Materials
·
2024
·Vol. 17
·期 18
·4459
·
IF 3.1
Zhi Wu,Huidong Tang,Tianhao Dai,Yuxi Long,Dan Luo,Pengcheng Jiang,Xin Xiong,Yanqiao Xu,Xiaojun Zhang,Qing Hu
Lead-free Mn2+-based metal halide materials are now being considered as clean candidates for backlight displays and lights due to the d–d transition, diverse components, and environmental friendliness. Therefore, efficient and stable Mn2+-based metal halide phosphors are in great demand for practical applications. In this work, adopting the mixed-ligand strategy, a series of [(CH3)4N]2−x[(C2H5)4N]xMnCl4phosphors were synthesized by mechanochemical process. With the increase molar ratio of (CH3)4N/(C2H5)4N, the phase of phosphors is transformed from orthorhombic to tetragonal. Compared to [(CH3)4N]2MnCl4and [(C2H5)4N]2MnCl4phosphors, the mixed-ligand strategy significantly boosts the green emission intensity of Mn2+-based metal halide phosphors. The obtained [(CH3)4N][(C2H5)4N]MnCl4phosphors exhibit a high photoluminescence quantum yield (PLQY) of 83.78% under 450 nm excitation, which is attributed to the modulation of the adjacent [MnCl4]2- distance by using the different chain length of organic cations, effectively suppressing non-radiative recombination. Additionally, the [(CH3)4N][(C2H5)4N]MnCl4phosphors exhibit a green emission at 516 nm, narrow full width at half-maximum (FWHM) of 45.53 nm, and good thermal stability. The constructed white light-emitting diode (WLED) device exhibits a wide color gamut of 108.3% National Television System Committee, demonstrating the suitability of the [(CH3)4N][(C2H5)4N]MnCl4phosphors as a green emitter for WLED displays and lightings. This work provides a new way to modulate the PL performance of manganese-based metal halides for application in the optoelectronic field.
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Advanced NanoBiomed Research
·
2024
·
IF 4
Yile Zheng,Yi Wei,Yuying Yang,Xiang Wen,Cai Yang,Yating Xiao,Zhen Du,Xiangsheng Liu
Photoactivatable carbon monoxide-releasing molecules (CORMs), typically based on transition-metal carbonyl complexes, have reliance on activation by UV or visible light that restricts their biomedical applications. To address this limitation, a near-infrared (NIR)-responsive nanoplatform is presented based on upconversion nanoparticles (UCNPs) loading with manganese carbonyl complex Mn 2 (CO) 10 that concurrently releases CO and manganese ion (Mn 2+ ). With the UCNPs, the more tissue-penetrable NIR is used to locally generate UV light for photodecomposition of Mn 2 (CO) 10 into CO and manganese oxide (MnO X ), after which MnO X is reduced to Mn 2+ by the overexpressed glutathione in cancer cells. Moreover, the released Mn 2+ can serve as a magnetic resonance imaging contrast agent to monitor the NIR-controlled corelease of CO and Mn 2+ in real time. Therefore, this nanoplatform can provide a potential strategy for NIR-enabled spatiotemporally release of CO and Mn 2+ , enhancing the controlled delivery and biomedical application of CORMs.
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MATERIALS LETTERS
·
2025
·
IF 2.7
Yiyong Chen,Qianyi He,Yuyao Yang,Shaolin Lu
Organic-inorganic hybrid perovskites are promising for optical encryption and anti-counterfeiting due to their tunable optoelectronic properties. However, conventional monochromatic photoluminescence systems are vulnerable to spectral decryption. This study proposes a universal strategy for synergistic anti-counterfeiting by fabricating (MTP) 2 MnBr 4 composites via solid-state melt processing. The controlled Mn 2+ doping (1–3 mol%) creates a dual-emission system with excitation-dependent colour modulation from green (520 nm) to red (620 nm) through selective activation pathways. The composites are processable into transparent bulk materials and printable inks, enabling multiscale anti-counterfeiting in currency, pharmaceuticals, and luxury packaging. This approach combines accessible materials with scalable protocols, offering a practical route for industrial security applications.
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Advanced Optical Materials
·
2024
·
IF 8
Liling Fei,Lin Yang,Peng Li,Jiangang Ma
Mn 2+ doped CsPbCl 3 nanocrystals (Mn 2+ :CsPbCl 3 NCs) show immense promise in lighting and display technologies owing to their outstanding optical characteristics. Nonetheless, high defect density, inefficient Mn 2+ doping, and poor structural robustness pose considerable challenges in the synthesis of Mn 2+ :CsPbCl 3 NCs with high photoluminescence quantum yield (PLQY) and long-term stability. This study introduces an eco-friendly room-temperature post-treatment method utilizing MgCl 2 /oleylamine solution, boosting the total PLQY of the NCs from 65% to 98%, including a 30% increase for Mn 2+ emission. Additionally, the post-treatment significantly improves the NCs’ resilience against UV light, retaining 80% of their initial PL intensity after 120 hours of UV exposure. Comprehensive analyses including density functional theory simulation and temperature-dependent PL spectra suggested that the PLQY enhancement is due to the improved Mn 2+ doping efficiency and the effective passivation of native vacancy defects. The stability of the NCs is enhanced by replacing Pb 2+ with Mg 2+ and Mn 2+ , mitigating lattice distortions within the [PbCl 6 ] 4− octahedral framework. The color rendering index of white light-emitting diodes fabricated with the post-treated Mn 2+ :CsPbCl 3 NCs achieves an exceptional value of 98. This work offers novel insights into the fabrication of high-PLQY Mn 2+ :CsPbCl 3 NCs, advancing the practical deployment of perovskite nanomaterials in various industries.
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Advanced Healthcare Materials
·
2024
·
IF 10
Shuangqing Liu,Liya Tian,Mengyao Mu,Ziyan Liu,Mengzhen Dong,Yufang Gong,Hui Liu,Ximing Wang,Qingwei Meng,Haidong Zhang,Xiao Sun
Nanoplatforms with high Mn 2+ coordination can display efficient T 1 magnetic resonance imaging (MRI) contrast enhancement. Herein, we firstly proposed an earth gravity-like method for enhanced interaction between Ferritin (Fn) and Mn 2+ by the growth of platinum nanoparticles (PNs) in Fn's cage structure via a biomineralization method. Fn has good biocompatibility and can provide a suitable growth site for PNs. PNs with negative charge have certain attraction to Mn 2+ with positive charge, improving Fn's loading capacity of Mn 2+ by attraction force and thus achieving efficient MRI contrast enhancement. In addition, PNs can be applied for efficient photothermal therapy (PTT) under near infrared ray (NIR) irradiation. Systemic delivery of this nanoplatform showed obvious MRI contrast enhancement and tumor progression inhibition after NIR irradiation, as well as no obvious side effects. Therefore, this nanoplatform has the potential to contribute to nanotheranostic for clinical transformation. This article is protected by copyright. All rights reserved
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Junwei Zhang,Hui Lin,Shuo Zhu,Yuetong Zhen,Ruijin Hong,Zhaoxia Han,Dawei Zhang
The rapid advancement of high-power solid-state lighting highlights the importance of developing phosphor ceramics with high resistance to thermal quenching of its luminescence. Herein, a series of Eu 2+ co-doping MgAl 2 O 4 : Mn 2+ phosphor ceramics were synthesized by spark plasma sintering. The significant green light enhancement at 516 nm is attributed to Eu 2+ -Mn 2+ energy transfer. The introduction of Eu 2+ increases the concentration of electron trap levels and improve the luminescence intensity at 423 K from 80% to 110%, compared with the counterparts at room temperature. The strong correlation between trap levels and oxygen vacancies was demonstrated by the X-ray photoelectron spectroscopy and electron paramagnetic resonance analysis. Finally, the application demonstration of the optimized sample was explored through its integration with a 400 nm LED chip. This study proposes a strategy of leveraging trap levels to induce anti-thermal quenching behavior, providing some insights for the development of highly thermally stable phosphor ceramics.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yao Xiao,Puxian Xiong,Shuai Zhang,Kang Chen,Shuhang Tian,Yongsheng Sun,Peishan Shao,Kexin Qin,Mikhail G. Brik,Shi Ye,Dongdan Chen,Zhongmin Yang
Developing deep-red to near infrared (NIR) materials with multi-mode luminescence is challenging, which has promising utilization in various applications such as stress sensing and dynamic signature anti-counterfeiting. Different to the mainstream non-centrosymmetric mechanoluminescence (ML), a centrosymmetric perovskite compound (MgGeO 3 : Mn 2+ ) ML material is reported. Deep-red to NIR light (600–800 nm) from Mn 2+ ion is confirmed, which is attributed to the strong crystal field within the [MgO 6 ] polyhedron. The stiffness tetrahedral units and large defect accommodating space within the host are favorable for both ML and persistent luminescence (PersL). Mn 2+ ion is the only luminescent center, which is confirmed by spectral characterizations. Based on diffuse reflectance spectra, thermoluminescence analysis and density functional theory calculations, the inherent relationship between PersL, ML and PL is further clarified in detail. Due to the formation of Mn Mg defects, shallow trap significantly become shallower after adding Mn 2+ ions. This study reports a Mn 2+ -doped deep-red to NIR ML phosphor, and further describes the PersL and ML mechanisms via defect engineering regulation. In general, this study may also open up a new approach for the development of efficient NIR ML materials, and show various potential applications such as in anti-counterfeiting and information encryption fields.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kuixin Cui,Aili Zhou,Caihong Yu,Shengming Jin
The unavoidable Mn 2+ ions in pulp were considered in the flotation of rhodochrosite, and its effect and relative interaction mechanism on the floatability of calcite served as a typical gangue mineral were investigated through microflotation tests, zeta potential measurements, SEM-EDS detection, solution chemistry calculation, adsorption experiments, FTIR and XPS analyses. There exhibited a good separation performance of rhodochrosite against calcite with OHA collector, but in the presence of Mn 2+ ions, the floatability of calcite was closed to rhodochrosite within a pH of 8.0–10.0, which resulted in the separation difficulty between them. As evidenced, the surface of calcite could be modified by Mn 2+ ions, its isoelectric point shifted positively from 8.91 to 10.06, and Mn 2+ species detected on calcite surfaces were in close proximity to rhodochrosite. It indicated that MnCO 3 precipitates were generated on the surface of calcite. After modified by Mn 2+ , the calcite surface became more active and obviously increased the adsorption amount of OHA. It was verified from zeta potential and XPS analyses that Mn species on the surface of calcite were active sites for OHA adsorption, likely the hydroxamate group of OHA collector chelated with Mn species to form hydrophobic compounds. As a result, Mn 2+ ions in pulp would reduce the flotation selectivity of rhodochrosite from calcite, thus it is necessary to eliminate the disadvantage of Mn 2+ for strengthening flotation.
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Journal of Energy Storage
·
2025
·
IF 9.8
Yong Tang,Jianwei Zhao,Yi Li,Yujing Wang,Guangqiu Zhang,Yihang Zhao,Lirong Qin
In this study, we synthesized Co 3 O 4 :Ce 3+ /Mn 2+ granular nanowires on nickel foam as an electrode for supercapacitors using a hydrothermal method. The introduction of Mn 2+ ions into the Co 3 O 4 :Ce 3+ electrode material increased the oxygen vacancy and Co 2+ /Co 3+ ratio of the material, resulting in an increase in electrical conductivity and electrochemical performance. In the three-electrode system, the Co 3 O 4 :Ce 3+ /Mn 2+ electrode achieved a specific capacitance of 2527.8 F/g at 1 A/g, which is 65 % higher than that without Mn 2+ ions. A symmetric supercapacitor (SSC) device was prepared by assembling two electrode components. At a current density of 1 A/g, the SSC device achieved a specific capacitance of 467.0 F/g, delivering a maximum energy density of 233.5 Wh/kg (1 A/g) and a maximum power density of 36,600 W/kg (20 A/g), coupled with outstanding cycling stability. These results indicate that the Co 3 O 4 :Ce 3+ /Mn 2+ nanowires coated nickel foam electrode holds considerable promise for applications in energy storage.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Dayu Huang,Yuhang Zhang,Yingsheng Wang,Zixun Zeng,Xiaokai Feng,Ziwei Zhang,Guolong Wu,Dongjie Liu,Zheyu Zhang,Ziyong Cheng,Hongzhou Lian,Jun Lin
Single-crystalline (HPPh3)2MnCl4 was synthesized via antisolvent vapor diffusion. The compound crystallizes in the monoclinic P21/n space group and features a distorted tetrahedral [MnCl4P] core with Mn–Cl bond lengths of 2.3 Å and Cl–Mn–Cl bond angles ranging from 104–116°. Narrowband green emission (516 nm, full width at half-maximum (fwhm) = 47 nm, photoluminescence quantum yield (PLQY) = 49%) is achieved due to suppressed Jahn–Teller distortion, which results from the structural rigidity imparted by interligand π-π stacking and C–H···Cl hydrogen bonds. Spectroscopic and theoretical analyses confirm that the luminescence is dominated by the crystal field (10Dq = 8723 cm–1). Furthermore, spin-phonon engineering drives an anomalous thermal response, characterized by a thermally activated delayed fluorescence (TADF)-mediated intensity enhancement between −50 and 75 °C (4T1–2E gap <1500 cm– 1) and Jahn–Teller quenching with an activation energy of 0.36 eV. For radiation detection, the crystal achieves record light yield (47950 photons/MeV) and ultralow detection limit (0.25 μGy·s–1). A 150 μm flexible scintillator screen demonstrates real-time X-ray imagingat clinical dose rates (1 μGy·s–1). This work establishes supramolecularly engineered Mn2+ phosphors as the next-generation scintillators.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoling Zhou,Zhuodong Li,Ou Xu,Shengji Yuan,Tao Huang,Bingsuo Zou
Lead-free metal halide perovskites have attracted considerable interest due to their excellent optical properties and environmental friendliness. However, their practical application is often hindered by a low photoluminescence quantum yield (PLQY). Herein, we report a novel Cd2+/Mn2+ codoped CsCaCl3 perovskite crystal that achieves a record-breaking PLQY of 93%, which is realized through a novel energy transfer pathway. By varying the Mn2+ doping concentration in CsCaCl3:4%Cd2+, the crystal’s emission color can be tuned from cyan to yellow across the 400–700 nm wavelength range. Interestingly, the material also exhibits a distinct hydrochromic behavior. Upon humid air exposure, it undergoes a structural transformation from CsCaCl3:Cd2+/Mn2+ to Cs2CaCl4·2H2O:Cd2+/Mn2+, accompanied by a dramatic emission color shift from yellow to orange. This process exhibits excellent reversibility over multiple wetting–drying cycles. The combination of ultrahigh PLQY, tunable luminescence, and stimuli-responsive hydrochromism makes this material highly promising for advanced applications in dynamic information encryption and anticounterfeiting. Moreover, the CsCaCl3:4%Cd2+/3%Mn2+ crystal exhibits tunable energy-transfer emission under different temperatures, achieving a high relative thermal sensitivity of 5.48%·K–1, demonstrating its potential for optical thermometry.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·77536-77552
·
IF 5.19
Xue Yun,Cheng Wanting,Cao Meng,Gao Jianzhang,Chen Jiaqi,Gui Yunyang,Zhu Wenmin,Ma Fuqiu
In this paper, nitric acid-modified activated carbon was used as an electrode in the electrosorption process for the removal of Co 2+ , Mn 2+ , and Ni 2+ from wastewater. The effects of applied voltage, initial pH, and coexisting ions on removal efficiency were investigated. The adsorption process was evaluated by adsorption isotherm models. The results indicated that the electrosorption process was consistent with the Langmuir model, proving that the electrosorption process was a monolayer adsorption process. The maximum adsorption capacities of Co 2+ , Mn 2+ , and Ni 2+ were 131.58 mg/g, 102.04 mg/g, and 103.09 mg/g. Electrochemical tests revealed that the specific capacitance of AC-HNO 3 was 54.11 F/g when the scanning rate was 5 mV/s, while the specific capacitance of AC was 36.51 F/g. The Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) confirmed that the content of oxygen groups on the surface of activated carbon increased after modification, which provided more adsorption sites for electrosorption. When the selected concentration of HCl was used as the eluent, the elution efficiency of Co 2+ , Mn 2+ , and Ni 2+ could reach 94.23%, 93.65%, and 90.61%. The removal efficiency could reach more than 95% after three cycles. The results of the study can be used as a reference significance for the removal of cobalt, manganese, and nickel ions from heavy metal wastewater by electrosorption.
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