Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 42
·9004-9011
·
IF 0
Zhuo Wang,Jing Feng,Shuyan Song,Zhiqiang Sun,Shuang Yao,Xin Ge,Min Pang,Hongjie Zhang
The pure and intense orange upconversion luminescence of Eu3+ was efficiently achieved in NaYF4 and NaLuF4 nanocrystals through the upconversion sensitization of doped Yb3+ and Mn2+ ions dimer for the first time. A shell-coating strategy was performed to further enhance the emission intensity. In this work, a novel upconversion mechanism for energy transfer from the Yb3+–Mn2+ dimer to the Eu3+ ion was proposed by analyzing the upconversion luminescence spectra, lifetimes and pumping photons measurements of the obtained nanocrystals in detail. The applications of the nanocrystals for CT imaging and ratiometric pH sensing in physiological pH range were performed. This study also provides a new upconversion spectral region at around 592 nm for applications in multicolor imaging, multiplexed encoding and detection.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yiying Zhu,Guoxun Sun,Yining Wang,Yixin Sun,Xiaole Xing,Mengmeng Shang
Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho3+-doped Cs2NaBiCl6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn2+, apart from the characteristic emissions from Ho3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn2+ and a sharp emission peak at 657 nm from Ho3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs2NaBiCl6 to Mn2+ and then from Mn2+ to Ho3+. The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn2+ overcomes the low absorption efficiency caused by f–f forbidden transitions of Ho3+. Finally, the diverse luminescent performance within the Cs2NaBiCl6:Ho3+, Mn2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.
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高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Zhenbeina Deng,Yusheng Xu,Qiudong Duan,Tianyu Guo,Xianchang Ning,Zhangwen Long,Dacheng Zhou,Qi Wang,Yugeng Wen,Jianbei Qiu
Zero-dimensional (0D) halide perovskites inherently exhibit inefficient energy transfer for lanthanide-based upconversion luminescence (UCL) due to isolated structural units. Despite extensive research efforts, the exploration and validation of thermally enhanced UCL in 0D perovskites remain notably limited. This study demonstrates that Mn 2+ /Yb 3+ /Er 3+ tri-doping can achieve a ninefold enhancement of Er 3+ UCL in 0D Cs 3 BiCl 6 with preferential amplification of green emission. In particular, structural analysis, electron paramagnetic resonance, and steady-state spectroscopies confirm that the formation of Yb 3+ -Mn 2+ dimers can overcome the limitation of an ultralong interionic distance of 0.774 nm, enabling efficient energy transfer upconversion at elevated temperatures. Furthermore, comparative investigations with one-dimensional (Cs 3 Bi 2 Cl 9 ) and three-dimensional (Cs 2 NaBiCl 6 ) perovskites reveal that the pronounced UCL enhancement originates from Mn 2+ -induced lattice distortion and facilitates energy transfer from Yb 3+ -Mn 2+ dimer to Er 3+ . Finally, the optical thermometry exhibits a high absolute sensitivity of 2.09%/K and outstanding thermal cycling properties in the 313–573 K range, paving the way for optical sensing applications and beyond.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 29
·9836-9844
·
IF 7.059
Xinxin Han,Enhai Song,Weibin Chen,Yayun Zhou,Qinyuan Zhang
Due to the lack of intermediate levels and the large energy mismatch with Yb3+, the achievement of efficient upconversion (UC) of Eu3+ is a great challenge. Herein, intense UC emission of Eu3+ is demonstrated via controllable and efficient unidirectional energy transfer from Yb3+–Mn2+ dimers in perovskite fluoride KCdF3:Yb3+,Mn2+,Eu3+ synthesized by a facile solvothermal method. The UC emission color of KCdF3:Yb3+,Mn2+,Eu3+ can be well tuned from yellow to orange and ultimately turned into Eu3+ pure red emission by controlling the Eu3+ concentration. Moreover, a significantly prolonged Eu3+ UC emission lifetime is observed in this system, and it is ascribed to the genetic effect of the sustained resonance energy transfer from Yb3+–Mn2+ dimers to Eu3+. The pump power and temperature dependent UC behaviors further suggest that the phosphor exhibits excellent chromaticity stability. Owing to the long-lived and chromaticity stable UC luminescence, the as-prepared KCdF3:Yb3+,Mn2+,Eu3+ phosphor may be a highly suitable candidate for lifetime-encoded information encryption, anti-counterfeiting, etc.
研究领域:
材料科学
·
光学
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 9
·2342-2350
·
IF 5.976
S. Ding,X. F. Yang,E. H. Song,C. L. Liang,B. Zhou,M. M. Wu,W. Z. Zhou,Q. Y. Zhang
Uniform perovskite core–shell nanocubes NaMn1−xMgxF3@NaMgF3 and NaMn1−xMgxF3:Yb3+@NaMgF3:Yb3+ have been successfully synthesized via a facile one-pot co-precipitation method at room temperature. The core–shell structures were carefully characterized by powder X-ray diffraction, transmission electron microscopy, scanning transmission electron microscopy and energy-dispersive X-ray elemental mapping. It was found that the formation mechanisms of the novel core–shell structures consist of aggregation of precursor molecules/ions, multiple nucleation, surface re-crystallization and further phase transformation. In addition, the DFT calculations further showed that Mn2+ ions tend to aggregate in NaMgF3:Mn2+, which may be one of the important intrinsic factors for the formation of the unique NaMn1−xMgxF3@NaMgF3 structure in this case. Besides, the unique core–shell structures NaMn1−xMgxF3:Yb3+@NaMgF3:Yb3+ can obviously enhance the near-infrared upconversion luminescence of Mn2+, which may find high potential in multiple high-resolution imaging applications.
研究领域:
材料科学
·
纳米技术
·
发光材料
·
无机化学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Xiaohua Jing,Zhumei Sun,Dandan Zhao,Xiaoning Tang,Wenjing Lv,Yunfeng Shi
In this study, five novel ionic liquids denoted by [RNH 3 ][Cyanex 272] where R = C 4 H 9 , C 6 H 13 , C 8 H 17 , C 10 H 21, and C 12 H 25 were synthesized in a one-step reaction of straight-chain primary amines and Cyanex 272. The singe-stage extraction performance of [RNH 3 ][Cyanex 272] for the separation of Mn 2+ , Co 2+ , Ni 2+ and Li + was investigated. Compared with the other [RNH 3 ][Cyanex 272], the [C 4 H 9 NH 3 ][Cyanex 272] has good selective extraction and separation of Mn 2+ , Co 2+ , and Ni 2+ due to the smaller different value between the radius of metal ion and the radius of [C 4 H 9 NH 3 ] + . Using a three-stage cross flow extraction, the extraction percentages of Mn 2+ , Co 2+ , Ni 2+ , and Li + were about 99.4, 99.1, 14.9 and 0.9 %. The [C 4 H 9 NH 3 ][Cyanex 272] is a good extraction agent for co-extraction of Mn 2+ , Co 2+ , and a part of Ni 2+ from Li + based on a three-stage cross flow extraction. Diluted sulfuric acid was used to strip the organic phase containing Mn 2+ , Co 2+ , and Ni 2+ , and the aqueous phase containing Mn 2+ , Co 2+ , and Ni 2+ can be used for the preparation of ternary precursor materials. The precipitation method can be used to prepare Ni(OH) 2 and Li 2 CO 3 from an aqueous phase containing Ni 2+ and Li + . The conceptual recycling flow-sheet for Mn 2+ , Co 2+ , Ni 2+ , and Li + from spent ternary lithium batteries was presented on basis of the new extraction agent. The slope method was also used to investigate the mechanism of the extractive reaction of Mn 2+ , Co 2+ , and Ni 2+ using the [C 4 H 9 NH 3 ][Cyanex 272].
研究领域:
化学工程
·
材料科学
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xuesong Ye,Zhencheng Ge,Qiliang Xiao,Bohan Liu,Meng Chen,Fangmin Wu,Jun Nan
In remote areas, low-pressure ultrafiltration membrane (LPM) systems can be applied in decentralized water supplies for the treatment of groundwater containing Fe 2+ , Mn 2+ , and NH 4 + . However, improving the performance of the LPM systems, such as the stable flux and removal capacity, presents a challenge. In this study, a novel opposite-flow low-pressure ultrafiltration membrane (O-LPM) system was applied, and its performance was evaluated. Experimental results showed that after 46 days of operation, the steady flux of the O-LPM systems were 1.87-fold and 1.74-fold higher than that of the conventional D-LPM systems under Mn 2+ concentration of 0.3 mg L −1 and 1.5 mg L −1 , respectively. With a mixed pollutant system containing Fe 2+ (0.5 mg L −1 ), Mn 2+ (0.3 mg L −1 ), and NH 4 + (1.0 mg L −1 ), the O-LPM-ripening period for Mn 2+ removal was shortened from 16 days to 8 days, and the NH 4 + removal efficiency was increased from 61.46% to 80.97%. The bio-cake layer in the O-LPM systems was thinner and had a higher uniformity than in the D-LPM systems, resulting in a larger stable flux range. The relative abundance of functional bacteria (MnOB, IOB, and NOB) was generally higher in O-LPM systems than in the D-LPM systems. Overall, these results are of high relevance for groundwater treatment in remote areas, providing guidance for the widespread application of the O-LPM system in decentralized water supplies.
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高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Jun Chen,Yi Chen,Dzmitry Hrynsphan,Yu Mei,Hua Pan,Jiali Wu,Jianmeng Chen,Jiachao Yao
FeII(EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated FeII(EDTA)–NO restricts its wide application, suggesting that FeII(EDTA)–NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of FeII(EDTA)–NO reduction by Mn powder coupled with manganese ion (Mn2+) recovery. We initially studied the performance of FeII(EDTA)–NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial FeII(EDTA)–NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between FeII(EDTA)–NO solution and Mn powder, suggesting that the solid–liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol–1. The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn2+ recovery. Finally, according to Arrhenius and Eyring–Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn2+ recovery were calculated as 17.25 kJ mol–1, 14.55 kJ mol–1, and 252.07 J (k mol)−1, respectively.
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Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 4
·1309-1316
·
IF 6.4
Zhichao Liu,Yuexiao Pan,Xiaoxiao Fu,Yihong Ding,Liyi Li
The development of efficient, non-toxic, and cost-effective white-light emitters is crucial for advancing lighting technology. Here, we present a groundbreaking study on a new all-inorganic perovskite crystal, CsCaCl3:Mn2+, which exhibits temperature sensing and hue-tunable white light emission. The CsCaCl3 matrix emits broad blue light at 455 nm due to self-trapped exciton (STE) emission. Upon Mn2+ doping, the CsCaCl3:Mn2+ crystal emits broad yellow light at 555 nm, originating from the Mn2+ 4T1(G)–6A1(S) transition. Increasing Mn2+ concentration led to a decrease in blue emission intensity, accompanied by enhanced yellow emission, suggesting an energy transfer from STEs to Mn2+. The enhanced stability of CsCaCl3:Mn2+ compared to pure CsCaCl3 is demonstrated through thermal analysis. The distinctive temperature-dependent responses of STE and Mn2+ emissions in CsCaCl3:Mn2+ suggest its potential application in temperature sensing. The synthesis process for this luminescent crystal is both straightforward and scalable, making it a promising candidate for large-scale applications.
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RSC Advances
·
2023
·Vol. 13
·期 28
·19039-19045
·
IF 3.9
Jie Zhang,Kai-Qi Sun,Zhong-Hui Zhang,Ri-Cheng Wang,Zi-Han Lin,Xiao-Wu Lei,Yu-Yin Wang,Ping Ju,Yuan-Chun He
Organic–inorganic hybrid low-dimensional lead halides have garnered significant interest in the realm of solid-state optical materials due to their unique properties and potential applications. In this study, we report the synthesis, characterization and application of Mn2+-doped one-dimensional (1D) [AEP]PbCl5·H2O hybrid lead halide perovskites with tunable photoluminescence properties. The Mn2+ doping leads to a redshift of the dominant emission wavelength from 463 nm to 630 nm, with the optimal doping concentration resulting in an enhanced photoluminescence quantum yield (PLQY) from less than 1% to 8.96%. The structural and optical stability of these doped perovskites have been thoroughly investigated revealing excellent performance under humid and high-temperature conditions. Perovskite–PVP composite films exhibit high crystallization and bright orange-red emission under UV excitation. Furthermore, we demonstrate the successful fabrication of a white LED device using the Mn2+-doped perovskite in combination with commercial green and blue phosphors. The fabricated LED exhibits a high color rendering index (CRI) of 87.2 and stable electroluminescence performance under various operating currents and extended operation times. Our findings highlight the potential of Mn2+-doped 1D hybrid lead halide perovskites as efficient and stable phosphors for high-performance white light emitting diodes and other optoelectronic applications.
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Analytical Methods
·
2019
·Vol. 11
·期 28
·3570-3577
·
IF 2.378
Baoya Zhu,Mingyu Tang,Liying Yu,Yaoyao Qu,Fang Chai,Lihua Chen,Hongbo Wu
In this paper, silicon nanoparticles (Si NPs) were synthesized by a simple one-step procedure by applying uric acid as reducing agent. The as-prepared Si NPs exhibited emission at 425 nm under excitation at 345 nm, allowing them to be developed as a fluorescent and colorimetric probe for detection of Cu2+ and Mn2+. As a probe, the fluorescence and color change of the Si NPs induced by Cu2+ and Mn2+ exhibited contrast. As a fluorescence probe, the Si NPs exhibited intense enhancement caused by Cu2+ and Mn2+ with detection limits of 0.562 μM (Cu2+) and 1.02 μM (Mn2+). More significantly, the Si NPs could be applied to effectively detect Cu2+ and Mn2+ in real samples. Interestingly, a Si NPs-based gel membrane was fabricated and established to be selective for visual recognition of Cu2+ and Mn2+. A cell imaging experiment revealed that the Si NPs possessed excellent biocompatibility and low cytotoxicity in living cells. Additionally, the powder form of the Si NPs can be easily prepared and used to visualize latent fingerprints (LFPs) with good performance.
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高影响因子
BIOMATERIALS
·
2015
·
IF 8.557
Xiaoran Deng,Yunlu Dai,Jianhua Liu,Ying Zhou,Ping'an Ma,Ziyong Cheng,Yinyin Chen,Kerong Deng,Xuejiao Li,Zhiyao Hou,Chunxia Li,Jun Lin
Combining the multi-modal medical imaging with cancer therapy in one single system has attracted the great interests for theranostic purpose. In this paper, CaF 2 :Yb 3+ /Er 3+ /Mn 2+ -poly(2-Aminoethyl methacrylate) (UCHNs-PAMA) hybrid microspheres were successfully fabricated. The synthetic route to the nanocomposite based on a facile hydrothermal method for fabrication of hollow upconversion (UC) nanospheres at first and then post-filling the PAMA interiorly through photo-initiated polymerization. The UCHNs showed orange fluorescence under 980 nm near infrared (NIR) laser excitation , which provided the upconverting luminescence (UCL) imaging modality . Meanwhile, the presence of functional Mn 2+ and Yb 3+ offered the enhanced T 1 -weighted magnetic resonance (MR) and computed tomography (CT) imaging, respectively. Thanks to introducing amine groups-containing PAMA inside the hollow nanospheres, the Pt(IV) pro-drug, c,c,t-Pt(NH 3 ) 2 Cl 2 (OOCCH 2 CH 2 COOH) 2 (DSP), can be conveniently bonded on the polymer network to construct a nanoscale anti-cancer drug carrier. The UCHNs-PAMA-Pt(IV) nanocomposite shows effective inhibition for Hela cell line via MTT assay . In contrast, Pt(IV) pro-drug and UCHNs-PAMA microspheres behave little cytotoxicity to Hela cells. This should be attributed the fact that the anti-cancer ability can be recovered only when Pt(IV) pro-drug was reduced to Pt(II)-drug in cellular environment. Furthermore, the in vivo experiments on small mice also confirm that the hybrid microspheres have relatively low toxic side effects and high tumor inhibition rate. These findings show that the multifunctional hybrid microspheres have potential to be used as UCL/MR/CT tri-modal imaging contrast agent and anti-cancer drug carriers.
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