JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1216-1229
·
IF 4.186
Guangtao Lu,Yichao Wang,Siqi Piao,Jinsu Zhang,Xizhen Zhang,Xufeng Zhou,Yongze Cao,Xiangping Li,Baojiu Chen
The excellent narrow-band emitters, especially the green ones, are regarded as a pivotal research direction for light-emitting diodes (LED) backlights in liquid-crystal displays (LCDs). A nearly single-peak green emission centered at 513 nm with a full width at half maximum of 28 nm is reached in KAl 11 O 17 :0.1Eu 2+ , 0.15Mn 2+ phosphor via nearly 100% energy transfer (ET) efficiency, and the extended X-ray absorption fine structure analysis elucidates its mechanism, which is that Eu 2+ and Mn 2+ are constrained to form Eu 2+ –Mn 2+ pairs with a small distance 3.7 Å caused by the local environment relaxation inducement. Meanwhile, by creating an unhindered energy flow between Eu 2+ , Mn 2+ and K + /O 2− defect levels through ET and multilevel electron trapped and recombination process, the KAO:Eu 2+ , Mn 2+ phosphors perform superb photoluminescence property with a high color purity of 83%, an excellent thermal stability (94%@200°C), and unexceptionable internal and external quantum efficiencies of 91.7% and 66.4%, which all are superior to characteristics of commercial β-SiAlON:Eu 2+ phosphor. Moreover, the white LED fabricated using KAO:Eu 2+ , Mn 2+ to provide green component shows a wide color gamut of 105% National Television System Committee. These results indicate a potential for an application of our material in LCD–LED backlights, and the design of such local relaxation-induced structure provides a significative reference to develop the new narrow-band emitters.
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245701
·
IF 3.953
Ziyan Kong,Huiying Wang,Kun Hou,Lunhui Guan
The research on low-cost, high-performance non platinum group metal (PGM) oxygen reduction reaction (ORR) catalysts is of great significance for the rapid promotion of fuel cells' practical applications. In this work, Mn–N–C catalyst with outstanding activity was prepared through using hydrogel formed by coordination of sodium alginate (SA) and Mn2+ as the precursor. During the preparation process, g-C3N4 was added to improve the surface area enrich the pore structure of catalysts, as well as to function as the nitrogen source. Compare with commercial Pt/C catalyst, the optimum Mn–N–C catalyst possesses extraordinary ORR activity in alkaline electrolytes, with a half-wave potential (E1/2) of 0.90 V. In addition, the Mn–N–C catalyst also displays exceptional stability in alkaline and acidic electrolytes, much superior to Pt/C catalyst.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Canxu Chen,Shuai Zhang,Ruosheng Zeng,Binbin Luo,Yuanjie Chen,Sheng Cao,Jialong Zhao,Bingsuo Zou,Jin Zhong Zhang
Two-dimensional (2D) hybrid layered perovskites (HLPs) have attracted extensive attention due to their excellent optoelectronic properties. Herein, we successfully prepared high-quality Mn-doped BDACdBr4 (BDA = NH2(CH2)4NH2, butylene diammonium) HLP single crystals (SCs). The incorporation of Mn2+ ions modulates the electronic band structure of BDACdBr4 perovskites and tailors the energy transfer process of excited states. A near-unity photoluminescence (PL) quantum yield of 96% from the Mn2+ emission at 608 nm is achieved. Excitation wavelength-dependent spectroscopic characterizations help to clarify the energy transfer mechanism of Mn-doped BDACdBr4, in which competing PL from the 3Eg → 1A1g transition of Cd2+ and the 4T1(G) → 6A1(S) transition of Mn2+ dopants is observed. Temperature-dependent PL spectroscopic characterizations indicate that the efficient energy transfer from BDACdBr4 perovskite host to Mn2+ dopants requires thermal activation to overcome a potential barrier. This work provides new insight into the photophysics and optical properties of 2D HLPs, especially the influence of Mn2+ doping on competing energy transfer in hybrid luminescent materials.
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Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 3
·482-492
·
IF 6.707
Niu Xiang,Jian Xiaodong,Chen Xianyi,Li Haoxuan,Liang Wei,Yao Yingbang,Tao Tao,Liang Bo,Lu Sheng-Guo
(Ba 1− x Sr x )(Mn y Ti 1− y )O 3 (BSMT) ceramics with x = 35, 40 mol% and y = 0, 0.1, 0.2, 0.3, 0.4, 0.5 mol% were prepared using a conventional solid-state reaction approach. The dielectric and ferroelectric properties were characterized using impedance analysis and polarization-electric field ( P – E ) hysteresis loop measurements, respectively. The adiabatic temperature drop was directly measured using a thermocouple when the applied electric field was removed. The results indicate that high permittivity and low dielectric losses were obtained by doping 0.1–0.4 mol% of manganese ions in (BaSr)TiO 3 (BST) specimens. A maximum electrocaloric effect (ECE) of 2.75 K in temperature change with electrocaloric strength of 0.55 K·(MV/m) − 1 was directly obtained at ∼21 °C and 50 kV/cm in Ba 0.6 Sr 0.4 Mn 0.001 Ti 0.999 O 3 sample, offering a promising ECE material for practical refrigeration devices working at room temperature.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yunyun Hu,Xin Guo,Peilin Gu,Qin Luo,Yang Song,Erqun Song
Since circulating tumor DNA (ctDNA) has been regarded as a promising noninvasive biomarker for early cancer screening, cancer condition monitoring, and prognosis evaluation, the accurate and simple detection of ctDNA has been extensive explored. Up to now, there is still a lot of space for following-up the assay of ctDNA, especially simply direct analysis ctDNA in complex biological samples such as blood sample. In this work, we develop a Mn 2+ -mediated magnetic relaxation switching (MRS) assay for direct and simple detection of ctDNA via exonuclease III-assisted signal amplification. In the presence of target ctDNA, exonuclease III selectively cleaves the hybridization complex of between ctDNA and its complementary DNA labeled with magnetic beads and alkaline phosphatase (MB 1000 -DNA 1 -ALP) to release ALP and ctDNA, the former further generating Mn 2+ and causing transverse relaxation time signal change while the later recycling to amplify the signal. The combination of efficient recognition of ctDNA, enzyme-assisted amplification, and the MRS assay could achieve direct and specific detection of ctDNA with a detection limit of 340 pM. In our opinion, this is the first successful direct detection of ctDNA in whole blood sample without ctDNA extraction from biospecimen, which make the assay for ctDNA much accurate and timely since a short half-life (2 h) of ctDNA in blood. The as-proposed method for ctDNA assay in this study shows potential tracking the evolution of tumor timely and serving as a liquid biopsy for diagnosis.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2018
·期 29
·3418-3426
·
IF 2.507
Liying Yu,Guojuan Ren,Mingyu Tang,Baoya Zhu,Fang Chai,Gang Li,Dandan Xu
Graphical We have synthesized a dual-emissive colorimetric fluorescent glutathione carbon dot (GSH-CDs) probe that can be used to detect Zn 2+ , Mn 2+ , and Cu 2+ separately or simultaneously by observing the change in fluorescence color and referring to the truth table. Because the probe has low cytotoxicity, it can be used in cell imaging. Dual-emissive fluorescent glutathione carbon dots (GSH-CDs) have been synthesized by a green hydrothermal method and used as a colorimetric fluorescent probe for the multi-detection of Zn 2+ , Mn 2+ , and Cu 2+ individually or simultaneously. The GSH-CDs exhibit dual fluorescence emission at 460 and 683 nm, which results in cyan fluorescence emission under UV light. The dual-emissive GSH-CDs can be used as a multifunctional colorimetric fluorescent nanoprobe for precise and quantitative detection of Zn 2+ , Mn 2+ , and Cu 2+ through a change in the color of the fluorescence. Upon interaction with Zn 2+ , the fluorescent color of the GSH-CDs was transformed from cyan to pink. When exposed to Mn 2+ or Cu 2+ , the fluorescence color was transformed from cyan to blue. When the three ions were present simultaneously, the cyan fluorescence emission changed to a nattier blue. The minimum limits of detection (LODs) for Zn 2+ , Mn 2+ , and Cu 2+ were calculated to be 9.64, 3.24, and 1.7 n m , respectively. As far as we know, this is the first report of the use of dual-emissive carbon dots for the multi-detection of heavy-metal ions. Moreover, the multi-detection of Zn 2+ , Mn 2+ , and Cu 2+ in real environmental water by GSH-CDs was also investigated. In addition the GSH-CDs can be applied in cell imaging.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Bo Zhou,Yasin Muhammad,Dong Ding,Zexiang Liu,Hanlin Hu,Ye Wang,Haizhe Zhong,Yumeng Shi,Henan Li
Multi-ion codoping strategies have been intensively studied for metal halide perovskite optical engineering. Although tunable dual broadband emissions can be achieved by pairing Sb3+/Mn2+ doping centers in metal halide hosts, there have been few reports of highly efficient light emission with a near-unity photoluminescence quantum yield (PLQY). In this study, Mn2+ dopants are incorporated into a Sb3+-doped Rb4CdCl6 system. Tunable dual emissions and a substantial increase in the PLQY from ∼60% to near-unity (98%) are achieved. Energy transfer is strong and localized and occurs only between the Sb3+ donor and the adjacent Mn2+ acceptor. The green self-trapped exciton emission (524 nm) is converted into a red d–d emission (607 nm) without changing the excitation profile. The Sb3+ optical centers without adjacent Mn2+ species maintained their original green emission. Spectroscopic and probabilistic investigations showed that the luminescent and thermally quenched Sb3+ optical centers play identical roles in the energy-transfer process, and nonradiative recombination was successfully inhibited. These findings clarify how Sb3+ and Mn2+ dopants couple in the metal halide host and facilitate the design of high-performance materials that give tunable broadband fluorescence via an energy-transfer process.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 27
·9281-9290
·
IF 6.4
Sixiang Wang,Yichang Wang,DaeHo Yoon,Tianrong Li,Yuhua Wang
Green light conversion materials with small particle sizes and high luminous quality are essential for high-resolution display technology, such as Mini-LEDs and Micro-LEDs. Here, we demonstrate an effective strategy to prepare a sub-micrometer green phosphor via doping Mn2+ in a small-sized organic–inorganic hybrid Zn(II) bromide (C8H20N)2ZnBr4. Among a series of prepared (C8H20N)2Zn1−xMnxBr4 (x = 0–1.0), (C8H20N)2Zn0.7Mn0.3Br4 showed a particle size of around 700 nm, an emission peak centered at 517 nm with a full width at half maximum of 47 nm, a photoluminescence quantum yield of about 80%, and a stabilized photoluminescence intensity with a slight increase under continuous UV-light illumination over a 30 day test range. A [MnBr4]2− tetrahedron was effectively split by a massive tetraethylammonium cation (C8H20N)+ and [ZnBr4]2− tetrahedron unit in the zero-dimension structure, which was considered responsible for reducing the electron–phonon coupling of Mn2+, accelerating the leap process of [MnBr4]2−, and enhancing the optical and thermal stability of emitting centers. These results indicated that (C8H20N)2Zn0.7Mn0.3Br4 is a valuable candidate for Mini-LEDs and Micro-LEDs.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Jun Ye,Mingming Zhang,Jian Xiong
A novel, rapid, high selective and sensitive probe, carboxymethyl cellulose (CMC)/Tb(III) with green fluorescence, for detecting Mn 2+ in aqueous solution during pH = 4–10 was proposed in this work. The probe’s synthesis had benefits of mild reaction condition, organic solvent-free and facile operation. A linear relationship between the fluorescence intensity of CMC/Tb(III) probe at 544 nm with 0.046 μM detection limitation and the concentration of Mn 2+ in the range of 0.1–100 μM was obtained. The probe was also used to detected Mn 2+ in tap water and the recoveries were between 97.10% and 101.61%, and the relative standard deviations (RSD, n = 5) of all samples were less than 2.04%. The results by UV absorption spectrum and fluorescence quenching suggested that there might be a dynamic quenching occurred to the fluorescence of CMC/Tb(III) probe when Mn 2+ was involved.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 36
·9281-9287
·
IF 5.256
Fei Li,Zhiguo Xia,Yue Gong,Lin Gu,Quanlin Liu
The emission colors of cesium lead halide perovskite nanocrystals (NCs) can be controlled by dynamic ion exchange and Mn2+ doping. Herein we report a novel strategy for the synthesis of Cs(PbxMn1−x)(ClyBr1−y)3 NCs via a post-synthetic cation–anion cosubstitution exchange reaction to tailor their optical properties in a wide range. Colloidal CsPbBr3 and CsPb1−xMnxCl3 NCs are firstly prepared, separately, and then mixed together in hexane solution. The Pb2+ and Br− ions in the CsPbBr3 NCs are simultaneously exchanged for the Mn2+ and Cl− ions in the CsPb1−xMnxCl3 NCs, resulting in homogeneous Cs(PbxMn1−x)(ClyBr1−y)3, with preservation of the shape and crystal structure of the initial NCs. This in situ ion exchange method avoids the degradation of photoluminescence originating from the additional purification process of the NCs, and in situ Mn2+ substitution also greatly enhances the emission intensity and quantum yield of the as-obtained NCs, which is found to be related to the bound exciton effect.
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Jianguo Zhang,Shaozhen Wang,Ni Gao,Dexiang Feng,Lun Wang,Hongqi Chen
A new turn-on luminescence energy transfer (LET) system has been designed for the detection of prostate specific antigen (PSA, a cancer marker) that utilizes Mn 2+ -enhanced long wavelength luminescence NaYF 4 : Yb, Er upconversion nanorods as the donor and gold nanorods as the acceptor. The Mn 2+ -doped NaYF 4 :Yb,Er upconversion luminescence nanorods with an emission peak located in the red region were synthesized. The presence of Mn 2+ markedly increased the luminescence intensity over that of the NaYF 4 :Yb, Er upconversion nanomaterials (excited by a 980 nm continuous wavelength laser). The surfaces of Mn 2+ -doped NaYF 4 :Yb, Er upconversion nanorods were modified with poly(acrylic acid). Antibodies against prostate specific antigen were bound to the surface of the carboxyl-functionalized upconversion nanorods, which acted as the energy donor in this LET system. Gold nanorods with an absorption band at ~666 nm were synthesized by the seed growth method, acted as the energy acceptor. The emission band of the upconversion nanorods overlapped well with the absorption band of the gold nanorods. The luminescence was quenched because of the electrostatic interactions that shortened the distance between the donor (negatively charged) and the accepter (positively charged).When the PSA antigen was added into the system, the energy acceptor and the energy donors were separated because the binding affinity between PSA and anti-PSA was greater than the electrostatic interactions, and thereby the luminescence was recovered. The linear range of detecting PSA was from 0.1172 to 18.75 ng/mL ( R =0.995), with a limit of detection for PSA as low as 0.1129 ng/mL. The method was successfully applied to the sensing of PSA in human serum samples.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 13
·2506-2512
·
IF 5.066
X. Y. Liu,H. Guo,Y. Liu,S. Ye,M. Y. Peng,Q. Y. Zhang
The design of white-light luminescent materials with excellent thermal stability is still a challenge in the field of white-light emitting diode (W-LED) application. In this paper, a pair of novel Bi3+/Mn2+ ions co-doped into white-emitting borosilicate glasses were successfully prepared using a melt-quenching method. Their luminescence properties were evaluated using transmission spectra, photoluminescence excitation and emission spectra in the temperature range of 300–573 K, and lifetime decay curves. Upon excitation with a ultraviolet (UV) light, the co-doped glasses exhibit intense tunable emitting color between the blue and the orange-red region due to efficient energy transfer from Bi3+ to Mn2+, and a perfect white light emission is realized by appropriately adjusting the Mn2+ concentrations. Furthermore, the Bi3+ singly doped glass presents good thermal stability, showing about 72.3% of the observed room temperature (300 K) emission intensity at 423 K, while the thermal stability becomes lowered after Mn2+ ions are incorporated into the singly doped sample, attributed to serious thermal quenching from Mn2+. This work may help to better understand the interactions between Bi3+ and transition metal ions, and it might also be helpful in the future design of organic resin-free W-LEDs.
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