceeding those of NaGd(MoO4)2 (NGM) and NaLa(MoO4)2 (NLM). Additionally, the electronic structures (band structure and density of states) of NGM, NGLM, and NLM were determined from the first-principles method combined with the PBE function. The calculations of defect formation energies under O-poor and O-rich conditions demonstrate that the +2 defects are easily generated in the undoped NGM crystal prepared under reducing atmospheres, and the calculation of absorption properties reveals that the black color of NGM without annealing is mainly attributed to intraband transitions between defect induction states and VBM or CBM. Moreover, the lifetimes of excited energy level 2F5/2 of Yb3+ were examined under different experimental environments to obtain the intrinsic radiative lifetime, and the emission cross section was calculated as 2.25 × 10–20 cm2 at 1016 nm. The features of the Yb3+:NaGd(1–x)La(x)(MoO4)2 crystal indicate the potential applications for ultrafast and broad tunable laser through slight regulation of the composite engineering strategy.
研究领域:
材料科学
·
光学
·
物理学
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产品关联
DOI
高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Wenzhi Su,Kaiming Kan,Chuancheng Zhang,Yong Zou,Shoujun Din,Qingli Zhang
The influence of alkali and alkaline earth metal ion doping on the upconversion (UC) luminescence properties of Yb3+, Ho3+ co-doped NaBi(MoO4)2 (NBM) single crystals was systematically investigated. A series of Yb3+, Ho3+:NBM single crystals doped with Li+, K+, and Ca2+ ions were successfully grown using the Czochralski method. Their structural characteristics were analyzed through X-ray diffraction (XRD), transmission spectroscopy, and scanning electron microscopy (SEM), confirming a tetragonal crystal structure with space group I41/a. Under 980 nm and 450 nm laser excitation, the crystals exhibited distinct UC emission profiles, with dominant red and green emissions, respectively. Tauc plot analysis indicated that Ca2+ doping introduced donor levels within the crystal lattice, effectively narrowing the optical bandgap. Power-dependent luminescence studies revealed that both red and green UC emissions originated from two-photon excitation processes. Temperature-dependent photoluminescence measurements under both excitation wavelengths demonstrated that codoping with Li+, K+, and Ca2+ significantly enhanced the thermal stability of the luminescent properties. Furthermore, variable-temperature fluorescence lifetime analyses showed that alkali and alkaline earth metal ion doping effectively mitigated the luminescence lifetimes. Overall, the incorporation of Li+, K+, and Ca2+ ions was found to markedly improve both the UC luminescence intensity and thermal robustness of Yb3+, Ho3+:NBM single crystals, offering promising prospects for high-performance luminescent materials.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qinhan Wu,Pengkun Zhang,Dong-Hau Kuo,Binghong Wu,Adugna Boke Abdeta,Zhengjie Su,Longyan Chen,Osman Ahmed Zelekew,Jinguo Lin,Xiaoyun Chen
Monoclinic lindgrenite (Cu 3 (MoO 4 ) 2 (OH) 2 )-like CuMoOS oxysulfide catalyst with high catalytic activity in the dark was synthesized by a facile method. Hydrazine reduced cations to increase Cu + and Mo 4+ proportions, sulfur doping was used to diminish the problem of poor stability caused by the excessive deviations of the catalyst from electric neutrality due to the high Cu + and Mo 4+ concentrations. The ratios of Cu + /Cu 2+ and Mo 4+ /Mo 6+ ions affected the catalytic activity of CuMoOS catalysts. The CuMoOS with a Cu + /(Cu + +Cu 2+ ) ratio of 0.708 showed abundant oxygen vacancies and the best catalytic reduction effect. Through controlling the Cu + content of the catalyst, its defective structure, and electron transfer resistance, the reduction reaction with NaBH 4 can be effectively adjusted. CuMoOS-3 catalyst shows a complete catalytic reduction of 4-NP (50 ppm) within 4 min 50 ppm MB, RhB and MO organic dyes were completely reduced within 4 min, 6 min, and 8 min, respectively. At the same time, Cr 6+ , as a model heavy metal ion , was completely reduced in 12 min, and its pseudo-first-order reaction kinetic constant reached 0.1709 min −1 . Good stability was kept after six cycling experiments. Therefore, the high-efficiency CuMoOS catalyst synthesized by green procedures displays the potential for industrial application.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Dengke Zhao,Shunlian Ning,Xiaolong Yu,Qikai Wu,Wei Zhou,Jiacheng Dan,Yuguang Zhu,Hao Zhu,Nan Wang,Ligui Li
The exploration of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline conditions is an important way to promote the development of electrolytic water technology . Herein, the reduced graphene oxide-supported MoO 4 2- modified amorphous cobalt metaphosphate cubes (a-Co(PO 3 ) 2 /MoO 4 /rGO) as bifunctional OER/HER catalyst is prepared by anion exchange and phosphating, using the Prussian blue analogue (PBA) as a precursor. The resulting composite exhibits the low overpotentials (η) that of 290 and 50 mV for OER and HER in 1.0 M KOH solution at 10 mA cm −2 , respectively. The electrochemical test and density functional theory (DFT) results reveal that the MoO 4 2- -modified optimizes the adsorption/desorption energy of H* of Co(PO 3 ) 2 , thus enhance the HER activity. Benefiting from efficient HER and OER performances, an efficient and stable alkaline water electrolysis operation using a-Co(PO 3 ) 2 /MoO 4 /rGO used as bifunctional catalyst can be carried out, which can deliver a current density (j) of 20 mA cm −2 at 1.65 V cell voltage and work continuously for 24 h.
研究领域:
电化学
·
材料科学
·
催化
·
可再生能源
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）