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基于蒽和三苯胺基D-π-A结构的蓝色荧光材料在有机发光和紫外探测集成器件中的应用

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Science China Materials 2024年第1期67卷 197-204页

作者：董文健白雲水王雅婷赵松许慧侠苗艳勤罗巧王华于军胜 Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯... 详细信息

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯胺(2mTPA)分别为给体,设计并合成了两种可用于OLED-UVOPD器件的蓝色发光分子,TPA-AN和2mTPA-AN.它们的发光峰分别位于474和488 nm处,荧光量子产率为51.1%和46.6%.通过单载流子器件计算得到其电子迁移率分别为3.96×10^(-5)和6.63×10^(-7)cm^(2)V^(-1)s^(-1).基于TPA-AN的OLED器件表现出强的蓝光发射,最大亮度为43,110 cd m^(-2),最大外量子效率(EQE)为8.1%.它们在OLED-UVOPD集成器件中表现出优异的性能,紫外探测率分别为7.18×10^(11)和2.85×10^(12)Jones,最大EQE分别为8.7%和5.9%.

关键词：紫外探测集成器件有机光电材料电子迁移率光电子器件最大亮度蓝色发光 OLED

High-Gain Dual Circularly Polarized Antenna for Air-to-Ground Wireless Link

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Chinese Journal of Electronics 2022年第3期31卷 555-561页

作者： JIANG Hang YAO yuan XIU Tao CHENG Xiaohe yu junsheng CHEN Xiaodong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electronic Engineering and Computer Science Queen Mary University of London

This paper presents an E-band reflector antenna fed by dual circularly polarized feed system. Axial displaced ellipse reflector is adopted for high gain and low blockage mechanisms. The feed system mainly composed of orthomode transducer, iris polarizer and horn antenna, and possesses dual circular polarization. The orthomode transducer offers high isolation performance in broadband by double symmetry and the iris polarizer achieves phase shift by introducing discontinuities. In addition, the ridge and iris in the feed are optimized to be wide enough to fabricate and maintain good mechanical properties in higher frequency band. The entire antenna is simulated and fabricated. The measured gain of 45 ± 1.2 d Bi corresponds to about 52% efficiency. The measured results of reflection coefficients less than-18 d B, isolation over 27 d B, axial-ratio value less than 2.3 d B are achieved from 71 to 86 GHz.

关键词： Dual circularly polarized Reflector antenna Feed system

Macroporous Directed and Interconnected Carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑Charging Anode for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 333-351页

作者： Zhenwei Li Meisheng Han Peilun yu junsheng Lin Jie yu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenUniversity TownShenzhen 518055People’s Republic of China Songshan Lake Materials Laboratory Dongguan Dongguan 523808GuangdongPeople’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion ***,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/C)that are welded on the wall of the macroporous carbon framework(MPCF)by vertical graphene(VG),labeled as MPCF@VG@SiNDs/*** high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/Li+transport channels of VG,and the MPCF impart the MPCF@VG@SiNDs/C more lithium storage sites,rapid Li+transport path,and unique low-strain property during Li+***,the MPCF@VG@SiNDs/C exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode *** assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 C).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关键词： Amorphous Si nanodots Low-strain Fast-charging Lithium-ion batteries

Origami-inspired folding assembly of dielectric elastomers for programmable soft robots

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Microsystems & Nanoengineering 2022年第2期8卷 73-83页

作者： Yanhua Sun Dengfeng Li Mengge Wu Yale Yang Jingyou Su Tszhung Wong Kangming Xu Ying Li Lu Li Xinge yu junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People's Republic of China Chongqing Key Laboratory of Materials Surface&Interface Science Chongqing Co-Innovation Center for Micro/Nano Optoelectronic Materials and DevicesMicro/Nano Optoelectronic Materials and Devices International Science and Technology Cooperation Base of ChinaSchool of Materials Science and EngineeringChongqing University of Arts and SciencesChongqing 402160People's Republic of China Department of Biomedical Engineering City University of Hong KongHong Kong SAR 999077People's Republic of China

Origami has become an optimal methodological choice for creating complex three-dimensional(3D)structures and soft *** simple and low-cost origami-inspired folding assembly provides a new method for developing 3D soft robots,which is ideal for future intelligent robotic ***,we present a series of materials,structural designs,and fabrication methods for developing independent,electrically controlled origami 3D soft robots for walking and soft *** 3D soft robots are based on soft actuators,which are multilayer structures with a dielectric elastomer(DE)film as the deformation layer and a laser-cut PET film as the supporting flexible *** triangular and rectangular design of the soft actuators allows them to be easily assembled into crawling soft robots and pyramidal-and square-shaped 3D *** crawling robot exhibits very stable crawling behaviors and can carry loads while *** by origami folding,the pyramidal and square-shaped 3D soft robots exhibit programmable out-of-plane deformations and easy switching between two-dimensional(2D)and 3D *** electrically controllable origami deformation allows the 3D soft robots to be used as soft manipulators for grasping and precisely locking 3D *** work proves that origami-inspired fold-based assembly of DE actuators is a good reference for the development of soft actuators and future intelligent multifunctional soft robots.

关键词： robot folding dielectric

Stretchable organic electrochemical transistors via threedimensional porous elastic semiconducting films for artificial synaptic applications

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Nano Research 2023年第7期16卷 10206-10214页

作者： yujie Peng Lin Gao Changjian Liu Jinyi Deng Miao Xie Libing Bai Gang Wang yuhua Cheng Wei Huang junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringShanghai Key Laboratory of Lightweight Structural CompositesKey Laboratory of High Performance fibers&productsMinistry of EducationDonghua UniversityShanghai 201620China

Neuromorphic computing targets realizing biomimetic or intelligence systems capable of processing abundant tasks in parallel analogously to our brain,and organic electrochemical transistors(OECTs)that rely on the mixed ionic-electronic synergistic couple possess significant similarity to biological systems for implementing synaptic ***,the lack of reliable stretchability for synaptic OECTs,where mechanical deformation occurs,leads to consequent degradation of electrical ***,we demonstrate stretchable synaptic OECTs by adopting a three-dimensional poly(3-hexylthiophene)(P3HT)/styrene-ethylene-butylene-styrene(SEBS)blend porous elastic film for neuromorphic *** architecture shows the full capability to emulate biological synaptic *** the accumulated layer numbers of porous film enables tunable OECT output and hysteresis,resulting in transition in ***,with a trilayer porous film,large-scale conductance and hysteresis are endorsed for efficient mimicking of memory-dependent synapse *** from the interconnected three-dimensional porous structures,corresponding stretchable synaptic OECTs exhibit excellent mechanical robustness when stretched at a 30%strain,and maintain reliable electrical characteristics after 500 stretching ***,near-ideal weight updates with near-zero nonlinearities,symmetricity in long-term potentiation(LTP)and depression,and applications for image simulation are *** work paves a universal design strategy toward highperformance stretchable neuromorphic computing architecture and could be extended to other flexible/stretchable electronics.

关键词： organic electrochemical transistors(OECTs) artificial synapses porous films flexible electronics neuromorphic computing

Influence of Beam Equilibrium Self-fields on Linear Gain for a Free Electron Laser

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Chinese Physics Letters 1991年第8期8卷 392-395页

作者： yu junsheng LIU Shenggang Southwestern Institute of Physics Chengdu 610041 University of Electronic Science and Technology of China Chengdu 610054

The small-signal linear gain for a combined electromagnetic wiggler and an axial-guide magnetic field free electron laser is derived within the presence of beam equilibrium *** numerical results show that the gain is ... 详细信息

关键词： gain fields wiggler

Microstructure control of organic semiconductors via UV-ozone for high-sensitivity NO2 detection

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Science China(Technological Sciences) 2021年第5期64卷 1057-1064页

作者： HOU SiHui FAN HuiDong WU MengGe yu XinGe yu junsheng State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China Department of Biomedical Engineering City University of Hong KongHong KongChina

Developing high sensitive organic semiconductors(OSCs)in organic thin-film transistors(OTFTs)is the key for OTFT based gas ***,we report a simple processing route of highly sensitive OSCs for high performance OTFT based nitrogen dioxide(NO2)sensors,where the active OSC layer is based on ultraviolet-ozone(UVO)treated poly(3-hexylthiophene-2,5-diyl)(P3HT).Compared to conventional P3HT based OTFT sensors,the reported device exhibits a remarkable improvement of the gas response from 350%to 30000%.The studies in morphologies,chemical compositions and microstructures of the UVOtreated films reveal that a large number of carrier traps generated in the P3HT films is the decisive reason for the enhancement of sensing ***,the optimized device shows great potential of practical applications on the stand points of sensitivity,selectivity,reusability and the ability of recovery,as well as limit of detection of~7.3 *** simple method provides an innovative understanding for the role of the carrier traps in sensing performance and demonstrates a bright future for developing high performance OTFT gas sensors.

关键词： ultraviolet-ozone organic thin-film transistors gas sensors carrier traps nitrogen dioxide

Stretchable,skin-conformable neuromorphic system for tactile sensory recognizing and encoding

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InfoMat 2023年第12期5卷 87-99页

作者： Mengge Wu Qiuna Zhuang Kuanming Yao Jian Li Guangyao Zhao Jingkun Zhou Dengfeng Li Rui Shi Guoqiang Xu Yingchun Li Zijian Zheng Zhihui Yang junsheng yu Xinge yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengduthe People's Republic of China Department of Biomedical Engineering City University of Hong KongHong Kongthe People's Republic of China Laboratory for Advanced Interfacial Materials and Devices School of Fashion and TextilesThe Hong Kong Polytechnic UniversityHong Kongthe People's Republic of China Hong Kong Center for Cerebra-Cardiovascular Health Engineering Hong Kong Science ParkHong Kongthe People's Republic of China College of Science Harbin Institute of TechnologyShenzhenthe People's Republic of China Department of Pathology The Affiliated Hospital of Southwest Medical UniversityLuzhouthe People's Republic of China

Expanding wearable technologies to artificial tactile perception will be of significance for intelligent human-machine interface,as neuromorphic sensing devices are promising candidates due to their low energy consumption and highly effective operating ***-compatible and conformable features are required for the purpose of realizing wearable artificial tactile ***,we report an intrinsically stretchable,skin-integrated neuromorphic system with triboelectric nanogenerators as tactile sensing and organic electrochemical transistors as information *** integrated system provides desired sensing,synaptic,and mechanical characteristics,such as sensitive response(~0.04 kPa^(-1))to low-pressure,short-and long-term synaptic plasticity,great switching endurance(>10000 pulses),symmetric weight update,together with high stretchability of 100%*** neural encoding,demonstrations are capable of recognizing,extracting,and encoding features of tactile *** work provides a feasible approach to wearable,skin-conformable neuromorphic sensing system with great application prospects in intelligent robotics and replacement prosthetics.

关键词： neural encoding neuromorphic sensing system organic electrochemical transistors tactile sensation triboelectric nanogenerators

Analysis of axially displaced elliptical antenna using hybrid method

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The Journal of China Universities of Posts and Telecommunications 2015年第6期22卷 51-56,93页

作者： Liu Xiaoming yu junsheng Chen Xiaodong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electronic Engineering and Computer Science Queen Mary University of London

Axially displaced elliptical （ADE） antenna is an evolved version of Gregorian antenna, bearing advantages of minimized blockage and relatively uniform field distribution. However, the analysis of the electrical performance of this type of antenna is a difficulty to be addressed properly. To enable the simulation of such type of reflector antenna, a hybrid method is derived for predicting the farfield of ADE antennas. Closed formulae are firstly derived for the calculation of the near field of ADE antennas based on vector analysis and the law of energy conservation. These formulae avoid time-consuming surface current integration and the current singularity on the vertex of the sub-reflector. In addition, the nature of vector analysis makes the hybrid method be capable of predicting vector electric field precisely. Furthermore, since these formulae are in explicit manner, no ray tracing process is required. The farfield is then predicted using Huygens equivalent method, assuring the accuracy in the farfield. Compared to published experimental results in the literature, the proposed method agrees well with the measurement in the main beam region. In comparison to physical optic method, the computational efficiency is much improved.

关键词： ADE antenna hybrid method Huygens equivalent method