Journal of Materials Chemistry C
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2024
·Vol. 12
·期 28
·10504-10512
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IF 5.7
Jingshan Hou,Zhiyu Qin,Jianghua Wu,Tong Li,Langping Dong,Ganghua Zhang,Guoying Zhao,Yufeng Liu,Haijie Chen,Yongzheng Fang
A novel Mn2+ doped ScTaO4 phosphor was synthesized through a high temperature solid state method and its photoluminescence properties were systematically investigated. The ScTaO4:Mn2+ phosphor exhibited two emission bands centered at 478 nm and 661 nm under UV excitation, attributed to the self-activated emission of the host and the 4T1 → 6A1 transition emission from doped Mn2+ ions, respectively. Through optimizing the concentration of doped Mn2+ ions, white light emission was achieved. Meanwhile, the temperature-dependent luminescence spectra of the ScTaO4:Mn2+ phosphor (in the range from 298 K to 523 K) revealed significantly different thermal quenching behaviors between the host and Mn2+ ions, which cause a notable change in the fluorescence intensity ratio of the host versus Mn2+ ions and enable high absolute and relative sensitivities, with maximum values of 0.0172 K−1 and 2.1% K−1 at 523 K, respectively. The results indicated that the as-prepared STO:Mn2+ phosphor can be a potential candidate material for high temperature optical thermometry.
研究领域:
材料科学
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光学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 41
·1804150
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IF 13.325
Zhichao Zhang,Chonggeng Ma,Romain Gautier,Maxim S. Molokeev,Quanlin Liu,Zhiguo Xia
Structural confinement effect on a pair of Eu 2+ and Mn 2+ optical centers is developed to realize the greatly enhanced red emission attributed to the 4 T 1 ( 4 G)– 6 A 1 ( 6 S) transition of Mn 2+ ions. Sr 9 Mn 1.26(2) Li 0.24(2) (PO 4− δ ) 7 , when it is doped with Eu 2+ , emerges as a new red-emitting phosphor, and the intensity dependence of such a red emission on the trace amounts of Eu 2+ doping is quantitatively analyzed with a combined experimental and theoretical methods. The modeling result confirms the validity of this proposed design strategy, and the intrinsic high-efficient Eu 2+ –Mn 2+ energy transfer process can be elucidated by the structural confinement effect featured as some Sr (Eu) close to Mn atoms. The results can initiate the exploration of Mn 2+ -based red phosphors for pc-white light-emitting diodes applications, and such a strategy can be easily expanded to other systems, thus opening a new perspective for the development of luminescence materials.
研究领域:
材料科学
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光学
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DOI
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Rui Wang,Maohui Yuan,Chaofan Zhang,Hongyan Wang,Xiaojun Xu
Transition metal ions (e.g. Mn 2+ ) and lanthanide co-doped upconversion (UC) materials have attracted wide attention in recent years due to their promising application in multicolor display. Here, we report the hydrothermal synthesis and characterization of Mn 2+ doped monodisperse CaF 2 :Yb 3+ /Ho 3+ microspheres . The results of X-ray diffraction (XRD) revealed that Mn 2+ doping does not change the cubic phase of CaF 2 material but will lead to diffraction peaks shifting slightly towards higher angle due to the substitution of larger Ca 2+ by the relatively smaller Mn 2+ . Under the excitation of 980 nm continuous wave (CW) laser, these microspheres exhibit green-yellow-red tuning colors and remarkable enhancement of both red to green ratio (R/G) and red to blue ratio (R/B) when increasing Mn 2+ concentration from 0 to 30 mol%. The energy migration process between Ho 3+ and Mn 2+ was proposed and supported by time-decay and power dependence measurements of Ho 3+ UC emission. These upconversion materials may have potential applications in optical devices , color display, nanoscale lasers and biomedical imaging.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 32
·期 1
·1187-1196
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IF 2.22
Xu Wenhao,Liu Cheng,Shi Liang,Zhang Hongyang,Wang Gang,Zhang Xing,Zeng Rui,Zhang Huaiwu
Zn 1− x Mn x TiNb 2 O 8 (0.05 ≤ x ≤ 0.30) microwave dielectric ceramics were synthesized by the solid-state reaction method. The impacts of partial substitution of Mn 2+ for Zn 2+ on the crystal phase, crystal structure, grain morphology, and microwave dielectric properties were investigated in detail. Minor ixiolite phase of MnTiNb 2 O 8 was detected via the X-ray diffraction at higher x levels. Structural characteristics, such as porosity, packing fraction, and [Zn/Ti/NbO 6 ] octahedron distortion, were discussed to reveal the correlations between the microwave dielectric characteristics and the crystal structure. It was suggested that the permittivity was related to the porosity and the minor phase, while the quality factor was mainly determined by the packing fraction and relative density. The temperature coefficient of the resonant frequency was positively correlated with the distortion of [Zn/Ti/NbO 6 ] octahedron. Among all Zn 1− x Mn x TiNb 2 O 8 ceramics, the sample of x = 0.05 sintered at 1100 °C exhibited good microwave dielectric properties: ε r = 35.91, Q × f = 63,672 GHz (at 6.52 GHz), and τ f = − 68.68 ppm/°C, which provided an effective performance modulating approach for microwave dielectric ceramic design.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongfa Li,Wenjun Zhang,Chengyue Xin,Zihan Chen,Jian Sheng
Mn ions in different valence states can emit light of different colors in an octahedral coordination environment, which is conducive to the development of a single matrix with multi-color luminescence and applications in the field of anti-counterfeiting. The dual mode multi-color luminescent material CaSb 2 O 6 : Mn has been successfully synthesized using a single Mn source in the atmosphere. The CaSb 2 O 6 matrix itself can also absorb 285 nm UV light, emit blue light, and show a long afterglow phenomenon. Both Mn 4+ and Mn 2+ ions will appear in the [SbO 6 ] octahedra, whether the Mn source adopts MnCO 3 or MnO 2 . The Mn 4+ ion exhibits red emission upon UV excitation at 347 nm. The Mn 2+ ion can emit a bright green light at 285 nm excitation while exhibiting a long afterglow phenomenon. In this study, the Mn 2+ doped octahedron showed unique green emission and broadens the range of its photoluminescence (PL) wavelength. The performance of the material's long afterglow properties on the digital codes demonstrates its potential for dynamic anti-counterfeiting.
研究领域:
材料科学
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光学
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无机化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaowang Liu,Qiang Ji,Qiyan Hu,Chen Li,Meiling Chen,Jian Sun,Yu Wang,Qiang Sun,Baoyou Geng
Luminescent nanoparticles with dual-mode long-lived luminescence are of great importance for their attractive applications in biosensing, bioimaging, and data encoding. Herein, we report the realization of up- and downconversion emission of Mn2+ dopants in multilayer nanoparticles of NaGdF4:Yb/Tm@NaGdF4:Ce/Mn@NaYF4 upon excitation at 980 and 254 nm, respectively. The dual-mode emission of the Mn2+ dopants at 531 nm have a long-lived lifetime up to ∼30 ms as a result of the spin-forbidden optical transition of Mn2+ within the 3d5 configuration. After ceasing steady excitation at the two wavelengths, the long-lived feature of Mn2+ luminescence allows a longer persistent time than lanthanide emissions, thereby enabling the ease of data decoding by a cell phone camera under a burst mode. The long-lived green upconversion emission also permits the generation of a long green tail emission upon dynamic excitation at 980 nm. These attributes make the as-prepared Mn2+-doped multilayer nanoparticles particularly attractive for multilevel anticounterfeiting.
研究领域:
材料科学
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光学工程
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生物医学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Qiang Zhang,Shengbao Duan,Yinong Huang,Jingjing Tian,Jia Hu
By integrating the fluorescence of quantum dots (QDs) and Mn 2+ -pefloxacin mesylate (Mn 2+ -pefloxacin), a new type of dual-band fluorescence biosensor for high-efficiency and sensitive determination of double-stranded DNA (dsDNA) is developed. The biosensor is based on the fluorescence "OFF-ON" mode of both QDs and QDs-Mn 2+ -pefloxacin. The Mn 2+ -pefloxacin complex can quench the QDs fluorescence via photoinduced electron transfer (PET), and its fluorescence is also quenched. Due to the specificity and strong binding affinity of dsDNA for the Mn 2+ -pefloxacin complex, it can break the low fluorescent QDs-Mn 2+ -pefloxacin and restore the fluorescence of QDs and Mn 2+ -pefloxacin complex in their respective bands. Therefore, the dual-band fluorescence quantitative detection of dsDNA by QDs-Mn 2+ -pefloxacin can be achieved, while bovine serum albumin , single-stranded DNA, and bio-related ions do not yield similar results. Furthermore, the possible reaction mechanisms are systematically discussed. The detection limits (3δ/K) of herring sperm (hs) DNA in the fluorescence recovery bands of QDs and Mn 2+ -pefloxacin complex are 0.0142 and 0.0465 μg/mL, respectively. The developed biosensor was used for dsDNA detection in synthetic samples, and desirable results are obtained.
研究领域:
生物化学
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分子生物学
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分析化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2023
·Vol. 11
·期 18
·6220-6226
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IF 6.4
Dayu Huang,Ziyong Cheng,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The lattice defects that occur in material preparation processes are closely related to carrier migration. The carrier migration can be regulated by artificially modulating the defects to improve the luminescence performance, which is important for the development and application of luminescent materials. Here, we achieved a 3.29-fold increase in the high-temperature luminescence intensity by introducing Mn2+ to generate Cl vacancy defects in Cs2CdCl4. Due to thermally induced electron de-trapping, Cs2CdCl4:Mn2+ also displays anti-thermal quenching (ATQ) behavior and good thermal quenching resistance (329% at 175 °C). The increase in the photoionization effect and de-trapping of the captured electrons from shallow trap states were appropriately attributed to this exceptional phenomenon, based on thermoluminescence (TL) analysis. Based on comprehensive optical characterization, thermoluminescence and temperature-dependent X-ray diffraction (XRD), we reveal that the Cl vacancy trap state generated by Mn doping is the reason for the enhanced PL in air. The discovery of these materials helps to better understand the optical properties of all-inorganic perovskites.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 17
·1-9
·
IF 2.8
Xu Changyuan,Yin Hongming,Song Wenqiang,Wang Qun,Zhao Fengjiao
When employing the conventional melt quenching technique for the preparation of Mn 2+ -doped glasses, it is observed that Mn 2+ readily undergoes oxidation to Mn 3+ during high-temperature melting. Typically, researchers incorporate reducing agents into the synthesized raw materials or utilize a reducing atmosphere when preparing samples to mitigate this phenomenon. In this study, a novel approach was proposed to suppress Mn 2+ oxidation and enhance its luminescent properties. The zinc phosphoborate glasses based on 28.1P 2 O 5 –10.9B 2 O 3 –28.1ZnO (P–B–Zn) were prepared using the traditional melt quenching method. The effect of Cd 2+ on the red emission of Mn 2+ was studied by doping 2.9 mol% Mn 2+ and changing the concentration of Cd 2+ in the glasses. The analysis of photoluminescence emission (PL) spectroscopy and photoluminescence excitation (PLE) spectroscopy revealed a significant enhancement in the red emission resulting from the 4 T 1 (G) → 6 A 1 (S) transition of Mn 2+ under 409 nm excitation after doping with Cd 2+ ions. When the doping content of Cd 2+ is 19 mol%, the luminescence intensity of Mn 2+ reaches its maximum value, which is 4.24 times higher than that of undoped Cd 2+ . The results of the absorption and transmission spectra indicate a weakening of the 5 E g → 5 T 2g transition of Mn 3+ and an increase in the transparency of the glasses. The significant reduction in the absorption peak of Mn 3+ suggests that doping Cd 2+ can effectively inhibit the oxidation of Mn 2+ to Mn 3+ , as further confirmed by X-ray photoelectron spectroscopy (XPS) analysis.
研究领域:
材料科学
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光学
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DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-9
·
IF 3.8
Liu Yongtao,Duan Bin,Zhou Lin,Wu Yuxiang,Wang Fengyi,Ding Changchun,Hu Junshan
Here, this study reports single-band red upconversion emission in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor by doping Mn 2+ . The optimum concentration of Mn 2+ ions in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor was 0.20. The intensity of red and green emissions is increased by 27.4 and 19.3 times, respectively. Compared with the samples without Mn 2+ ions, the red-green integral strength ratio of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ sample was significantly increased by 28.4 times, reaching 110.9. The UCL mechanism was explored by analyzing the down-conversion luminescence spectra, absorption spectra, UCL spectra, and upconversion fluorescence lifetime decay curves of Yb 3+ /Er 3+ /Mn 2+ co-doped β-Ba 2 ScAlO 5 . The enhancement of upconversion red light is achieved through energy transfer between defect bands and Er 3+ ions, as well as energy transfer between Mn 2+ ions and Er 3+ ions. In addition, the Mn 2+ doped β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ red UCL phosphors have great potential for ambient temperature sensing in the 298–523 K temperature range. The maximum sensitivity of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ phosphor as a temperature sensor at 523 K is 0.0247 K −1 .
研究领域:
材料科学
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光学
✓ 已验证
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2018
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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.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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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.
研究领域:
生物医学工程
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分子诊断学
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癌症研究
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DOI
高影响因子
危险品化学品经营许可证（带存储）