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Recent advances in flexible noninvasive electrodes for surface electromyography acquisition

npj Flexible Electronics 2023年第1期7卷 139-164页

作者： Lian Cheng Jun Li Aiying Guo Jianhua Zhang School of Microelectronics Shanghai University201800 ShanghaiChina Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University200072 ShanghaiPeople’s Republic of China

Surface electromyography(sEMG)is used to detect and analyze human muscle ***,flexible noninvasive electrodes(FNEs)have emerged to extract bioelectrical signals from individual *** FNEs to be deployed as a central component of physiological signal acquisition,the quest for elevated signal-to-noise ratio and density is compelling owing to the small amplitude of ***,we review recent progress in FNEs for sEMG *** summarize the needed properties of FNEs,compare the differences between passive electrodes and active electrodes and exemplify applications of *** also conclude the current challenges and future opportunities in sEMG acquisition.

关键词： potential. electrodes surface

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Simulation of Bonding and Reliability for Micro-LED Array Based on Copper Pillar Bump 21

Simulation of Bonding and Reliability for Micro-LED Array Ba...

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21st China International Forum on Solid State Lighting and 10th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2024

作者： Fu, Hao Yang, Zhu Meng, Xinhui Fan, Hong Lu, Xiuzhen Yin, Luqiao Zhang, Jianhua School of Microelectronics Shanghai University Shanghai201800 China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai2000072 China

ISBN: (纸本)9798331541149

With the rapid development of automotive electronics and near-eye displays, more stringent requirements have appeared for the heterogeneous integration technology of Micro-LED. Copper pillar bumps, which offer enhanced electrical conductivity, thermal conductivity, and mechanical properties, can meet the demands for higher density and smaller size packaging in Micro-LED array applications. In Micro-LED system integration, bonding plays a critical role as the bonding conditions significantly influence the performance and reliability of Micro-LED. Consequently, it is essential to investigate the effects of bonding conditions on Micro-LED devices to ensure optimal performance and reliability of copper pillar bumps. A model with copper pillar bumps and Micro-LED chips was presented with a bonding simulation and parameter analysis performed in this paper. The finite element method was utilized to examine the thermal-mechanical coupling of one quarter of a 5×5 Micro-LED array model in this paper. The stress and deformation of the bumps during the bonding process and the effects of bonding conditions on the stress and deformation of the bumps was investigates. ©2024 IEEE.

关键词： bonding copper pillar bump Micro-LED orthogonal test

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Low subthreshold swing enables high synaptic weight gains based on channel-side gate dependent electrolyte transistors FET design 21

Low subthreshold swing enables high synaptic weight gains ba...

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21st China International Forum on Solid State Lighting and 10th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2024

作者： Gong, Qiming Wang, Fei Zheng, Hao Li, Mengjiao School of Microelectronics Shanghai University Shanghai200444 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai200072 China

ISBN: (纸本)9798331541149

With the development of IoT and AI technologies, brain-like synaptic devices with precise weight modulation of synaptic plasticity and controllable preparation are of great significance for developing neuromorphic computing and intelligent sensing technologies. In this paper, we design a series of side-gate electrolyte transistors with varying gate-channel distances and systematically examine the structural design effect on synaptic weight modulation. A synaptic transistor device with an ultra-low subthreshold swing of 89.8 mV/dec has been successfully achieved by optimizing the gate-channel design. Additionally, Further characterizations of the short-term synaptic plasticity and long-term synaptic plasticity of synaptic transistors uncover the flexible modulation of the gate-channel distance-dependent synaptic weight gain behaviors, which span from as low as 6.1 to as high as 87.5 under 50 successive stimuli. The results of this work provide a reliable solution for the design and preparation of high-performance synaptic devices and lay the foundation for high-precision neural networks and intelligent sensing technologies. ©2024 IEEE.

关键词： Integrated circuit design

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Efficient Red Sn-Based Perovskite Light Emitting Diodes by a Competitive Antioxidation Strategy

IEEE Electron Device Letters

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IEEE Electron Device Letters 2025年第6期46卷 948-951页

作者： Gong, Yingqun Shi, Yuxin Huo, Sitao Wang, Lin Zhang, Xiaofei Kong, Lingmei Wang, Sheng Yang, Yingguo Yang, Xuyong Shanghai University Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai200072 China Seoul National University Department of Materials Science and Engineering Seoul08826 Korea Republic of Shanghai Tianma Micro-Electronics Company Ltd. Shanghai110044 China Zhangjiang Laboratory Shanghai200031 China Fudan University School of Microelectronics Shanghai200433 China

Tin (Sn)-based perovskite light-emitting diodes (PeLEDs) have emerged as a promising candidate for next-generation displays because of their eco-friendliness, exceptional optoelectronic properties, and cost-effective solution processability. However, their electroluminescence performance still lags behind their lead (Pb) counterparts, primarily due to the undesired Sn2+ oxidation to Sn4+ and the rapid crystallization of Sn-based perovskite, resulting in high defect density as well as poor film quality. Herein, we reported a competitive antioxidation strategy by utilizing a phosphorus ylide, namely (triphenylphosphoranilidene) acetaldehyde (TPPA), to suppress the oxidation of Sn2+ and regulate the growth kinetics, simultaneously. The TPPA with highly active polar phosphorus-carbon bonds can be oxidized prior to Sn2+, and their large steric hindrance can slow down the crystallization process of tin-based perovskite. Moreover, the main product from the oxidation reaction, namely triphenylphosphine oxide (TPPO), can further passivate defects by coordinating with SnI6 octahedra. The resulting Sn-based perovskite film exhibits enhanced optical properties and uniform, dense morphology. Leveraging these improvements, the optimized PeLED delivers pure-red light emission with Commission Internationale de L’Eclairage (CIE) color coordinates of (0.69, 0.30), an external quantum efficiency (EQE) of 8.1% and maximum luminance of 672 cd m−2. This work provides a facile route to enhance the overall performance of Sn-based PeLEDs. © 1980-2012 IEEE.

关键词： Perovskite

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Efficient and Stable Perovskite Light-Emitting Diodes Enabled by Oriented Growth Regulation

IEEE Electron Device Letters

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IEEE Electron Device Letters 2025年第6期46卷 952-955页

作者： Zhang, Kun Zhang, Xiaofei Zhang, Chengxi Feng, Jie Kong, Lingmei Wang, Sheng Yang, Yingguo Wang, Lin Yang, Xuyong Shanghai University Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai200072 China Jiangsu University of Science and Technology School of Science Zhenjiang212100 China Zhangjiang Lab Shanghai Advanced Research Institute Shanghai China Fudan University School of Microelectronics Shanghai China

Metal halide perovskites have demonstrated remarkable progress in optoelectronic applications, including solar cells and light-emitting diodes (LEDs). However, the long-term stability of perovskite LEDs (PeLEDs) remains a critical challenge, impeding their practical applications and commercialization. Herein, we regulate the growth kinetics of perovskites in liquid-solid stages by introducing 2,3,4,5, 6-pentafluorophenylphosphonic acid (PFBPA) into the precursor solution. The PFBPA molecules will create a protective passivation layer by coordinating with uncoordinated lead (Pb2+) on the perovskite surface, which regulates the growth of perovskite crystals during the liquid-solid stages and results in the formation of uniform perovskite films with reduced grain size. Moreover, the coordination of PFBPA with Pb2+ also improves the moisture resistance of perovskites, favoring the operational stability of devices. The resulting PeLED devices achieved a maximum brightness of 12426 cd m-2, a peak external quantum efficiency (EQE) of 22.6%, and a remarkable operational stability with a half-lifetime exceeding 1187 hours at initial luminance of 100 cd m-2. © 1980-2012 IEEE.

关键词： Perovskite

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Three-dimensional MXene/carbon nanotube composite electrodes in flexible 64-channel arrays for noninvasive electromyography signal acquisition

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Science China Materials 2024年第9期67卷 2977-2984页

作者： Lian Cheng Aiying Guo Jun Li Mengjiao Li Qiang Lei Wen Xu Xiaolin Guo Jianhua Zhang School of Microelectronics Shanghai UniversityShanghai201800China Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghai200072China

Non-invasive surface electromyography(sEMG)electrodes have vast potential in fields such as healthcare,human-computer interaction,and entertainment,providing diverse information related to electromyographic ***-invasive sEMG electrodes reduce user risks but gather sEMG signals of lower quality compared to invasive ***,various advanced electrode materials have been developed for detecting physiological electrical signals,but the majority of them are single channel ***,we report 64-channel three-dimensional(3D)Ti_(3)C_(2)MXene/CNT composite electrodes fabricated using bonding-driven self-assembly *** electrodes are characterized by low skin-electrode contact impedance and a high signal-to-noise ratio(SNR)for collection of EMG *** electrode arrays exhibit remarkable flexibility,conforming seamlessly to the skin’s ***,the skin-electrode contact impedance of 3D Ti_(3)C_(2)MXene/CNT electrodes decreases by 10-fold compared to Ag/AgCl gel electrodes at a frequency of 100 ***,when collecting sEMG signals from the arm,the prepared Ti_(3)C_(2)MXene/CNT electrodes exhibit lower baseline noise and higher SNR compared to Ag/AgCl gel ***,Ti_(3)C_(2)MXene/CNT electrodes can collect sEMG signals of different hand gestures,while maintaining a high SNR(∼25 dB).By combining machine learning,sEMG signals from different gestures can be identified with a recognition rate exceeding 90%.The exceptional performance and scalability of these 3D Ti_(3)C_(2)MXene/CNT electrodes indicate a promising future for shaping electronic skin and wearable device technologies.

关键词： electrodes surface electromyography skin-contact impedance Ti_(3)C_(2)MXenes CNTs

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Performance Optimization of Target Detection Based on Edge-to-Cloud Deep Learning 18

Performance Optimization of Target Detection Based on Edge-t...

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Colloidal Nanoparticles for Biomedical applications XVIII 2023

作者： Fan, ZhongKui Guan, YePeng School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai200444 China

ISBN: (纸本)9781510658950

With the development of mobile internet, real-time target detection using mobile devices has wide application prospects, but the computing power of the terminal greatly limits the speed and accuracy of target detection. Edge-cloud collaborative computing is the main method to solve the lack of computing power of mobile terminals. The current method can't settle the problem of computation scheduling in the edge-cloud collaboration system. Given the existing problems, this paper proposes the pruning technology of classical target detection deep learning networks;training and prediction offloading strategy of edge-to-cloud deep learning network;dynamic load balancing migration strategy based on CPU, memory, bandwidth, and disk state-changing in cluster. After testing, the edge-to-cloud deep learning method can reduce the inference delay by 50% and increase the system throughput by 40%. The maximum waiting time for operation can be reduced by about 20%. The efficiency and accuracy of target detection are effectively improved. © 2023 SPIE.

关键词： Deep learning

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Oxide Semiconductor Thin-Film Transistors with High Mobility and Stability

Oxide Semiconductor Thin-Film Transistors with High Mobility...

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International Conference on display Technology, 2024

作者： Yan, Guowen Wang, Dejian Sun, Xiaoqi Wen, Pan Peng, Cong Xu, Lin Ding, Lidong Chen, Fa-Hsyang Li, Xifeng Xi, Wangfeng Xing, Rubo Li, Junfeng Hefei Visionox Technology Co. Ltd Anhui Hefei230000 China Kunshan Govisionox Optoelectronics Co. Ltd Jiangsu Suzhou215301 China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China

This paper presents a oxide thin film transistors with high mobility by a new fabricate method. The high mobility TFT with ultra-high mobility of 55cm2/Vs has been obtained, and the PBTS and NBTS has also been optimiz... 详细信息

关键词： Thin film transistors

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Multi-depth Hologram Generation with Unsupervised-learning Based Computer-generated Holography

Multi-depth Hologram Generation with Unsupervised-learning B...

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Digital Holography and Three-Dimensional Imaging, DH 2022

作者： Shui, Xinghua Zheng, Huadong Department of Precision Mechanical Engineering Shanghai University Shanghai200444 China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai200072 China

Unsupervised-learning based computer-generated holography provides an approach for 2D hologram generation. We propose an unsupervised learning network for multi-depth hologram generation with fully utilizing the diffe... 详细信息

ISBN: (纸本)9781957171128

关键词： Holograms

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Linker aggregation engineering of TADF materials to tune carrierbalance for highly efﬁcient organic LEDs with long operationallifetime

Aggregate

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Aggregate 2024年第5期5卷 385-393页

作者： Zhen Zhang Rongrong Xia Ke Wang Youjun Wu Panpan Zang Xuemin Gan Zhangcheng Liao Bin Wei Peng Wu Stefan Bräse Zixing Wang Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghaiChina Institute of Organic Chemistry Karlsruhe Institute of Technology(KIT)KarlsruheGermany Institute of Biological and Chemical Systems-Functional Molecular Systems(IBCS-FMS) Karlsruhe Institute of Technology(KIT)KarlsruheGermany

Thermally activated delayedﬂuorescence(TADF)molecules are regarded as promis-ing materials for realizing high-performance organic light-emitting diodes(OLEDs).The connecting groups between donor(D)and acceptor(A)units in D–A type TADF molecules could affect the charge transfer and luminescence performance of TADF materials in aggregated *** this work,we design and synthesize four TADF molecules using planar and twisted linkers to connect the aza-azulene donor(D)and triazine acceptor(A).Compared with planar linkers,the twisted ones(Az-NP-T and Az-NN-T)can enhance A–A aggregation interaction between adjacent molecules to balance hole and electron *** a result,highly efﬁcient and stable deep-red top-emission OLEDs with a high electroluminescence efﬁciency of 57.3%and an impressive long operational lifetime(LT_(95)∼30,000 h,initial luminance of 1000 cd m^(-2))are *** study provides a new strategy for designing more efﬁ-cient and stable electroluminescent devices through linker aggregation engineering in donor–acceptor molecules.

关键词： acceptor stacking balanced carrier transfer host materials long device lifetime thermally activated delayedﬂuorescence

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