CHEMOSPHERE
·
2022
·
IF 8.943
Xinyue Gu,Chen Tan,Lixian He,Jie Guo,Xia Zhao,Kezhen Qi,Ya Yan
In this work, AgInS 2 and Mn 2+ doped AgInS 2 (Mn–AgInS 2 ) with different Mn 2+ : (Ag + + In 3+ ) ratios were synthesized via a low temperature liquid method. The photocatalytic activity of the obtained samples was followed by taking formaldehyde as the target pollutant under visible light irradiation. The photocatalysts were passed through various characterization procedures to investigate their morphological, structural and photophysical characteristics. The optimal proportion sample [with the ratio n (Mn 2+ ): n (Ag + + In 3+ ) = 1:100] photodegraded about 79% formaldehyde in 150 min. These upgraded activities are attributed to the enhanced visible light absorption and superior charge separation due to the presence of Mn 2+ as confirmed site from charge separation measurements. In addition, a possible mechanism for the photodegradation of formaldehyde is proposed based on the experimental results. Furthermore, the photocatalytic water splitting performance of Mn–AgInS 2 and multi-walled carbon nanotubes (MWCNTs) modified Mn–AgInS 2 is investigated and compared under simulated sunlight irradiation, and remarkable hydrogen production is achieved (105 μmol h −1 g −1 ) by using the latter.
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Advanced Optical Materials
·
2023
·Vol. 11
·期 20
·2300623
·
IF 9
Zhihao Wang,Bohan Wang,Xiping Zeng,Dengfeng Peng,Yu Wang
Current luminescence materials are abundantly available for visualization fields on a theoretical level, while the lack of luminescent intensity has largely hindered their practical application. Here, the substantial enhancement of the multimode luminescence is demonstrated including mechanoluminescence (ML), photoluminescence (PL), and X-ray excited optical luminescence (XEOL) for Mn 2+ and Tb 3+ in zinc calcium oxysulfide (CaZnOS) by increasing the concentration of oxygen vacancies (OVs). Through a comprehensive structure analysis, it is found that the CaZnOS lattice has a tolerance of 60% of Sr 2+ with respect to Ca 2+ in the methodology. The experimental characterizations verified that the lattice distortion of CaZnOS originating from Sr 2+ incorporation can efficiently promote the elimination of oxygen elements and simultaneously produce more OVs in the matrix, which can effectively fortify the trapped electrons and ultimately promote stronger luminescence. The ML, PL, and XEOL achieve around two to six times’ enhancement after Sr 2+ incorporation. The findings provide insight into mechanisms underlying the luminescence behavior change of phosphors after cation substitution and may have wide implications for the practical application of intrinsically defective phosphors.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Zihao Wang,Jiajun Yu,Fei Tang,Changcheng Zheng,Lizhen Zhang,Kangzhen Tian
A sol-gel process together with a low-temperature sintering technique was applied for preparing Mn 2+ activated Li 2 MgSiO 4 green phosphor. Phase structure information was derived from the Rietveld refinement on its powder X-ray diffraction pattern . The luminescence performance was evaluated by characterizing the photoluminescence (PL) spectral evolution with Mn 2+ concentration and in the temperature range of 300–500 K. The optimal Mn 2+ doping level was 4 at% and the main PL quenching mechanism was identified to be the electric dipolar-dipolar interaction. The temperature-dependent PL spectra showed broad asymmetric line-profiles, and the underlying phonon effect was revealed from both experimental and theoretical works. The predominant phonon energy was determined to be 25 meV, and the luminescence quenching at high temperatures was mainly attributed to the six-phonon coupling interaction with the Mn 2+ optical center, which was further confirmed from the simulation on PL spectral lineshape. These obtained results may provide us an unprecedented approach to study the phonon effect on the luminescence characteristic for the phosphors.
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CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Guojun Zhou,Xingxing Jiang,Maxim Molokeev,Zheshuai Lin,Jing Zhao,Jing Wang,Zhiguo Xia
Finding new low-dimensional metal halides with broad-band emission is attracting interest in single-component phosphor for white light-emitting diodes (WLEDs). The full-spectrum white light still remains a challenge as found in the two-dimensional hybrid material (C6H18N2O2)PbBr4 exhibiting the intrinsic free exciton (FE) and broad-band self-trap exciton (STE) emission upon 365 nm ultraviolet excitation, and a combined strategy has been proposed through doping the Mn2+ ions enabling a superposition of multiple emission centers toward the ultra-broad-band warm white light. The occupation of Mn2+ in (C6H18N2O2)PbBr4 has been discussed, and optical investigations verify that the warm white-light emission of Mn2+-doped (C6H18N2O2)PbBr4 originates from the coupling effects of the FE, STEs, and the 4T1–6A1 transition of the doped Mn2+. When the concentration of Mn2+ is 5%, the emission spectrum of the phosphor covers all visible-light areas with a full width at half maximum (FWHM) of about 230 nm. The high Ra (84.9) and warm light CCT (3577 K) values of the as-fabricated WLED lamp demonstrate that (C6H18N2O2)Pb1–xMnxBr4 can be promising as single-component white-light phosphor in solid-state lighting. Our work could provide a new understanding and perspective about hybrid metal halides for designing superior phosphor toward single-component white emission.
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DYES AND PIGMENTS
·
2018
·
IF 3.767
Yuchi Zhang,Hanzhi Yao,Yan Xu,Zhiguo Xia
Engineering novel ratiometric temperature sensors with high temperature sensitivity is still of a great challenge in versatile temperature measurement fields. Herein, a self-calibrated optical luminescent thermometer based on Eu 3+ /Mn 2+ dual-activator was fabricated in the same nanocomposite system, which integrated the photoluminescence originated from the temperature-insensitive Eu-metal organic framework with weak coupling effect and the temperature-sensitive Zn 2 GeO 4 :Mn 2+ with strong coupling effect. Specifically, the as-prepared nanocomposites composed of lanthanide MOF Eu-BTC (BTC = 1,3,5-benzenetricarboxylic acid) and Zn 2 GeO 4 :Mn 2+ nanorods possessed Eu 3+ /Mn 2+ dual red/green emission, which displays excellent ratiometric temperature-sensing functions and also has high relative sensitivity ( S r ) of 4.1% ºC −1 when they are used as ratiometric luminescent thermometer in the physiological temperatures (25–45 °C). These results demonstrate that such a design strategy with synergistic weak/strong coupling luminescence is useful and the as-obtained Eu-MOF/Zn 2 GeO 4 :Mn 2+ nanocomposites can be potential for temperature sensor applications.
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Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 20
·5183-5191
·
IF 4.696
X. Y. Liu,H. Guo,S. Ye,M. Y. Peng,Q. Y. Zhang
Zinc borate oxyfluoride glasses containing silver ions (Ag+), Ag nanoclusters and manganese ions (Mn2+) have been successfully prepared using the melt-quenching method. Their structure and luminescent properties were evaluated using transmission electron microscopy (TEM), absorption measurements, steady and time-resolved photoluminescence spectra and fluorescence lifetime measurements. Benefitting from the unique excitation/emission characteristics of Ag nanoclusters in the matrix, the Ag singly doped glass exhibited intriguing wavelength dependent, broad band luminescent performance. After Mn2+ ions were built into the singly doped sample, the emission band was extended to white emission and the intensity was enhanced 13 times with a maximal quantum yield of 24.9%. It was demonstrated experimentally that dual-mode energy transfer does occur from isolated Ag+ and (or) Ag nanoclusters to Mn2+. At the same time, the addition of Mn2+ substantially promotes the formation of Ag nanoclusters. Direct spectroscopic evidence as well as the assumed mechanism have been presented for these processes. This research may help to devise a new perspective for the use of noble metal nanoclusters and transition metals in designing broad band tunable light source.
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International Journal of Nanomedicine
·
2017
·
IF 4.3
Juqun Xi,Lanyue Da,Changshui Yang,Rui Chen,Lizeng Gao,Lei Fan,Jie Han
Nanoparticle drug delivery carriers, which can implement high performances of multi-functions, are of great interest, especially for improving cancer therapy. Herein, we reported a new approach to construct Mn 2+ -coordinated doxorubicin (DOX)-loaded poly(lactic- co -glycolic acid) (PLGA) nanoparticles as a platform for synergistic chemo-photothermal tumor therapy. DOX-loaded PLGA (DOX/PLGA) nanoparticles were first synthesized through a double emulsion-solvent evaporation method, and then modified with polydopamine (PDA) through self-polymerization of dopamine, leading to the formation of PDA@DOX/PLGA nanoparticles. Mn 2+ ions were then coordinated on the surfaces of PDA@DOX/PLGA to obtain Mn 2+ -PDA@DOX/PLGA nanoparticles. In our system, Mn 2+ -PDA@DOX/PLGA nanoparticles could destroy tumors in a mouse model directly, by thermal energy deposition, and could also simulate the chemotherapy by thermal-responsive delivery of DOX to enhance tumor therapy. Furthermore, the coordination of Mn 2+ could afford the high magnetic resonance (MR) imaging capability with sensitivity to temperature and pH. The results demonstrated that Mn 2+ -PDA@ DOX/PLGA nanoparticles had a great potential as a smart theranostic agent due to their imaging and tumor-growth-inhibition properties.
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Chemical Science
·
2024
·
IF 7.6
Qianrong Jin,Rui Wu,Yuexiao Pan,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
The burgeoning demand for materials with tunable photoluminescence properties for applications has necessitated the exploration of novel luminescent materials. This study presents the synthesis and characterization of a novel 0D organic–inorganic hybrid metal halide (OIHMH) single crystal, C6H14N2CdBr4, which exhibits intriguing luminescent properties upon Mn2+ doping. The introduction of single Mn2+ ions results in a dual-emission, with the unexpected emergence of a red emission peak at 627 nm, in addition to the conventional tetrahedral green emission at 525 nm. This dual-emission is attributed to the distinct inter-tetrahedral distances within the crystal structure of C6H14N2CdBr4 with varying distances between [CdBr4]2− tetrahedra, influencing the spatial distribution and interaction of the [MnBr4]2− tetrahedra. Electron paramagnetic resonance (EPR) spectroscopy and theoretical calculations reveal the 627 nm and 525 nm emissions are attributed to the d–d transition of magnetic coupled Mn2+–Mn2+ pairs and isolated Mn2+ ions, respectively. This study not only advances the understanding of the luminescence mechanisms of Mn2+ but also paves the way for the development of tunable luminescent materials.
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NANOTECHNOLOGY
·
2024
·Vol. 36
·期 9
·095203
·
IF 2.9
Xiaozong Huang,Wen Li,Linghang Kong,Xiaoyan Lu,Chengzhi Yang,Bingsuo Zou
Due to the easy transformation to the non-luminous yellow δ-CsPbI3 phase in air, α-CsPbI3 nanocrystalline materials with red light emission find limited applications. Lifting its structural stability is a challenge in its quantum dot (QD) lighting field. Here we studied the doping of Mn2+ ions (5.0%) and processing by a small amount (0.315 ml) of TOP molecules on the OA-capped CsPbI3 nanocrystals. It is found that after the successful introduction of Mn2+ into the CsPbI3 nanocrystal, the grain size reduces, which leads to a stronger quantum confinement effect than the undoped QDs, which leads to the blue shift of PL and absorption spectra. The incorporation of Mn2+ simultaneously reduced defects and lifted the luminescence efficiency and lifetimes of QDs, the cause for the above optical behavior is due to the formation of excitonic magnetic polaron (EMP) excitons near the bandedge. On the other hand, the treated TOP molecule on the OA-capped NCs did not significantly affect their room-temperature luminescence. However, it improved the low-temperature emission performances of QDs significantly. Moreover, the TOP-treated QDs fixed in the PMMA film can transform into rod-like shapes in acidic environments, giving strong stability for emission, especially for the Mn-doped CsPbI3 QDs. This work has been done to improve the stability and emission efficiency of related QDs through the EMP formation near band-edge and surface modification of CsPbI3 NCs, favoring their potential applications in display and low-temperature light-emitting devices.
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Chemistry-An Asian Journal
·
2024
·Vol. 19
·期 24
·e202400798
·
IF 3.5
Haiyun Zhou,Pingping Li,Tingting Zhong,Yunzhen Teng,Siqi Li,Xiaofeng Luo,Xinning Wang,Min Yang,Guowei Deng
Mn doping has been used to improve the physical chemistry of lead halide perovskite nanocrystals such as CsPbX 3 , where X is a halogen ion. In this paper, a two-phase method for Mn-doped CsPbX 3 nanosheets (where X=Br, Cl), namely water-hexane system, is reported. Compared to conventional catalyst arrays, the band gap of CsPbBr 3 nanocrystalline is easily tuned, the carrier diffusion distance is remote, the band edge position of the band structure is favorable for a wide range of electrocatalytic redox reactions, and the catalytic active site is maximally exposed, providing a larger electrolyte contact area. The porous hierarchical structure also accelerates the release of hydrogen bubbles. The results showed that the optimized Mn : CsPbBr 3 catalyst exhibited excellent electrolytic performance of aquatic hydrogen in alkaline electrolyte (1 mol/L KOH). The overpotentials of the oxygen evolution reaction (OER) at the current densities of 10 and 100 mA cm −2 are only 114.4 and 505.4 mV, respectively, with a Tafel slope of 43 mV dec −1 . At a current density of 10 mA cm −2 , the excess potential required for the hydrogen evolution reaction (HER) is 158.6 mV and it exhibits excellent electrochemical stability. The Mn : CsPbBr 3 nanocrystalline consists of two electrodes for hydrolysis of water, requiring only a voltage of 1.45 V. This provides implications for the optimization of electrocatalysts in alkaline electrolytes with the aim of developing next generation 2D electrocatalysts for overall water splitting.
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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.
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TALANTA
·
2017
·
IF 4.162
Yaoyao Zhou,Bo Ling,Hongqi Chen,Lun Wang
A novel fluorescence method for the determination of hydrogen peroxide (H 2 O 2 ) and uric acid (UA) was developed. The procedure was based on the hydroxyl radicals (·OH), which effectively quenched the fluorescence of the Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles (UCNPs). Based on the property of Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles, the Fenton reaction and enzymatic reaction of uric acid, this method could be used for highly sensitive detection of H 2 O 2 and uric acid. Under optimal conditions, we observed that the fluorescence quenching signal showed good linearity with the H 2 O 2 concentration in the range of 3.00 × 10 -8 M ~ 6.00×10 -5 M, and the detection limit of this assay was 1.30×10 -8 M. Meanwhile, the linear concentration range for UA was 4.00 × 10 -9 M ~ 1.00×10 -5 M, and the lower limit of detection was 1.90×10 -9 M. Furthermore, the developed method was successfully used for the determination of UA levels in human serum with satisfactory results.
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