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IEEE Electron Device Letters 2025年

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 Co. Ltd China Zhangjiang Lab Shanghai Advanced Research Institute Shanghai China Fudan University School of Microelectronics Shanghai 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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Motion attention based frame-level bit allocation scheme for H.264 09

Motion attention based frame-level bit allocation scheme for...

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1st International Conference on Internet Multimedia Computing and Service, ICIMCS 2009

作者： Shen, Liquan Liu, Zhi Zhang, Zhaoyang Yan, Hongbo Key Lab. of Advanced Display and System Application Ministry of Education Shanghai University China

ISBN: (纸本)9781605588407

Rate control plays a major role in video coding and multimedia streaming. A well-designed rate control scheme should pursue both the objective quality and subjective quality. However, existing H.264 rate control algorithms mainly aim at improving the objective quality without consideration the perception of human view system (HVS). In this paper, we propose a novel rate control algorithm based on local motion attention. The bits allocated to each frame are proportional to the local motion activity in it, and more bits are allocated to the frame with strong local motion attention. Experiment results show that our method not only enhances the coding quality in the frames with strong local motion attention but also reduces the temporal PSNR fluctuation across frames up to 22.15%. Copyright 2009 ACM.

关键词： Image coding

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An adaptive and fast H.264 multi-frame selection algorithm based on information from previous searches

An adaptive and fast H.264 multi-frame selection algorithm b...

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IEEE International Conference onMultimedia and Expo, ICME 2007

作者： Liquan, Shen Zhi, Liu Zhaoyang, Zhang Xuli, Shi Key Lab. of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China

ISBN: (纸本)1424410177

The H.264 video coding standard adopts multiple reference frames for motion estimation. This new feature improves the prediction accuracy of inter-coding blocks significantly, but it results in a considerable increase in encoder complexity, mainly regarding to multi-frame selection and motion estimation. The reference software JM adopts the full search scheme, and the increased computation is in proportion to the number of searched reference frames. However, the reduction of prediction residues is highly dependent on the nature of sequences, not on the number of searched frames. In this paper, we propose an adaptive and fast multi-frame selection algorithm (AFMFS) based on motion vectors and SAD information coming from previous searches to adaptively terminate the procedure of multiple reference frames selection. Compared with the full search algorithm and the flexible multi-reference frame search criterion (FMRFSC), simulation results show that the proposed algorithm can save 55.28% and 40.23% computation cost on average, respectively, while it still maintains similar coding efficiency. © 2007 IEEE.

关键词： Motion estimation

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Visual attention based video object segmentation in MPEG compressed domain

Visual attention based video object segmentation in MPEG com...

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Ning, Zuowu Zhang, Zhaoyang Liu, Zhi School of Communication and Information Engineering Shanghai University China Key Lab of Advanced Display and System Application Shanghai University Ministry of Education China

ISBN: (纸本)9780863418365

A novel approach of visual attention based video object segmentation in MPEG compressed domain is proposed in this paper. DCT coefficients and motion vectors (MVs) are firstly parsed from compressed streams. Analysis of the scene texture is then proposed to decide the best appropriate information for region growing. MVs are exploited to perform region growing if texture is complex, otherwise DC coefficients and MVs are used together to perform region growing. Meanwhile, MVs of I frames are calculated by backward projection of MVs of subsequent P frames, then global motion compensation is performed using the MVs of I frames to obtain local MVs. Subsequently statistical region growing is exploited to segment the image into homogeneous regions. Finally an improved attention model is proposed to extract visual attention objects, which is based on position, clearness and local MVs. The attention model makes the segmentation results more accordant with human's perception. The experimental results conducted on standard test sequences demonstrate the efficient, real-time, robust performance of the proposed approach.

关键词： Motion compensation

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An Efficient Hardware Implementation for Intra Prediction of AVS Encoder

An Efficient Hardware Implementation for Intra Prediction of...

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2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Qitong Yang Zhaoyang Zhang Guowei Teng Liquan Shen Key Lab.Of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China

This paper describes our techniques to design the intra-prediction of AVS encoder for HDTV applications. The whole design is optimized in both the algorithm and architecture levels. On the algorithm level, since the Plane mode is the most area-costly one, it is temporarily ignored. And SATD is lastly chosen as mode decision to balance the hardware implementation with performance of Rate and Distortion. On the architecture level, in addition to five-parallel system, a new scheduling of encoding process is arranged to avoid the idle cycles together by ping-pong memory architecture between the intra-prediction and entropy coding. As a result, the proposed architecture can be implemented by 11750 Slices, achieves real-time processing of HD(1920×1088) frames at a rate of 30 jps in 100 MHz operation frequency.

关键词： Hardware Encoding Pixel Algorithm design and analysis Entropy coding Computer architecture Random access memory

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Hardware Implementation of Transform and Quantization for AVS Encoder

Hardware Implementation of Transform and Quantization for AV...

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2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Leirui Wang Zhaoyang Zhang Guowei Teng Liquan Shen Xuli Shi Key Lab.Of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China

Multimedia applications need larger and larger bandwidth. The only way to face the demands is to provide better and faster video compression standard. Thus, A VS is created in China. To address the need for hardware acceleration of its computationally intensive parts, high throughput hardware architectures for fast computation of the 2-D Transform Quantization Inverse Quantization and Inverse Transform are presented in this paper. In addition, two high performance system architectures are presented. The proposed hardware architectures are incorporated into two different hardware systems implemented on a Virtex 4 Pro FPGA. Simulation results show that both two hardware system architectures that are incorporated proposed architectures could provide satisfactory performances.

关键词： Transforms Quantization Computer architecture Hardware Pixel Discrete cosine transforms Microprocessors

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Object segmentation using graph cuts for the H.264 compressed video with moving background

Object segmentation using graph cuts for the H.264 compresse...

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2008 11th IEEE International Conference on Communication Technology, ICCT 2008

作者： Lu, Yu Zhang, Zhaoyang Liu, Zhi Shi, Xuli School of Communication and Information Engineering Shanghai University Shanghai China Key Lab. of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

ISBN: (纸本)9781424422517

This paper proposed a novel approach to segment objects from the H.264 compressed video with moving background. At first, the noisy motion vectors are eliminated from the motion field by vector median filtering. Then the predicted motion field reconstructed by backward estimation is used to accumulate the motion field, which is followed by global motion compensation. After that, the hypothesis testing is used for initial region classification. Finally, the graph cuts technique is applied to partition objects by minimizing the energy function formulated by the model of Markov Random Field. The experimental results demonstrate efficient performance and good segmentation quality of the proposed method. © 2008 IEEE.

关键词： Median filters

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Improved H.264 GOP-level bit allocation by incremental PID algorithm

Improved H.264 GOP-level bit allocation by incremental PID a...

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Shen, Liquan Zhang, Zhaoyang Li, Ying Liu, Zhi Key Lab. of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China School of Computer Engineering and Science Shanghai University Shanghai 200072 China

ISBN: (纸本)9780863418365

Since the current rate control schemes in H.264 do not present the capability of efficient GOP-level bit allocation, the video quality varies greatly for sequences with the scene change or the scene complexity varying from one GOP to another. To overcome the limitation, we propose a novel rate control scheme based on incremental PID algorithm. The incremental PID algorithm is introduced to minimize video quality variations in GOP-level bit allocation. Extensive simulation results show that the proposed rate control scheme, without expensive computational complexity added, decreases the average video quality variations by 15.07%.

关键词： Quality control

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Electrothermal-coupled simulation of electrodes with flip-chip LEDs

Electrothermal-coupled simulation of electrodes with flip-ch...

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The 15th International Conference on Electronic Packaging Technology (ICEPT 2014) ) (第十五届电子封装技术国际会议)

作者： Jinlong Zhang Wen Gu Jianhua Zhang Peng Song Luqiao Yin School of Mechatronics and Automation Shanghai UniversityShanghai 200072China Key Lab.of Advanced Key Lab.of Advanced Display and System Applications(Shanghai University) Ministry of Education P.O.B

The current density of GaN-based light emitting diode(LED)plays a strong impact on the light output and heat transfer *** this paper,the finite element simulation software ANSYS is used to simulate the thermoelectric performance of LED chip with different electrode *** conventional LED chip and the flip-chip(FC)LED with bumps are compared in terms of the current density and the temperature *** improve the thermoelectric property of FC-LED,a structure of FC-LED with vias is proposed and simulated by the *** improve the uniformity of current density of the FC-LED with vias,the electrode structure is optimized with symmetrical *** simulated results show that the optimized structure obtains a better uniform temperature distribution,lower highest temperature and lower temperature *** confirm the relationship between the current density uniformity and the temperature distribution,the current density uniformity of different chip structures are quantitatively *** results show that the optimized FC-LED with vias shows the most uniform current density,indicating that the thermal properties are closely related to the uniformity of current density.

关键词： LED Current density Electrothermal-coupled Ansys

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Synthesis and properties of novel N,C,N terdentate skeleton based on 1,3-di(pyridin-2-yl)benzene moiety-new tricks for old dogs

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Chinese Chemical Letters 2019年第11期30卷 1951-1954页

作者： Shuai Tan Xiugang Wu Yanqiong Zheng Yafei Wang a Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications Jiangsu Key Laboratory of Environmentally Friendly Polymeric MaterialsJiangsu Collaboration Innovation Center of Photovoltaic Science and EngineeringSchool of Materials Science&EngineeringChangzhou UniversityChangzhou 213164China b College of Chemistry Key Lab of Environment-Friendly Chemistry and Application of the Ministry of EducationXiangtan UniversityXiangtan 411105China c Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China

Utilization of intermolecular Friedel-Crafts and intramolecular condensation reaction,novel 1,3-di-(pyridine-2-yl)benzene(N,C,N terdentate)skeleton with electro-withdrawing group in 6'position of pyridyl and a cyclization between 6'position of pyridyl and 6 position of benzyl ring were firstly designed and *** structures of these novel N,C,N terdentate were confirmed by NMR,MS and X-ray single *** photophysical properties of these compounds were briefly explored.

关键词： 1,3-Di(pyridin-2-yl)benzene skeleton Platinum complex Synthesis Intramolecular cyclization

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