JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 20
·15004-15008
·
IF 2.019
Cao Renping,Liu Xing,Bai Kailei,Chen Ting,Luo Zhiyang,Zheng Guotai,Ao Hui,Fu Jingwei
RMgPO 4 :Mn 2+ (R = Li, Na, and K) phosphors are synthesized by a solid-state reaction method in air. The crystal structures and luminescence properties are investigated. A broad emission band peaking at 638 nm of RMgPO 4 :Mn 2+ (R = Li and Na) phosphors with excitation 408 nm is observed in the range of 550–800 nm owing to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. KMgPO 4 :Mn 2+ phosphor with excitation 416 nm shows a broad emission band peaking at 658 nm in the range of 550–800 nm owing to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. The optimal Mn 2+ ion concentration in RMgPO 4 :Mn 2+ (R = Li, Na, and K) phosphors is about 5 mol%. The lifetimes of RMg 0.95 PO 4 :0.05Mn 2+ (R = Li, Na, and K) phosphors is ~6.21, 6.03, and 6.28 ms, respectively. The luminous mechanism is explained by Tanabe-Sugano diagram of Mn 2+ ion.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 2
·937-943
·
IF 6.788
Xupeng Gao,Xinyu Shen,Dingke Xue,Xin Li,Po Lu,Min Lu,Chunyan Li,William W. Yu,Xue Bai
Two-dimensional (2D) perovskites have become a research hotspot due to their large exciton binding energy and excellent stability. However, it is difficult to achieve longer wavelength emission than blue and green light in the 2D perovskites owing to their wide band gap resulting from their strong quantum confinement. Herein, we demonstrate a simple, efficient and low energy consumption crystallization method at room temperature to synthesize Mn2+ ion doped 2D (PEA)2PbBr4 nanocrystals (NCs) with dual-color emission centered at 410 nm from the exciton transition of the host and 600 nm from the d–d transition of Mn2+ ions. The periodic XRD peaks prove the formation of 2D perovskites. It is reassuring that the high PLQY of 54% has been achieved in the Mn2+ ion doped 2D (PEA)2PbBr4 NCs. The temperature-dependent and time-resolved spectra illustrate the efficient energy transfer from excitons to Mn2+ dopant ions. The realization of white LEDs with different color temperatures presents an opportunity and prospect for Mn2+ ion doped 2D perovskites in LED application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xiaoman Li,Ruijin Fan,Pengfei Zhai,Xinyu Liu,Huijun Liu,Shitong Xu,Rongfei Wei,Hai Guo
The demands for white-light-emitting materials are becoming more and more rigorous. In this work, a novel kind of Sn 2+ /Mn 2+ doped phosphate aluminum calcium glass was fabricated by a traditional melt-quenching technique. Broadband excitation and emission of Sn 2+ ions were detected in Sn 2+ single-doped glass samples. By the modulation of excitation wavelength, tunable broadband cyan-blue light emissions of Sn 2+ were also realized. Combined with the red light emitting of Mn 2+ ion, a nearly white light with a good chromaticity coordinate (0.339, 0.298) and a relatively low correlated color temperature (CCT) of 5107 K were obtained in Sn 2+ /Mn 2+ codoped glasses due to the energy transfer process from Sn 2+ to Mn 2+ ions. In addition, after two cycles of heating and cooling treatment, the emission intensity of Sn 2+ doped glass sample remained 97.9% of the initial emission intensity at 300 K. All of these results reveal that these Sn 2+ /Mn 2+ doped aluminum calcium phosphate glasses have good resistance to thermal impacts and have prospects in white-light-emitting diodes (W-LEDs) fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
矿物加工工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
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
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 21
·2400574
·
IF 8
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Wendong Nie,Zihao Wang,Maochun Hong
Transition metal ions, such as Cr 3+ , Fe 3+ , and Ni 2+ , are widely recognized activators for efficient broadband near-infrared (NIR) phosphors. However, the potential of Mn 2+ ions as NIR-emitting activators is relatively overlooked due to their typically narrowband emission in the visible spectral region and relatively weak absorption. Herein, a heavy Mn 2+ -doped Zn 1-x Al 2 O 4 : xMn 2+ (ZAO: xMn 2+ ) phosphor is presented that exhibits a single NIR emission band peaked at 830 nm with a bandwidth of 135 nm under excitation at 450 nm. Through comprehensive structural and spectral analysis, this NIR band is attributed to the emission originating from Mn 2+ ions within the MnO 6 octahedra. Importantly, the formation of Mn 2+ –Mn 2+ dimers breaks the spin-forbidden rule and significantly enhances the transition probability, as supported by the excited state dynamic analysis. Consequently, the optimal ZAO: 0.70Mn 2+ sample shows high internal/external photoluminescence quantum yields of 85.8%/36.9%, along with good thermal stability demonstrated by the emission intensity at 423 K retains 60% of that at 298 K. Finally, a prototype NIR pc-LED device is fabricated by combining ZAO: 0.70Mn 2+ phosphor with a 450 nm blue diode chip, generating an NIR output power of 28.84 mW at 100 mA. This study provides novel insights into high-performance Mn 2+ -activated NIR phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yayu Su,Xiaolei Li,Huiming Ji,Zhihao Zhao,Peng Zhang
The Ca 2+ -Mn 2+ doped LaAlO 3 was prepared by solid state reaction method, and the effects of different doping content of Ca 2+ and Mn 2+ ions on the infrared radiation properties of LaAlO 3 were investigated. The result showed that after doping Ca 2+ and Mn 2+ ions, the infrared radiation properties of LaAlO 3 significantly increased. When 40 mol% Ca 2+ and 50 mol% Mn 2+ ions were doped into LaAlO 3 , the average emissivity in the wavelength range of 1–22 µm was up to 0.90, which was higher than pure LaAlO 3 (0.71). The enhancement of infrared radiation properties of LaAlO 3 was mainly due to the decrease of band gap of LaAlO 3 , the increase of hole carriers absorption of energy, and the increase of lattice vibration absorption after doping Ca 2+ and Mn 2+ ions. Ca 2+ -Mn 2+ doped LaAlO 3 with high infrared radiation properties shows application prospect in the high temperature oxidation environment.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 6
·4139-4146
·
IF 1.339
He Enjie,Zheng Hairong,Gao Wei,Tu Yinxun,Lu Ying,Tian Huani,Li Guian
NaYF4:Yb3+, Er3+, Mn2+ nanocrystals with cubic crystal phase were obtained by a facile solvothermal method through doping a proper amount of Mn2+ ions to the nanocrystals. The results of XRD and TEM showed that the as-prepared samples
were well crystallized and their average size was about 25 nm. Under excitations at 978.5 nm and at 532 nm, obvious enhancement and regulation of upconversion and downconversion fluorescence were obtained. Upconversion emission spectra indicate that these effects were independent of doped
concentrations of Er3+ and Yb3+, excitation power, and the excitation wavelength in the current study. It is concluded that the enhancement of fluorescence emissions is mainly due to the change of local symmetry around Er3+ ions, while the regulation of red-to-green
ratios was caused by efficient energy transfer between Er3+ and Mn2+ ions. This kind of upconversion material has a great potential in bioimaging and drug delivery since the excitation and emission falls into the region of “optical window” of biological tissues.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Keqiang Chen,Dan Liu,Weiqi Lu,Kaihuai Zhuo,Guogang Li
Shelling with chalcogenides on the surface of lead halide perovskite (LHP) nanocrystals (NCs) is believed to be an effective approach to increase their stability under high-moisture/aqueous conditions, which is important for LHP NC-based optoelectronic devices. However, it is still a challenge to prepare high-quality LHP/chalcogenide core/shell NCs with moisture/aqueous stability. In this work, a surface-defect-induced strategy is carried out to facilitate the adsorption of Br– ions and subsequently Zn2+ ions to preform a bipolar surface, which reduces the energy barrier at the CsPbBr3/ZnS interface and promotes the epitaxial growth of the ZnS shell layer. The aqueous stability of the as-received NCs shows an increase of over 12 times compared to that of the original one. Likewise, Mn2+ ions are introduced to further reduce the geometric symmetry mismatch and defect density at the CsPbBr3/ZnS interface. Interestingly, aqueous stability characterizations illustrate negligible degradation even after 230 min of ultrasonication, suggesting their outstanding stability. This work proposes an effective approach to prepare high-quality LHP/chalcogenide core/shell NCs, which possess great potential in the fabrication of stable optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shihui He,Shiqiang Hao,Jiawei Lin,Na Wang,Jindong Cao,Zhongnan Guo,Christopher Wolverton,Jing Zhao,Quanlin Liu
The participation of organic cations plays an important role in tuning broad-spectra emissions. Herein, we synthesized a series of Mn(II)-based two-dimensional (2D) halide perovskites with arylamine cations of different lengths having the general formula (C6H5(CH2)xNH3)2MnCl4 (x = 1–4), with the x = 4 compound reported here for the first time. With the increase in the −(CH2)– in organic cations, the distance between adjacent inorganic layers increases, causing the title compounds to exhibit different structural distortions. As the Mn–Cl–Mn angular distortion increases, the experimental optical band gaps of the title compounds increase correspondingly. When the angle distortion between the octahedrons of the compounds is similar, the band gaps may also be affected by the distortion of the octahedron itself (the bond-length distortion of 2 is greater than that of 4). Under UV-light irradiation at 298 K, all of the compounds exhibit two emission peaks centered at 480–505 and 610 nm, corresponding to the organic-cation emission and the 4T1(G) to 6A1(S) radiative transition of Mn2+ ions, respectively. Among these title compounds, (PPA)2MnCl4 [(PPA)+ = C6H5(CH2)3NH3+] exhibits the strongest photoluminescence (PL). The study of the title compounds contributes to an in-depth understanding of the relationship between the structural distortion and optical properties of 2D Mn(II)-based perovskite materials.
研究领域:
材料科学
·
光电学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2022
·
IF 18.027
Feng Wu,Yaqian Du,Jiani Yang,Boyang Shao,Zhensheng Mi,Yuanfei Yao,Ying Cui,Fei He,Yanqiao Zhang,Piaoping Yang
The nanocatalytic activity of nanozymes provides a vision for tumor treatment. However, the glutathione (GSH)-related antioxidant defense system (ADS) formed on the basis of excessive GSH in the tumor microenvironment limits its catalytic activity. Here, dendritic mesoporous silica nanoparticles (DMSNs) were employed as nanocarrier; ultrasmall Fe3O4 nanoparticles, Mn2+ ions, and glutaminase inhibitor Telaglenastat (CB-839) were subsequently integrated into large mesopores of DMSNs, forming DMSN/Fe3O4–Mn@CB-839 (DFMC) nanomedicine. This nanomedicine exhibits peroxidase mimicking activities under acidic conditions, which catalyzes the decomposition of hydrogen peroxide (H2O2) into hydroxyl radical (•OH). This also promotes the formation of lipid peroxides, which is required for ferroptosis. Furthermore, this nanomedicine can effectively deplete the existing GSH, thereby enhancing reactive oxygen species (ROS)-mediated tumor catalytic therapy. Moreover, the introduced CB-839 blocks the endogenous synthesis of GSH, further enhancing GSH depletion performance, which reduces the excretion of oxaliplatin (GSH-related resistance) from tumor cells, thereby restoring the chemical sensitivity of oxaliplatin. The dual GSH depletion property significantly weakens the GSH-related ADS and restores the chemical sensitivity of oxaliplatin, leading to the high DFMC-induced apoptosis and ferroptosis of tumor cells. Our developed nanomedicine based on integrated nanotechnology and clinical drug may aid the development of tumor treatment.
研究领域:
纳米技术
·
癌症治疗
·
药学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）