APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2024
·Vol. 130
·期 4
·1-10
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IF 2.5
Song Wenqiang,Zhao Fengjiao,Xu Changyuan,Wang Qun,Yin Hongming
For photoluminescence (PL) properties of Mn 2+ in glass–ceramics are highly dependent on the concentration of Mn 2+ , we experimentally observed the change of Mn 2+ structures from isolated Mn 2+ ion as a tetrahedron, octahedron to Mn 2+ -Mn 2+ dimer in B-P-Zn-K based glass–ceramics with characteristic PL peaks locating at 504 nm, 600 nm, and 660 nm, respectively. Spectral results reveal that condensed Mn 2+ would lead to redshift of PL emission and reduced Luminous intensity caused by concentration quenching, however, with increasing Mn 2+ content, shift of Mn 2+ structure is the determining factor for PL redshift. Moreover, compared with tetrahedral and octahedral Mn 2+ , Mn 2+ -Mn 2+ dimer exhibits highly enhanced PL emission and shortened life span which reveal that transitions of Mn 2+ -Mn 2+ dimer are far more efficient than those transitions in tetrahedral and octahedral Mn 2+ . This enables tuning of color and efficiency of PL emission for Mn-doped glass–ceramics via a simple method. Graphical abstract
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 Energy Chemistry
·
2021
·
IF 9.676
Xuehuan Luo,Lidan Xing,Jenel Vatamanu,Jiawei Chen,Jiakun Chen,Mingzhu Liu,Cun Wang,Kang Xu,Weishan Li
A once overlooked source of electrolyte degradation incurred by dissolved manganese (II) species in lithium-ion batteries has been identified recently. In order to deactivate the catalytic activity of such manganese (II) ion, 1-aza-12-crown-4-ether (A12C4) with cavity size well matched manganese (II) ion is used in this work as electrolyte additive. Theoretical and experimental results show that stable complex forms between A12C4 and manganese (II) ions in the electrolyte, which does not affect the solvation of Li ions. The strong binding effect of A12C4 additive reduces the charge density of manganese (II) ion and inhibits its destruction of the PF 6 − structure in the electrolyte, leading to greatly improved thermal stability of manganese (II) ions-containing electrolyte. In addition to bulk electrolyte, A12C4 additive also shows capability in preventing Mn 2+ from degrading SEI on graphite surface. Such bulk and interphasial stability introduced by A12C4 leads to significantly improved cycling performance of LIBs.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Hong Ming,Yifei Zhao,Yayun Zhou,Shuai Zhang,Yuanjing Wang,Enhai Song,Zhiguo Xia,Qinyuan Zhang
Great efforts have been put in search of phosphors to fulfill the requirements for phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, a general organic–inorganic hybridization strategy was demonstrated in Mn4+-, Cr3+-, or Eu3+-doped guanidinium-based zero-dimensional hybrid fluorides to find phosphors for pc-WLEDs. Among which, GA3AlF6:Mn4+ (where GA represents the guanidinium cation [C(NH2)3]+) was selected to reveal their crystal structure, local symmetry, and luminescence properties. Density functional theory calculations suggested that GA3AlF6 with a wide band gap (∼5.24 eV) and the Fi′ interstitials are generated to balance the charge differences caused by non-equivalent doping. The GA3AlF6:Mn4+ hybrid could sustain ∼573 K high temperature without degradation and keep 90.1% of the original luminescence intensity at ∼373 K. A pc-WLED with wide color gamut (108.3%) of National Television System Committee standard was fabricated with GA3AlF6:Mn4+, suggesting its potential in high-quality backlight displays. This work not only brings a brand-new kind of organic–inorganic fluoride phosphor family but also provides great guiding significance for future exploration of fluoride-based functional materials containing a hybrid structure.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
Biomaterials Science
·
2019
·Vol. 8
·期 2
·712-719
·
IF 5.251
Yan Wu,Li Xu,Jiwen Qian,Leilei Shi,Yue Su,Youfu Wang,Dawei Li,Xinyuan Zhu
Theranostic nanoplatforms based on magnetic resonance imaging (MRI) technology have drawn much attention due to their inherent advantages such as non-invasiveness and high spatial resolution, but their construction is usually complicated and the compositions are uncontrollable. Herein, a simple and controllable theranostic nanoplatform by replacing a chelating agent with a chemotherapeutic drug directly was proposed. In detail, we elaborately synthesized Mn2+ and methotrexate (MTX) based nanoscale coordination polymers (NCPs) coated with poly(ethylene glycol) (PEG), MTX-Mn@PEG, in which Mn2+ ions served as MRI contrast agents (CAs), MTX was used as a chemotherapy drug and PEG provided a stable environment for nanoparticles, respectively. The obtained MTX-Mn@PEG NCPs showed a relatively uniform size, a pH-responsive feature and long blood circulation to enrich in the tumor location through the enhanced permeability and retention (EPR) effect. We determined the composition and coordination mechanism of MTX-Mn@PEG through thermogravimetric analysis (TGA), Fourier transform infrared (FI-TR) spectroscopy, powder X-ray diffraction (XRD) and so on. We determined the composition and coordination mechanism of MTX-Mn@PEG with the molar ratio of MTX to Mn2+ as 1 : 1. Then we confirmed that the antitumor ability was mediated by MTX through MTT and cell apoptosis assay in vitro. In vivo MR imaging and antitumor assays demonstrated the excellent effect of the NCPs in diagnosis and therapy of tumors. Overall, these novel MTX-Mn@PEG NCPs provide a theranostic nanoplatform for cancer treatment.
研究领域:
医学影像学
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肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Zhao Yubin,Xie Cong,Song Yuxiang,Yang Ping
The photoluminescence (PL) of doped ions is depended strongly on the position of the ion in the substrate. Ion doping endows semiconductor nanocrystals with novel properties. In this paper, Mn:CsPb(Cl/Br) 3 nanocrystals (NCs) with different halogen ratios were obtained by one-pot hot injection synthesis and halogen ion exchange. The emission of Mn 2+ from 4 T 1g - 6 A 1g d-d transition was observed in the case of changing the molar ratio of Cl/Br for Mn:CsPb(Cl/Br) 3 NCs. In the case of a Cl/Br ratio of 4/1, the PL peak of perovskite became weak and Mn 2+ emission was enhanced. After I − ion exchange, the emission of Mn 2+ was observed in Mn:CsPb(Cl/Br) 3 with Cl/Br ratio of 1/4, in which the PL efficiency of the nanocrystals reached 55.74%. Thus, Cl − ions increase the band gap and effectively promote the emission of Mn 2+ . At the same time, the morphology of the samples after ion exchange always remains cube. The lifetimes of the nanocrystals were short aged with increasing Cl − ions and prolonged with increasing I − ions. Because these Mn:CsPbX 3 (x = Cl, Br, I) NCs with different halogen ratios revealed highly stabile blue to red emission, the nanocrystals would be utilizable for further applications.
Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 5
·5094-5110
·
IF 2.914
Zhang Mengjiao,Zhu Liyun,He Changhua,Xu Xiaojun,Duan Zhengyang,Liu Shuli,Song Mingyao,Song Shumin,Shi Jiemei,Li Yu’e,Cao Guangzhu
In this study, the novel adsorbent PVA-TA-βCD was synthesized via thermal cross-linking between polyvinyl alcohol and β-cyclodextrin. The characterization methods SEM-EDS, FTIR, and XPS were adopted to characterize the adsorbent. The effect of pH, contact time, initial concentrations, and temperature during the adsorption of Pb(II), Cd(II), and Mn(II) onto the PVA-TA-βCD was also investigated. In a single-component system, the data fitted well to pseudo-second-order, and film diffusion and intra-particle diffusion both played important roles in the adsorption process. As for isotherm study, it showed a heterogeneous adsorption capacity of 199.11, 116.52, and 90.28 mg g −1 for the Pb(II), Cd(II), and Mn(II), respectively. Competition between the ions existed in a multi-component system; however, owing to the stronger affinity of the PVA-TA-βCD for Pb(II) relative to Cd(II) and Mn(II), the Pb(II) adsorption onto the PVA-TA-βCD was less affected by the addition of the other metals, which could be effectively explained by the hard and soft acid and base theory (HSAB). Furthermore, PVA-TA-βCD showed good reusability throughout regeneration experiments.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Jian Lin,Dan-Dan Hu,Qian Zhang,Dong-Sheng Li,Tao Wu,Xianhui Bu,Pingyun Feng
Solid-state red phosphors of Mn2+-doped nanocrystals usually suffer from poor intensity. While the d–d emission of Mn2+ in yellow window has been extensively studied, shift toward lower energy remains challenging. Typically, intrinsic surface defects and self-purification of dopants are two obstacles for enhancing the intensity of red emission. Moreover, for red phosphors Mn2+ ions also need an appropriate host matrix and environment. Through an in situ doping strategy and optimization of the Mn2+ doping level, intense red-emitting Mn2+ dopant emission is reported here for MnCdInS@InS host. The doping strategy allows doping of Mn2+ at the core and/or surface sites of supertetrahedral “core–shell” nanocluster (Mn@MnCdInS@InS), leading to the red emission (at 643 nm) with over 40% quantum yield. Moreover, systematic control of doping level results in a series of crystalline Mn2+-doped materials with tunable photoluminescence quantum yield. In addition to the synthesis of an important class of red-emitting materials rarely obtained from Mn2+ doping, details of the physical chemistry associated with the doping process are probed with the new fundamental findings reported here.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2022
·Vol. 17
·期 2
·e0264532
·
IF 3.752
Zhehua Xue,Lei Li
Controlling the manganese (Mn 2+ ) concentration is important to product quality in the electrolytic manganese industry. Conventional methods for detecting Mn 2+ are complex and reagent-consuming, which makes them slow and polluting. It is of great significance to develop a new fast and environmentally friendly method to quantify Mn 2+ in electrolyte. The characteristic ultraviolet-visible (UV-vis) absorbance at 401 nm of Mn 2+ will vary linearly with the Mn 2+ concentration after data correction. Adjusting the pH, calibrating the spectral bandwidth (SBW) and optical path length (OPL), and subtracting the interference from coexisting substances by linear interpolation improve the measuring accuracy. Mn 2+ concentration can be determined by direct fast UV-vis absorbance measurement at characteristic peaks without using harmful reagents which facilitates such measurement to be applicated as on-line detection method for electrolytic manganese industry. The method developed in this study will help achieve the goal of improving the detection speed while cutting back on pollutant discharge from concentration analysis process in electrolytic manganese industry.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Mingxun Han,Fanji Liu,Xiangxiang Li,Xiqing Zhang,Yiren Lu,Yanjun Lin,Lihong Zhang
A series of manganese-based catalysts supported on γ-Al 2 O 3 with low loading amount of manganese from 0.5% to 2.0% were prepared by incipient impregnating method. All catalysts were tested on non-oxidative dehydrogenation of isobutane at 600 °C. In order to explore physicochemical properties of all catalysts, various characterizations including XRD, H 2 -TPR, XPS, UV-vis, NH 3 -TPD and TG were carried out on manganese-based catalysts. The experimental results indicated that MnO x species were highly dispersed on γ-Al 2 O 3 support, and both Mn 2+ and Mn 3+ ions are main active species for isobutane dehydrogenation. The reduced catalyst 1.5%Mn/ γ -Al 2 O 3 exhibited the most optimal dehydrogenation performance among all catalysts, reaching at isobutane conversion of 36% and isobutene selectivity of 79%. The main reasons for the excellent activity and selectivity of 1.5%Mn/ γ -Al 2 O 3 were related to the high proportion of low valence manganese ions including Mn 2+ and Mn 3+ as well as the high concentration of medium strong acid sites and weak strong acid strength.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2023
·Vol. 55
·期 11
·1-15
·
IF 3
Li Xin,He Yu,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing
The Er 3+ , Yb 3+ and Mn 2+ co-doped perovskite NaMgF 3 submicron particles have been successfully fabricated and the related upconversion (UC) emission was investigated in this paper. The UC emission spectra confirm that the emission color of the Er 3+ ions can be modulated by the doping of the Mn 2+ ions, the incident laser power and the laser pulse-width. The UC emission results demonstrate that the key factor to modulate the UC emission color of the Er 3+ ions is the Mn 2+ ions in the submicron particles, in which the NaMgF 3 submicron particles have the largest relative green emission bands with the 3% Mn 2+ concentration. The experimental results also confirm that the UC intensities ratio of the green to the red emission will increase with the increase of the incident laser power and the decrease of the laser pulse-width. All the UC emission results imply that there are two energy transfer paths from the Mn 2+ state 4 T 1 to the Er 3+ ions, in which the transfer rate to the state 4 S 3/2 is far larger than the transfer rate to the state 2 H 11/2 and the energy transfer mechanism may related with the special structure of the Mn 2+ ions and the phonon-assisted processes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yong Liu,Shuai Cheng,Shengchun Yang,Zongtao Li,Zhenjuan Duan,Zhanjiang Hu,Zhengui Li,Yuehua Li,Lili Yu,Anzhong Peng,Xiaodong Wen
A series of Mn 4+ doped cubic phase Cs 2 KInF 6 red phosphors (abbreviated here as CKIFM) were obtained through a typical co-precipitation route. The optical and structural properties of this material were researched in more detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and photoluminescence excitation (PLE), diffuse reflectance spectroscopy (DRS), temperature-dependent PL and lifetimes. Interestingly, the as-prepared CKIFM phosphors have a strong and broad absorption band in the blue area with a peak at 468 nm, and bright narrow-band red fluorescence with high colour purity. Furthermore, the optimum quenching concentration, crystal field parameters (CFPs), internal quantum efficiency (IQE), and the corresponding concentration quenching mechanism are discussed and analyzed in detail. Finally, the WLED backlight using the obtained CKIFM red-emitting phosphor and β-SiAlON:Eu 2+ (β-Sialon:Eu 2+ ) green-emitting phosphor demonstrates a wide color gamut (∼101.7% National Television System Committee standard (NTSC)), revealing the title phosphor is an attractive red component for backlight displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Wei Yan,Xiaohan Yun,Hang Yang,Yi Wei,Guogang Li
Nowadays, non-rare-earth Mn 4+ -activated red phosphors have emerged for improvement of the lighting quality of phosphor-converted white light-emitting-diodes (pc-WLED), owing to the low cost and the admirable luminescence properties. In this work, a novel narrow-band red-emitting Li 3 CsGe 8 O 18 :Mn 4+ phosphor was synthetized based on the component substitution from Li 3 RbGe 8 O 18 , which exhibits the red luminescence centered at 668 nm upon 466 nm excitation. By further designing [Cs + -Rb + ] cation substitution, the photoluminescence intensity and luminescence efficiency are obviously improved. The photoluminescence intensity enhanced 1.75 times than Li 3 RbGe 8 O 18 :Mn 4+ phosphor, while the corresponding internal quantum efficiency (IQE) increased by 1.57 times. According to the Rietveld refinement results, the corresponding mechanism of luminescence enhancement is attributed to the smaller distortion degree of the [Ge(1)O 6 ] octahedron . The pc-WLED device is fabricated by the optimal Li 3 Cs 0.5 Rb 0.5 Ge 8 O 18 :1%Mn 4+ red phosphor, yellow phosphor with Y 3 Al 5 O 12 :Ce 3+ and 460 nm InGaN chip, showing a warm white light emission with low correlated color temperature (4474K) and high color rendering index (90.8). The result implies that the Li 3 Cs 0.5 Rb 0.5 Ge 8 O 18 :1%Mn 4+ phosphor can be used as a potential red phosphor for pc-WLED application.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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