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第七届全国暨华人有机分子和聚合物发光与光电特性学术会议

作者： Jun Wang Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education.Shanghai 200072 People ''s Republic of China

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Photoresponses Improvement of ZnO Thin Film Transistor by Using a HfO2-Al2O3 Double Dielectrics

Photoresponses Improvement of ZnO Thin Film Transistor by Us...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Bowen Che Yongpeng Zhang Xingwei Ding Key Laboratory of Advanced Display and System Application Ministry of Education (Shanghai University) School of Mechatronics and Automation (Shanghai University) Shanghai China

ISBN: (数字)9781728168265

ISBN: (纸本)9781728168272

In this work, we have fabricated two bottom-gate zinc oxide thin film transistors (TFTs) with single-layer HfO 2 and double-layer HfO 2 -Al 2 O 3 dielectrics by atomic layer deposition (ALD). The TFT with HfO 2 -Al 2 O 3 dielectric exhibited better electrical characteristics, such as a higher field effect mobility of 6.1 cm 2 /V·s and a lower subthreshold swing of 0.124 V/decade. At the same time, the optical properties is also improved significantly with larger responsivity (6.05 A/W) and UV-to-visible rejection ratio (6.05×10 4 ). These results are attributed to lower interface trap states between channel layer and dielectric layer by an Al 2 O 3 interlayer.

关键词： Hafnium compounds Dielectrics Zinc oxide Thin film transistors II-VI semiconductor materials Aluminum oxide Logic gates

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Computational Analysis of Quantum Dots as Color Conversion Layer for Micro-LED applications

Computational Analysis of Quantum Dots as Color Conversion L...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Pengsen Lin Xiaoxiao Ji Luqiao Yin Jianhua Zhang School of Materials Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronics and Automation Shanghai University Shanghai China

ISBN: (纸本)9781665495479

We propose a simulation scheme for studying quantum dot (QD) light effects of full-color micro-light-emitting-diode (micro-LED) arrays. We have studied the influence of QD thickness and concentration on light efficiency. The results show that the QD concentration and thickness have an impact on the light efficiency. When the thickness of the QD is 5 µm, or the maximum light conversion efficiency can be obtained when the concentration is 0.1 mol/L. By analyzing the light field distribution of different QD thicknesses, the light crosstalk phenomenon is observed. This kind of crosstalk can cause blurry display images and should be avoided.

关键词： Analytical models Image color analysis Computational modeling Simulation Quantum dots Crosstalk Optical imaging

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Tool Path Generation Method for Three-dimensional Vibration-assisted Machining 16

Tool Path Generation Method for Three-dimensional Vibration-...

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16th IEEE International Conference on Mechatronics and Automation, ICMA 2019

作者： Wang, Guilian Lv, Bingrui Liu, Bin Mu, Haozhi Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China Tianjin Laboratory of Control Theory and Applications in Complicated System Tianjin300384 China School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9781728116983

In this paper, a new tool path generation method is proposed for the 3D (three-dimensional) vibration-assisted 6-DOF (six degree of freedom) machine tool machining system. The tool feed path is generated by the tangent point method and the coordinate transformation theory. It is worth noting that this method needle is only used when the tool and workpiece surface topography can be mathematically described. Finally, a numeric simulation method is used to simulate the tool path which is required when machining workpiece surfaces with different topography tools. The results show that the tool path generation method is widely applicable to tools and workpieces of various shapes, and it is of great significance to reveal the influences of different tool shapes on the tool path. © 2019 IEEE.

关键词： Machine tools

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A compact V-band planar wideband bandpass filter based on Liquid Crystal Polymer substrates

A compact V-band planar wideband bandpass filter based on Li...

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Electronics system-Integration Technology Conference, ESTC

作者： Xia Zhang Dan Kuylenstierna Johan Liu Peng Cai Cristina Andersson James Morris Herbert Zirath Department of Microtechnology and Nanoscience Chalmers University of Technology Goteborg Sweden Key Laboratory o fAdvanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China School of Electronics Jiangxi University of Finance and Economics Nanchang China Department of Electrical & Computer Engineering Portland State University Portland OR USA

The move to higher frequencies has stimulated the development of the materials and integration techniques of the RF/microwave/millimeter (mm)-wave areas. Until now, materials commonly used at high frequency are either expensive or have inadequate performance. Liquid crystal polymers (LCPs), have attracted much more attention as advanced candidates as RF/microwave/mm-wave substrate materials for commercial wireless applications due to their combination of features and performance. In this paper, a compact V-band planar microstrip bandpass filter with sharp-rejection, low insertion-loss and wide-bandwidth based on the dual-mode ring resonator is proposed. The filter is fabricated on a LCP substrate by using standard processing technology. The proposed filter exhibits a return loss level better than 10 dB, an insertion loss of 5 dB, and a 3-dB bandwidth of 30%. The simulated and measured results are compared and agree well, which shows the promising potential of LCP laminates for flexible RF/microwave/mm-wave substrates.

关键词： Wideband Band pass filters Liquid crystal polymers Crystalline materials Radio frequency Microwave filters Resonator filters Microwave theory and techniques Microstrip filters Microstrip resonators

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Simultaneous Improvement of Efficiency and Stability of Organic Light-Emitting Diodes Utilizing Bilayered Hole-Injection Layer Composed of Vanadium Oxide and Pedot:Pss

SSRN

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SSRN 2024年

作者： Zhang, Han Zhu, Wenqing Wu, Ming Feng, Zhiyin Huang, Lu Chen, Yipeng Dong, Yijie Yang, Yue School of Materials Science and Engineering Shanghai University 99 Shangda Road Shanghai200444 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Road Shanghai200072 China

The poor hole-injection and consequent carrier imbalance are regarded to be important factors that seriously restricts the device performance of organic light-emitting diodes (OLEDs). In this work, a solution-processable inorganic/organic bilayer composed of vanadium oxide (VOx)/poly(3,4-ethylenedioxythiophene):poly-(styrene sulfonate) (PEDOT:PSS) is reported as a hole-injection layer (HIL) in OLED to customize matched interfacial energy level alignment. This strategy not only facilitates the formation of a smooth PEDOT:PSS overlayer in the VOx/PEDOT:PSS bilayer, but also enhances the hole-injection across the interface through the construction of step-wise energy levels and hence improves carrier balance in device. Consequently, it was found that the device with VOx/PEODT:PSS bilayered HIL exhibited a maximum current efficiency of 67.23 cd A-1 and a maximum external quantum efficiency of 19.17%, which were obviously superior to those of the reference devices with individual VOx HIL (54.85 cd A-1, and 15.58%, respectively) and PEDOT:PSS HIL (58.74 cd A-1, and 16.84%, respectively). Meanwhile, the stability of bilayered HIL-based device was improved substantially because the stable VOx layer effectively prevented the corrosion of indium tin oxide (ITO) anode by acidic PEDOT:*** study highlights a promising bilayer for developing high-performance OLEDs. © 2024, The Authors. All rights reserved.

关键词： Tin oxides

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Effects of the matrix shrinkage and filler hardness on the thermal conductivity of TCA

Effects of the matrix shrinkage and filler hardness on the t...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Cong Yue Yan Zhang Zhili Hu Johan Liu Zhaonian Cheng Key Laboratory of Advanced Display and System Applications Ministry of Education SMIT Center School of Mechatronics Engineering and Automation Shanghai University Shanghai China SMIT Center & Bionano Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden

Thermal conductive adhesives (TCA) have been widely used as the thermal interface material (TIM). The TCA are usually epoxy or silicone based mixtures containing fillers. The epoxy in TCA also applies a pressure on the filler particles as it shrinks during the curing process. This pressure leads to an increase in the contact area between the filler particles and thus improves the thermal conductivity. In our attempt to discover the effect of filler modulus on the contact areas between two particles we constructed a cell model assay. In order to study the different epoxy characteristics, 28 cases were simulated with different mixtures of epoxy and filler. The thermal conductivity of each case was calculated by FEM. When the shrinkage was higher than 1%, TCA with a filler modulus of 83 Gpa (silver) has the largest contact area, which suggests silver has the best TCA performance among the studied materials. Furthermore the viscoelasticity of the epoxy was simulated to evaluate the fully relax time of epoxy and the effect on the thermal conductivity of TCA.

关键词： Thermal conductivity Silver Conductive adhesives Conducting materials Curing Phase change materials Thermal engineering Heat transfer Electrons Temperature

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Nano-Thermal Interface Material with CNT Nano-Particles For Heat Dissipation Application

Nano-Thermal Interface Material with CNT Nano-Particles For ...

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2008 International Conference on Electronic Packaging Technology & High Density Packaging (ICEPT-HDP 2008), vol.2

作者： Li Xu Cong Yue Johan Liu Yan Zhang Xiu Zhen Lu Zhaonian Cheng Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center School of Mechatronics Engineering and Automation Shanghai University Shanghai China SMIT Center & Bionano Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden

Heat dissipation of electronic packages has become one of the limiting factors to miniaturization. The removal of the heat generated is a critical issue in electronic packaging. With the development of thermal management, thermal interface material (TIM) plays a more and more important role in electronics packaging. A new nano-TIM with nanofibers prepared by using electrospinning has been suggested in recent years. In this experiment study, the carbon nanotube (CNT) nano-particles were added into the polymer solution before the electrospinning to improve the thermal conductivity of nano-TIM. The polymer solution of polyurethane was used for present electrospinning. The effects of a number of process parameters in the electrospinning were studied in this work. Different variables such as the distance between needle tip and collector, the voltage applied, and CNT nano-particles content were studied. The Scanning Electron Microscopy (SEM) was used to characterize nano-TIMs with CNT nano-particles.

关键词： Materials Polymers Distance measurement Needles Scanning electron microscopy Heat sinks Electronics packaging

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Mosaic Generation in H.264 Compressed Domain

Mosaic Generation in H.264 Compressed Domain

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International Conference on Intelligent Sensing and Information Processing (ICISIP)

作者： Zhi Liu Zhaoyang Zhang Liquan Shen Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai China School of Communication and Information Engineering Shanghai University Shanghai China

This paper presents an efficient approach to mosaic generation in H.264 compressed domain. The proposed mosaic generation approach fully exploits several new coding characteristics of the H.264 standard, i.e., variable block size and the quarter-pel accuracy of motion vector (MV). A uniformly sampled and normalized MV field is first derived from the H.264 compressed video. Then an affine model is used to estimate the global motion from the normalized MV field, and the model parameters are iteratively refined based on outlier rejection scheme. Finally, the most recent and reliable background pixels from multiple frames are warped to the reference frame and then used to integrate the final mosaic. Experimental results demonstrate that the proposed approach is efficient for mosaic generation in H.264 compressed domain.

关键词： Video compression Motion estimation Video sequences Object segmentation Iterative algorithms Image motion analysis Parameter estimation Character generation Indexing Video coding

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Performance analysis of region of interest video transmission system

Performance analysis of region of interest video transmissio...

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2007 IET Conference on Wireless, Mobile and Sensor Networks (CCWMSN07)

作者： Yongfang Wang Zhaoyang Zhang Zhi Liu School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai China

We investigate the video transmission efficiency of channel code, modulation mode and layered space time code for region of interest video transmission system. Excellent channel code achieves more coding gains, suitable modulation mode adaptively overcomes different channel fading and layered space time code achieves not only coding gain but only diversity gain. Based on the above analysis, we propose an adaptive video transmission system according to channel environment and video constructed quality require. We derive an analytic bound for the error probability, and conduct experiments for H.264 interest of region video streaming. It is shown that the proposed system enhances the PSNR performance of region of interest significantly by adaptive choice of channel code, modulation mode, and layered space time code in the wireless channel.

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