Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 10
·3588-3595
·
IF 6.4
Jianxiong Lei,Wei Li,Yiqian Tang,Yiyu Cai,Shanshan Wang,Kunpeng Dou,Jun-Cheng Zhang
The development of lanthanide-activated CaZnOS mechanoluminescent (ML) phosphors that can produce non-pre-irradiated mechanoluminescence (ML) in the near-infrared (NIR) region opens a new avenue for in vivo and in situ biomechanical imaging. However, the progress in obtaining NIR ML images with a high signal-to-background ratio (SBR) has been constrained by the difficulties in achieving intense NIR ML. In this paper, we report a Mn2+-coactivation induced dual sensitization strategy that combines host sensitization with dopant sensitization to enhance the NIR ML of CaZnOS:Nd3+. Systematic characterization of the CaZnOS:Nd3+,Mn2+ series reveals that the enhanced NIR ML arises from the energy transfer from the host to Mn2+ to Nd3+, which involves the Mn2+-doping strengthened host excitation and the resonant energy transfer from Mn2+ to Nd3+. We demonstrate that the developed CaZnOS:Nd3+,Mn2+ phosphor greatly enhances the transient intensity of the NIR ML response and the SBR value of NIR ML images through a series of NIR ML penetration experiments on chicken breast and human cheek. In particular, the transient NIR ML response to dental occlusion is improved by 368%, while the SBR value of NIR ML penetrating the human cheek is improved from 1.25 to 2.1. Our results are expected to provide new insights into the development and optimization of non-pre-irradiated NIR ML phosphors, and further to advance the applications of NIR ML phosphors with an intense emission for high SBR biomechanical imaging.
研究领域:
材料科学
·
光学材料
·
生物医学成像
·
发光材料
·
力学传感
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高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Zishuo Yi,Weiling Huang,Yan Xu
Dual-emitting ratiometric optical thermometers with the advantages of excellent self-calibration and high-sensitivity have become a research hot spot. Herein, a dual-emissive 4-methylumbelliferone encapsulated ZIF-8 (ZIF-8⊃4-MU) modified Zn 2 GeO 4 :Mn 2+ nanocomposite was simply prepared by adding Zn 2 GeO 4 :Mn 2+ nanorods into a methanol solution containing 4-methylumbelliferone (4-MU), zinc (II) nitrate hexahydrate, and 2-methylimidazole. Accompanying with the self-assembly of ZIF-8⊃4-MU, the binding affinity of Zn 2+ ions to the surface of Zn 2 GeO 4 :Mn 2+ nanorods enables the formation of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ nanocomposite. The photoluminescence violet-blue (420 nm) and green emissions (531 nm) of the nanocomposite can be ascribed to the two independent luminescent centers of 4-MU dyes confined in ZIF-8 and the characteristic transition of 4 T 1 - 6 A 1 for Mn 2+ ions doped in Zn 2 GeO 4 , respectively. The fluorescent intensity ratios (FIRs) of 4-MU to Mn 2+ (I 420 nm /I 531 nm ) showed excellent self-calibrating temperature monitoring functions with a maximum relative sensitivity (S r ) of 1.82%· o C −1 and stable reusability in the temperature range of 20–100 °C. Also, the ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ hybridized polyvinyl alcohol (PVA) transparent film showed a similar multi-emitting behavior, as well as good processability and tensile properties . Benefiting from the excitation-dependent emitting property of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ , a multiple optical encryption of digital information was successfully realized based on a two-dimensional code, achieving an enhanced security level for preventing counterfeiting. This proof-of-concept study offers a feasible assembled way in fabricating multi-mode luminescent nanocomposites for ratiometric temperature sensing and information encryption .
研究领域:
材料科学
·
光学
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·148
·
IF 36.3
Yang Zefang,Zhang Qi,Hu Chao,Tang Yougen,Li Jinchi,Wang Qi,Zhou Wanhai,Chao Dongliang,Wang Haiyan
A semisolid MnO 2 slurry electrode enables reversible MnO 2 deposition/dissolution within a CNT-percolated conductive network, achieving a high areal capacity of 60 mAh cm −2
The slurry system promotes the formation of highly conductive γ-MnO 2 and achieves uniform MnO 2 dissolution through enhanced charge transfer.
The MnO 2 slurry electrode offers strong scalability and regenerability, retaining 100% capacity after 180 cycles and reactivating inactive MnO 2 via percolation.
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JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.4
Wang Zhihui,Wang Xiaohua,Jia Yumeng,Wang Jing,Shi Zhongxiang,Yan Qingyun
A narrow-band green-emitting phosphor KAl 11 O 17 (KAO): Eu 2+ , Mn 2+ , was synthesized via a high-temperature solid-state reaction to evaluate its potential for use in high-quality backlight displays. Structural refinement reveals that Eu 2+ and Mn 2+ ions preferentially occupy distinct crystallographic sites: Eu 2+ resides at K + sites in the conductive layer, whereas Mn 2+ substitutes for tetrahedral Al 3+ sites within the spinel block. This spatial separation facilitates efficient energy transfer (ET) from Eu 2+ to Mn 2+ . Spectroscopic analysis of the optimally doped composition, KAO: 0.07Eu 2+ , 0.04Mn 2+ , indicates that the ET proceeds predominantly via a dipole - quadrupole ( d - q ) mechanism. The resulting phosphor exhibits bright green emission centered at 510 nm with an exceptionally narrow full width at half maximum (FWHM) of 8.13 nm, a high color purity of 98%, and an internal quantum efficiency (IQE) of 65.41%. Moreover, the material demonstrates excellent thermal stability, retaining 93.11% of its initial luminescence intensity at 423 K, corresponding to a thermal activation energy of 0.2917 eV. To demonstrate its practical utility, a white LED device was fabricated by combining the optimized green phosphor (KAO: 0.07Eu 2+ , 0.04Mn 2+ ) with a blue phosphor (BaMgAl 10 O 17 (BAM): Eu 2+ ), a red phosphor (Ca 9 KMn(PO 4 ) 7 : Eu 2+ ), and a 365 nm near-ultraviolet chip. The resulting device achieves a wide color-gamut covering 107.8% of the NTSC standard. Collectively, these results demonstrate that precise control of site occupancy and energy transfer enables the design of green phosphors that simultaneously exhibit narrow-band emission, high color purity, and robust thermal stability-properties that are essential for wide color-gamut WLED backlight displays.
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ACS Applied Electronic Materials
·
2026
·Vol. 8
·期 17
·7601-7616
·
IF 4.7
Yao Zhiqian,Zhong Wei,Wei Haoshan,Zhang Jie,Zhang Yong,Zhang Xueru,Cui Jiewu,Wang Yan,Liu Jiaqin,Wu Yucheng
With the rapid advancement and widespread adoption of millimeter-wave technology, developing high-performance microwave-absorbing materials has become critical for addressing electromagnetic interference and radiation pollution. To meet electromagnetic compatibility requirements in the 18−40 GHz frequency range, this study proposes a Nb 5+ -Mn 2+ cosubstitution strategy and fabricates Ba(NbMn) x Fe 12-2x O 19 absorbers via a sol-gel method. The results show that increasing the substitution ratio (X) modifies ion occupation, shifting the absorbers’ natural resonance frequency to the 21 GHz and 35 GHz atmospheric windows while broadening the microwave absorption bandwidth. Specifically, when X = 0.3, the absorber achieves an absorption peak of −43.37 dB in the K-band with an effective absorption bandwidth (EAB) of 6.46 GHz. When X = 0.2, it exhibits a superior absorption peak of −54.51 dB in the Ka-band, accompanied by an ultrabroad EAB of 12.87 GHz. The mechanism analysis reveals that Nb 5+ -Mn 2+ cosubstitution constructs a synergistic magnetoelectric loss system: it enhances magnetic loss, triggers multidielectric polarization, and optimizes impedance matching which collectively enables excellent broadband microwave absorption through magnetoelectric synergy. This work provides a viable strategy for designing high-frequency microwave absorbers and highlights the significant potential of Nb 5+ -Mn 2+ cosubstituted M-type barium ferrites in electromagnetic wave absorption applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Ti Feng,Feng Tian,Huangyao Chen,Long Jie Zhang,Jun Zhang,Chaoyong Deng,Ruirui Cui
In the pursuit of environmentally friendly luminescent materials, lead-free double perovskites (LFDPs) have emerged as a promising candidate, distinguished by their unique photophysical characteristics. Concurrently, the development of a single-component phosphor capable of generating stable, full-spectrum white light presents a formidable challenge, standing in contrast to the prevalent multi-phosphor systems used in contemporary white light-emitting diodes (WLEDs). Here, we report the design and synthesis of a triple-doped Cs 2 NaYCl 6 : Sb 3+ , Tb 3+ , Mn 2+ material, achieving single-phase white light emission. In contrast to the pristine Cs 2 NaYCl 6 host, which displays only weak sky-blue luminescence, a remarkable augmentation in the intensity of its self-trapped exciton (STE) emission is observed upon Sb 3+ doping. The enhanced STE-based emission can be primarily attributed to the novel sensitizing state introduced by Sb 3+ doping. The effective STE energy transfer to Tb 3+ and Mn 3+ under Sb 3+ sensitization overcomes the inherent drawbacks of efficiency and color rendition in single-matrix WLEDs. The white light emission can be precisely tuned by simply adjusting the doping ratios. A WLED device was fabricated by integrating the as-synthesized phosphor with a 340 nm UV chip. The device exhibited promising white light performance, yielding a correlated color temperature (CCT) of 5133 K, a color rendering index (CRI) of 92.1, and CIE coordinates of (0.3422, 0.3587), thereby validating its strong potential for practical white lighting applications.
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ChemistrySelect
·
2026
·Vol. 11
·期 28
·e73876
·
IF 2.3
Tao Liu,Huichao Zhang,Bo Huang,Shitong Li,Bin Liu
Mn 2+ -doped perovskite nanocrystals (NCs) have attracted extensive research interest and have been synthesized with sizes in the strong confinement regime. Nevertheless, the size of the doped NCs is still not as small as that of undoped perovskite NCs. To address this, we develop a ligand-assisted reprecipitation method incorporating ultrasonication to synthesize Mn 2+ -doped CsPb(Cl/Br) 3 NCs. The obtained spherical NCs have an average size of 3.1 nm and exhibit orange photoluminescence originating from the 4 T 1 to 6 A 1 transition of Mn 2+ . The luminescent properties correlate with the volume ratio of MnCl 2 to PbBr 2 precursors. Increasing the ratio enhances the Mn 2+ -related emission, while excessive doping leads to photoluminescence quenching. When the precursor ratio is reduced to 1:1, the NCs exhibit both intrinsic exciton and Mn 2+ -related emission, with some particles adopting cubic or rod-like morphologies. Prolonged ultrasonic treatment does not significantly shift the emission peak of the NCs, but promotes superlattice assembly in small-sized NCs, showing a center-to-center separation of 4.2 nm. Subsequently, altering the precursor addition sequence to introduce MnCl 2 last during ultrasonic preparation yields simultaneous formation of spherical and cubic NCs. Finally, post-synthesis doping of Mn 2+ is achieved. Formation of small spherical NCs confirms hypothesis that MnCl 2 induces morphological transformation of NCs. Graphical Ultrasonication-assisted ligand-assisted reprecipitation delivers 3.1 nm Mn 2+ -doped CsPb(Cl/Br) 3 nanocrystals with orange emission from the Mn 2+ 4 T 1 → 6 A 1 transition.
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Nanomaterials
·
2025
·Vol. 15
·期 13
·1002
·
IF 4.3
Yu-Lin Hu,Yi-Lin Zhu,Shi-Ying Gu,Jia-Qing Xu,Zhi-Xing Gan,Chuan-Guo Shi
Mn2+doped metal halide that can be grown by a facile solution reaction is a promising low-cost afterglow material. However, the afterglow mechanism is still elusive. Using a facile method to modulate afterglow time is still to be explored. In this work, we reveal that the afterglow of Cs2Na0.2Ag0.8InCl6:y%Mn can be significantly modulated by Mn2+concentration. We propose that replacing Ag+with Mn2+leads to the appearance of interstitial Ag+, which temporally store the photogenerated electrons (Ag++e−→Ag). After the removal of excitation, the gradual recombination between residual holes and stored electrons [h++Ag++e−→hν+Ag+] explains the afterglow. However, excessive Mn2+doping at interstitial sites does not bring about more interstitial Ag+but instead introduces nonradiative traps. Therefore, as the Mn2+concentration increases, the afterglow time increases from 350 s to 530 s and then decreases to 230 s, reaching a maximum at y = 40. Thus, a dynamic optical information storage and encryption application is demonstrated based on the modulated afterglow time.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Kangjing Wu,Yunzhen Hu,Shuai Wang,Zhanfang Cao,Xin Ma,Hong Zhong
Solvent extraction is considered as an eco-friendly and efficient technology to extract manganese from an industrial leaching solution based on ores or post-consumer products. However, it is imperative to propose a novel extractant capable of independently and selectively extracting manganese ions from impurities since the separation efficiency of a single extractant is limited. We introduced a novel extractant di-neodecyl ethanedione monoxime (DEM) to extract manganese ions and conducted a comparative extraction analysis with neocapric acid (Versatic 10). The maximum extraction efficiencies of DEM and Versatic 10 separately achieved at 97.34% and 87.62%. And the selectivity tests for the extraction and separation of Mn 2+ and Mg 2+ suggested that DEM exhibited superior selectivity towards manganese ions than Versatic 10. FTIR spectrum analysis, saturation capacity experiments and mass spectrometry suggest that DEM can form a dual-ligand six-membered ring metal complex with manganese or magnesium ions through the formation of coordination bonds of N−O−M and C−O−M (M=Mn 2+ or Mg 2+ ). EDA-NOCV analysis illustrated that the π-backbonding between manganese atoms and extractant ligands contributes to the selectivity separation of manganese and magnesium ions. And the π-backbonding bond between the oxime group (–C=N–OH) and the manganese ion is stronger than that of the carbonyl group (–(C=O)–OH), confirming that DEM demonstrated superior selectivity compared to Versatic 10 in extracting manganese ions from magnesium ions.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Sijia Xu,Fengchao Wang,Jinfang Kong,Canyun Zhang,Lan Li,Jin Chen,Jing Yang,Yu Sun
High Mn 2+ doping concentration can lead to the formation of high-density defects/trap states, which serve as non-radiative recombination centers, seriously restricting the energy transfer efficiency from the host nanocrystals to Mn 2+ . Herein, we introduce Cd 2+ into Mn 2+ -doped CsPb(BrCl) 3 nanocrystalline (NCs) film to effectively suppress non-radiative recombination. The analysis of the structure and composition confirmed the phase and chemical composition of the Cd 2+ -Mn 2+ co-doped CsPb(BrCl) 3 NCs film. Steady-state and time-resolved photoluminescence (PL) spectra revealed the enhanced optical properties of the co-doped CsPb(BrCl) 3 NCs film. The Mn 2+ emission peak is studied in the temperature range of 80 K–300 K. Strong electron-phonon coupling causes an anomalous blueshift and linewidth broadening of the Mn 2+ emission peak with increasing temperature. Temperature-dependent PL spectra confirmed that the energy transfer between the exciton emission peak and the Mn 2+ emission peak was regulated through Cd 2+ doping, achieving the negative thermal quenching effect. This study utilized C 9 H 23 NO 3 Si (APTES) for the surface encapsulation of the NCs film to enhance their stability. Substituting Pb 2+ with Cd 2+ and Mn 2+ enhances the stability of the nanocrystals and alleviates lattice distortion within the [PbCl 6 ] 4- octahedral framework. The experimental results indicate that the Mn 2+ emission peak of the co-doped CsPb(BrCl) 3 NCs film retains 80.7% of its luminescent intensity after 31 days of storage in air, thereby confirming its excellent optical stability.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Feng Wang,Jian Lin,Shansheng Yu,Xiaoqiang Cui,Asghar Ali,Tao Wu,Yang Liu
Understanding and revealing the connection between defects and dopant for improving electrogenerated chemiluminescence (ECL) efficiency remain a constant challenge. In this work, the in situ Mn2+-doped Mn1.36Zn5.64In28S56 supertetrahedral chalcogenide semiconductor nanoclusters (NCs) with an ECL efficiency as high as 27.1% was obtained, the corresponding ECL behaviors were investigated, and the vital role of more anti-site defects (ADs) introduced in situ on the ECL emission was elucidated. The ADs can not only give rise to the ECL emission peak at 494 nm but also assist transfer of electrons to induce and enhance the ECL emission at 627 nm from doped Mn2+ in the NCs. Furthermore, based on the fact that dissolved oxygen can enhance the ECL intensity, a highly sensitive ECL sensor for the determination of dissolved oxygen was developed. This insight into the fundamental interactions between Mn2+ dopants and defects in NC host may open new opportunities for the design of novel ECL materials to promote their application potential in electrochemical analysis and imaging.
研究领域:
材料科学
·
电化学
·
分析化学
·
纳米技术
·
发光材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Songchao Bai,Hao Liang,Chao Li,Cunduo Tang,Gang Yang,Xiumei Xu,Xingqiang Yang,Gencai Pan,Yongsheng Zhu
Lead-free perovskites are a new type of luminescent material with non-toxic, stability and excellent photoelectric properties, which have great application in the field of photoelectric detection, solar cells, bio-imaging, etc. Here, we reported a new kind of uniform spherical rare-earth based double perovskite Cs 2 NaYCl 6 nanocrystals (NCs) as versatile hosts to accommodate ionic dopants for improving photoelectric properties especially the luminescent properties. In contrast to the low quantum yield of only 5.62%, the luminescent intensity of Cs 2 NaYCl 6 NCs can be impressively enhanced via doping Sb 3+ and Mn 2+ ions in the rare earth-based double perovskite lattices. For the Sb 3+ -doping, the photoluminescence quantum yield (PLQY) increases from 5.62% to 22.48%. On this basis, the luminescence colors can be tuned from blue to white and red via Mn 2+ ions doping and the maximum PLQY can be further improved to 38.66%. Finally, the Sb 3+ , Sb 3+ /Mn 2+ ions doped Cs 2 NaYCl 6 NCs based blue, red and white LEDs were explored, which indicates that these are potential materials in multicolor LEDs applications.
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