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Blue Light Excitation at Room Temperature in Lead-Free Perovskite Cs2Ag1-xNaxIn1-yBiyCl6 for Optoelectronic Devices Through Enhanced Synergistic Energy Transfer with Yb-Doping

SSRN

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SSRN 2025年

作者： Gong, Xiao-Kai Zhang, Xiao-Song Li, Qian Zhao, Xing-Yao Kong, Li-Na Jin, En-Ze Zhou, Bao-Zeng Xu, Jian-Ping Li, Lan School of Materials Science and Engineering Key Laboratory of Display Materials and Photoelectric Devices Ministry of Education Tianjin Key Laboratory for Photoelectric Materials and Devices Tianjin University of Technology Tianjin300384 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing100076 China School of Integrated Circuit Science and Engineering Tianjin Key Laboratory of Film Electronic & Communicate Devices Tianjin University of Technology Tianjin300384 China

Lead-free perovskites have become a focal point in the quest for non-toxic and stable materials for optoelectronic applications. Despite this interest, achieving blue light emission from lead-free halide double perovskites Cs2AgInCl6 at room temperature remains a significant challenge, hindering their commercial viability. In this study, we address this issue by synthesizing the rare earth lead-free double perovskite Cs2Ag0.6Na0.4In0.8Bi0.2Cl6:Yb, which demonstrates visible/NIR light emission at 598 and 1000 nm upon blue light excitation at room temperature. We show that this excitation stems from complex interactions between energy level splitting induced by Yb and self-trapped exciton energy levels. Notably, we observe that under blue excitation, the photoluminescence intensity increases with temperature. Furthermore, Cs2Ag0.6Na0.4In0.8Bi0.2Cl6:Yb was integrated into a blue light-emitting diode, enhancing the conversion efficiency of GaAs solar cells as a down-shifting layer. Ultimately, this research opens new avenues for developing eco-friendly, efficient materials with significant implications for sustainable technology. © 2025, The Authors. All rights reserved.

关键词： III-V semiconductors

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Enhancing electrocatalytic N_(2)-to-NH_(3) fixation by suppressing hydrogen evolution with alkylthiols modified Fe_(3)P nanoarrays

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Nano Research 2022年第2期15卷 1039-1046页

作者： Tong Xu Jie Liang Yuanyuan Wang Shaoxiong Li Zhaobai Du Tingshuai Li Qian Liu Yonglan Luo Fang Zhang Xifeng Shi Bo Tang Qingquan Kong Abdullah M.Asiri Chun Yang Dongwei Ma Xuping Sun Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China Key Laboratory for Special Functional Materials of Ministry of Education and School of Materials Science and EngineeringHenan UniversityKaifeng 475004China Institute for Advanced Study Chengdu UniversityChengdu 610106China National Engineering Research Center for Nanotechnology No.28 East Jiang Chuan RoadShanghai 200241China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Chemistry Department Faculty of Science&Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Electrocatalytic N_(2) reduction provides an attractive alternative to Haber-Bosch process for artificial NH_(3) *** difficulty of suppressing competing proton reduction,however,largely impedes its practical ***,we design a hydrophobic octadecanethiol-modified Fe_(3)P nanoarrays supported on carbon paper(C18@Fe_(3)P/CP)to effectively repel water,concentrate N_(2),and enhance N_(2)-to-NH_(3) *** catalyst achieves an NH_(3) yield of 1.80×10^(-10) mol s^(-1)·cm^(-2) and a high Faradaic efficiency of 11.22%in 0.1 M Na_(2)SO_(4),outperforming the non-modified Fe_(3)P/CP(2.16×10^(-11) mol s^(-1)·cm^(-2),0.9%)***,C18@Fe_(3)P/CP renders steady Nrfixing activlty/selectivity in cycling test and exhibits durability for at least 25 ***-principles calculations suggest that the surface electronic structure and chemical activity of Fe_(3)P can be well tuned by the thiol modification,which facilitates N_(2) electroreduction activity and catalytic formation of NH_(3).

关键词： Fe_(3)P nanoarrays octadecanethiol surface modification ambient N_(2)reduction first-principles calculation

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Enhanced photocatalytic ammonia oxidation over WO3@TiO2 heterostructures by constructing an interfacial electric field

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Chemosphere 2024年 355卷 141811页

作者： Li, Zhaonian Li, Daorong Feng, Zhanzhao Lv, Shuqi Zhang, Qingxuan Yu, Yanru Tian, Ying Huang, Runfeng Chen, Hongxia Zhang, Kunfeng Dai, Hongxing College of Environmental Engineering Henan University of Technology Henan Zhengzhou450001 China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Advanced Functional Materials Ministry of Education Department of Chemical Engineering and Technology College of Materials Science and Engineering Beijing University of Technology Beijing100124 China Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental Science and Engineering Beijing University of Technology Beijing100124 China

WO3 nanorods and xWO3@TiO2 (WO3/TiO2 mass ratio (x) = 1−5) photocatalysts were synthesized using the hydrothermal and sol-gel methods, respectively. The photocatalytic activities of xWO3@TiO2 for NH3 oxidation first increased and then decreased with a rise in TiO2 content. Among them, the heterostructured 3WO3@TiO2 photocatalyst showed the highest NH3 conversion (58 %) under the simulated sunlight irradiation, which was about two times higher than those of WO3 and TiO2. Furthermore, the smallest amounts of by-products (i.e., NO and NO2) were produced over 3WO3@TiO2. The enhancement in photocatalytic performance (i.e., NH3 conversion and N2 selectivity) of 3WO3@TiO2 was mainly attributed to the formed interfacial electric field between WO3 and TiO2, which promoted efficient separation and transfer of photogenerated charge carriers. Based on the results of reactive species trapping and active radical detection, photocatalytic oxidation of NH3 over 3WO3@TiO2 was governed by the photogenerated holes and superoxide radicals. This work combines two strategies of morphological regulation and interfacial electric field construction to simultaneously improve light utilization and photogenerated charge separation efficiency, which promotes the development of full-spectrum photocatalysts for the removal of ammonia. © 2024 Elsevier Ltd

关键词： Ammonia

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Synergistically Enhanced the Strength and Ductility of Network-Structured Titanium Matrix composites Reinforced with B-Containing Precursor-Derived TiB Nanowires

SSRN

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SSRN 2023年

作者： Zhong, Zhaoxin Zhang, Biao Ye, Jian Ren, Yuhan Zhang, Jiawei Ye, Feng School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Key Laboratory of Advanced Structure-Functional Integration Materials & Green Manufacturing Technology Harbin150080 China

Improving the aspect ratio of TiB whiskers is of great importance for addressing the strength-ductility trade-off of TiB-reinforced Ti matrix composites (TCMs), which is accomplished primarily through introducing boron-containing nanoceramics via powder metallurgy. However, this technique can cause whisker clusters at grain boundaries and increase the oxygen content resulting in a marked decrease in ductility. Herein, a network-structured architecture constructed by high-aspect-ratio TiB nanowires has been proposed and realized through boron-containing precursor shell-layer encapsulation on Ti particles and consolidation by spark plasma sintering. The in-situ derived TiB nanowires with aspect ratios up to 304.4 through unique SLS growth mechanism contribute to the high strength (1318 MPa) and sufficient ductility (5.34%) of TCMs. Simultaneously, the dual-strategy of active deoxidation effect originated from the reductive pyrolysis gas and passive prevention of impurity O based on the precursor shell-layer without lengthy ball-milling can significant removal of the oxygen from TCMs. © 2023, The Authors. All rights reserved.

关键词： Spark plasma sintering

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Highly active cobalt-doped nickel sulfide porous nanocones for high-performance quasi-solid-state zinc-ion batteries

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Journal of Energy Chemistry 2022年第3期31卷 237-249,I0008页

作者： Xin Tong Yun Li Ning Pang Yang Zhou Dajun Wu Dayuan Xiong Shaohui Xu Lianwei Wang Paul K.Chu Key Laboratory of Polar Materials and Devices(MOE) Department of ElectronicsEast China Normal UniversityShanghai 200241China Jiangsu Laboratory of Advanced Functional Materials School of Electronic and Information EngineeringChangshu Institute of TechnologyChangshu 215500JiangsuChina School of Physics and Electronic Engineering Hanshan Normal UniversityChaozhou 521041GuangdongChina Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongKowloon 999077Hong KongChina

Flexible quasi-solid zinc-ion batteries(ZIBs)have large potential in power applications due to the low price,wearable nature,safety,and high ***,the use of transition metal sulfide cathodes in ZIBs has not been studied extensively and the underlying mechanism and theoretical basis of this type of batteries are not well ***,a highly active cobalt-doped Ni_(3)S_(2) porous nanocone framework(C12NS)is designed and demonstrated as a zinc-ion battery ***-principles calculation and experiments reveal that the cobalt dopant improves the battery properties *** assembled flexible zinc-ion battery exhibits a high specific capacity of 453.3 mAh g^(−1)at a current density of 0.4 A g^(−1)in as well as excellent cycling stability as manifested by a capacity retention ratio of 89.5%at a current density of 4 A g^(−1)after 5000 *** peak energy density of 553.9 Wh kg^(−1)is also superior to those of most recently reported NiCo-based zinc-ion *** importantly,the flexible battery can be operated under severe mechanical bending and even continues to work after physical puncturing without showing *** exciting results not only reveal a novel design of cathode materials for zinc-based batteries,but also suggest their immense commercial potential in portable and wearable electronics.

关键词： Zn-ion battery Quasi-solid electrolyte Nanocone Doping Wearable electronic

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Optimizing microstructure and mechanical properties of heat-treated Al-Zn-Mg-Cu alloy by indirect hot deformation technology

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Journal of Central South University 2022年第11期29卷 3544-3556页

作者： ZHANG Quan-da SUN Fu-zhen LIU Meng LIU Wen-cai State Key Laboratory of Advanced Forming Technology and Equipment(China Academy of Machinery Science&Technology) Beijing 100044China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite(Shanghai Jiao Tong University) Shanghai 200240China

In this paper,the indirect thermal tensile experiments of 7075 aluminum alloy including the pre-deformation process at room temperature and the final heat tensile process were carried out,the plastic deformation behavior and forming limit of the material in the compound forming process were investigated considering three pre-deformation amounts 4%,9%,14%,two strain rates 0.001 s^(-1),0.01 s^(-1) and four forming temperatures 300℃,350℃,400℃,450℃.In the indirect hot forming process,the material is sensitive to the pre-deformation,strain rate,and forming temperature,when the strain rate is 0.01 s^(-1),the pre-deformation amount is 4%,and the forming temperature is 400℃,respectively,the maximum tensile deformation is 50 ***,taking the process in which the forming temperature is 450℃ as an example,according to the observation of the microstructure appearance of fracture,the fracture type in the hot forming process was judged as the ductile *** analyzing the microstructure of the specimen treated with the quenching and artificial aging process,the eutectic T(AlZnMgCu)phase and α(Al)matrix formed a network of non-equilibrium alpha binary eutectic.

关键词： strain rate pre-deformation forming temperature AA7075 compound tensile

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Synergistically Enhanced the Strength and Ductility of Network-Structured Titanium Matrix composites Reinforced with B-Containing Precursor-Derived Tib Nanowires

SSRN

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SSRN 2023年

作者： Zhong, Zhaoxin Ye, Feng Zhang, Biao Ye, Jian Ren, Yuhan Zhang, Jiawei School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Key Laboratory of Advanced Structure-Functional Integration Materials & Green Manufacturing Technology Harbin150080 China

A network-structured architecture constructed by high-aspect-ratio TiB nanowires has been proposed and realized through boron-containing precursor shell-layer encapsulation on Ti particles and consolidation by spark plasma sintering. The in-situ derived TiB nanowires with aspect ratios up to 304.4 contribute to high strength (1318 MPa) and sufficient ductility (5.34%) of TCMs. © 2023, The Authors. All rights reserved.

关键词： Aspect ratio

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Insights into the Microstructure and Mechanical of Titanium Matrix composites Reinforced with B-Containing Precursor-Derived Tib Nanowires

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SSRN 2023年

关键词： Microstructure

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Switching Two-Dimensional Sliding Ferroelectrics by Mechanical Bending

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Physical Review Letters 2025年第7期134卷 076101-076101页

作者： Ri He Hua Wang Fenglin Deng Yuxiang Gao Bingwen Zhang Yubai Shi Run-Wei Li Zhicheng Zhong Key Laboratory of Magnetic Materials Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100049 China Center for Quantum Matter School of Physics Zhejiang University Hangzhou 310058 China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou 215123 China Fujian Key Laboratory of Functional Marine Sensing Materials Center for Advanced Marine Materials and Smart Sensors College of Material and Chemical Engineering Minjiang University Fuzhou 350108 China School of Future Technology University of Chinese Academy of Sciences Beijing 100049 China School of Artificial Intelligence and Data Science University of Science and Technology of China Suzhou 215123 China

Two-dimensional van der Waals materials, possessing a unique stacking degree of freedom, offer an alternative strategy for modulating their properties through interlayer sliding. Controlling the stacking order is crucial for tuning material properties and developing slidetronics-based devices. Here, using machine-learning potentials, we propose a mechanical bending approach to manipulate stacking orders and related properties in sliding ferroelectric h-BN, 3R-MoS2, and nonferroelectric bilayer graphene. Our simulations predict the formation of irreversible kinks in bent bilayers, deviating from the expected arclike deformation. This kink formation arises from the interplay between bending energy and interlayer stacking energy. Notably, the bending-induced kink contains a ferroelectric topological domain wall that reverses the polarization of sliding ferroelectrics, a mechanism distinct from the conventional flexoelectric effect. This work proposes an exciting mechanical bending approach to dynamically manipulate the stacking order and associated optical, topological, ferroelectric, and magnetic properties in van der Waals layered materials.

关键词： Van der Waals forces

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Group Theory on Quasi-symmetry and Protected Near Degeneracy

arXiv

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arXiv 2023年

作者： Li, Jiayu Zhang, Ao Liu, Yuntian Liu, Qihang Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory for Computational Science and Material Design Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China

In solid state systems, group representation theory is powerful in characterizing the behavior of quasiparticles, notably the energy degeneracy. While conventional group theory is effective in answering yes-or-no questions related to symmetry breaking, its application to determining the magnitude of energy splitting resulting from symmetry lowering is limited. Here, we propose a theory on quasi-symmetry and near degeneracy, thereby expanding the applicability of group theory to address questions regarding large-or-small energy splitting. Defined within the degenerate subspace of an unperturbed Hamiltonian, quasi-symmetries form an enlarged symmetry group eliminating the first-order splitting. This framework ensures that the magnitude of splitting arises as a second-order effect of symmetry-lowering perturbations, such as external fields and spin-orbit coupling. We systematically tabulate the quasi-symmetry groups within 32 crystallographic point groups and demonstrate that Zn, U(1), and D∞ can serve as the quotient group of unitary quasi-symmetry group in doubly degenerate subspace. Applying our theory to the realistic material AgLa, we predict a "quasi-Dirac semimetal" phase characterized by two tiny-gap band anticrossings. © 2023, CC BY.

关键词： Spin orbit coupling

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