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Lead-Free Nanocrystals: Bright Blue Light-Emitting Doped Cesium Bromide Nanocrystals: Alternatives of Lead-Free Perovskite Nanocrystals for White LEDs (advanced Optical Materials 10/2019)

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advanced Optical Materials 2019年第10期7卷

作者： Zhiwen Yang Zhao Jiang Xinyi Liu Xiaochuan Zhou Jianhua Zhang Wanwan Li State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China

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Metal Halide Perovskites: Metal Halide Perovskite Nanorods: Shape Matters (Adv. Mater. 46/2020)

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advanced Materials 2020年第46期32卷

作者： Chengxi Zhang Jiayi Chen Sheng Wang Lingmei Kong Simon W. Lewis Xuyong Yang Andrey L. Rogach Guohua Jia Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University 149 Yanchang Road Shanghai 200072 P. R. China Curtin Institute of Functional Molecules and Interfaces School of Molecular and Life Sciences Curtin University GPO Box U1987 Perth WA 6845 Australia Department of Materials Science and Engineering & Centre for Functional Photonics (CFP) City University of Hong Kong Kowloon Hong Kong SAR P. R. China

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Randomized consensus based distributed kalman filtering over wireless sensor networks

arXiv

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arXiv 2018年

作者： Qin, Jiahu Wang, Jie Shi, Ling Kang, Yu Department of Automation University of Science and Technology of China Hefei230027 China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Automation State Key Laboratory of Fire Science Institute of Advanced Technology University of Science and Technology of China Hefei230027 China Key Laboratory of Technology in Geo-Spatial Information Processing and Application System Chinese Academy of Sciences Beijing100190 China

This paper is concerned with developing a novel distributed Kalman filtering algorithm over wireless sensor networks based on randomized consensus strategy. Compared with centralized algorithm, distributed filtering techniques require less computation per sensor and lead to more robust estimation since they simply use the information from the neighboring nodes in the network. However, poor local sensor estimation caused by limited observability and network topology changes which interfere the global consensus are challenging issues. Motivated by this observation, we propose a novel randomized gossip based distributed Kalman filtering algorithm. Information exchange and computation in the proposed algorithm can be carried out in an arbitrarily connected network of nodes. In addition, the computational burden can be distributed for a sensor which communicates with a stochastically selected neighbor at each clock step under schemes of gossip algorithm. In this case, the error covariance matrix changes stochastically at every clock step, thus the convergence is considered in a probabilistic sense. We provide the mean square convergence analysis of the proposed algorithm. Under a sufficient condition, we show that the proposed algorithm is quite appealing as it achieves better mean square error performance theoretically than the noncooperative decentralized Kalman filtering algorithm. Besides, considering the limited computation, communication and energy resources in the wireless sensor networks, we propose an optimization problem which minimizes the average expected state estimation error based on the proposed algorithm. To solve the proposed problem efficiently, we transform it into a convex optimization problem. And a sub-optimal solution is attained. Examples and simulations are provided to illustrate the theoretical results. Copyright © 2018, The Authors. All rights reserved.

关键词： Kalman filters

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Full-color fluorescent carbon quantum dots

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Science advances 2020年第40期6卷 eabb6772页

作者： Liang Wang Weitao Li Luqiao Yin Yijian Liu Huazhang Guo Jiawei Lai Yu Han Gao Li Ming Li Jianhua Zhang Robert Vajtai Pulickel M Ajayan Minghong Wu Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China. wangl@*** mhwu@***. Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA. Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China. Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 P. R. China.

Quantum dots have innate advantages as the key component of optoelectronic devices. For white light-emitting diodes (WLEDs), the modulation of the spectrum and color of the device often involves various quantum dots of different emission wavelengths. Here, we fabricate a series of carbon quantum dots (CQDs) through a scalable acid reagent engineering strategy. The growing electron-withdrawing groups on the surface of CQDs that originated from acid reagents boost their photoluminescence wavelength red shift and raise their particle sizes, elucidating the quantum size effect. These CQDs emit bright and remarkably stable full-color fluorescence ranging from blue to red light and even white light. Full-color emissive polymer films and all types of high-color rendering index WLEDs are synthesized by mixing multiple kinds of CQDs in appropriate ratios. The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.

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Hydrothermal synthesis of uniform CdWO4:Eu^3+microrods as single component for UV-based WLEDs

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Journal of Rare Earths 2016年第12期34卷 1179-1187页

作者：雷芳殷录桥施鹰谢建军章蕾范灵聪 School of Materials Science and Enggineering Shanghai UniversityShanghai 200444China Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghai 200072China

A series of single-composition emission-tunable CdWO4：Eu^3＋ uniform size nanorods were synthesized by polyvinylpyrrolidone（PVP） assisted hydrothermal process. The products were measured by powder X-ray diffraction（PXRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, photoluminescence, and fluorescent decay test. The results showed that reaction time, temperature, p H values and Eu^3＋ doped concentration played important roles in determining the morphologies and photoluminescent properties. And we also investigated its use in Ga N LED, warm-white-light could be obtained by the combination of the bright blue light originated from the charge transfer transition in the tungstate groups and the near UV light from LED chip with the red emission from 4f-4f transition of Eu^3＋, respectively. By properly tuning the doping concentration of Eu^3＋, chromaticity coordinates（0.30 0.22） could be achieved under the 380 nm excitation and its color rendering index was 80.6. So it has potential application in warm-WLED and replacing the commercial YAG：Ce phosphor which absence of red band emission.

关键词： CdWO4：Eu3＋ hydrothermal synthesis WLED photoluminescence single-component rare earths

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Photocatalysis: Light-Activated Rapid Disinfection by Accelerated Charge Transfer in Red Phosphorus/ZnO Heterointerface (Small Methods 3/2019)

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Small Methods 2019年第3期3卷

作者： Jun Li Xiangmei Liu Lei Tan Yanqin Liang Zhenduo Cui Xianjin Yang Shengli Zhu Zhaoyang Li Yufeng Zheng Kelvin Wai Kwok Yeung Xianbao Wang Shuilin Wu School of Materials Science & Engineering The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China Tianjin University Tianjin 300072 China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer Materials School of Materials Science & Engineering Hubei University Wuhan 430062 China State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Department of Orthopaedics & Traumatology Li Ka Shing Faculty of Medicine The University of Hong Kong Pokfulam Hong Kong 999077 China

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P-13.2: AMOLED Encapsulation Technology and Prospect

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SID Symposium Digest of Technical Papers 2018年第S1期49卷

作者： Wei Ao Chunhong Li Yan Wang Xiangchao Liu Xiaogang Xin Feng Gao Chaochi Peng Jianhua Zhang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China Kunshan Govisionox Optoelectronics Co. LTD (GVO) Kunshan 215300 Jiangsu P.R. China

The flexible organic light emitting diodes (OLEDs) has attracted a lot of attention because of its very wide and promising application prospect. The flexible encapsulation is a most problem for mass production of flexible OLEDs since their sensitivity to water and oxygen. Traditional flexible encapsulation using plasma enhanced chemical vapor deposition (PECVD) film as the inorganic layer. However owing to the complicated pattern of sub-layer and particles, the poor step coverage of PECVD film results in bad encapsulation properties. Therefore the plasma enhanced atomic layer deposition (PEALD) is studied on account of its better step coverage and lower growth temperature. Firstly, the PECVD SiNx process has been researched to achieve the low water vapor transmission rate (WVTR) (WVTR<5*10-4g m-2day-1) and low stress (<-300MPa). Then we design several flexible encapsulation films with multilayer structures. The PEALD SiOx film is critical in the multilayer encapsulation films to obtain flexible OLED devices with the best air-stability . Through evaluation of the pass rate after 60oC 90% RH and 85 oC 85% RH for 240h, best structure of flexible encapsulation films has been selected and used in our product.

关键词： PEALD PECVD Encapsulation Flexible

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Dynamical analysis of fractional-order financial system with delay 5

Dynamical analysis of fractional-order financial system with...

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5th International Workshop on advanced Computational Intelligence and Intelligent Informatics, IWACIII 2017

作者： Zhang, Zhe Liu, Feng Zhang, Jin Sun, Fenglan Ren, Jie School of Automation China University of Geosciences Wuhan430074 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China College of Electrical and Information Engineering Hunan University Hunan410082 China Research Center of System Theory and Application Chongqing University of Posts and Telecommunications Chongqing400065 China

This paper we investigates the problem of stability and bifurcation of fractional-order financial system time-delay via the Lyapunov stability judgment method and application of impulse control method. Finally, a numerical simulation example is provided to verify the effectiveness and the benefit of the proposed stability and bifurcation criterion.

关键词： Bifurcation (mathematics)

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High-brightness blue organic light emitting diodes with different types of guest-host systems

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Optoelectronics Letters 2016年第2期12卷 89-92页

作者：王肖张敬爽彭翠云郭坤平魏斌张浩 School of Materials Science and Engineering Shanghai University Shanghai 200072 China Langfang Polytechnic Institute Langfang 065001 China Key Laboratory of Advanced Display and System Application Ministry of Education of China Shanghai UniversityShanghai 200072 China

We demonstrate high-brightness blue organic light emitting diodes(OLEDs) using two types of guest-host systems. A series of blue OLEDs were fabricated using three organic emitters of dibenz anthracene(perylene), di(4-fluorophenyl) amino-di(styryl) biphenyl(DSB) and 4,4'-bis[2-(9-ethyl-3-carbazolyl)vinyl]biphenyl(BCzV Bi) doped into two hosting materials of 4,4'-bis(9-carbazolyl) biphenyl(CBP) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole(PBD) as blue emitting layers, respectively. We achieve three kinds of devices with colors of deep-blue, pure-blue and sky-blue with the Commission Internationale de L'Eclairage(CIE) coordinates of(0.16, 0.10),(0.15, 0.15) and(0.17, 0.24), respectively, by employing PBD as host material. In addition, we present a microcavity device using the PBD guest-host system and achieve high-purity blue devices with narrowed spectrum.

关键词： guest biphenyl brightness coordinates colors normalized Internationale vinyl butyl biochemistry

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Improvement of barrier performance in thin film encapsulation for organic light-emitting diodes by a prior planarization process

Improvement of barrier performance in thin film encapsulatio...

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第十九届国际电子封装技术会议(ICEPT 2018)

作者： Cunping Qin Xingwei Ding Jianhua Zhang Jun Yang Tao Xu School of Mechatronic Engineering and Automation Shanghai University Shanghai China School of Material Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai Univers

The organic/inorganic hybrid barriers were fabricated to encapsulate the organic light-emitting ***2O3 as inorganic layer was deposited by atomic layer deposition(ALD)and polydimethoxysilane(PDMS)as organic layer was prepared by the spin-coating *** was found that the optimized encapsulation structure with a prior planarization process had a better barrier performance with a lower water vapor transmission rate improved effectively from 4.95 × 10-1 gm-2 day-1 of Al2O3/PDMS films to 7.30 × 10-3 gm-2 day-1 of the hybrid PDMS/Al2O3/PDMS films at 60℃ and a relative humidity of 90%and a longer luminance decay *** improvements were attributed to the surface planarization of encapsulation basement including the coverage of particles by the prior spin-coating process,reducing the defects of inorganic film in process,and the hydrophobic surface of the outermost polymer lowering the adsorption of water vapor.

关键词： Organic/inorganic hybrid barriers Organic light-emitting diodes Planarization process Water vapor transmission rate

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