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Reliability of organic light-emitting diodes in low-temperature environment

Chinese Physics B 2020年第12期29卷 112-118页

作者： Saihu Pan Zhiqiang Zhu Kangping Liu Hang Yu Yingjie Liao Bin Wei Redouane Borsali Kunping Guo School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China School of Mechatronic Engineering and Automation Key Laboratory of Advanced Display and System ApplicationsMinistry of EducationShanghai UniversityShanghai 200072China Universdity of Grenoble Alpes CNRSCERMAVF-38000 GrenobleFrance London Centre for Nanotechnology University College LondonLondon WC1H 0AHUK

Organic light-emitting diode(OLED)is an electroluminescent technology that relies on charge-carrier dynamics and is a potential light source for variable environmental ***,by exploiting a self-developed low-temperature testing system,we investigated the characteristics of hole/electron transport,electro-optic conversion efficiency,and operation lifetime of OLEDs at low-temperature ranging from-40℃to 0℃and room temperature(25℃).Compared to devices operating at room temperature,the carrier transport capability is significantly decreased with reducing temperature,and especially the mobility of the hole-transporting material(HTM)and electron-transporting material(ETM)at-40℃decreases from 1.16×10-6 cm2/V·s and 2.60×10-4 cm2/V·s to 6.91×10-9 cm2/V·s and 1.44×10-5 cm2/V·s,***,the temperature affects differently on the mobilities of HTM and ETM,which favors unbalanced charge-carrier transport and recombination in OLEDs,thereby leading to the maximum current efficiency decreased from 6.46 cd·A-1 at 25℃to 2.74 cd·A-1 at-40℃.In addition,blue fluorescent OLED at-20℃has an above 56%lifetime improvement(time to 80%of the initial luminance)over the reference device at room temperature,which is attributed to efficiently dissipating heat generated inside the device by the low-temperature environment.

关键词： organic light-emitting diodes(OLEDs) low temperature reliability operation lifetime

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Investigation of Low Temperature Amorphous (in X Ga1- X )2o3 Films Modulated by Indium Content for Optimization in Solar-Blind Photodetector

SSRN

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SSRN 2024年

作者： Wang, Chen Zhang, Yu-Chao Fan, Teng-Min Yi, Cong Zhou, Chen-Hao Kang, Pin-Chun Wu, Wan-Yu Wuu, Dong-Sing Lai, Feng-Min Lien, Shui-Yang Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology School of Opto-electronic and Communication Engineering Xiamen University of Technology Xiamen361024 China National Measurement and Testing Center for Flat Panel Display Industry Xiamen Institute of Measurement and Testing Xiamen361004 China Department of Materials Science and Engineering National United University Miaoli360302 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

In this study, bandgap engineering of amorphous (InxGa1-x)2O3 alloy films fabricated at room temperature using pulsed laser deposition and alloy targets with different indium contents from 0% to 50% have been investigated. The effect of indium content on the characteristics of (InxGa1-x)2O3 films and the performance of metal-semiconductor-metal solar-blind photodetectors have been explored in detail. The moderate number of indium atoms introduced into Ga2O3 can obtain a flat surface morphology and adjusted bandgap to enhance the performance of solar-blind photodetector. When the excessive indium atoms were incorporated into the film, the obviously In-rich (InxGa1-x)2O3 alloy nano-clusters are observed on the film surface despite of the low growth temperature. It can be attributed to the segregation phenomenon because of the solid solubility limitation for indium in Ga2O3. Both of dark current and photocurrent of (InxGa1-x)2O3 photodetector increase with the incremental indium content mainly attributed to enhanced oxygen deficiency. As a result, the solar-blind photodetector can achieve an optimal performance using a balanced indium content of 20% with an extremely low dark current of 4.4×10-12 A, a responsivity of 10.8 mA/W, a substantial on/off current ratio of 1.5×104 and a short rise/decay time of 0.33 s/0.54 s. © 2024, The Authors. All rights reserved.

关键词： Temperature

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Learning multiscale correlations for human motion prediction

arXiv

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arXiv 2021年

作者： Zhou, Honghong Guo, Caili Zhang, Hao Wang, Yanjun Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks Beijing China China Telecom Dict Application Capability Center China

In spite of the great progress in human motion prediction, it is still a challenging task to predict those aperiodic and complicated motions. We believe that capturing the correlations among human body components is the key to understand the human motion. In this paper, we propose a novel multiscale graph convolution network (MGCN) to address this problem. Firstly, we design an adaptive multiscale interactional encoding module (MIEM) which is composed of two sub modules: scale transformation module (STM) and scale interaction module (SIM) to learn the human body correlations. Secondly, we apply a coarse-to-fine decoding strategy to decode the motions sequentially. We evaluate our approach on two standard benchmark datasets for human motion prediction: Human3.6M and CMU motion capture dataset. The experiments show that the proposed approach achieves the state-of-the-art performance for both short-term and long-term prediction especially in those complicated action category. We make codes publicly available at https://***/zhouhongh/MGCN. © 2021, CC BY-NC-ND.

关键词： Motion estimation

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Investigation of amorphous (InxGa1-x)2O3 alloy films modulated by indium content for optimization in solar-blind photodetector

SSRN

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SSRN 2024年

Bandgap engineering using (InxGa1-x)2O3 alloy structure can be a promising technique towards enhancing the performance of solar-blind photodetectors due to its tunable optical and electronic properties. In this study, amorphous (InxGa1-x)2O3 alloy films have been fabricated at room temperature using pulsed laser deposition and alloy targets with different indium contents from 0% to 50%. The effect of indium content on the characteristics of (InxGa1-x)2O3 films and the performance of metal-semiconductor-metal solar-blind photodetectors have been explored in detail. As the increase of indium content, the narrowing bandgap may be contributed to the lower forbidden gap of In2O3 and the lattice disorder induced by the corporation of In into the films. The moderate number of indium atoms introduced into Ga2O3 can obtain a flat surface morphology and adjusted bandgap to enhance the performance of solar-blind photodetector. When the excessive indium atoms were incorporated into the film, the obviously In-rich (InxGa1-x)2O3 alloy nano-clusters are observed on the film surface despite of the low growth temperature. It can be attributed to the segregation phenomenon because of the solid solubility limitation for indium in Ga2O3. Both of dark current and photocurrent of (InxGa1-x)2O3 photodetector increase with the incremental indium content mainly attributed to enhanced oxygen deficiency. As a result, the solar-blind photodetector can achieve an optimal performance as balanced indium content rising to 20% with an extremely low dark current of 4.4×10-12 A, a responsivity of 10.8 mA/W, a substantial on/off current ratio of 1.5×104 and a short rise/decay time of 0.33 s/0.54 s. © 2024, The Authors. All rights reserved.

关键词： Photons

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THE REMOTE SENSING IMAGE GEOMETRICAL MODEL of BP NEURAL NETWORK

THE REMOTE SENSING IMAGE GEOMETRICAL MODEL of BP NEURAL NETW...

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2020 International Conference on Geomatics in the Big Data Era, ICGBD 2020

作者： Yue, C.Y. Sun, T. Xie, J.F. Beijing Institute of Space Mechanics and Electricity Beijing China Beijing Key Laboratory of Advanced Optical Remote Sensing Technology Beijing China Key Laboratory of Technology in Geo-spatial Information Processing and Application System Aerospace Information Research Institute Chinese Academy of Sciences Beijing China Land Satellite Remote Sensing Application Center Ministry of Natural Resources of P. R. China Beijing China

Imagery geometry models (IGMs) of the high-resolution satellite images (HRSIs) are always of great interest in the photogrammetry and remote sensing community for the raising new kinds of sensors and imaging systems. Especially the generalized sensor models (GSMs) have been widely used for positioning of satellite images, and the accuracy are already validated. Since Back propagation (BP) neural network is a better choice for the two key reasons of the replacement of physical sensor models by generalized sensor models, numerous mathematical estimations for every specialized sensor, and secret equations of the IGMs. Experiments are carried out to test the approximation accuracy of the new generalized sensor model. And the experimental results show that, the BP neural network is of extremely high accuracy for satellite imagery photogrammetric restitution. © 2020 C. Y. Yue et al.

关键词： Backpropagation

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A Low Delay AES Round Transform Architecture Using Constant Matrix Multiplications Merging Technologies

A Low Delay AES Round Transform Architecture Using Constant ...

引用

IEEE Conference on Industrial Electronics and applications (ICIEA)

作者： Xinxing Zheng Xiaoqiang Zhang Fan Yang Mingyu Xu Han Yan College of Information Engineering Wuhu Institute of Technology Wuhu China Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Wuhu China Engineering Research Center of Vehicle-Mounted Display Integration System Wuhu China College of Electrical Engineering Anhui Polytechnic University Wuhu China

ISBN: (纸本)9781665409858

This paper presents a low delay architecture design method for the hardware implementation of the advanced Encryption Standard (AES) algorithm. The proposed architecture is designed by using constant matrix multiplications (CMM) merging technologies. To reduce the area cost in hardware implementations, S-box/InvS-box is usually implemented with composite field arithmetic (CFA) technologies. In this paper, CMM in CFA-based S-box/InvS-box are further merged with constant coefficient multiplications in MixColumns/ InvMixColumns, which can also be expressed as CMM forms. By the merging, the delay of the hardware implementation of encryption round transform is reduced at the cost of slight area cost increasing, and both delay and area cost are reduced in hardware implementations of decryption round transform. Hardware complexities analysis indicates that our designs have less delay compared with previous works.

关键词： Industrial electronics Costs Design methodology Merging Transforms Hardware Delays

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Engineering grain boundaries in monolayer molybdenum disulfide for efficient water-ion separation

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Science (New York, N.Y.) 2025年第6735期387卷 776-782页

作者： Shen, Jie Aljarb, Areej Cai, Yichen Liu, Xing Min, Jiacheng Wang, Yingge Wang, Qingxiao Zhang, Chenhui Chen, Cailing Hakami, Mariam Fu, Jui-Han Zhang, Hui Li, Guanxing Wang, Xiaoqian Chen, Zhuo Li, Jiaqiang Dong, Xinglong Shih, Kaimin Huang, Kuo-Wei Tung, Vincent Shi, Guosheng Pinnau, Ingo Li, Lain-Jong Han, Yu Physical Sciences and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Department of Physics King Abdulaziz University Jeddah Saudi Arabia KAUST Catalysis Center King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing China Shanghai Applied Radiation Institute Shanghai Key Laboratory of Atomic Control and Application of Inorganic 2D Supermaterials Shanghai University Shanghai China Department of Mechanical Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Department of Civil Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Imaging and Characterization Core Lab King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Department of Chemical System Engineering School of Engineering University of Tokyo Tokyo Japan Center for Electron Microscopy South China University of Technology Guangzhou China School of Emergent Soft Matter South China University of Technology Guangzhou China Catalyst Center of Excellence (CCoE) Research and Development Center Saudi Aramco Dhahran Saudi Arabia Center for Sustainability and Energy Technologies Chang Gung University Taoyuan Taiwan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai China University of Chinese Academy of Sciences Wenzhou China

Two-dimensional (2D) materials have long been considered as ideal platforms for developing separation membranes. However, it is difficult to generate uniform subnanometer pores over large areas on 2D materials. We report that the well-defined eight-membered ring (8-MR) pores, typically formed at the boundaries of two antiparallel grains of monolayer molybdenum disulfide (MoS2), can serve as molecular sieves for efficient water-ion separation. The density of grain boundaries and, consequently, the number of 8-MR pores can be tuned by regulating the grain size. Optimized MoS2 membranes outperformed the state-of-the-art membranes in forward osmosis tests by demonstrating both ultrahigh water/sodium chloride selectivity and exceptional water permeance. Creating precise pore structures on atomically thin films through grain boundary engineering presents a promising route for producing membranes suitable for various applications.

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Multi-Dimensional Linear Scanning Algorithm for Silicon-based Micro-OLED 17

Multi-Dimensional Linear Scanning Algorithm for Silicon-base...

引用

17th China International Forum on Solid State Lighting and 2020 International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2020

作者： Zhou, Houda Guo, Aiying Wang, Fei Zhang, Jianhua Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechanical Engineering and Automation Shanghai University Shanghai200072 China School of Microelectronics Shanghai University Shanghai200072 China

ISBN: (数字)9780738111889

ISBN: (纸本)9780738111889

With the continuous development of display devices and technologies, as a new type of display device, silicon-based Micro-OLED has become a new type of display device in the fields of augmented reality, virtual reality, etc. due to its high brightness, self-luminous, low power consumption, and rich color display. In this paper, the research on the driving scanning algorithm of silicon-based Micro-OLED is carried out. Based on the linearity of the traditional PWM scanning algorithm, the sensitivity parameters of the human eye at different gray levels are added to the randomized gray mapping function. The optimization search is carried out by the combination of degree mapping, and finally a multiple linear scanning algorithm suitable for high refresh rate and high gray level is proposed. Through experiments, the multivariate linear scanning algorithm proposed in this paper has higher linearity than the optimal scanning algorithm, and the scanning efficiency reaches 100%. It has the advantages of reducing the driving frequency and increasing the display frame rate. © 2020 IEEE.

关键词： Augmented reality

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Simulation study on thermal mechanical properties of 4×4 Micro-LED array in flip-chip bonding process

Simulation study on thermal mechanical properties of 4×4 Mi...

引用

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

作者： Xiaoxiao Ji Fei Wang Luqiao Yin Jianhua Zhang Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronic Engineering and Automation Shanghai University Shanghai China School of microelectronics Shanghai University Shanghai China

ISBN: (纸本)9781665495479

With the advent of the Micro-light-emitting diodes, it has become the focus of display and visible light communication research. However, as the LED chip size shrinks, the difficulty of integration increase gradually. Nowadays, the integration of Micro- LEDs in display is still a challenge for commercialization. In this work, we conducted a comparative study by finite element method simulation to reveal the influencing factors of bonding yield. The results show that stress concentrates at the junction of the bumps and electrodes of Micro-LED chips, and the stress concentration at the corner of Micro-LED array is more seriously. By altering the parameters of bumps, such as shapes and materials to reduce the stress and stress concentration. Numerical simulate results provide theoretical basis for reducing stress and stress concentration and optimizing the bump shape.

关键词： Shape Tin Light emitting diodes Silicon Indium Bonding Stress

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Research on panoramic illumination imaging system based on SURF algorithm

Research on panoramic illumination imaging system based on S...

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

作者： Fei Wang Xiaoxiao Ji Luqiao Yin Aiying Guo Jianhua Zhang School of microelectronics Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai China School of Mechatronic Engineering and Automation Shanghai University Shanghai China

ISBN: (纸本)9781665495479

Underwater lighting systems and imaging systems are mainly used in underwater pipeline internal inspection, underwater environment information collection, resource detection, etc. This article explores a panoramic lighting imaging system based on an underwater environment. Mainly from the intelligent lighting system, panoramic imaging system, and system integration optimization. The intelligent lighting system mainly explores a high-brightness intelligent lighting device with a high-brightness lighting system. The imaging system mainly works in conjunction with the lighting system. The imaging system mainly collects 250° panoramic picture information and 250° video information for scientific research and other tasks. Provide appropriate information and data. Finally, system integration optimization and joint work are carried out.

关键词： Temperature Splicing Lighting Imaging system integration Streaming media Real-time systems

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