JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fang Xu,Shuai Xiong,Yan Yang,Hongwei Yang,Yong Ren,Fei Xie,Guixiang Liu,Bo Dai
In this work, LiZnTi ferrites doped with various V 2 O 5 additives were successfully prepared using hot-press sintering. The influences of V 2 O 5 dopant amount and holding time on phase composition, microstructure and gyromagnetic properties of the low-sintered LiZnTi ferrite were studied. Results showed that the grain growth behavior of the LiZnTi ferrites was closely interrelated with dopant amount and holding time as result of changes of critical driving force ( Δg c ). Moreover, the relative density of all the ferrite samples was very high ( ρ r >99 %). However, we found that the longer holding time (can reduce Δg c ), which is benefit for grain growth and improvement of saturation magnetization (4π M s ) of LiZnTi ferrites, resulted in the deterioration of ferromagnetic resonance (FMR) linewidth ( ΔH ) instead. Finally, due to synergistic effect of applied pressure and V 2 O 5 dopant, the LiZnTi ferrite ( x = 0.10) sintered at 900 °C for 10 mins possessed a small average grain size (GS ave. = 0.69 μm ), very high relative density ( ρ r = 99.35 % ) , high saturation magnetization (4π M s = 4193.2 G s) and a relatively low ferromagnetic resonance linewidth ( ΔH = 449.1 Oe).
研究领域:
材料科学
·
无机非金属材料
·
磁性材料
·
电子陶瓷
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·Vol. 43
·期 10
·2100-2107
·
IF 5.2
Jing Yan,Junyu Hong,Xiaohui Li,Bojana Milićević,Lei Zhou,Chunyan Jiang,Mingmei Wu
Nowadays, high-quality phosphor-converted white light-emitting diodes (pc-WLEDs) ought to include cyan-emitting phosphors allowing for full-spectrum light similar to sunlight. Herein, we report a garnet-structured Ce 3+ -doped SrLu 2 Ga 1.5 Al 2.5 SiO 12 (SLGASO) phosphor that significantly compensates for the absence of cyan light, known as the “cyan cavity”. The SLGASO host crystallizes into a cubic structure with the I a 3 ¯ d space group. The cell parameters were determined using Rietveld refinement. Under 430 nm blue excitation, SLGASO:Ce 3+ emits intense cyan-green light in the 450–700 nm wavelength range. The representative SLGASO:0.07Ce 3+ phosphor has an internal quantum efficiency (IQE) of 95.4% and excellent thermal stability, remaining 92.7% of its initial emission intensity at 152 °C. After 155 d of immersion in water, the luminous intensity of SLGASO:0.07Ce 3+ remains constant, confirming its waterproofness. Furthermore, a pc-WLED device with luminous efficiency (LE) of 101.58 lm/W, color rendering index ( Ra ) of 91, correlated color temperature (CCT) of 4536 K, and Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of (0.3555, 0.3390) was fabricated by combining as-prepared cyan-green-emitting SLGASO:0.07Ce 3+ , yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ), and red-emitting (Ca,Sr)AlSiN 3 :Eu 2+ phosphors, as well as a 450 nm blue chip. These findings indicate that SLGASO:0.07Ce 3+ phosphor can bridge the cyan gap and improve the performance of as-fabricated full-visible-spectrum WLEDs.
研究领域:
材料科学
·
光学材料
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固态照明
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无机化学
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光电子学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2015
·Vol. 41
·期 3
·1550-1558
·
IF 3.313
Meilin Lv,Shuang Ni,Zhuo Wang,Tongcheng Cao,Xiaoxiang Xu
Doping has generally been served as one of the most efficient strategies for the improvement of wide band gap semiconductor photocatalysts . However, atomic arrangements of doped elements in the host crystal structure have often been overlooked, particularly during the investigation and evaluation of dopant functionality. It is known that electronic structures of a semiconductor are profoundly controlled by atomic occupancies in different crystallographic positions. Knowledge about dopant accommodations in the crystal structure and their influence towards photocatalytic performance is highly desired. Here, we investigated four compositional and structural relevant compounds CrNbO 4 , CrTaO 4 , Sr 2 CrNbO 6 and Sr 2 CrTaO 6 with the aim to study the effects of cation ordering/disordering upon their photocatalytic activity . Our results showed that ordered cations, namely Cr and Nb/Ta, are detrimental to the photocatalytic performance. Theoretical calculations indicate that cation ordering would enlarge the band gap and inhibit charge transfer between Cr and Nb/Ta. Our findings imply that ordered dopants in photocatalytic materials would severely offset the benefits of doping and might be a reason for the decreased activity at high doping levels often encountered.
研究领域:
材料科学
·
半导体物理
·
光催化
·
固体化学
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Juping Ma,Yan Sun,Fei Yu,Tianfeng Xue,Lili Hu
Tb 3+ ions doped optical materials have emerged as gain media for green fiber lasers. Dy 3+ ions were proposed as a sensitizer of Tb 3+ ions in glasses to increase the excitation efficiency, yet a systematic understanding of the impact of Dy 3+ doping on spectroscopic and physiochemical properties of glasses remains lacking. Here, using Tb 3+ /Dy 3+ doped fluoride glass as a model system, we reveal that Dy 3+ doping not only enhances Tb 3+ emission intensity, but also increases the thermal stability of fluoride glasses. Detailed spectroscopic characterizations indicate that co-doping Dy 3+ ions boosts visible luminescence intensity of Tb 3+ ions in fluoride glasses due to sensitization of Tb 3+ by Dy 3+ ions. Importantly, we deeply research the energy transfer process , ascertain several important factors affecting energy transfer efficiency and propose optimal doping concentrations of Tb 3+ and Dy 3+ ions for visible emission. We envisage that our finding provides a new perspective for the synthesis of Tb 3+ -doped fluoride glasses with enhanced thermal stability, and may be extended for the fabrication of Tb 3+ -activated optical fibers .
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
稀土掺杂玻璃
·
光纤激光器
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 3
·2241-2251
·
IF 3.84
Xiaohua Sun,Weilong Luo,Linlin Chen,Linjie Zheng,Chao Bao,Panpan Sun,Niu Huang,Yihua Sun,Liang Fang,Lei Wang
Porous Al doped ZnO (AZO) nanosheets have been prepared as an efficient multifunctional water treatment material. Their fundamental properties were characterized by various spectroscopic testing methods. The AZO nanosheets displayed very rapid adsorption rate and high adsorption capacity for methyl orange (MO) dye. The kinetics and equilibrium of adsorption process were found to follow the pseudo-second-order kinetic and Langmuir isotherm models, respectively. Furthermore, the AZO nanosheets exhibited superior photodecolorizative activity compared with the commercial P25 TiO2 nanoparticles. It was found that Al doping increased the zeta potential of AZO nanosheets and then significantly enhanced the adsorption capacity for MO dye and, at the same time, retarded the recombination of photoexcited electron–hole pairs, and prolonged the lifetime of the photo-generated carriers, and then improved the semiconductor photocatalytic activity. In addition, the visible-light-driven dye photosensitized degradation was also an important reason for enhanced photodecolorizative activity. Therefore, AZO nanosheets are a potential multifunctional water treatment material combining highly efficient adsorption and photocatalytic degradation.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jingying Xu,Teng Hou,Jing Zhou,Hao Ye,Yaru Wang,Lvzhu Cheng,Xianglong Li,Bin Yang
Photocatalytic fibrous membranes are regarded as one of the most proficient materials for environmental remediation because of their excellent photocatalytic activity, porous structure, and outstanding recyclability. However, the poor dispersion performance of photocatalysts in the polymer matrix and the low migration ability to the surface constrain the development of this technology. In this study, a versatile strategy was developed to facilitate the design of hydrophilic nanofibrous membranes with promising photocatalytic activity and robust recyclability by combining the loaded rare earth element La 3+ modified TiO 2 photocatalyst, introducing hyperbranched polymers as dispersants within electro-centrifugal spinning, and applying post-treatment to construct hydrophilic sites. Significantly, the removal efficiency of the fibrous membrane materials on the dye wastewater was as high as 89.34 %, and the treatment efficiency can still reach 81.68 % after five cycles. In addition, the photocatalytic mechanism for the degradation of organic pollutants was also analyzed. This work provides a new method for building advanced photocatalytic nanofibrous membranes, which is expected to be used in the treatment and remediation of environmental wastewater.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
化学工程
·
光催化
·
高分子材料
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
S.J. Huang,Y.B. Xiao,J.L. Liu,Y. Ji,L.Y. Mao,W.C. Wang
In this work, a multicomponent GeO 2 –Sb 2 O 3 –BaO (BSG) glass is explored to assess its potential for 1.06 μm fiber lasers . The glass-forming region of BSG system is predicted and determined experimentally based on a thermodynamic method. Benefitting from the incorporation of Sb 2 O 3 , this system possesses an exceptionally large glass-forming region, as well as high density and refractive index , wide infrared transmission range and low phonon energy. Furthermore, an efficient near-infrared emission at 1064 nm from Nd 3+ has been realized in this oxide glass with relatively long measured lifetime (200.58 ± 1.24 μs) and large emission cross-section (3.015 ± 0.090 × 10 −20 cm 2 ), indicating that Nd 3+ -doped BSG glass is a promising candidate for laser application in 1.06 μm region.
研究领域:
光学材料
·
玻璃科学
·
激光物理
·
无机非金属材料
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 1
·1452-1460
·
IF 5.2
Shangwei Wang,Ran Pang,Xuexia Chen,Tao Tan,Qi Wang,Chengyu Li,Su Zhang,Taixing Tan,Hongpeng You,Hongjie Zhang
Near-infrared phosphor conversion light-emitting diode (NIR pc-LED) is a widely used ideal NIR light source due to its unique advantages of low cost, energy saving, compactness and long operational lifetime. However, there is currently a scarcity of appropriate phosphor for NIR light sources utilized in spectral detection, with emission peak larger than 850 nm and steady spectrum output of ultra broadband spectra. Here, a broadband Cr 3+ activated LiScSnO 4 (LSS) phosphor ( λ ex-max = 460 nm) matching the pump band of commercial blue LED chips has been developed, which shows a long wavelength NIR emission peaking at 900 nm. Cr 3+ simultaneously replace the Wyckoff site co-occupied by Sc and Sn in LSS. Due to the difference of local environment of the specific crystal field , two different wide emission bands are caused. These two broad emission bands both contribute to the broadband luminescence with a full width at half maximum (FWHM) of 227 nm. Benefiting from the crystallography consistent Wyckoff position occupation of Cr 3+ ions, the spectral distribution of LSS:Cr 3+ exhibit excellent stability over a wide temperature span (80–423 K). The broadband NIR pc-LED prototype based on LSS:Cr 3+ shows great potential in NIR spectrum detection, night vision imaging applications.
研究领域:
材料科学
·
光学工程
·
固态物理
·
光电子学
·
分析化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 12
·16749-16757
·
IF 5.1
Yihan Liu,Yingjie Mao,Zhichao Zhang,Kai Liu,Denghui Xu,Jun Zhou
Lead-free double perovskites (DPs), characterized by their low toxicity, broad emission spectra and excellent stability, have emerged as highly promising doped hosts with significant potential for visible light applications. However, achieving rich and distinctive multiple photoluminescent (PL) emission through doping with various lanthanide (Ln 3+ ) ions remains a formidable challenge. In this work, we explored the luminescent properties of Cs 2 KInCl 6 , which exhibits intrinsic broad self-trapped excitons (STEs) emission centered at 500 nm. By doping Ln 3+ ions (Dy 3+ , Sm 3+ , and Tb 3+ ) into Cs 2 KInCl 6 , multiple emission could be realized, along with energy transfer (ET) from the intrinsic STEs to Tb 3+ and Sm 3+ ions. Notably, the incorporation of Tb 3+ ions enhanced exciton-phonon coupling and lattice vibrations , resulting in strengthened STEs emission. Furthermore, tunable emission from green to yellow was achieved through multiple ET processes in Cs 2 KInCl 6 :Tb 3+ ,Sm 3+ by co-doping Tb 3+ and Sm 3+ . This work not only offers new insights into enhancing STEs emission in DPs, but also imparts Cs 2 KInCl 6 with tunable PL properties, which makes it a promising candidate for multicolor light-emitting devices.
研究领域:
材料科学
·
光物理学
·
无机化学
·
发光材料
·
半导体材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 11
·19814-19821
·
IF 5.1
Weichang Li,Danping Chen,Lili Hu,Dongbing He,Shubin Chen,Chunlei Yu,Sen Qian,Zhehao Hua,Gao Tang,Ren Jing,Xinyuan Sun,Minghui Zhang,Shan Liu,Hua Cai,Jifeng Han,Shenghua Yin
The large size (4 cm × 4 cm × 1 cm) Ce 3+ -doped high gadolinium oxyfluoride glass with density of 5.83 g/cm³ was prepared by the melt quench method at 1220 °C. The glass is colorless and transparent over the visible range. The prolonged decay time under 275 nm UV light demonstrates the energy transfer from Gd 3+ ions to Ce 3+ ions. The X-ray excited luminescence spectra (XEL) show the emission peak corresponds to the 5d→4f transitions of Ce 3+ ion. The integral emission intensity of glass was compared with that of bismuth germanate oxide (BGO) crystals. The scintillation property of glass was studied under the γ -ray from 137 Cs source and a clear energy peak was observed with light yield (LY) over 1100 ph/MeV. The scintillation decay time comprises fast and slow components. All results presented in this work indicate the appropriate potential to be high-energy rays detecting material for CEPC .
研究领域:
材料科学
·
核物理探测
·
光学材料
·
高能物理
·
无机非金属材料
✓ 已验证
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2017
·
IF 1.554
Jingjing Chen,Yang Zhao,Guanghao Li,Zhiyong Mao,Dajian Wang,Lijian Bie
In this paper, facile synthesis of CaAlSiN 3 :Ce 3+ yellow-emitting phosphors under atmospheric pressure at a moderate temperature and their photoluminescent properties are reported. The prepared CaAlSiN 3 :Ce 3+ phosphors exhibit a broad yellow emission band positioned at 580 nm and covering a bandwidth of 150 nm. The thermal stability of CaAlSiN 3 :Ce 3+ phosphors shows obvious superiority than the commercial YAG: Ce 3+ phosphor, indicating its promising application prospect in power LEDs . In addition, the enhancement of red-light component for CaAlSiN 3 :Ce 3+ phosphor is demonstrated by co-doping Eu 2+ ions. This study offers a facile route to prepare CaAlSiN 3 :Ce 3+ yellow-emitting phosphors, which may be used as a promising candidate for high performance white LEDs .
研究领域:
材料科学
·
发光材料
·
无机化学
·
固态照明
·
光电功能材料
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 10
·期 5
·4090-4096
·
IF 1.5
Jiabin Hao,Lei Zhong,Jintao Liu,Fangli Yang,Hongli Bai,Changwei Su,Junming Guo
Copper-doped lithium manganese spinel LiCu x Mn 2-x O 4 (0 ≤ x ≤ 0.10) as lithium ion cathode material were synthesized by a fameless combustion synthesis at 500 °C for 3 h, two-stage calcination at 600 °C for 3 h. The phase composition was determined by X-ray diffraction (XRD), which indicated that all samples exhibited a single spinel structure except that LiCu 0.08 Mn 1.92 O 4 had a little impurity of Mn 3 O 4 . Micro-morphology of the materials were characterized by scanning electron microscopy (SEM), suggesting particle size of samples was nearly uniform when copper-doped amount x ranged from 0 to 0.06, the particle of LiCu 0.08 Mn 1.92 O 4 and LiCu 0.10 Mn 1.90 O 4 more seriously agglomerated together than that of other samples. The cycle performance tests indicated that the sample LiCu 0.06 Mn 1.94 O 4 had the highest initial discharge specific capacity of 128.1 mA h . g -1 and the 150 th capacity retention was 70.1% at 0.2 C rate. Cyclic voltammetry and electrochemical impedance spectroscopy of the sample LiCu 0.06 Mn 1.94 O 4 illustrated that appropriate copper-doped modification can improve electrochemical reversibility as well as suppress electrochemical impedance.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机功能材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）