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Evolution of anomalous Hall effect in ferromagnetic Weyl semimetal Nb_(x)Zr_(1-x)Co_(2)Sn

Chinese Physics B 2024年第8期33卷 491-496页

作者：陈博文沈冰 Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen UniversityGuangzhou 510275China

Magnetic topological semimetal can host various topological non-trivial states leading to exotic novel transport *** we report the systematic magneto-transport studies on the Heusler alloy Nb_(x)Zr_(1-x)Co_(2)Sn considered as a ferromagnetic(FM)Weyl *** cusp anomaly of temperature-dependent resistivity and large isotropic negative magneto-resistivity(MR)emerge around the FM transition consistent with the theoretical half-metallic *** prominent anomalous Hall effect(AHE)has the same behavior with the applied field along various crystal *** Nb doping introduces more disorder resulting in the enhancement of the upturn for the temperature-dependent resistivity in low *** Nb doping,the AHE exhibits systemic evolution with the Fermi level *** the doping level of x=0.25,the AHE mainly originates from the intrinsic contribution related to non-trivial topological Weyl states.

关键词： anomalous Hall effect magnetic Weyl semimetal ferromagnetism

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In situ protonation in a locally flexible porous coordination polymer for enhancing proton-carrier loading and proton conductivity

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Science China Chemistry 2024年第10期67卷 3432-3437页

作者： Xianzhe Wei Jincheng Liu Yan Su Weitao Wang Guixiang Wang Gen Zhang Ping Wang Cheng Gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China

Designing efficient proton-conductive materials is crucial in fuel ***,it remains a substantial challenge because of the issues in proton mobility,proton-carrier amount,and orientation of proton host ***,we report an in-situ protonation strategy to produce a locally flexible porous coordination polymer(PCP)to enhance the proton-carrier loading and proton *** local dipole flipping of the ligand allows effective proton exchange with low activation energy,promoting interpore proton transport through the pore apertures and pore *** protonation induces substantial charges to the frameworks and enhances the interaction with proton carriers,thereby increasing the loading of the proton *** this design strategy,the resulting PCP exhibits enhanced phosphoric acid loading and extraordinary proton conductivities under both aqueous and anhydrous conditions compared to its isoreticular analog that features rigidity without proton-exchange *** work provides a new avenue for designing proton-conductive materials that combine structural dynamics with performance merits.

关键词： porous coordination polymers in-situ protonation local flexibility proton-exchange mechanism proton conduction

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Ligand Engineering Achieves Suppression of Temperature Quenching in Pure Green Perovskite Nanocrystals for Efficient and Thermostable Electroluminescence

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Nano-Micro Letters 2025年第4期17卷 25-38页

作者： Kaiwang Chen Qing Du Qiufen Cao Chao Du Shangwei Feng Yutong Pan Yue Liang Lei Wang Jiangshan Chen Dongge Ma Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy&Information Polymer MaterialsState Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence From Molecular AggregatesSouth China University of TechnologyGuangzhou 510640People’s Republic of China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Formamidinium lead bromide(FAPbBr_(3))perovskite nanocrystals(NCs)are promising for display and lighting due to their ultra-pure green ***,the thermal quenching will exacerbate their performance degradation in practical applications,which is a common issue for halide ***,we reported the heat-resistant FAPbBr_(3)NCs prepared by a ligand-engineered room-temperature synthesis *** aromatic amine,specificallyβ-phenylethylamine(PEA)or 3-fluorophenylethylamine(3-F-PEA),was incoporated as the short-chain ligand to expedite the crystallization rate and control the size distribution of FAPbBr_(3)*** this ligand engineering approach,we synthesized high quality FAPbBr_(3)NCs with uniform grain size and reduced long-chain alkyl ligands,resulting in substantially suppressed thermal quenching and enhanced carrier transportation in the perovskite NCs *** notably,more than 90%of the room temperature PL intensity in the 3-F-PEA modified FAPbBr_(3)NCs film was preserved at 380 ***,we fabricated ultra-pure green EL devices with a room temperature external quantum efficiency(EQE)as high as 21.9%at the luminance of above 1,000 cd m^(-2),and demonstrated less than 10%loss in EQE at 343 *** study introduces a novel room temperature method to synthesize efficient FAPbBr_(3)NCs with exceptional thermal stability,paving the way for advanced optoelectronic device applications.

关键词： Perovskite nanocrystals Ligands engineering Thermal quenching Ultra-pure green emission Light-emitting diodes

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Unfused-ring Acceptors with Dithienobenzotriazole Core for Efficient Organic Solar Cells

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Chinese Journal of Polymer Science 2022年第12期40卷 1586-1593,I0007页

作者： Zui-Yi Zhong Jia-Xin Xu Kai Zhang Ming-Hao Dong Qi-Ri Huang Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In recent years, non-fullerene acceptors(NFAs) with unfused-ring structure have received extensive attention due to their flexible combination of building blocks and relatively simple synthetic routes. In this work, three new A-D-C-D-A type unfused-ring acceptors(UFAs),named DTBTz EH-IC2F, DTBTz Me-IC2F and DTBTz Me-IC2Cl, were designed and synthesized with dithienobenzotriazole(DTBTz) as the *** modification of alkyl chain on the DTBTz unit and change of halogen atoms on the cyanoindanone end groups, the differences in optoelectronic properties of these three small molecule acceptors were investigated. The results show that changes in alkyl chain and halogen atom endow UFAs with different features, including shift in absorption, changes in energy level and molecular packing. When blended with donor PBDB-T, the organic solar cell based on DTBTz Me-IC2Cl achieves the highest device efficiency of 12.3%, while DTBTz EH-IC2F-based device obtains 11.5% efficiency and DTBTz Me-IC2F-based device obtains 12.0% efficiency. The stability tests show that all the devices obtain good efficiency retention rates. These results demonstrate that the introduction of a rigid aromatic ring DTBTz as an intermediate core not only effectively results in highly planar A-D-C-D-A small molecules, but also provides a new reference for the design and development of UFAs in OSCs.

关键词： Organic solar cells Non-fullerene acceptors Unfused-ring

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Sulfur poisoned PtNi/C catalysts toward two-electron oxygen reduction reaction for acidic electrosynthesis of hydrogen peroxide

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Journal of Materials Science & technology 2025年第1期204卷 268-275页

作者： Xin Yang Lijie Zhong Songxin Ye Dequan He Shuxian Yuan Huixin Li Yuting Ma Xiaocheng Mo Shiyu Gan Li Niu Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials&DevicesGuangdong Engineering Technology Research Center for Photoelectric Sensing Materials&DevicesKey Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial UniversitiesSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China School of Chemical Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

Selective electrocatalysis of two-electron oxygen reduction reaction(2e^(-)ORR)has been recognized as a sustainable and on-site process for hydrogen peroxide(H_(2)O_(2))*** progress has been achieved for 2e^(-)ORR in alkaline ***,it is challenged by insufficient activity and selectiv-ity of the catalysts in acidic ***,we report sulfur-poisoned PtNi/C catalysts(PtNiSx/C)that could regulate ORR from the 4e^(-)to 2e^(-)*** identified PtNiS0.6/C offers high activity in terms of onset potential of∼0.69 V(***)and∼80%*** mass activity is also compara-ble and outperforms representative Pt-based precious and transition-metal-based *** addition,it is interestingly found that the Faradaic efficiency further increased to 95%during the long-term elec-trolysis test due to Ni atom surface *** electrochemical production of the H_(2)O_(2)system was applied to the electro-Fenton process,which has realized the effective degradation of organic *** work offers a strategy by sulfur poisoning PtNi/C catalyst to realize Pt-based 2e^(-)ORR active catalysts to electrolysis of H_(2)O_(2)in acidic media.

关键词： Oxygen reduction reaction Hydrogen peroxide Acidic media Electrocatalysis

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Highly efficient mechanoluminescence of SrAl2–xYxO4:Eu2+,Dy3+ via trap regulation for dynamic signature anticounterfeiting

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Journal of Rare Earths 2025年第6期43卷 1133-1139页

作者： Zhang, Xinlian Li, Panpan Li, Jing Li, Lulu Xu, Shiqing Zhang, Junjie Institute of Optoelectronic Materials and Devices College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China State Key Laboratory of Luminescent Materials and Devices School of Physics and Optoelectronics South China University of Technology Guangzhou510641 China

Mechanoluminescence (ML) materials have shown tremendous application potential due to their luminescent properties stimulated by mechanical energy. Owing to the narrow awareness of alterations in the crystal field environment of materials, the ML performance optimization is severely restricted. Here, a novel strategy of doping Y3+ into SrAl2O4:Eu2+,Dy3+ phosphors was employed by solid-phase reaction, significantly improving the ML performance. Based on analysis of structure and luminescent properties, it is proved that Y3+ occupies Al3+ sites, causing lattice expansion and crystal field distortion, altering trap engineering, strengthening carrier de-trapping ability, and improving ML performance. Through thermoluminescence (TL) analysis, the brighter ML behavior can be attributed to the carriers re-combination generated by high-density deep traps of 0.836 eV and above. Materials were also investigated in relation to pressure, stability and repeatability and conducive to achieving dynamic anticounterfeiting of personal signature. This study also provides more evidence that doping ions is an efficient tactic for greatly enhancing ML performance. © 2024 Chinese Society of Rare Earths

关键词： Phosphors

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Layer-by-Layer Assembled Flexible MXene/TiS_(2) Composite Films for Thermoelectric Applications

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Energy Material Advances 2024年第1期5卷 335-342页

作者： Zhihong Chen Na Li Wendi Zhao Mengting Liu Zuzhi Bai Congcong Liu Peipei Liu Fengxing Jiang Jingkun Xu Qinglin Jiang Jiangxi Province Key Laboratory of Flexible Electronics Jiangxi Science and Technology Normal UniversityNanchang 330013China School of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityNanchang 330013China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

MXene has great potential in the application of thermoelectric materials due to its high conductivity,but its application in this field is limited by the low Seebeck *** this work,a laminated composite film with a regular 2-dimensional heterogeneous interface was constructed by using 2-dimensional MXene and TiS_(2).The results show that the sandwich structure composite film has a high Seebeck coefficient(−80.4μV K^(-1))while maintaining a high electrical conductivity(322.12 S cm^(-1)).The power factor of the sandwich structure film is higher than that of the disordered structure film,which is 22 times that of the Ti_(3)C_(2)T_(x) *** simple flexible device prepared by MTM film has an ideal power density(26.6 W m^(-2))at a temperature difference of 70 *** work provides strong evidence and feasible reference for optimizing and improving the thermoelectric properties of MXene-based materials by using high-quality heterostructures.

关键词： mxene thermoelectric materials power fac laminated composite film seebeck coefficient sandwich structure composite film electrical conductivity tis

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Hybrid conductive-lithophilic-fluoride triple protection interface engineering:Dendrite-free reverse lithium deposition for high-performance lithium metal batteries

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Journal of Energy Chemistry 2025年第2期101卷 416-428,I0009页

作者： Huiying Li Chang Hong Runming Tao Xiaolang Liu Jianxing Wang Jianyu Chen Shuhao Yao Jiazhi Geng Guang Zheng Jiyuan Liang Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education School of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056HubeiChina Applied Materials Division Argonne National LaboratoryLemontIL 60439USA State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023JiangsuChina

Lithium metal batteries(LMBs)with high energy density are impeded by the instability of solid electrolyte interface(SEI)and the uncontrolled growth of lithium(Li)*** mitigate these challenges,optimizing the SEI structure and Li deposition behavior is the key to stable *** study novelty proposes a facile synthesis of MgF_(2)/carbon(C)nanocomposite through the mechanochemical reaction between metallic Mg and polytetrafluoroethylene(PTFE)powders,and its modified polypropylene(PP)separator enhances LMB *** in-situ formed highly conductive fluorine-doped C species play a crucial role in facilitating ion/electron transport,thereby accelerating electrochemical kinetics and altering Li deposition *** cycling,the in-situ reaction between MgF_(2)and Li leads to the formation of LiMg alloy,along with a LiF-rich SEI layer,which reduces the nucleation overpotential and reinforces the interphase strength,leading to homogeneous Li deposition with dendrite-free *** from these merits,the Li metal is densely and uniformly deposited on the MgF_(2)/C@PP separator side rather than on the current collector ***,the symmetric cell with MgF_(2)/C@PP exhibits superb Li plating/stripping performance over 2800 h at 1 mA cm^(-2)and 2 mA h cm^(-2).More importantly,the assembled Li@MgF_(2)/C@PPILiFePO4full cell with a low negative/positive ratio of 3.6delivers an impressive cyclability with 82.7%capacity retention over 1400 cycles at 1 C.

关键词： Lithium metal batteries Separator modification MgF_(2) Reverse deposition Mechanochemical reaction

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Effect of Y:Zn ratio on microstructure and emission of Er^(3+)/Yb^(3+) codoped Y_(2)O_(3)-ZnO ceramic phosphors

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Journal of Rare Earths 2023年第12期41卷 1883-1894,I0003页

作者： Boxu Xu Chao Song Jie Song Rui Huang Shaomin Lin Zhenxu Lin Yi Zhang Dejian Hou Jun Song School of Materials Science and Engineering Hanshan Normal UniversityChaozhou521041China Key Laboratory of Optoelectronic Devices and Systemsof MinistryofEducation and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

In this study,Er^(3+)/Yb^(3+)codoped Y_(2)O_(3)-ZnO ceramic phosphors were prepared by sol-gel *** samples had two emission bands,namely,green(535 nm) and red(660 nm),which are attributed to Er^(3+):^(2)H_(11/2)(^(4)S_(3/2))→^(4)I_(15/2)and Er^(3+):^(4)F_(9/2)→^(4)I_(15/2)radiative transitions,*** samples exhibited green-and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y2O3host,respectively and by 514.468 and 214.341 times that of the pure ZnO *** emission intensities are first enhanced by lattice *** the change of Y:Zn ratio,the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for *** the intensity of the asymmetric crystal field reaches maximum,both emissions are further *** the high surface energy transforms into crystal surface energy,the microstructure changes into a compact mesoporous ***,the chemical stability of the samples improves significantly,and the final emission band of the three samples with mesoporous structures is continuously red.

关键词： Mesoporous Y_(2)0_(3) Zno Luminescence Rare earths Ceramic phosphors

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Color-conversion displays:current status and future outlook

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Light(Science & Applications) 2024年第12期13卷 2941-2961页

作者： Guijun Li Man-Chun Tseng Yu Chen Fion Sze-Yan Yeung Hangyu He Yuechu Cheng Junhu Cai Enguo Chen Hoi-Sing Kwok Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic and Computer EngineeringThe Hong Kong University of Science and TechnologyHong KongChina National and Local United Engineering Laboratory of Flat Panel Display Technology College of Physics and Information EngineeringFuzhou UniversityCollege of Physics and Information Engineering 350108FuzhouChina Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

The growing focus on enhancing color quality in liquid crystal displays(LCDs)and organic light-emitting diodes(OLEDs)has spurred significant advancements in color-conversion ***,color conversion is also important for the development and commercialization of *** article provides a comprehensive review of different types of color conversion methods as well as different types of color conversion *** summarize the current status of patterning process,and discuss key strategies to enhance display ***,we speculate on the future prospects and roles that color conversion will play in ultra-high-definition micro-and projection displays.

关键词： materials projection outlook

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