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Ultra-high brightness Micro-LEDs with wafer-scale uniform GaN-on-silicon epilayers

Light(science & Applications) 2024年第12期13卷 3041-3051页

作者： Haifeng Wu Xiao Lin Qin Shuai Youliang Zhu Yi Fu Xiaoqin Liao Yazhou Wang Yizhe Wang Chaowei Cheng Yong Liu Lei Sun Xinyi Luo Xiaoli Zhu Liancheng Wang Ziwei Li Xiao Wang Dong Li Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsHunan Institute of Optoelectronic IntegrationCollege of Materials Science and EngineeringSchool of Physics and ElectronicsHunan University410082 ChangshaChina Innovision Technology(Suzhou)Co.Ltd 215000 SuzhouChina Lattice Power(Jiangxi)Corp. 330029 NanchangChina College of Mechanical and Electrical Engineering Central South University410083 ChangshaChina Beijing Digital Optical Device IC Design Co.Ltd 100015 BeijingChina School of Physics and Electronics Hunan Normal University410081 ChangshaChina

Owing to high pixel density and brightness,gallium nitride(GaN)based micro-light-emitting diodes(Micro-LEDs)are considered revolutionary display technology and have important application prospects in the fields of micro-display and virtual ***,Micro-LEDs with pixel sizes smaller than 10μm still encounter technical challenges such as sidewall damage and limited light extraction efficiency,resulting in reduced luminous efficiency and severe brightness ***,we reported high-brightness green Micro-displays with a 5μm pixel utilizing highquality GaN-on-Si ***-inch wafer-scale uniform green GaN epilayer is first grown on silicon substrate,which possesses a low dislocation density of 5.25×10^(8)cm^(-2),small wafer bowing of 16.7μm,and high wavelength uniformity(standard deviation STDEV<1 nm),scalable to 6-inch *** on the high-quality GaN epilayers,green Micro-LEDs with 5μm pixel sizes are designed with vertical non-alignment bonding *** atomic sidewall passivation method combined with wet treatment successfully addressed the Micro-LED sidewall damages and steadily produced nano-scale surface textures on the pixel top,which unlocked the internal quantum efficiency of the high-quality green GaN-on-Si ***-high brightness exceeding 107 cd/m2(nits)is thus achieved in the green Micro-LEDs,marking the highest reported ***,integration of Micro-LEDs with Si-based CMOS circuits enables the realization of green Micro-LED displays with resolution up to 1080×780,realizing high-definition playback of movies and *** work lays the foundation for the mass production of high-brightness Micro-LED displays on large-size GaN-on-Si epi-wafers.

关键词： sizes uniform luminous

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Influence of the ratio of sintering aids on the properties of porous Si3N4 ceramics fabricated by digital light processing

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Ceramics International 2023年第20期49卷 33004-33010页

作者： Wu, Ya-Ru Tian, Chong Wu, Jia-Min Huang, Hai-Lu Liu, Chun-Lei Lin, Xin Cheng, Li-Jin Shi, Yu-Sheng State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan430074 China Wenzhou Key Laboratory of Microwave Communication Materials and Devices Wenzhou Advanced Manufacturing Institute of HUST Wenzhou325035 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi'an710072 China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University Shaanxi Xi'an710072 China School of Mechanical Engineering Hebei University of Technology Tianjin300401 China

The sintering aids play an important role in affecting the properties of porous Si3N4 ceramics. However, there are few researches on the properties of porous Si3N4 ceramics fabricated by digital light processing (DLP) with different ratios of sintering aids. In this paper, porous Si3N4 ceramics with different ratios of sintering aids (Y2O3-Al2O3) were formed by DLP technology. The influence of Y2O3-Al2O3 ratios on the properties of Si3N4 slurry and porous ceramic was studied systematically. The ratio of Y2O3-Al2O3 had little effect on the rheology and cure depth of Si3N4 slurry due to the low addition of sintering aids. The increase of Y2O3-Al2O3 ratio promoted the anisotropic growth of β-Si3N4. When the ratio of Y2O3-Al2O3 was 9:1, the aspect ratio of β grains reached the maximum. As the ratio of Y2O3-Al2O3 powders increased, the linear shrinkage of porous Si3N4 ceramics showed an increasing and then decreasing trend in three directions. When the Y2O3-Al2O3 ratio was 3:7, the shrinkage rate in the length, width and height direction reached the maximum (27.03%, 30.27% and 40.02%, respectively). The bulk density and flexural strength exhibited an initial increase followed by a subsequent decrease, while the porosity showed the opposite trend. When the Y2O3-Al2O3 ratio was 9:1, the porosity reached a maximum of 28.1%. And the bulk density and flexural strength were 2.42 g/cm3 and 421.58 MPa, respectively. This study is of great significance as it lays the experimental foundation in the performance control of porous Si3N4 ceramics fabricated by DLP. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Sintering

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design,synthesis and SAR study of 2-aminopyridine derivatives as potent and selective JAK2 inhibitors

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Chinese Chemical Letters 2022年第6期33卷 2969-2974页

作者： Dandan Liu Huan Ge Fangling Xu Yufang Xu Wenjun Liu Honglin Li Lili Zhu Yanyan Diao Zhenjiang Zhao Shanghai Key Laboratory of New Drug Design School of PharmacyEast China University of Science and TechnologyShanghai 200237China Research and Development Department Jiangzhong Pharmaceutical Co.Ltd.Nanchang 330096China

The abnormal activation of JAK2 kinase is closely related to the occurrence and progression of myeloproliferative neoplasms(MPNs).At present,there is still an obvious unmet medical need for selective JAK2 inhibitors in *** this paper,a class of 2-aminopyridine derivatives as potent and selective JAK2 inhibitors was obtained by combining drug design,synthesis and structure-activity relationship studies based on the previously identified lead *** them,21 b exhibited high inhibitory activity against JAK2 with an IC_(50)of 9 nmol/L,moreover,it showed 276-and 184-fold selectivity over JAK1 and JAK3,***,21 b had a significant antiproliferative activity against HEL cells,and also inhibited the phosphorylation of JAK2 and its down-stream signaling *** results indicated that2-aminopyridine compound 21 b had the potential to be developed as a selective JAK2 inhibitor for further study.

关键词： JAK2 Selectivity Inhibitors Cancer Structure-activity relationships

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Dynamic mesophase transition induces anomalous suppressed and anisotropic phonon thermal transport

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npj Computational Materials 2024年第1期10卷 239-248页

作者： Linfeng Yu Kexin Dong Qi Yang Yi Zhang Zheyong Fan Xiong Zheng Huimin Wang Zhenzhen Qin Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082People’s Republic of China College of Physical Science and Technology Bohai UniversityJinzhou121013People’s Republic of China Hunan Key Laboratory for Micro-Nano Energy Materials&Device and School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105 HunanChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China Research Institute of Hunan University in Chongqing Chongqing401133China Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou511300 Guangdong ProvinceChina

The physical/chemical properties undergo significant transformations in the different states arising from phase ***,due to the lack of a dynamic perspective,transitional mesophases are largely underexamined,constrained by the high resource burden of first ***,usingmolecular dynamics(MD)simulations empowered by the machine-learning potential,we proffer an innovative paradigm for phase transition:regulating the thermal transport properties via the transitional mesophase triggered by a uniaxial force *** investigate the mechanical,electrical,and thermal transport properties of the two-dimensional carbon allotrope of Janus-graphene with strain-engineered phase ***,we found that the transitional mesophase significantly suppresses the thermal conductivity and induces strong anisotropy near the phase transition *** machine-learning-driven MD simulations,we achieved highprecision atomic-level simulations of *** results show that thermal vibrationinduced intermediate amorphous or interfacial phases induce strong and anisotropic interfacial thermal *** investigation not only endows uswith a novel perspective onmesophases during phase transitions but also enhances our holistic comprehension of the evolution of material properties.

关键词： thermal transition transport

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A Multi-Scale Decomposition MLP-Mixer for Time Series Analysis 50th

A Multi-Scale Decomposition MLP-Mixer for Time Series Analys...

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50th International Conference on Very Large Data Bases, VLDB 2024

作者： Zhong, Shuhan Song, Sizhe Zhuo, Weipeng Li, Guanyao Liu, Yang Chan, S.-H. Gary Department of Computer Science and Engineering The Hong Kong University of Science and Technology Hong Kong Guangdong Provincial Key Laboratory IRADS and Department of Computer Science BNU-HKBU United International College China Guangdong Enterprise Key Laboratory for Urban Sensing Monitoring and Early Warning Guangzhou Urban Planning and Design Survey Research Institute China

Time series data, including univariate and multivariate ones, are characterized by unique composition and complex multi-scale temporal variations. They often require special consideration of decomposition and multi-scale modeling to analyze. Existing deep learning methods on this best ft to univariate time series only, and have not sufciently considered sub-series modeling and decomposition completeness. To address these challenges, we propose MSD-Mixer, a Multi-Scale Decomposition MLP-Mixer, which learns to explicitly decompose and represent the input time series in its diferent layers. To handle the multi-scale temporal patterns and multivariate dependencies, we propose a novel temporal patching approach to model the time series as multi-scale patches, and employ MLPs to capture intra- and inter-patch variations and channel-wise correlations. In addition, we propose a novel loss function to constrain both the mean and the autocorrelation of the decomposition residual for better decomposition completeness. Through extensive experiments on various real-world datasets for fve common time series analysis tasks, we demonstrate that MSD-Mixer consistently and signifcantly outperforms other state-of-the-art algorithms with better efciency. © 2024, VLDB Endowment. All rights reserved.

关键词： Mixers (machinery)

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A short text clustering study integrating context-awareness and contrast learning 8

A short text clustering study integrating context-awareness ...

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8th International Conference on Information Systems Engineering, ICISE 2023

作者： Zhang, Qiaonan Liu, Yuan Jiangnan University School of Artificial Intelligence and Computer Science Wuxi214000 China Jiangnan University Jiangsu Province Key Laboratory of Media Design and Software Technology Wuxi214000 China

ISBN: (纸本)9798350307009

Traditional text representation techniques will produce high-dimensional and sparse vectors for short texts since they have fewer words, which increases the likelihood of noise interference and lowers the accuracy of short text clustering. An alternative model, CASA-Bert-K, is investigated to overcome the aforementioned issues. First, In order to add contextual features into the text representation, context-awareness self-attention networks are combined with Bert. Secondly, To de-optimize the representation of short texts, a simple and effective data augmentation approach to contrast learning is introduced. The text representation module and the clustering module are jointly trained to optimize both text representation and clustering in order to further improve the clustering accuracy. The experimental findings show the researched model's effectiveness in raising the accuracy rate through the use of three datasets in the tests. © 2023 IEEE.

关键词： Cluster analysis

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KNOWLEDGE TRANSFER FROM SIMPLE TO COMPLEX: A SAFE AND EFFICIENT REINFORCEMENT LEARNING FRAMEWORK FOR AUTONOMOUS DRIVING DECISION-MAKING

arXiv

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arXiv 2024年

作者： Zhou, Rongliang Huang, Jiakun Li, Mingjun Li, Hepeng Cao, Haotian Song, Xiaolin State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University China College of Intelligence Science and Technology National University of Defense Technology China

A safe and efficient decision-making system is crucial for autonomous vehicles. However, the complexity of driving environments limits the effectiveness of many rule-based and machine learning approaches. Reinforcement Learning (RL), with its robust self-learning capabilities and environmental adaptability, offers a promising solution to these challenges. Nevertheless, safety and efficiency concerns during training hinder its widespread application. To address these concerns, we propose a novel RL framework, Simple to Complex Collaborative Decision (S2CD). First, we rapidly train the teacher model in a lightweight simulation environment. In the more complex and realistic environment, teacher intervenes when the student agent exhibits suboptimal behavior by assessing actions’ value to avert dangers. We also introduce an RL algorithm called Adaptive Clipping Proximal Policy Optimization Plus, which combines samples from both teacher and student policies and employs dynamic clipping strategies based on sample importance. This approach improves sample efficiency while effectively alleviating data imbalance. Additionally, we employ the Kullback-Leibler divergence as a policy constraint, transforming it into an unconstrained problem with the Lagrangian method to accelerate the student’s learning. Finally, a gradual weaning strategy ensures that the student learns to explore independently over time, overcoming the teacher’s limitations and maximizing performance. Simulation experiments in highway lane-change scenarios show that the S2CD framework enhances learning efficiency, reduces training costs, and significantly improves safety compared to state-of-the-art algorithms. This framework also ensures effective knowledge transfer between teacher and student models, even with suboptimal teachers, the student achieves superior performance, demonstrating the robustness and effectiveness of S2CD. Copyright © 2024, The Authors. All rights reserved.

关键词： Reinforcement learning

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design of Integrated Coil Structure for Simultaneous Wireless Information and Power Transfer Applied to Electric Power Inspection Robot

Design of Integrated Coil Structure for Simultaneous Wireles...

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International Conference on Wireless Power Transfer, ICWPT 2022

作者： Huang, Chen Xia, Nenghong Mao, Xike Hua, Chengchao Xu, Xiaoying Yuan, Zhipeng Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design Centre Wuhan430064 China School of Electrical Engineering Shanghai Electric Power University Shanghai200000 China

ISBN: (纸本)9789819906307

Wireless power transfer is gradually becoming a new choice for power supply for electric power inspection robots with its security and stability. In practical applications, in order to achieve autonomous charging of the robots, stable information interaction between the transmitting and receiving sides is required, among which magnetic near-field wireless information transfer technology can be an effective method for information interaction. However, cross-coupling between the power and information channels affects transmission efficiency. In this paper, we propose an integrated structure for simultaneous wireless information and power transfer based on magnetic near-field coupling. The circular coil is used for energy transmission. Two pairs of DD coils connected in series and vertically placed inside the circular coil for information transmission, which together form an integrated structure. The resulting integrated structure enables the decoupling of the power and information channels. The simulation results show that the interference between the power channel and the information channel is only 4nH, accounting for only 0.03% of the mutual inductance between the power channels. Through experiments, it is verified that the influence of the power channel and the information channel can be ignored. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Energy transfer

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An Analysis for Thermal Conductivity of Graphene/Polymer Nanocomposites 1

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17th International Conference on Bio-Inspired Computing: Theories and Applications, BIC-TA 2022

作者： Liang, Zirui Huang, Weigang Rao, Runzhe Li, Fang Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan430070 China China Ship Development and Design Center Harbin China

ISBN: (数字)9789819915491

ISBN: (纸本)9789819915484

Graphene/polymer nanocomposites have attracted much more attention due to its high thermal conductivity up to 5300 W/mK, as well as the lightweight, noncorrosive and elastic properties of the polymer matrix. At present, the existing experimental results have shown that the thermal conductivity of graphene/polymer nanocomposites can be effectively improved by increasing the aspect ratio of graphene, or increasing the transverse size and thickness of graphene at the same time under the condition of constant aspect ratio. In this study, the influence of the number of GNSs layers and size on the isotropic thermal conductivity of the composites are revealed based on Maxwell's effective medium theory by considering the effect of the number of GNSs layers on the interface thermal resistance and the thermal conductivity of GNSs. The expressions of equivalent thermal conductivity for the isotropic GNSs/polymer composites are obtained. The numerical results obtained in this paper are agree well with experimental data. And these results show that the thermal conductivity of the isotropy composites increases with the increase of GNSs layers, concentration and aspect ratio. However, the increment of thermal conductivity for the composites decreases gradually with the increase of GNSs layers. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Graphene

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Maize Prolonged Prophase 1 is essential for meiotic progression in pollen mother cells

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The Crop Journal 2025年第1期13卷 170-180页

作者： Lingling Pan Yunfei Li Xueli An Zhiqi Xin Zhaobin Dong Weiwei Jin Wei Huang State Key Laboratory of Maize Bio-breeding National Maize Improvement CenterFrontiers Science Center for Molecular Design BreedingDepartment of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China National Engineering Laboratory of Crop Stress Resistance Breeding School of Life SciencesAnhui Agricultural UniversityHefei 230036AnhuiChina Research Institute of Biology and Agriculture University of Science and Technology BeijingBeijing 100083China Tianjin Key Laboratory of Intelligent Breeding of Major Crops Fresh Corn Research Center of BTHTianjin Agricultural UniversityTianjin 300384China

Meiosis,a critical process for sexual reproduction,requires precise regulation to ensure the correct progression of meiotic *** yeast and animals,errors in meiotic recombination and homologous chromosomes synapsis bring a surveillance mechanism named pachytene checkpoint to prevent pachytene ***,most plant mutants with defects in meiotic prophase I continue cell cycle progression,which hindered the characterization of factors controlling the prophase I to metaphase I ***,we characterized a male-sterile mutant in maize,prolonged prophase1(pp1),which exhibited pachytene and diakinesis arrest in male meiosis,and abnormal chromatin *** mapbased cloning,the PP1 gene was isolated as a PHD family transcription factor,and its transcripts of PP1 were preferentially accumulated in tapetum and male germline cells during *** analysis of the pp1 mutant revealed downregulation of genes associated with chromatin assembly,cell cycle,and male meiosis,correlating with observed meiotic arrest and chromatin condensation *** findings highlight the role of PP1 in maize microsporogenesis,and providing more insights into the mechanisms regulating the meiotic progression in maize.

关键词： Maize Male sterile Meiosis PHD-finger protein

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