ACS Applied Optical Materials
·
2023
·
IF 0
Xiaoya Bu,Yan-gai Liu,Ci’an Xie,Baochen Wang
The long-afterglow luminescent material Sr2MgSi2O7:(Eu, Dy) was combined with the photocatalytic material g-C3N4 to construct a type of Sr2MgSi2O7:(Eu, Dy)/g-C3N4 self-luminous photocatalytic composite. This overcomes the limitation that photocatalytic experiments can only be carried out under an external light source, and it provides a more flexible way to use photocatalytic technology in environmental purification. The morphology, structure, luminescence, and photocatalytic properties of the samples were investigated using a variety of advanced characterization techniques. The results show that the significant improvement in the photocatalytic performance is attributed to the formation of a Z-scheme heterojunction between the luminescent and photocatalytic materials and the promotion of the photocatalytic reaction by the properties of the long-afterglow luminescent material itself. A possible mechanism for the photocatalytic process of the composite is proposed, and it is speculated that the reason for the increased photocatalytic activity is internal electron transfer and electron–hole pair separation based on tests such as X-ray photoelectron spectroscopy and density functional theory calculations. This study provides a strategy for enhancing the photocatalytic activity of photocatalysts and achieving round-the-clock degradation of pollutants.
研究领域:
材料科学
·
环境净化
·
光催化
·
纳米技术
✓ 已验证
DOI
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Min Chen,Zhengli Liang,Xiaoxiao Wang,Jiehua Li,Xingguo Chen,Xingxing Jiang,Zheshuai Lin,Zhen Ma,Hongming Liu
A series of lanthanide-containing water-resistant nitrates, namely RE(OH)2NO3 (RE = Tb(1), Dy(2), Ho(3), and Er(4)), was obtained through the hydrothermal process. As possible nonlinear optical materials, they feature a layered isomorph composed of an [REO3(OH)6] polyhedron and an [NO3] triangle, and the synergistic arrangement of the [REO3(OH)6] and [NO3] groups in their structures leads to their obvious second-order nonlinear optical effect. Nevertheless, the unique optical absorption caused by the electronic transitions on 4f–4f orbitals of lanthanides results in their second harmonic generation responses of different strengths, with 1 exhibiting 5.07 times that of KDP, but 2–4 showing less than half of KDP. In addition, 1 possesses an outstanding water-resistant capacity and a transparent cut-off edge around 300 nm, foreshadowing its potential value as a nonlinear optical crystal. Moreover, 1 is found to emit characteristic green fluorescence due to the typical 5D4 → 7F5 transitions of the excited Tb3+ ions
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zixuan Wang,Haitao Guo,Xusheng Xiao,Yantao Xu,Xiaoxia Cui,Min Lu,Bo Peng,Anping Yang,Zhiyong Yang,Shaoxuan Gu
0.2%–3% weight of Dy 3+ ions doped 64GeS 2 ·16Ga 2 S 3 ·20CdI 2 glasses were synthesized, and their spectroscopic properties were investigated. It was shown that the host glass could dissolve as much as 3% Dy 3+ ions without deteriorating the glass transparency. The mid-infrared (MIR) emissions of the glasses did not present remarkable concentration quenching when the Dy 3+ ions concentration was less than 0.6%. It was also shown that the MIR emission properties could be significantly improved by reducing S H/O H impurities in the glasses. The spectral analyses indicated that the 2.9 and 4.3 μm emissions of Dy 3+ ions in the glass showed relatively large stimulated emission cross sections. The glass doped with as high as 0.4% Dy 3+ ions was successfully drawn into fibers, indicating good potential of the doped glass for MIR lasers.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9211-9222
·
IF 3.277
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors have been synthesized via a one-step hydrothermal route using glycine (Gly) as a surfactant. The phosphors were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and luminescence decays. It was found that various surfactants had a profound influence on the crystal phase, morphology and emission intensity of the final products. Furthermore, the photoluminescence of Ln3+-doped Sc2Mo3O12 phosphors (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) was studied in detail. The energy transfer of MoO42− → Tb3+ (Dy3+) → Eu3+ and multicolor tunable emission occurred by changing the ratio of Tb3+/Eu3+ or Dy3+/Eu3+ under single wavelength excitation. Moreover, the energy transfer mechanism from Tb3+ (Dy3+) to Eu3+ was ascribed to dipole–dipole interactions and the energy transfer efficiency from Tb3+ to Eu3+ (95.3%) was higher than that from Dy3+ to Eu3+ (87.5%). Their tunable multicolor luminescence properties make Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors suitable for many potential applications in the fields of color displays and fluorescent lamps.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Chengkai Zheng,Zaichun Sun,Weiwei Li,Yu Yang,Bingchu Mei
Dysprosium-doped strontium fluoride (Dy: SrF 2 ) nanopowders with the doping concentration of x mol% (x = 0.5, 1.0, 3.0, 5.0, 7.0, 9.0) were synthesized by chemical co-precipitation method, and the composition and morphologies of nanopowders were characterized by XRD and TEM. The results indicated that the grain size and lattice constants of the powders showed a decreasing trend. Dy:SrF 2 transparent ceramics were fabricated by vacuum hot pressing sintering. The transmittance of the ceramics reaches 86.14% in the visible light band while the Dy 3+ ion concentration is 3.0 mol%. Under the excitation of 349 nm, the two significant emission peaks located at 479 nm and 576 nm, which were corresponding to blue emission and yellow emission of Dy 3+ ion, respectively. The emission intensity firstly increased and then decreased with the amount of doping increasing. And the lifetimes decreased continuously with the Dy 3+ ion doping concentration increasing from 1.0 mol% to 9.0 mol%. According to the CIE chromaticity coordinates, Dy:SrF 2 transparent ceramics can achieve white light emission, and the SrF 2 ceramic with 7.0 mol% doping concentration of Dy 3+ ions was the closest to perfect white light. It demonstrates that Dy:SrF 2 transparent ceramics is a potential candidate for solid-state laser materials in visible band.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 13
·
IF 2.7
Zhang Jiahui,Zhang Guangchao,Hou De,Bi Jiachang,Zhang Ruyi,Peng Shaoqin,Yu Pengfei,Zhu Fangyuan,Liu Haigang,Wu Liang,Sheng Zhigao,Du Juan,Cao Yanwei
Element substitution of BaTiO 3 -based compounds has been demonstrated as a powerful way for designing novel electronic materials (such as polar metals and multiferroics). To trigger magnetism into ferroelectric BaTiO 3 , general substituted elements are magnetic transition metals (such as Mn, Fe, and Co). The doping effect of rare-earth elements (such as Dy) in BaTiO 3 -based compounds was barely investigated. Here, we report the coexistence of magnetism and electric polarization in epitaxial Dy 0.5 Ba 0.5 TiO 3 films. The single-crystalline films were synthesized by high-pressure magnetron sputtering. The crystal and electronic structures were characterized by high-resolution x-ray diffraction, x-ray photoemission spectroscopy, and resonant soft x-ray absorption spectroscopy. Room-temperature electric polarization was demonstrated by optical second-harmonic generation. Temperature-dependent magnetic hysteresis loops were measured to reveal the revolution of magnetism on temperature. Surprisingly, it is uncovered that the Curie temperature of electric-polarized Dy 0.5 Ba 0.5 TiO 3 films is around 100 K, far above the critical temperature of non-polarized DyTiO 3 (near 60 K). Our work provides another view to understand the magnetoelectric materials.
研究领域:
材料科学
·
凝聚态物理
·
电磁学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Wenlong Yin,Wendong Wang,Lei Bai,Kai Feng,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The 12 new rare-earth tellurides Ba2MLnTe5 (M = Ga and Ln = Sm, Gd, Dy, Er, Y; M = In and Ln = Ce, Nd, Sm, Gd, Dy, Er, Y) have been synthesized by solid-state reactions. The two compounds Ba2GaLnTe5 (Ln = Sm, Gd) are isostructural and crystallize in the centrosymmetric space group P1̅, while the other 10 compounds belong to another structure type in the noncentrosymmetric space group Cmc21. In both structure types, there are one-dimensional anionic 1∞[MLnTe5]4– chains built from LnTe6 octahedra and MTe4 (M = Ga, In) tetrahedra, but the connectivity between the LnTe6 octahedra and MTe4 tetrahedra is different for the two structure types. On the basis of the diffuse-reflectance spectra, the band gaps are around 1.1–1.3 eV for these compounds. The Ba2MLnTe5 (M = Ga and Ln = Gd, Dy; M = In and Ln = Gd, Dy, Er) compounds are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmTe5 deviates from the Curie–Weiss law. In addition, electronic structure calculation on Ba2MYTe5 (M = Ga, In) indicates that they are both direct-gap semiconductors with large nonlinear-optical coefficients.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYOGENICS
·
2022
·
IF 2.134
Yuwei Chen,Wang Liu,Jingcheng Feng,Ruixin Guo,Feidi Fan,Jun Shen,Guochun Zhang,Heng Tu
A series of lanthanide-rich oxyborates LiLn 6 O 5 (BO 3 ) 3 (LLnOB, Ln = Gd, Tb, Dy, and Ho) have been synthesized using high temperature solid state method. Their magnetic and magnetocaloric properties were investigated upon magnetic susceptibility ( χ ), magnetization ( M ), and isothermal magnetic entropy change ( −ΔS m ) measurements. The maximum − ΔS m, max of LiGd 6 O 5 (BO 3 ) 3 is 44.7 J kg −1 K −1 at 4 K and Δμ 0 H = 9 T, which is higher than the one of commercial Gd 3 Ga 5 O 12 (GGG, −ΔS m, max = 41.8 J kg −1 K −1 at 2 K for Δμ 0 H = 9 T). For LiHo 6 O 5 (BO 3 ) 3 , −ΔS m, max is 14.12 J kg −1 K −1 at 3 K and Δμ 0 H = 2 T, which is also larger than that of Ho 3 Ga 5 O 12 (HoGG, − ΔS m, max = 4.38 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T) and Dy 3 Ga 5 O 12 (DGG, − ΔS m, max = 11.0 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T). These results indicate that LiGd 6 O 5 (BO 3 ) 3 and LiHo 6 O 5 (BO 3 ) 3 may be competitive candidates for applications as magnetic refrigerants. Moreover, thermal stability, infrared spectrum (IR), and ultraviolet–visible-near-infrared diffuse reflectance spectrum (UV–Vis-NIR) were carried out to characterize the title compounds.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 4
·e70713
·
IF 4.2
Shucheng Liu,Shangchao Chi,Kui Chen,Feng Si,Moke Zhou,Bin Tang
A series of fine-grained Dy/Y co-doped BaTiO 3 -based ceramics were prepared by sintering in a reducing atmosphere to evaluate their potential as dielectric materials for base–metal–electrode multilayer ceramic capacitors (BME-MLCCs). X-ray diffraction, scanning electron microscope, transmission electron microscope, and energy-dispersive spectrometer analyses confirmed the formation of a core–shell structure with grain sizes of ∼200 nm, as well as localized interfacial stress at grain boundaries. Among all compositions, the Y5 sample (moderate Y doping, 1.5 mol%) exhibited a high dielectric constant of 2968, maintained excellent temperature stability within the EIA X7P specification (temperature coefficient of capacitance, TCC ≤ ±10%, temperature range from –55°C to 125°C), and suppressed abnormal grain growth. Reliability tests showed that this composition exhibited the longest lifetime and the highest breakdown field. Impedance spectroscopy and COMSOL simulations further substantiated the role of Y 3 + in suppressing vacancy migration and dispersing local electric fields. This study provides a theoretical reference for miniaturized, high-reliability BME-MLCCs.
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Mengran Ouyang,Huimin Du,Jiahao Wu,Shanshan Hu,Jun Yang
KSrGd(PO 4 ) 2 :Ln 3+ (Ln = Ce, Sm, Eu, Tb, Dy, Dy/Eu, Yb/Ho, Yb/Er, Yb/Tm) phosphors were synthesized by high temperature solid state method. Doping the KSrGd(PO 4 ) 2 matrix with 5%Dy 3+ ions resulted in white light emission under 345 nm excitation. The calculated color temperature (CCT) of this white light is 5523 K, indicating as positive white light. It was found that the luminous intensity of the obtained KSrGd(PO 4 ) 2 :5%Dy 3+ at 200 °C was 76.80 % of that at room temperature, showing good thermal stability as well as possibility of application in white LED. Under the excitation at 392 nm, the fluorescence quantum yield of KSrGd(PO 4 ) 2 :10%Eu 3+ is 79.92 %. Energy transfer between Dy 3+ and Eu 3+ is observed in KSrGd(PO 4 ) 2 :Dy 3+ /Eu 3+ samples, with identified mechanism as the quadrupole-quadrupole interaction. Tunable luminescence ranging from white to yellow then to orange-red is achieved by adjusting the doping concentration of Eu 3+ in KSrGd(PO 4 ) 2 :5%Dy 3+ , x%Eu 3+ . Under the excitation of 980 nm near-infrared light, the prepared KSrGd(PO 4 ) 2 :Yb 3+ /Ho 3+ , KSrGd(PO 4 ) 2 :Yb 3+ /Er 3+ and KSrGd(PO 4 ) 2 :Yb 3+ /Tm 3+ samples showed up-conversion emissions of red, yellow and blue, respectively, with two-photon processes. In KSrGd(PO 4 ) 2 matrix, multi-color and multi-security marks were successfully prepared by utilizing up/down conversion luminescence characteristics, which obtained good anti-counterfeiting effect and improved anti-counterfeiting security. Therefore, the obtained KSrGd(PO 4 ) 2 : Ln 3+ phosphors exhibit promising application prospects in the fields of WLED and multiple anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Tingting Li,Jian Gao,Hengheng Wu,Wenlai Mu,Xudong Shi,Mingze Li,Zhidong Zhang,Zhenhua Wang
Magnetic element doping often significantly affects the surface states of topological insulators with broken time-reversal symmetry. Here, we systematically investigate the effects of magnetic rare-earth Dy doping on the structural and electronic properties of Bi 2 Te 3 polycrystalline films synthesized by chemical vapor deposition (CVD). The crystal structure of Bi 2 Te 3 phase can remain intact even when the Dy dopant concentration is as high as 18.9 at.%. Structural analysis reveals that Dy incorporation induces lattice distortions and defect formation, leading to significant disorder and suppressed bulk carrier density. Temperature-dependent resistivity measurements demonstrate a transition from metallic to semiconducting behavior upon Dy doping, indicating bulk carrier localization. Magnetoresistance studies highlight the emergence of weak antilocalization (WAL) at low magnetic fields and non-saturating linear magnetoresistance (LMR) at high fields, signifying the dominance of topological surface states in electronic transport. These findings provide key insights for engineering quantum coherent devices based on magnetic element doped topological insulators.
研究领域:
凝聚态物理
·
拓扑绝缘体
·
材料科学
·
量子输运
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
You Li,Sai Xu,Yuefeng Gao,Yongze Cao,Xizhen Zhang,Hongquan Yu,Yichao Wang,Tianshuo Liu,Baojiu Chen
The intrinsic challenge to thermally responsive photoluminescent materials is pertaining to the limited thermal stability and reproducibility. Most prevailing photoluminescent agents suffer from constraints imposed by their frail chemical structure , rendering them fail to work at elevated temperatures for a long time. This inherent limitation curtails their utility within domains in anti-counterfeiting and encoded information storage. Herein, a series of double perovskite Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors were synthesized using the high-temperature hydrothermal method . Upon ultraviolet light illumination, the blue emission band of self-trapped excitons (STEs) and intrinsic emissions of Ln 3+ are observed. In light of the variations in thermal quenching levels of the two emission centers and the effect of temperature on the lifetime of Ln 3+ , multi-mode thermometers with superior sensitivity are established. Moreover, they also can be used in anti-counterfeiting and encoding information storage, relying on the significant temperature-dependent color variation, excellent thermal stability and repeatability. The unique thermochromic properties and satisfactory stability of Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors bring forward a new concept of developing multi-mode thermometers and reliable information encryption systems with the application of thermochromic materials.
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）