MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2019
·
IF 0.559
Yun-Xiang Wen,Wei-Feng Wen,Wen-Tong Chen,Chang-Song Liu,Li-Fa He
A new dysprosium complex [Dy(IA)2(H2O)4]nnNO3 (1; IA is isonicotinic acid anion), was synthesized. The structure was determined by single-crystal X-ray crystallography. Every two neighboring Dy3+ ions are interlinked by two μ2-bridging IA groups to form a one-dimensional (1-D) chain. The chains link to each other through the π···π interactions and yield a three-dimensional (3-D) supramolecular network. This complex displays yellow photoluminescence, which should be due to the 4F9/2 → 6H13/2 transition of the 4f electrons of the Dy3+ ions. The solid-state UV/Vis diffuse reflectance spectrum unveils that this compound has a wide optical band gap of 2.08 eV.
研究领域:
无机化学
·
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6847-6859
·
IF 3.502
Yan Sun,Fei Yu,Meisong Liao,Juping Ma,Xin Wang,Dongbing He,Weiqing Gao,Jonathan Knight,Lili Hu
In this work, we systematically study the spectroscopic properties of Tb 3+ /Dy 3+ co-doped phosphate glasses in the visible spectral region and explore the sensitization role of Dy 3+ in the enhancement of visible fluorescence of Tb 3+ ions. Judd-Ofelt parameters Ω 2 and Ω 4 /Ω 6 of the phosphate glass as host for Tb 3+ are calculated as 21.60 × 10 -20 cm 2 and 0.73, respectively, based on the measured spectral absorption. Multiple energy transfer (ET) routes from Dy 3+ to Tb 3+ and their efficiencies are characterized, and the enhanced fluorescence properties of Tb 3+ are investigated, including the emission spectral strength and the spontaneous emission lifetime as functions of Dy 3+ doping concentration. The efficient nonradiative ET processes between Dy 3+ and Tb 3+ allow a moderate concentration level of Tb 3+ to achieve favorably stronger spectral absorption at blue and ultraviolet wavelengths. Tb 3+ /Dy 3+ co-doped phosphate glass shows promising potential for phosphors and lasing operation at visible wavelengths.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·126006
·
IF 2.142
Yu-Guo Yang,Zhi-Jian Li,Xiang-Gang Zuo,Rui Zhang,Xu-Ping Wang,Qing-Gang Li,Bing Liu,Xian-Shun Lv,Lei Wei,Yuan-Yuan Zhang
We synthesized Dy3+ doped SrLaGa3O7 phosphors via a sintering process at 1350 °C under atmosphere. The X-ray diffraction data demonstrate that they have the pure tetragonal phase, meaning the successful substitution of Dy3+ in SrLaGa3O7 host. Monitoring at 572 nm, Dy3+ doped SrLaGa3O7 phosphors show a series of excitation bands within 275–475 nm. Exciting at 342 nm, Dy3+ doped SrLaGa3O7 phosphors show emission bands in the range of 450–700 nm. The emission bands respectively locate in blue, yellow and right light regions, which respectively correspond to 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 transitions of Dy3+. The concentration quenching is induced by dipole-dipole interactions among neighboring Dy3+ ions. There is only one peak in the thermoluminescence glow curves of Dy3+ doped SrLaGa3O7 phosphors, indicating that there is only one type of trap center in these phosphors. The trap depth is calculated to be 0.754 eV.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 6
·1714-1716
·
IF 2.61
Song Hu,Xianpeng Qin,Chunhua Lu,Guohong Zhou,Zhongzi Xu,Shiwei Wang
Polycrystalline, transparent Dy 3 Al 5 O 12 ceramics were firstly fabricated by a solid-state reaction method using high-purity Dy 2 O 3 and Al 2 O 3 powders. The fully dense Dy 3 Al 5 O 12 ceramic with an average grain size of less than 10 μm was obtained by vacuum sintering at 1820°C for 6 h. The in-line transmittance of the optimized sample reaches 80% in the visible region. Scanning electron microscopy reveals that no secondary phases and almost no pores are observed at grain boundaries or triple junctions, and the fracture mode of the ceramic is mainly transgranular. The Dy 3 Al 5 O 12 ceramic is promising for magneto-optical applications. Verdet constant of the Dy 3 Al 5 O 12 transparent ceramic is as high as −0.41 min·(Oe·cm) −1 .
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xue Bai,Zongqing Jin,Guanjun Xiao,Bo Zou,Qingqin Ge,Nannan Shi,Liwei Jiang,Cheng Sun,Tao Xiong,Yinan Zhang
Lead-free halide double perovskite (HDP) materials have become one of the hot spots due to their remarkable photoelectric properties, including broadband emission due to self-trapped excitons from soft lattice and strong exciton-phonon coupling. However, the optical and optoelectronic properties are hampered in the visible and infrared region, because of a wide or indirect band gap in metal HDPs. So far, doping lanthanide ions is an efficient method to modify the optical properties of HDP materials. Here, we have successfully synthesized dysprosium-based double perovskite (Cs x Rb 3-x DyCl 6-x I x ) crystals through a straightforward hydrothermal method. A very broad band emission covering almost the whole visible spectrum from 400 nm to 700 nm is fulfilled, resulting in a strong white light emission. Further, the hue of the white light can finely be adjusted, via tuning the excitation wavelength. High pressure-induced luminescence enhancement has also been demonstrated. Based on the Cs x Rb 3-x DyCl 6-x I x crystals, we have also fabricated a series of white light-emitting diodes, with the color coordinates of (0.33, 0.33), illustrating its great potential in the solid-state lighting applications. The dysprosium-based double perovskite studied in this work offers us a nice choice for designing HDP-based white light emitting 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 11
·1-15
·
IF 2.8
Zheng Lingling,Wen Juanjuan,Wu Jiayi,Deng Huajuan
This research involved the synthesis of a series of single-phase oxyapatite-type phosphors, Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O:Dy 3+ through a high-temperature solid-state reaction methodology. A comprehensive examination was undertaken to elucidate their crystallographic structure, phase homogeneity, morphological features, photoluminescence (PL) properties, and thermal stability. Phase purity was meticulously assessed via X-ray diffraction (XRD) analysis, confirming the hexagonal crystal system alignment with space group P 6 3 / m (No.176) for the Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O:Dy 3+ phosphors. Excitation at 349 nm revealed a triplet of distinguished emission peaks situated at wavelengths of 480 nm (attributed to the 4 F 9/2 - 6 H 15/2 transition), 572 nm (corresponding to 4 F 9/2 - 6 H 13/2 ), and 664 nm (stemming from 4 F 9/2 - 6 H 11/2 transitions). The investigation pinpointed a 0.05 mol concentration of Dy 3+ as the optimum doping level within the Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O matrix for maximized luminescence. Of note, these phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier E a = 0.37 eV, underscoring their robustness at elevated temperatures. The exhaustive findings from this study for advocating the application of these phosphors in light-emitting 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
CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Zixia Wan,Qiuting He,Jundan Chen,Tayirjan Taylor Isimjan,Bao Wang,Xiulin Yang
As the kinetically sluggish oxygen evolution reaction (OER) is considered to be a bottleneck in overall water splitting, it is necessary to develop a highly active and stable electrocatalyst to overcome this issue. Herein, we successfully fabricated a three-dimensional iron-dysprosium oxide co-regulated in-situ formed MOF-Ni arrays on carbon cloth (FeDy@MOF-Ni/CC) through a facile two-step hydrothermal method. Electrochemical studies demonstrate that the designed FeDy@MOF-Ni/CC catalyst requires an overpotential of only 251 mV to reach 10 mA cm −2 with a small Tafel slope of 52.1 mV dec −1 . Additionally, the stability declined by only 5.5% after 80 h of continuous testing in 1.0 M KOH. Furthermore, a cell voltage of only 1.57 V in the overall water splitting system is sufficient to achieve 10 mA cm −2 ; this value is far better than that of most previously reported catalysts. The excellent catalytic performance originates from the unique 3D rhombus-like structure, as well as coupling synergies of Fe-Dy-Ni species. The combination of lanthanide and transition metal species in the synthesis strategy may open entirely new possibilities with promising potential in the design of highly active OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Liangjun Zhou,Wenxi Wang,Sicen Yu,Bo Nan,Yinggang Zhu,Yang Shi,Haohong Shi,Xingzhong Zhao,Zhouguang Lu
Single-phase and Dy 3+ /Eu 3+ co-doped novel phosphor LiY(MoO 4 ) 2−x (WO 4 ) x :Dy 3+ ,Eu 3+ , emitting white luminescence under near ultraviolet (NUV) light, was prepared through sol-gel method. The preparation and characterization of this phosphor were systematically studied by X-ray diffraction and spectrofluorophotometric measurements. The molar ratio of metal ions and citric acid (R m/c ) and calcination temperature greatly influenced the phase purity of sample, revealing that the pure phase could be obtained by using R m/c = 1:2.5 and calcination temperature = 800 °C. Under NUV excitation, the as-prepared phosphor exhibited the emissions of 485, 572 and 612 nm, which intensities could be affected by the pH and the concentrations of molybdenum and tungsten ions. By doping appropriate concentrations of Dy 3+ and Eu 3+ , white light emitting phosphor LiY(MoO 4 ) 1.2 (WO 4 ) 0.8 :6%Dy 3+ ,7%Eu 3+ with good responsiveness to NUV light was obtained. The Commission Internationale de L’Eclairage chromaticity coordinates were calculated to be (x = 0.334, y = 0.322), close to the D 65 illuminant (x = 0.313, y = 0.329), indicating the potential application for NUV WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Kai-Long Zhong,Xia-Qing Ma,Yue-Hao Tong,Hong Hu,Yu-Xin Chen,Yan-Ni Ling,Min Cui,Tao Jia,Yin-Ling Hou,Wen-Min Wang
Two new dinuclear Dy(III)-based compounds [Dy 2 (HL) 2 ]·2CH 3 OH·CH 3 CN ( 1 ) and [Dy 2 (dbm) 2 (H 2 L) 2 ]·6CH 3 CN ( 2 ) (H 4 L = N', N''-((1E,1′E)-(1,10-phenanthroline-2,9-diyl)bis(methaneylylidene))bis(2-hydroxybenzohydrazide), and Hdbm = dibenzoylmethane) constructed by a large conjugated diacylhydrazone ligand (H 4 L) have been successfully synthesized under solvothermal conditions. The crystal structures, fluorescent properties, and magnetic properties of the two Dy 2 compounds ( 1 and 2) have been systematically studied. Compounds 1 and 2 show different molecule structures (Compound 1 displays a cattail leaf fan shape, while compound 2 displays a pinwheel-shaped cage). Both compounds 1 and 2 show well solvent stability. Moreover, magnetic properties study reveals that compounds 1 and 2 show single-molecule-magnet behaviors with different energy barrier (the anisotropic barriers (Δ E / k B ) is 29.45 K for 1 and 62.52 K for 2 . Compounds 1 and 2 show different magnetic properties due to the different chemical environments around the center Dy(III) ions.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2019
·
IF 0.683
Qing Zhang,Guixian Su
Polysiloxane with amino group as the functional side chain was prepared via equilibrium polycondensation reaction. It was modified with salicylaldehyde and then incorporated with lanthanide ions (Dy3+ and Sm3+) to obtain two luminescent functionalized polysiloxane–lanthanide composite materials. The structures and properties of products were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, ultraviolet–visible absorption spectroscopy, fluorescent emission spectroscopy, and thermogravimetric analysis. The results show that two kinds of lanthanide ions were all incorporated successfully with the functionalized polysiloxanes. The coordination effect exists between the nitrogen atoms on the ligand and the lanthanide ions. In addition, the green and red light emissions that are characteristic of Dy3+ and Sm3+ were achieved.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Haitao Lv,Yanmin Wang,Zhidong Pan,Xiangyu Li,Yehong Zhang
Eu 2+ , Dy 3+ and Zr 4+ ions co-doped strontium aluminate (i.e., SrAl 2 O 4 :Eu 2+ ,Dy 3+ ,Zr 4+ )/molybdate (i.e., Ho 2 MoO 6 or Nd 2 MoO 6 ) with photo-/mechano-luminescence and allochroic effect as multi-optical functional hybrid pigments were prepared via solid state reactions and subsequent mixing. The phosphor and hybrid pigments were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, ultraviolet–visible spectroscopy, L∗a∗b∗ color scale analysis, spectrophotometry and mechanoluminescent measurement. The results show that the optimum luminescent emission intensity of SrAl 2 O 4 :Eu 2+ ,Dy 3+ ,Zr 4+ phosphor can be obtained when 5 mol% Zr 4+ ions is doped into the lattice. Under the excitation of 365 nm wavelength, the hybrid pigments prepared with the phosphor and molybdate at a mass ratio of 1:1 present a green broad band emission located at 460–650 nm due to 4f 6 5d 1 →4f 7 transitions of Eu 2+ ions. The hybrid pigments have the superior mechanoluminescent property and emit light after being exerted by mechanical stresses. Besides, the hybrid pigments also exhibit an allochroic effect under different illuminants. In addition, the anti-counterfeiting of the hybrid pigments as a promising application was also presented.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 1
·469-481
·
IF 5.044
Zheng Xudong,Sun Wen,Li Ang,Wang Bin,Jiang Rong,Song Zhiqiang,Zhang Yuzhe,Li Zhongyu
Because of dysprosium’s unique physical and chemical properties and limited supply, the price of rare earth dysprosium has been high in recent years. Therefore, the study of the method of high efficiency selective separation of dysprosium has the double value of scientific research and practical economy. In this paper, we used periodic cellulose nanocrystals as the basic structure, polyethylenimine and graphene oxide were introduced, combined with imprinting technology, to construct a porous imprinted aerogel and use it for selective adsorption of Dy(III). The physical and chemical properties were characterized by SEM, FT-IR and TGA. It was proved that both polyethylenimine and graphene oxide were crosslinked effectively with cellulose nanocrystals. Adsorption experiments showed that the composite imprinted aerogel could selectively adsorb dysprosium effectively, and the maximum adsorption capacity for Dy(III) was 36.495 mg g −1 . The reproducibility experiment showed that aerogel had good regeneration ability. In conclusion, cellulose nanocrystal aerogel, which is environmentally friendly, efficient and repeatable, is expected to provide a new direction for the recovery of rare earth elements.
研究领域:
材料科学
·
环境科学
✓ 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）