CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shuo Wang,Shimin Liu,Jingyi He,Jiangwei Liang,Tianlin Chen,Xuemei Fan,Shiqing Xu
Spectroscopic screening of Mn:CsPbX 3 (X = Cl, Br, I) nanocrystals embedded in a B–Si–Zn–Al glass matrix identifies CsPbCl 3 as a suitable sensitizing host for Mn 2+ emission because of its favorable energy-level alignment. However, achieving efficient Mn 2+ luminescence in CsPbCl 3 -based microcrystalline glass remains challenging due to the intrinsically weak spin-forbidden d–d excitation of Mn 2+ and the difficulty of precipitating CsPbCl 3 nanocrystals within a rigid glass network. In this work, Mn 2+ incorporation is proposed as an effective strategy to facilitate the local crystallization of CsPbCl 3 nanocrystals, as supported by HRTEM lattice-fringe observations, XPS analysis, and photoluminescence evolution. Combined with non-equilibrium kinetic control, rapid water quenching helps preserve a larger population of small and dispersed Mn:CsPbCl 3 luminescent units, thereby enhancing the macroscopic orange-red emission. The corresponding spectral behavior is consistent with host-mediated sensitization of Mn 2+ . Compared with thermodynamic annealing, which improves intrinsic radiative efficiency through structural relaxation and defect reduction, the water-quenched sample exhibits stronger steady-state photoluminescence despite a lower absolute quantum efficiency. This contrast indicates that the enhanced brightness mainly originates from the increased population of active sensitized Mn 2+ -emitting centers rather than from improved intrinsic efficiency of individual centers. These results suggest that coupling Mn 2+ -assisted local crystallization with non-equilibrium water-quenching control provides a feasible route for designing high-brightness orange-red luminescent microcrystalline glasses.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12164-12172
·
IF 7.059
Xinxin Han,Enhai Song,Shuai Zhang,Shi Ye,Xiao-Bao Yang,Qinyuan Zhang
Mn2+ ions-activated phosphors play a crucial role in modern lighting and display due to their typical tunable single-band visible (VIS) emission characteristics. Herein, besides the conventional VIS emission, a near-infrared (NIR) emission centered at ∼780 nm is presented in heavy Mn2+-doped fluoride RbZnF3:Yb3+,Mn2+ designed by the dopant-distribution prediction simulation. On varying the dopant (Mn2+) concentration, the single-band VIS emission to VIS/NIR dual emission and then to pure NIR photon upconversion (UC) emission was achieved in RbZnF3:Yb3+,Mn2+. The density functional theory (DFT) calculations, static and dynamic luminescence analysis, as well as the extended-X-ray absorption fine structure (EXAFS) characterization strongly confirmed that the NIR emission of the Mn2+ was from the Mn2+–Mn2+ dimer induced by Mn2+ ions aggregation in RbZnF3. Further, a ground-state absorption (GSA)/excited state absorption (ESA) NIR UC luminescence mechanism based on the Yb3+–Mn2+–Mn2+ trimer model is proposed. This work provides a new strategy for realizing single-band NIR photon UC emission, and also provides new insights into the rational design of the Mn2+ VIS/NIR emission via dopant-distribution prediction.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 4
·1-10
·
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
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高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Xintong Li,Yongna Guo,Xin Ma,Chao Zhang,Jia Yang,Shuai Wang
Herein, a series of α -hydroxyalkyl phosphinic acids were designed and first introduced in Mn 2+ extraction and Mn 2+ -Mg 2+ separation. The extraction tests indicate that the α -hydroxy-2-ethylhexyl phosphinic acid ( α -H-2-EHA) possesses superior extraction ability compared to di-2-ethylhexyl phosphinic acid (P204) for Mn 2+ and Mg 2+ , and the partition coefficient ( β ) is 28.2 at a saponification ratio of 30%. The results of quantum chemical calculation, FT-IR spectrum and slope analysis method reveal that the α -H-2-EHA can form stable four-membered ring structure with metal ions during the extraction process through P–OH and P O bonds. Furthermore, the HOMO composition results suggest that α -OH might also promote the interaction between extractant and metal ions. Finally, a three-stage countercurrent extraction—washing—stripping process was proposed and Mn 2+ can be enriched from 11.2 g/L to 36.6 g/L, with Mg 2+ decreased from 30.3 g/L to 0.6 g/L, which provides an efficient strategy for the preparation of high-purity manganese.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
J.L. Wang,E.H. Song,M. Wu,W.B. Dai,S. Ye,Q.Y. Zhang
Selectively enhanced green upconversion (UC) and near-infrared (NIR) downconversion (DC) emissions of Er 3+ by Yb 3+ -Mn 2+ dimer sensitizing have been demonstrated in Er 3+ /Yb 3+ /Mn 2+ tri-doped spinel MgGa 2 O 4 upon excitation of 980 nm laser diode (LD). By optimizing the doping rate of Mn 2+ , the intensity ratio of green to red UC emission intensities of Er 3+ (G/R) could be enhanced about 10 times. Meanwhile, the 1.5 μm NIR DC emission could also be increased about 3.6 times in this system. The DC and UC emission properties, UC mechanism, as well as the enhancing mechanism have been investigated and discussed in detail. A selectively enhancing mechanism based on Yb 3+ -Mn 2+ dimer sensitizing is proposed to explain the selectively enhancing phenomena. This work could inspire the design of novel UC materials for various applications, such as temperature sensors and optical transmission, etc.
研究领域:
光学材料
·
生物医学光子学
·
无机功能材料
·
分子影像
·
转化医学
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高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2014
·Vol. 239
·期 5
·827-835
·
IF 1.387
Wang Panxue,Li Aixia,Dong Mei,Fan Mingtao
The aim of this study was to purify a malolactic enzyme (MLE) from Oenococcus oeni ( O. oeni ) strain and determine its properties in detail. O. oeni SD-2a was cultivated in the ATB broth supplemented with 7 g/L l -malic acid for harvesting the cells. After harvest, the cells were washed and disrupted for purification of MLE. MLE was purified from the supernatant of the disrupted cells through protamine sulfate precipitation, anion exchange chromatography and gel filtration chromatography. The purified MLE was identified using mass spectrometry. The MLE was purified by 43-fold with a yield of 0.42 % and possessed a specific activity of 419.2 U/mg. The purified enzyme with a nominal molecular mass of 59 kDa and a theoretical p I of 4.76 exhibited a maximum enzyme activity at 35 °C and pH 6.0, which retained over 50 % of its initial activity in the presence of 14 % (v/v) ethanol. Mn 2+ was proven to be the most effective divalent cation to promote enzyme activity. Under the conditions of temperature 30 °C and pH 6.0, the K
m and V
max of MLE on l -malic acid were 12.5 × 10 −3 M and 43.86 μmol/(min × mg), respectively. Moreover, the purified enzyme exhibited a higher stability with 0.1 M NaCl in addition and had a half-life of 30 days at 4 °C.
研究领域:
微生物学
·
酶学
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高影响因子
Science Bulletin
·
2021
·Vol. 67
·期 7
·707-715
·
IF 11.78
Jingjing Ning,Yuantian Zheng,Yinti Ren,Leipeng Li,Xingqiang Shi,Dengfeng Peng,Yanmin Yang
Mechanoluminescent (ML) materials can directly convert external mechanical stimulation into light without the need for excitation from other forms of energy, such as light or electricity. This alluring characteristic makes ML materials potentially applicable in a wide range of areas, including dynamic imaging of force, advanced displays, information code, storage, and anti-counterfeiting encryption. However, current reproducible ML materials are restricted to sulfide- and oxide-based materials. In addition, most of the reported ML materials require pre-irradiation with ultraviolet (UV) lamps or other light sources, which seriously hinders their practical applications. Here, we report a novel ML material, MgF 2 :Mn 2+ , which emits bright red light under an external dynamic force without the need for pre-charging with UV light. The luminescence properties were systematically studied, and the piezophotonic application was demonstrated. More interestingly, unlike the well-known zinc sulfide ML complexes reported previously, a highly transparent ML film was successfully fabricated by incorporating MgF 2 :Mn 2+ into polydimethylsiloxane (PDMS) matrices. This film is expected to find applications in advanced flexible optoelectronics such as integrated piezophotonics, artificial skin, athletic analytics in sports science, among others.
研究领域:
材料科学
·
机械发光
·
光电子学
·
智能材料
·
传感器
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Fangrong Qin,Muhammad Amin Padhiar,Shusheng Pan,Noor Zamin Khan,Yongqiang Ji,Sayed Ali Khan,Jahangeer Ahmed,Shaolin Zhang
All inorganic perovskite nanocrystals (NCs) have emerged as versatile materials for gas sensing due to their tunable optical properties and high surface-to-volume ratios. However, CsPbCl3 has limitations when it comes to gas sensing. In this study, we explore the potential of Mn2+-doped CsPbCl3 NCs as a room-temperature sensing platform for ammonia (NH3) gas detection. By incorporating Mn2+ dopants into the CsPbCl3 lattice, we enhance the sensitivity of the NCs to NH3 gas. Additionally, NH3 molecules interact with the NCs, leading to the dynamic passivation of Cl– vacancies. We systematically investigate the sensing performance of Mn:CsPbCl3 NCs by using varying NH3 concentrations, different exposure conditions, and exposure cycles, revealing a reversible and concentration-dependent response. The sensor based on Mn2+-doped CsPbCl3 NCs has good selectivity for NH3 at room temperature, showing a higher sensitivity (2.12 at 100 ppm) than the pure CsPbCl3 NC sensor (1.10 at 100 ppm), and good repeatability. The unique optical properties of Mn:CsPbCl3 NCs, coupled with their responsiveness to NH3, make them promising candidates for developing efficient and cost-effective room-temperature NH3 gas sensors. This work contributes to the advancement of NC-based gas sensing technologies and highlights the potential of Mn-doped CsPbCl3 NCs in environmental monitoring, industrial safety, and other gas sensing applications.
研究领域:
材料科学
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传感器技术
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环境监测
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高影响因子
Materials
·
2020
·Vol. 13
·期 6
·1410
·
IF 3.057
Yi-Fei Zhu,Tong Jiang,Lei Li,Long-Xiang Cheng,Jun-Cheng Zhang
Trap-controlled mechanoluminescent (ML) materials characterized by reproducible mechanoluminescence (ML) after irradiation recharging have shown attractive prospects in applications including stress distribution visualization, stress-driven light sources, and anti-counterfeiting. However, these materials generally suffer from the difficulty of achieving non-decaying ML when subjected to continuous mechanical stimulation. Herein, we develop a trap-controlled reproducible ML material, Li2MgGeO4:Mn2+, and report its short-term non-decaying ML behavior. Investigation of trap properties suggests that the unique non-decaying ML behavior should arise from the deep traps existing in Li2MgGeO4:Mn2+, which provide electron replenishment for shallow traps that release small numbers of electrons during short-term cyclic friction. Our results are expected to provide a reference for the ultimate achievement of long-term non-decaying ML in such materials.Keywords:mechanoluminescence;traps;phosphors
研究领域:
材料科学
·
光学
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PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 7
·4763-4774
·
IF 4.186
Nanchuan Wang,Shibo Guo,Qiaochu Chen,Fengmei Gao,Weiyou Yang,Hui Fu,Jinju Zheng
The thermodynamically viable halogen vacancy defects in CsPbCl 3 perovskite nanocrystals (NCs) are considered the main factor in weakening their optical quality. However, their separate impact on the dopant emission in Mn 2+ -doped CsPbCl 3 perovskite NCs is still under exploration owing to the absence of comparable samples. Herein, a series of Mn 2+ -doped CsPbCl 3 samples were synthesized with different oleylamine-Cl (OAm-Cl) contents based on a halogen-hot-injection strategy. It is found that the Mn 2+ concentration of as-prepared samples fixed at 0.65%, and the Mn 2+ photoluminescence (PL) also exhibited an OAm-Cl content-independent lifetime of ∼ 1.78 ms, implying the efficient and identical luminescence of isolated Mn 2+ ion in all samples. In contrast, the excitonic and Mn 2+ PL intensities of the NCs are strong related to the amount of OAm-Cl, which are attributed to the coordination effect of the suppressed excitonic nonradiative recombination owing to the passivation of chloride vacancies and the enhanced energy transfer from the host exciton to Mn 2+ ions in the samples with sufficient OAm-Cl contents. The temperature-dependent of Mn 2+ PL disclosed an initial increase and was followed by a decrease with increasing temperature for the samples with relatively higher OAm-Cl contents, while it monotonously decreases for the sample with lower OAm-Cl content of 0.4 mL. The different PL intensity change trend results from the effective passivation of chloride vacancies by extra OAm-Cl. Above results present here will help clarify the underlying influence mechanism of halogen vacancy on the PL properties of Mn 2+ -doped perovskite NCs, which is essential for targeted modulation of their optical properties.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Advanced Optical Materials
·
2014
·Vol. 2
·期 7
·670-678
·
IF 0
Enhai Song,Sha Ding,Ming Wu,Shi Ye,Fen Xiao,Shifeng Zhou,Qinyuan Zhang
An anomalous near-infrared (NIR) upconversion (UC) emission band at approximately 770 nm is demonstrated in KZnF 3 :Yb 3+ ,Mn 2+ nanocrystals with heavy Mn 2+ doping. This band would enable advanced biological imaging with improved resolution and enhanced penetration depth. Careful studies based on structure analysis, excitation and emission spectra, and luminescence decay curves indicate that this unusual NIR emission (770 nm) originates from the 6 A 1g (S) 4 T 1g (G)→ 6 A 1g (S) 6 A 1g (S) transitions of the Mn 2+ –Mn 2+ dimers. The influence of Mn 2+ concentration and temperature on the Stokes and UC luminescence properties are also investigated. The proposed mechanism for the observed NIR UC emission involves ground state absorption and excited state absorption processes. The present results not only provide a useful and effective approach to achieving pure NIR UC emission, and also new insights into the development of advanced photonic devices and technologies.
研究领域:
材料科学
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光学
·
生物医学工程
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yuhui Zheng,Jiansheng Huo,Jinglian Yang,Jing Hu,Jinwei Gao,Qianming Wang
Uniform and dispersive NaLa(MoO 4 ) 2-x (WO 4 ) x (abbreviated as NLMW): Eu 3+ /Tb 3+ (5 mol%) microspheres were successfully synthesized at low temperature (393 K). The incorporation of Bi 3+ or Mn 2+ into CaMoO 4 : Eu 3+ with tetragonal crystalline phase has also been studied. The structure, morphology, and luminescent properties of these powder samples were examined by means of X-ray diffraction (abbreviated as XRD), scanning electron microscopy (abbreviated as SEM), and fluorescent spectrophotometry, respectively. SEM images substantiated that these phosphors have uniform sphere-shaped morphologies. The samples exhibited the characteristic emission of Eu 3+ ( 5 D 0 → 7 F J )/Tb 3+ ( 5 D 4 → 7 F J ) under ultraviolet excitation. Effects of the ratio of MoO 4 /WO 4 on the luminescence behavior were investigated in detail. The MoO 4 /WO 4 ratio was optimized as 1/1. The international commission on illumination (abbreviated CIE for its French name) chromaticity coordinates of NLMW: Eu 3+ and NLMW: Tb 3+ indicate the emissions were located in the red and green region, which will be beneficial for the potential device fabrication . Encapsulation of Bi 3+ and Mn 2+ both can effectively sensitize europium (III) ions, generating stronger red emissions ( 5 D 0 → 7 F J ).
研究领域:
材料科学
·
光学
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高影响因子
危险品化学品经营许可证（带存储）