JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Yuxuan Luo,Danyu Zhang,Shujun Xu,Lianjie Li,Liping Chen,Hai Guo
Herein, YNbO 4 (YNO):Bi 3+ ,Ln 3+ (Ln = Dy, Eu) phosphors were manufactured though high-temperature solid-phase reaction. Their structural properties, optical characteristics and energy transfer mechanisms (Bi 3+ →Ln 3+ ) were analyzed in detail, and their potential application in optical thermometry was explored. Under 312 nm excitation, YNO:Bi 3+ ,Ln 3+ phosphors show broad emission from Bi 3+ ions ( 3 P 1 → 1 S 0 ) and sharp peaks from 4f-4f transitions of Ln 3+ ions. YNO:Bi 3+ ,Ln 3+ samples exhibit high sensitivity and superior thermochromic properties in temperature sensing. For YNO:Bi 3+ ,Dy 3+ phosphor, the maximum absolute sensitivity ( S a ) and relative sensitivity ( S r ) reach 14.25 %K −1 (573 K) and 1.48 %K −1 (444 K), respectively. For YNO:Bi 3+ ,Eu 3+ phosphor, the maximum S a and S r reach 38.21 %K −1 (573 K) and 1.58 %K −1 (445 K), respectively. And the chromaticity shift of emission from YNO:Bi 3+ ,Eu 3+ phosphor is 0.38 for temperature from 303 to 573 K. Such results suggest that YNO:Bi 3+ ,Ln 3+ phosphors can be candidate for visual and highly sensitive optical thermometry.
研究领域:
材料科学
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光学工程
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhenfeng Xiong,Ying Huang,Nan Li,Chaozhi Zhang,Yonghua Li,Zhuo Yang,Weidong Zhou,Kemei Zhou,Rong Zha,Changdong Sheng
Recovery of rare-earth elements (REEs), especially those of Dy and Nd, from Nd–Fe–B permanent magnets is crucial for sustainable development. Herein, an unsymmetrical pentanediamide extractant, N,N′-dimethyl-N,N′-didecyl-3-oxapentanediamide (DMDDOPDA), was synthesized and characterized for the effective extraction of Dy(III) and Nd(III). DMDDOPDA can form coordination bonds with metal ions because of the strong electron-donating abilities of the N and O atoms. The coordination sites might be inclined toward one side during the extraction. DMDDOPDA exhibited superior extraction performance in the HNO3 system than it did in the HCl system. The highest extraction efficiencies of Dy(III) and Nd(III) under optimal conditions were 99.9% and 99.5%, respectively, while their optimum stripping efficiencies were 100% and 85.3%, respectively. DMDDOPDA extraction of Dy(III) and Nd(III) in the four investigated diluents involved the formation of a neutral coordination complex. This study provides new insights into REE extraction using pentanediamide extractants.
研究领域:
化学工程
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材料科学
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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
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材料科学
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ruo-Ding Mao,Xing Zhang,Yi-Lei Li,Mu Lan,Wen-Ning Ren,Sheng-Jiang Huang,Xin Chang,Bing-Jie Wang,Yan Jiao,Le-Zhong Li,Xiao-Hui Wu
A solid-phase synthesis method was utilized to create a range of ferrite samples, specifically Sr 1- x Dy x Fe 12- x Ni x O 19 , where x values varied (0, 0.01, 0.02, 0.03, and 0.05). Through X-ray diffraction (XRD) analysis, it was found that up to x ≤ 0.03, the XRD pattern showed no discernible impurity phases. However, at x = 0.05, an observable impurity peak attributed to α-Fe 2 O 3 emerged. Room temperature hysteresis loop measurements revealed consistent hard magnetic behavior across all samples. Notably, changes in coercive force directly correlated with magnetocrystalline anisotropy. As substitution increased, the initial saturation magnetization ( M S ) of 59.68 emu/g (at x = 0.00) moderately reduced to 57.79 emu/g (at x = 0.05), representing a modest decline of 3.17 %. A clear trend was observed: decreasing grain size led to diminishing dielectric constants. Moreover, a strong link between the Nyquist diagram's semicircle diameter and sample resistivity was evident, showing distinctive metal-semiconductor behavior. These findings shed light on the structural and magnetic characteristics of Dy and Ni co-substituted SrFe 12 O 19 ferrites, suggesting potential for enhanced performance in advanced magnetic and electronic devices. This study significantly contributes to the field of ferrite materials, deepening our insights and paving the way for innovative applications in diverse technological domains.
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MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Miao Gao,Baosheng Cao,Zhichao Liao,Lulu Qiu,Yangyang He,Bin Dong
This paper explores the detailed photoluminescence (PL) behaviors of Dy 3+ doped CaWO 4 (Dy:CaWO 4 ) phosphors under multi-ultraviolet wavelength excitation. Moreover, it proposes multi-strategy ratiometric thermometry based on luminescence intensity ratio (LIR) from the transitions of thermally coupled energy levels (TCLs) of Dy 3+ . Under excitation of multiple ultraviolet wavelengths, the Dy:CaWO 4 phosphors exhibited multi-wavelength responsive PL characteristics of Dy 3+ with strong blue and yellow emissions from Dy 3+ TCLs transitions. The temperature-dependent PL properties of Dy:CaWO 4 phosphors were investigated over a temperature range of 300∼650 K. Multi-strategy ratiometric luminescent thermometry was examined under various excitation wavelengths by the thermal equilibrium population of Dy 3+ TCLs. The proposed six LIR schemes based on the PL emissions of Dy 3+ exhibited a good quantitative relationship with temperature. They showed well-luminescent thermometric behaviors with high absolute and relative sensitivities due to the largest energy gap of TCLs and a relatively larger LIR value. The thermometry properties of the multiple LIR schemes were independent of excitation wavelength, attributed to the stable site symmetry of Dy 3+ and the thermal equilibrium population of TCLs under different excitation wavelengths. The multi-strategy ratiometric thermometry of Dy 3+ demonstrated the merit of high sensitivity, excellent stability , and repeatability, indicating the potential luminescent thermometric application of Dy:CaWO 4 phosphors.
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JOURNAL OF ELECTRONIC MATERIALS
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2016
·Vol. 45
·期 6
·2974-2980
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IF 1.491
Zheng Yuhui,Hu Jing,Deng Surong,Gao Jinwei,Wang Qianming
High-purity LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm, Dy) phosphors with tetragonal zircon structures were successfully synthesized. The reactions have been carried out by multiple irradiations with very high efficiency. Transmission electron microscope images showed that the phosphors had rod-like structures with average lengths of about 200 nm. The host absorption edge of LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm) shifted to the longer wavelength side. Furthermore, the red emission of Eu 3+ ion and the orange emission of Sm 3+ ion are remarkably enhanced by encapsulating Bi 3+ in LuVO 4 system, whereas in the case of LuVO 4 : Dy 3+ /Bi 3+ , the host absorption and the yellow emission from dysprosium have been suppressed in the presence of Bi 3+ . These novel findings will facilitate their use in the display field.
研究领域:
材料科学
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光学材料
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发光材料
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无机化学
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纳米材料
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2025
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IF 4.9
Lulu Qiu,Baosheng Cao,Yujie Weng,Qianrui Liu,Yufeng Li,Shaowen Wang,Wenna Zhao,Yangyang He,Bin Dong
The harmonic generation effect, a distinct nonlinear optical phenomenon , exhibits unique properties and has critical applications across multiple fields. However, harmonic generation during optical measurements can introduce significant interference or experimental errors. Here, we investigated the photoluminescence (PL) characteristics of Dy 3+ doped CaWO 4 phosphors under near-infrared (NIR) irradiation. Both characteristic yellow and blue emissions of Dy 3+ and a series of NIR-induced harmonic generation were observed. The study demonstrated that Dy 3+ emissions were excited by harmonic generation originating from the dual-grating configuration of a spectrophotometer. Leveraging the divergent temperature-dependent intensity evolution between Dy 3+ emissions and 1.5th harmonic generation, we proposed a novel ratiometric thermometric strategy based on the luminescence intensity ratio (LIR). This new thermometry achieved optimal temperature sensitivity, with a maximum absolute sensitivity of 74.57 × 10 −4 K −1 and relative sensitivity of 2.21 % K −1 , surpassing conventional ratiometric thermometry relying on thermally coupled energy levels. These findings not only clarified the origin of multiplex harmonic generation and its impact on spectral measurement but also harness harmonic generation for innovative applications in optical thermometry.
研究领域:
光学材料
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生物医学工程
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分子成像
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热疗监测
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非线性光学
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Materials Today Communications
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2025
·
IF 4.5
Siwen Pi,Jie Li,Yingde Zhang,Weina Zhou,Hui Liu,Qing Wang
M-type strontium ferrite Sr 0.98 Ce 0.02 Dy x Fe 12- x O 19 ( x =0.00-0.20) doped with Ce-Dy elements was prepared by solid-phase sintering. The X-ray diffraction (XRD) results revealed the formation of the M-type hexaferrite having P6 3 /mmc as a space group along with the co-existence of a secondary DyFeO 3 phase; The field emission scanning electron microscopy (FESEM) results show that the grain boundaries of the samples are clear, the crystallinity is good and the grains have been refined; The purity of the sample can be proved by energy dispersive spectrometer (EDS), and no other elements were found except for doped elements; It is clear that the experimental weight percentages of each element are quite close to the theoretical from the reactants used to synthesize each sample. Meanwhile, the FTIR results show tetrahedral and octahedral tensile vibration peaks induced by Fe–O bonds of M-type strontium ferrite; Through the analysis of the vibrating sample magnetometer (VSM), when the doping amount of Dy element is x =0.08, the coercive force of strontium ferrite is increased. At this time, hard ferrite with high coercive force and high saturation magnetization intensity is prepared. Demonstrating the unlimited potential of M-type strontium ferrite in the fields of magnetic recording and storage devices.
研究领域:
材料科学
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磁性材料
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无机非金属材料
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xiaoyu Song,Xianxian Wang,Xuewen Xu,Xin Liu,Xiaoli Ge,Fanbin Meng
The Sr 2 CaWO 6 : RE 3+ (RE = Dy, Sm and Eu) phosphors with the unusual emissions corresponding to the magnetic-dipole (MD) transition were synthesized via a sol-gel process. The crystal structure, electronic properties, photoluminescence excitation and emission spectra, and fluorescence lifetimes of the as-prepared samples were investigated. X-ray diffraction analysis confirmed that Sr 2 CaWO 6 crystallized in the monoclinic structure with the centrosymmetric monoclinic space group (P2 1 /n). The indirect band gap for Sr 2 CaWO 6 was 4.24 eV, which was calculated within the framework of density functional theory (DFT). The phosphors could be excited by the ultra-violet (UV) light at 280 nm, and exhibited characteristic emissions corresponding to the MD transitions for different RE 3+ ions. The WO 6 groups in the host lattice can absorb UV light efficiently, and then transferred the energy to activator ions. The results indicated that the doped rare earth ions occupied the centrosymmetric site in Sr 2 CaWO 6 lattice. With increasing the concentration of the dopants , the local symmetry of the activator ions can be effectively changed, which resulted in the enhancement of the characteristic emissions dominated by the electric-dipole (ED) transitions of the doped RE 3+ . The Sr 2 CaWO 6 : Sm 3+ phosphor exhibited near white emission under radiation of 280 nm.
研究领域:
材料科学
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光学
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高影响因子
AICHE JOURNAL
·
2026
·
IF 4.4
Pei Qiao,Yi Guo,Yanan Liu,Chenghua Zhu,Di Cheng,Youshan Zhou,Panpan Song
Phthalate esters (PAEs) are pervasive environmental pollutants that require efficient biodegradation. The substrate specificity of PAEs-degrading microorganisms hinges critically on the catalytic selectivity of microbial esterases. To elucidate the molecular basis of the specificity of Type III PAEs esterases, we developed a chromogenic assay and further integrated machine learning-driven enzyme mining with functional characterization and molecular dynamics analysis. A novel microorganism, Acinetobacter sp. DY-1, was isolated with diverse PAEs-degrading capacities. The esterase 1952 from strain DY-1 exhibited broad substrate specificity and high catalytic efficiency, with a marked preference for long-chain PAEs, such as DEHP. Molecular dynamics simulations revealed stable hydrophobic interactions underpinning 1952s affinity for DEHP. Through targeted mutagenesis, we identified key residues (Leu64, Leu68, and His229) that are essential for substrate binding and catalysis. Their substitution with polar residues drastically reduced DEHP degradation, while the G178Y mutant enhanced activity via π-stacking interactions. This study deciphers the structural determinants of PAE esterase specificity, enabling precise enzyme engineering.
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JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Jun Wang,Jianyu Li,Chunyu Jiang,Jianbo Song,Xing Yang,Xiaolong Ma,Kailiang Luo,Peng Wu,Xiaoyu Chong,Jing Feng
Thermal barrier coatings (TBCs) materials with lowered thermal and oxygen ion conductivity can provide thermal and oxidative protection for high temperature hot-end components in aeronautical engines and gas turbines . The rare-earth tantalate RETaO 4 (RE = Dy, Gd and Sm) ceramics with monoclinic (m) phase were successfully synthesized via spark plasma sintering . Oxygen vacancies responsible for the thermal and oxygen ion conductivities of RETaO 4 were demonstrated by atomic-resolution energy dispersive X-ray and X-ray photoelectron spectroscopy . Among the three samples, DyTaO 4 has excellent oxygen/thermal barrier performance. Compared to the current service thermal barrier coating material ZrO 2 -8 wt% Y 2 O 3 (8 YSZ), DyTaO 4 has an ultra-low oxygen ion conductivity benefiting from low oxygen vacancy concentration and strong stretching force constants. The intrinsic thermal conductivity of DyTaO 4 is 68.2% less than that of 8 YSZ . Additionally, the thermal expansion rate curves indicate that the phase transformation does not happen from room temperature to 1200 °C. The above results demonstrate that high-growth rate thermally grown oxide can be retarded by creating dense DyTaO 4 coating with lowered thermal and oxygen ion conductivity.
研究领域:
材料科学
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航空工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bobo Yang,Yuxuan Zhu,Weichen Li,Shiliang Mei,Rongrong Hu,Ruiqian Guo,Jun Zou
Perovskite quantum dots (QDs) glass has been considered as high efficiency, high color-purity, and high stability luminescent materials for display application. Herein, high emissive Dy doped CsPb(Br, I) 3 (CPBI: Dy) QDs glass has been prepared, and the effects of doping concentration on the crystallization behavior of QDs were discussed carefully. The low and high concentration of Dy doping brings diametrically opposite tuning effects for the emission wavelength. When high Dy doping, DyBO 3 nanocrystals were precipitated from the glass along with CPBI QDs. The highest photoluminescence quantum yield of CPBI: Dy QDs glass reached 53.79 %. The LEDs using the CPBI: Dy QDs glass as color converter could express pure-red light of 630 nm peak with a full width at half maximum of only 25.6 nm. What’s more, the color gamut of a white backlight unit based on prepared CPBI: Dy QDs glass film was 125.8 % of National Television System Committee color gamut standard and 94.0 % of Rec.2020, which has great potential in display application.
研究领域:
材料科学
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