JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Z.T. Chen,E.H. Song,M. Wu,S. Ding,S. Ye,Q.Y. Zhang
In contrast to common multiple upconversion (UC) emission characteristic from Ho 3+ , intense single-band red UC emission is realized in perovskite KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ nanocrystals via controlling the doping concentration ratio of Mn 2+ to Ho 3+ . Based on stokes emission, UC luminescence and energy levels of Mn 2+ and Ho 3+ , a bidirectional energy transfer from the 5 S 2 / 5 F 4 state of Ho 3+ to the 4 T 1 ( 4 G) state of Mn 2+ or | F 2 7 / 2 , T 4 1 ( G 4 ) 〉 state of Yb 3+ -Mn 2+ dimer, then to 5 F 5 state of Ho 3+ (ET2) is provided to explain the unique UC emission behaviors of KZnF 3 : Mn 2+ ,Yb 3+ ,Ho 3+ . The effects of dopant concentration on the UC luminescence properties of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ is investigated in detail. Analysis of the dominant red UC emission of KZnF 3 : Mn 2+ , Yb 3+ , Ho 3+ under different laser pulse width excitation indicates the energy transfer process . The special temperature dependent UC luminescence for Mn 2+ doped and Mn 2+ freely doped KZnF 3 :Yb 3+ , Ho 3+ further confirm the bidirectional energy transfer mechanism in the UC process. The study of these single-band red UC nanocrystals provides deep insights into the understanding of bidirectional energy transfer in UC mechanism, offering the possibility for applications in biolabels and bioimaging.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 129
·期 1
·69
·
IF 2.983
Deng Kaiyuan,Zhang Ruiting,Jin Yahong,Yuan Lifang,Wu Haoyi,Hu Yihua
A series of Mn 2+ -doped solid Zn 3 Ga 2 GeO 8 materials with far-red broad-band emissions is prepared as promising candidates for light emitting diodes (LEDs) for application in indoor plant cultivation. Phosphor exhibits broad far-red emissions, ranging from 600 to 1100 nm which overlap with the absorption range of the phytochrome ( \(P_{fr}\) ). In addition, the co-doping with Ca 2+ contributes a 1.57-fold increase in the far-red-emission intensity at room temperature. Encapsulating phosphor onto ultraviolet LED chips yields far-red-emitting LED devices, which can be promising candidates for promoting indoor plant cultivation.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hua Yu,Youjie Hua,Renguang Ye,Feifei Huang,Lei Lei,Degang Deng,Shiqing Xu
Here, BaAl 11 O 16 N: Mn 2+ green phosphor was synthesized by a two-step high-temperature solid-phase method, and its phase structure, morphology and photoluminescence properties were studied in detail. The phosphor has a wide excitation range of 240–500 nm, and the most effective excitation bands are in the blue spectral regions , indicating that BaAl 11 O 16 N: Mn 2+ green phosphor can be effectively excited by the commercial blue LED chip. Under the excitation of ultraviolet and blue light, the BaAl 11 O 16 N: Mn 2+ phosphor shows bright green light emission, with a peak of 514 nm and a half peak width of about 31 nm. The emission properties with temperature change show that the BaAl 11 O 16 N: Mn 2+ phosphor has good thermal stability and excellent color stability. The white light-emitting diode (a blue InGaN chip combined with BaAl 11 O 16 N: 0.25Mn 2+ phosphor and a commercial K 2 SiF 6 : Mn 4+ phosphor) exhibits a NTSC value of 119.3%. Therefore, it can be concluded that the BaAl 11 O 16 N: Mn 2+ phosphor the ideal choice for wide color gamut backlight as a potential efficient phosphor with green narrow-band emission.
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CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Xi Yuan,Sihang Ji,Michael C. De Siena,Liling Fei,Zhao Zhao,Yunjun Wang,Haibo Li,Jialong Zhao,Daniel R. Gamelin
A series of Mn2+-doped CsPbCl3 nanocrystals (NCs) was synthesized using reaction temperature and precursor concentration to tune Mn2+ concentrations up to 14%, and then studied using variable-temperature photoluminescence (PL) spectroscopy. All doped NCs show Mn2+4T1g → 6A1g d–d luminescence within the optical gap coexisting with excitonic luminescence at the NC absorption edge. Room-temperature Mn2+ PL quantum yields increase with increased doping, reaching ∼60% at ∼3 ± 1% Mn2+ before decreasing at higher concentrations. The low-doping regime is characterized by single-exponential PL decay with a concentration-independent lifetime of 1.8 ms, reflecting efficient luminescence of isolated Mn2+. At elevated doping, the decay is shorter, multiexponential, and concentration-dependent, reflecting the introduction of Mn2+–Mn2+ dimers and energy migration to traps. A large, anomalous decrease in Mn2+ PL intensity is observed with decreasing temperature, stemming from the strongly temperature-dependent exciton lifetime and slow exciton-to-Mn2+ energy transfer, which combine to give a strongly temperature-dependent branching ratio for Mn2+ sensitization.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光物理
·
半导体纳米材料
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Hua Yu,Renguang Ye,Huanping Wang,Shilong Zhao,Degang Deng,Shiqing Xu
Single doped Mg 0.388 Al 2 O 3.408 O 4 phosphor was prepared and multivalent Mn ion (Mn 2+ and Mn 4+ ) emission was achieved in a single host. The structure, morphology, and luminescence characteristics of Mn ions in Mg 0.388 Al 2 O 3.408 O 4 were discussed in detail, especially the temperature dependent emission characteristics of Mn ions. Based on the fluorescence intensity ratio (FIR) of Mn 2+ versus Mn 4+ and the decay lifetime of Mn 4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 293–473 K. The maximum relative sensitivities ( S r ) are derived as 2.83 % K −1 (at 373 K based on FIR) and 3.40 % K −1 (at 473 K based on decay lifetime), respectively. The temperature sensing characteristics of Mg 0.388 Al 2.408 O 4 : Mn 2+ /Mn 4+ powders in a full fiber system were studied, which can provide thermal-sensitive emissions at dual-wavelengths for stable ratiometric temperature sensing with good precision and repeatability. The constructed all fiber temperature sensing system has been applied in the on-line monitoring of CPU temperature.
研究领域:
光学传感器
·
发光材料
·
温度传感
·
光纤技术
·
荧光粉材料
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Science Advances
·
2026
·Vol. 12
·期 19
·
IF 13.9
Chuan Li,Xiu Hu,Rong Zhang,Shaoce Zhang,Huilin Cui,Qinshun Nian,Yuwei Zhao,Chunyi Zhi
In 1952, the first commercially alkaline Zn||MnO 2 primary battery was developed, which is based on Mn 4+ /Mn 3+ redox reactions (MnO 2 ↔Mn 2 O 3 ). Subsequently, the single-electron (Mn 3+ /Mn 2+ and Mn 7+ /Mn 6+ ) and two-electron (Mn 4+ /Mn 2+ ) redox reactions of Mn compound (Mn-Comp) were achieved in aqueous Zn-based batteries. After that, however, the new Mn multivalent change redox reaction was no longer observed. In this study, we report a neutral superhydrophilic hydrogel electrolyte that activates a Mn 2+ /Mn 7+ conversion reaction (Mn 2+ ↔MnO 4 − ). This advance is attributed to an expanding electrochemical stability window and high Mn 2+ reaction activity. This enables a discharge plateau of ≥2.2 V in aqueous Zn metal batteries. The high reversibility of Mn 2+ /Mn 7+ conversion reactions during cycling was achieved by incorporating chelation groups in the designed hydrogel electrolyte, which effectively stabilizes the MnO 4 − . The aqueous Zn||Mn-Comp battery with a 2.2-V discharge plateau operates stably for ≥360 hours.
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高影响因子
Small
·
2026
·
IF 11.8
Shuzeng Zhang,Ruchun Zhao,Aocheng Feng,Yang Ding,Chenxu Zhu,Zhixue Li,Meijiao Liu,Xiao-Yun Li,Chunhua Wang,Jiasong Zhong
Long-afterglow phosphors have garnered significant attention in optical storage due to their persistent luminescence arising from intrinsic atomic defects. However, introducing additional defect states to enhance afterglow intensity while maintaining satisfactory luminescence emission remains a major challenge, let alone understanding the correlation between structural defects and luminescence/afterglow performance. This study successfully demonstrates that Mg 2+ doping effectively induces structural disorder in LiGa 5 O 8 :Mn 2+ (LGO:Mn 2+ ) spinel, simultaneously enhancing its photoluminescence and long afterglow emission performances. The experimental and theoretical calculation results indicate that a higher Mg 2+ doping ratio promotes spinel structural disorder and local lattice distortion. Specifically, the hybridization between Mg 2+ (3s/3p) and O 2− (2p) orbitals enhances energy transfer efficiency to Mn 2+ activators while suppressing concentration quenching effects. Furthermore, the local lattice distortion accelerates oxygen vacancy formation, introducing more active sites capable of capturing electrons and increasing the “charge capacity.” Demonstrating remarkable luminescence and afterglow emission properties, the synthesized LGO:Mn 2+ , Mg 2+ phosphor successfully extends its application to optical information storage and magnesium-bearing ore detection. The disorder engineering strategy proposed herein provides profound insights into the structure-optical property relationship of spinel phosphors, offering novel concepts and approaches for designing advanced luminescent materials suitable for multifunctional optoelectronic applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jun-Cheng Zhang,Xu-Yan Xue,Yi-Fei Zhu,Shanshan Wang,Hong-Wei He,Xu Yan,Xin Ning,Di Wang,Jianrong Qiu
Energy-storage mechanoluminescent (ML) materials have shown promising prospects in stress sensing, lighting and displays due to the outstanding structural integrity and luminescent reproducibility. However, such ML materials universally encounter limitations in achieving long-delay sustainability, cyclic-stimulation stability and centrosymmetric-lattice availability. Herein, we report a new ML material NaCa 2 GeO 4 F:Mn 2+ with centrosymmetric structure, whose ML properties show ultra-long-delay sustainability (up to a delay of 144 h), short-term-friction stability and high image contrast. The experimental and theoretical investigations indicate that these unique ML characteristics arise from the formation of deep traps. These deep traps can stably store a certain proportion of electrons at ambient temperature for a long time, and provide electronic supplement to shallow traps released under mechanical friction. The excitation mechanism of captured electrons under mechanical stimuli is attributed to the local triboelectric field caused by triboelectricfication. We also demonstrate the availability of the developed ML material in mechanically triggered display and time-resolved security encryption. Our results may provide new insights for developing high-performance energy-storage ML materials and promoting practical applications of such materials.
研究领域:
材料科学
·
发光材料
·
固态化学
·
功能材料
·
纳米能源
·
传感器技术
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 6
·2095-2102
·
IF 8.067
Guojun Zhou,Jialiang Ding,Xingxing Jiang,Jian Zhang,Maxim S. Molokeev,Qiqiong Ren,Jun Zhou,Shili Li,Xian-Ming Zhang
Organic–inorganic metal halides have become a multifunctional platform for manipulating photoluminescence due to highly efficient and tunable emissions, especially for lead-free Mn2+-based halides. Herein, the zero-dimensional (0D) bromides of (C5H14N3)2MnBr4 and (CH6N3)2MnBr4 with different coordination environments were designed and synthesized by a solvent evaporation method. They exhibit green and red broadband emission peaks at 528 nm and 627 nm with high photoluminescence quantum yields of 86.83% and 61.91%, respectively, which are attributed to the d–d transition (4T1(G) → 6A1(S)) of [MnBr4]2− tetrahedral and [Mn3Br12]6− octahedral units. The cases emphasize the effect of organic ligands on the intrinsic emissions of Mn2+ ions, thereby revealing the luminescence mechanism of Mn2+ ions in 0D isolated structures through the Tanabe–Sugano (TS) energy diagram. Thanks to their bright and stable emissions, the fabricated white light-emitting diode (LED) based on (C5H14N3)2MnBr4 and (CH6N3)2MnBr4 provides an outstanding color rendering index (Ra) of 90.8 at a correlated color temperature (CCT) of 3709 K, along with the CIE chromaticity coordinates of (0.3985, 0.3979) and a luminous efficacy of 51.2 lm W−1. This work aims at clarifying the relationship between the coordination units of Mn2+ and tunable emissions, and in particular, proposes a new strategy to explore phosphors excited by blue light for white LEDs.
研究领域:
材料科学
·
光学
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 6
·2162-2168
·
IF 6.4
Ke Liu,Ting Wen,Chen Li,Yingying Ma,Dequan Jiang,Binbin Yue,Yonggang Wang
Single-phase phosphors with emissions covering the whole visible spectra are a superior strategy for efficient generation of white light, in which the color rendering index/correlated color temperature indices can be conveniently regulated by means of the energy transfer process between sensitizer/activator ions. In this paper, we report pressure regulation of the photoluminescence performance and energy transfer process between Eu2+–Mn2+ ions in Sr5(PO4)3Cl:0.02Eu2+, xMn2+ phosphors under high pressure. The Raman spectra under pressure show signs of local symmetry phase transitions around 7 GPa. Along with this phase transition, significant divergence arises between Sr5(PO4)3Cl:0.02Eu2+, 0.04Mn2+ and its counterpart without Mn2+ ions, with regard to features such as redshift of the emission spectra, luminescence intensity and lifetime decay. The efficiency of the energy transfer exhibts an interestingly inverse tendency with respect to the pressure, before and after the phase transition. Pressure manipulation generally results in steerable luminescence color, and can produce emission of white light. Our study offers insights into the photophysical properties of energy transfer under pressure, and also provides more understanding of controlled regulation of luminescence.
研究领域:
材料科学
·
发光材料
·
高压物理
·
光学性质
·
固态化学
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高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2023
·
IF 7
Fan Yang,Shuqi Liu,Zhonghuan Tian,Yujie Du,Deyao Zhang,Chao-an Long
Edetate salts are a kind of food additive regarded as candidates for chemical fungicides because of their lower toxicity and higher safety for the environment and human health. The antifungal activities of edetate salts have been determined in some phytopathogens except Penicillium digitatum , which causes the most destructive fungal disease during the citrus postharvest period. In the present study, we investigated the molecular mechanisms of calcium disodium edetate (EDTA-Na 2 Ca) against P. digitatum in deepth. The results suggested that EDTA-Na 2 Ca inhibited the P. digitatum P44 strain in vitro at a minimum inhibitory/fungicidal concentration (MIC/MFC) of 50 mmol L −1 . Meanwhile, EDTA-Na 2 Ca also inhibited P. digitatum in vivo by enhancing the host defense system. The P44 strain treated with EDTA-Na2Ca displayed a delayed conidial germination rate, expanded hyphal tips, thickened septa and cell walls, and destroyed mitochondria. Transcriptome sequencing and qRT-PCR analyses indicated that EDTA-Na 2 Ca suppressed the P44 strain primarily by disturbing the carbohydrate metabolism pathway, especially the synthesis of pyruvate in glycolysis. In addition, the adverse effects, including those on mycelial growth, pyruvate synthesis and superoxide dismutase activity, of EDTA-Na 2 Ca could be reversed by exogenous Mn 2+ , implying that Mn 2+ chelation is an essential mode of action. In summary, the current work verifies that EDTA-Na 2 Ca is a potential antifungal drug that cures citrus green mold probably by chelating Mn 2+ and targeting pyruvate synthesis in P. digitatum .
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhao Wang,Yurou Wang,Yuxuan Lin,Gang Bian,Hai-Yang Liu,Xiang Li,Jun Yin,Jian Zhu
Aqueous zinc-ion batteries (ZIBs) have gained wide attention for their low cost, high safety, and environmental friendliness in recent years. β-MnO2, a potential cathode material for ZIBs, has been restricted by its small channels for efficient charge storage. Herein, β-MnO2 nanorods with oxygen vacancies are fabricated by a K+-doping strategy to improve the performance of ZIBs. The assembled batteries exhibit a capacity of 468 mAh g–1, a power density of 2605 W kg–1, and an energy density of 179 Wh kg–1, which outperforms most reported ZIBs. Such a performance is owing to the synergistic combination of the oxygen vacancies in β-MnO2 and concurrent deposition of ε-MnO2 from Mn2+ in the electrolyte. Furthermore, superior cycling stability with negligible capacity decay in these batteries is demonstrated over 1000 cycles at a high current of 2 A g–1. This study reveals the importance of oxygen vacancies and Mn2+ deposition effect in understanding the mechanism of charge storage in MnO2-based ZIBs.
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高影响因子
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