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On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

Three-Dimensional Heterostructured Mnnicop/Feooh Cross-Linked Nano-Flake Supported by Ni Foam as a Bifunctional Electrocatalysts for Overall Water Splitting

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SSRN 2023年

作者： Zhu, Longqi Wang, Runze Liu, Xuehua Yang, Shuhan Liu, Haizhen Xing, Bo Wang, Kuikui Institute of Materials for Energy and Environment Laboratory of New Fiber Materials and Modern Textile Growing Basis for State Key Laboratory College of Materials Science and Engineering Qingdao University Qingdao266071 China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Guangxi Nanning530004 China National Engineering Laboratory of Circular Economy Sichuan University of Science and Engineering Sichuan Zigong643000 China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou University Jiangsu Changzhou213164 China

The production of three-dimensional heterogeneous structures is a vital approach for the creation of high-performance bifunctional electrocatalysts. Herein, three-dimensional heterostructure MnNiCoP/FeOOH (MNC-P/FeOOH) supported by Ni foam was prepared by simple electrodeposition and phosphorylation as a bifunctional electrocatalyst. The results showed that the required overpotential for MNC-P/FeOOH catalyst to reach 100 mA cm-2 current density was 124 mV and 251 mV in 1.0 M KOH solution, respectively. Construction of heterojunction not only improves the OER performance of MnNiCoP, but also reduces the potential required to drive the integral water splitting at 100 mA cm-2 current density. The electrocatalytic activity of MNC-P/FeOOH is greatly increased due to a distinctive interface synergy and strong electronic contacts in the MNC-P/FeOOH heterojunction. This design approach of bifunctional transition metal phosphides provides a potential route to achieve total water splitting. © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

Beating stripe solitons arising from helicoidal spin-orbit coupling in Bose-Einstein condensates

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Physical Review E 2025年第4期111卷 044203-044203页

作者： Cui-Cui Ding Qin Zhou B. A. Malomed Research Group of Nonlinear Optical Science and Technology Research Center of Nonlinear Science School of Mathematical and Physical Sciences Wuhan Textile University Wuhan 430200 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering and the Center for Light-Matter University Tel Aviv University Tel Aviv Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile

We demonstrate that the model of a spatially nonuniform two-component Bose-Einstein condensates (BEC) featuring the helicoidal spin-orbit coupling (SOC), gives rise to dark-bright soliton complexes characterized by spatiotemporal periodic oscillations in each component. These solitons are formed by the superposition of dark and bright ones, and exhibit a beating state over time and a striped state across space, earning them the designation of beating stripe solitons. Our analysis demonstrates that helicoidal SOC significantly affects the formation and dynamical properties of these solitons, also serving as the primary driver for spin oscillations. Through the nonlinear superposition of the beating stripe solitons, a range of intricate scenarios of the interaction between multiple solitons emerges, including head-on collisions, bound states, and parallel states.

关键词： Solitons

A Janus and Superhydrophilic Design for Stable and Efficient High-Salinity Brine Solar Interfacial Desalination

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SSRN 2022年

作者： Xiao, Xingfang Pan, Luqi Chen, Bei Chen, Tao Wang, Yingao Zhang, Qian Ren, Lipei Xu, Weilin State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Institute for Frontier Materials Deakin University GeelongVIC3216 Australia

Solar interfacial desalination is a potential pathway for freshwater using solar energy and brine. Many recent advances have been extensively studied to high-efficiency solar steam yield, however, the decrease of evaporation performance resulted from salt accumulation at absorbers inevitably hinder their development, especially in high-salinity brine (>10%). Here, we propose a Janus and superhydrophilic design for efficient and stable solar interfacial desalination in high-salinity brine. The Janus structure of the absorber, which has an upper layer of very light-absorbing (>95%) carbon fiber powder and a bottom layer of insulated aramid fiber powder, allows for efficient thermal management to prevent heat loss and promote efficient water evaporation. Furthermore, the impact of carboxylate cellulose ensures that the absorber with an ultra-high-water content. Therefore, the Janus and superhydrophilic design can realize an evaporation rate as high as 1.25 kg m −2 h −1 with a salinity of 15 wt% brine under 1-sun illumination and achieve salt resistance in outdoor conditions for a long time. Therefore, this technique simply integrates outdated fiber powder with the current solar interfacial evaporators and establishes a new paradigm for very effective and reliable high-salinity brine treatment. © 2022, The Authors. All rights reserved.

关键词： Evaporation

Optimizing Mechanical Stretchability and Photovoltaic Performance in All-Polymer Solar Cells from a Two‐Donor Polymer Blend

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SSRN 2023年

作者： Li, Mingfei Xian, Kaihu Zhao, Wenchao Sheng, Dan Liu, Chunhui Li, Xin Li, Weiwei Ye, Long Tianjin300350 China Co-Innovation Center of Efficient Processing Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Hubei Longzhong Laboratory Xiangyang441000 China

In recent years, the power conversion efficiency (PCE) of all-polymer organic solar cells (OSCs) has surpassed 18%, reaching a level suitable for commercial applications. To meet the dual requirements of high efficiency and high stretchability for flexible wearable applications, ternary blending strategies have been widely used to improve the stretchability of all-polymer OSCs. However, up to now, achieving synergistic optimization of both photovoltaic and mechanical properties has not been ideal. Here, we introduce a long-branched alkyl chain-containing PM6-like donor polymer, PM6-OD, into a PM6:PY-IT blend to address this issue. When the content of PM6-OD in the donor polymers is 20%, both the photovoltaic and mechanical properties of the ternary solar cell are improved. The variation of the mechanical and photovoltaic properties with the PM6-OD content in the donor was analyzed through grazing-incidence X-ray scattering and mechanical measurements to gain a deeper understanding of the intrinsic relationship between film structure and mechanical properties. In addition, the data points of elastic moduli match well with the Kerner-Davis model. This work provides new guidance for the construction of high-efficiency, stretchable OSCs and has a promoting effect on the application of organic photovoltaic cells in the field of wearable/stretchable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Organic solar cells

Electrodeposition of Polyaniline on Reduced Graphene Oxide/Cotton Yarn with Tunable Electrochemical Performance for Flexible textile Supercapacitors

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SSRN 2024年

作者： Li, Lin Du, Dou He, Chengen Han, Kun Xu, Weilin Xia, Liangjun Cai, Guangming Cui, Xun Chen, Yihuang Yu, Lianqing Kong, Lingxue State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Institute for Frontier Materials Deakin University GeelongVIC3216 Australia École Polytechnique Fédérale de Lausanne LausanneCH-1015 Switzerland College of Chemistry and Materials Engineering Wenzhou University Zhejiang Wenzhou325035 China

Graphene/cotton fibers show significant promise in wearable energy storage due to their low cost, porous structure, and exceptional integration ability into wearable systems. However, the eco-unfriendly reductants and standalone electric double-layer capacitor hindered their application. Herein, a green and rapid hydrothermal-electrodeposition method was proposed to fabricate polyaniline (PANI) decorated reduced graphene oxide (rGO)/cotton yarns without using any chemical reductants and oxidants. The PANI/rGO/cotton (PRC) yarn exhibited porous conductive network, mechanical flexibility, and structural controllability. Additionally, the PRC yarn electrode delivers a fast electron transport and ion migration, synergistic energy storage contribution, and a controllable capacitance (up to 81.2 mF cm−1 at 0.2 mA cm−1). The assembled yarn supercapacitor shows a good capacitance (19.8 mF cm−1 at 0.08 mA cm−1), excellent energy-power density (2.7 μWh cm−1 at 40 μW cm−1), and great capacitance retention. This green fabrication of PRC yarns brings new insights into the development of wearable energy storage. © 2024, The Authors. All rights reserved.

关键词： Graphene

Interfacial Preparation of Magneto-Plasmonic Fe3o4@Au Core@Shell Nanoechinus as Efficient Photothermal Agents for Anti-Bacterial Application

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SSRN 2022年

作者： Lv, Xuelian Fang, Zheng Sun, Yimin Yang, Yongsheng Wang, Xing Chen, Yazhou Qin, Yanmin Li, Na Li, Chen Xu, Jie Bao, Haifeng School of Materials Science and Engineering State Key Laboratory of New Textile Materials & Advanced Processing Technology Wuhan Textile University Wuhan430200 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China College of Chemistry and Chemical Engineering Wuhan Textile University Wuhan430200 China

We report the facile synthesis of Fe 3 O 4 @Au core/shell nanoechinus through a template-free liquid-liquid interfacial growth reaction. The prepared magneto-plasmonic Fe 3 O 4 @Au core/shell nanoechinus exhibited outstanding SPR absorption in the NIR region, which imparts the nanoechinus with a superior photothermal conversion efficiency of 69.9%, making this material an efficient photothermal agent for antibacterial application. Our results indicated that the magneto-plasmonic Fe 3 O 4 @Au core/shell nanoechinus could effectively kill both Gram negative E. coli and Gram positive S. aureus under 980 nm laser irradiation and kept good photo-stability after multiple photothermal bacteria killing. We envision that the development of advanced strategy for high efficient antibacterial hybrid nanoparticles could have broad applications in therapy and medical devices. © 2022, The Authors. All rights reserved.

关键词： Plasmonics

The influence of cooling rates on strain phase diagrams and domain structures of ferroelectric thin films: A case study of PbTiO₃

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Acta Materialia 2025年 296卷

作者： Zhou, Meng-Jun Zhang, Peng Wang, Bo Yi, Di Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Materials Science Division Lawrence Livermore National Laboratory Livermore 94550 CA United States School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Strain engineering has been established as an effective approach to control phase equilibria, domain configurations, and functional properties of ferroelectric thin films. Temperature-strain phase diagrams have been used as powerful tools for providing insights into strain engineering. However, almost all existing phase diagrams established using the phase-field approach assume quenching conditions without considering actual cooling rates during the post-deposition annealing process of ferroelectric thin films. Within this work, we systematically investigate the influence of cooling rates on domain structures and the strain-phase diagram of ferroelectric thin films using phase-field simulations, taking PbTiO₃ thin films as a model system. We found that both the position of phase boundaries in the strain phase diagrams and the domain morphology are significantly influenced by the cooling rates. It is revealed that while the paraelectric-ferroelectric phase boundary remains invariant, the phase boundaries between single-phase and multi-phase regions tend to shift toward the corresponding multi-phase region as the cool rate reduces. Slow cooling generally leads to more ordered domain structures with increased domain size. Using the obtained equilibrium domain structures, we calculated effective thermal conductivities and found significant variations that can be tuned by the cooling rates. This work reveals an underexplored yet critical impact of cooling rates on phase equilibria and domain structures in ferroelectric thin films, which may inspire further fine-tuning of domains and domain walls in low-dimensional ferroelectrics for multifunctional applications. © 2025

关键词： Domain structures Ferroelectric thin films Phase diagrams Phase-field simulation Thermal conductivity

Synergistic band convergence and defect engineering boost thermoelectric performance of SnTe

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Journal of materials Science & technology 2021年第27期86卷 204-209页

作者： Ximeng Dong Wenlin Cui Wei-Di Liu Shuqi Zheng Lei Gao Luo Yue Yue Wu Boyi Wang Zipei Zhang Liqiang Chen Zhi-Gang Chen State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of PetroleumBeijing 120049PR China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249PR China Centre for Future Materials University of Southern QueenslandSpringfield CentralQueensland 4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQueensland 4072Australia State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.Ltd.Changping DistrictBeijing 102211PR China Beijing Key Laboratory of Failure Corrosion and Protection of Oil/gas Facilities and Department of Materials Science and EngineeringCollege of New Energy and MaterialsChina University of PetroleumBeijing 102249PR China

As an eco-friendly thermoelectric material,Sn Te has attracted extensive *** this study,we use a stepwise strategy to enhance the thermoelectric performance of Sn ***,Ag Cl is doped into Sn Te to realize band convergence and enlarge the band gap of Ag Cl-doped Sn *** Cl-doping also induces dense point defects,strengthens the phonon scattering,and reduces the lattice thermal ***,Sb is alloyed into Ag Cl-doped Sn Te to further optimize the carrier concentration and simultaneously reduce the lattice thermal conductivity,leading to improved thermoelectric dimensionless figure of merit,***,(Sn_(0.81)Sb_(0.19)Te)_(0.93)(Ag Cl)_(0.07)has approached the ZT value as high as~0.87 at 773 K,which is 272%higher than that of pristine Sn *** study indicates that stepwise Ag Cl-doping and Sb-alloying can significantly improve thermoelectric performance of Sn Te due to synergistic band engineering,carrier concentration optimization and defect engineering.

关键词： Thermoelectric SnTe Stepwise optimize Band structure Lattice thermal conductivity