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Rational Design of Oxygen-Enriched Carbon Dots with Efficient Room-Temperature Phosphorescent Properties and High-Tech Security Protection Application

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ACS Sustainable Chemistry & Engineering 2019年第24期7卷 19918-19924页

作者： Yu Han Ming Li Jiawei Lai Weitao Li Yijian Liu Luqiao Yin Lianqiao Yang Xiaogang Xue Robert Vajtai Pulickel M. Ajayan Liang Wang Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University No.99 Shangda Road Baoshan District Shanghai 200444 P. R. China Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 United States Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education No.149 YanChang Road Jingan District Shanghai 200072 P. R. China School of Materials Science and Engineering Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology 1 Jinji Road Guilin 541004 P. R. China

Room-temperature phosphorescent (RTP) carbon dots (CDs) have been fascinated by a lot of scholars because of their stable triplet excited states and environmental friendliness. Herein, novel fluorescent oxygen-enriched CDs were synthesized by a simple one-step solvothermal approach, which can be applied in cell imaging directly as a nontoxic fluorescent probe. When mixing the CDs with polyvinyl alcohol, the composite exhibits excellent RTP performance, which has the exciting prospect of applications in security protection. The observed RTP is attributed to the lone pair electrons provided by oxygen-rich functional groups of CDs. Benefitting from the n → π* transition and triplet exciton filling, the C–O–C groups of CDs play a significant role in their ultralong RTP performance. Our finding creates an avenue for advanced security protection technology based on metal-free RTP carbon nanomaterials.

关键词： Composites Phosphorescence Fluorescence Cadmium sulfide Materials

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Synthesis of ZnO nanorods based on electrospinning technology

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Journal of Physics: Conference Series 2020年第3期1549卷

作者： Xiuzhen Lu Yongqian Sun Ziwei Jiang Maomao Zhang Yang Lin SMIT Center School of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China

A new method for fabrication of ZnO nanorods was reported. ZnO nanorods were synthesized by electrospinning technology and heat treatment with polyvinyl alcohol (PVA) and Zinc acetate as precursor. After heat treatment of ZnO electrospun nanofibers, ZnO nanorods were obtained. Morphology of ZnO nanorods was characterized by Scanning electron microscopy (SEM). Various morphologies, such as sphere, flower and plane composed of ZnO nanorods were observed. Transmission electron microscopy (TEM) images demonstrated ZnO nanorods are a single crystalline structure with a diameter of 100-180 nm. The hexagonal wurtzite structure of ZnO nanorods was determined by X-ray diffraction (XRD) pattern and Raman spectra.

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Deep-Blue Electroluminescence of Perovskites with Reduced Dimensionality Achieved by Manipulating Adsorption-Energy Differences

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Angewandte Chemie 2022年第40期134卷

作者： Dr. Jianchao Dong Dr. Feifei Lu Dr. Dongyuan Han Dr. Jie Wang Dr. Ziang Zang Dr. Lingmei Kong Dr. Yu Zhang Dr. Xue Ma Dr. Jianheng Zhou Dr. Huiyu Ji Prof. Xuyong Yang Prof. Ning Wang Key Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education College of Physics Jilin University Changchun 130012 P. R. China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University 149 Yanchang Road Shanghai 200072 P. R. China

The lagging development of deep-blue perovskite light-emitting diodes (PeLEDs) heavily impedes their practical applications in full-color display due to the absence of spectrally stable emitters and the mismatch of carrier injection capacity. Herein, we report highly efficient deep-blue PeLEDs through a new chemical strategy that addresses the dilemma for simultaneously constant electroluminescence (EL) spectra and high-purify phase in reduced-dimensional perovskites. The success lies in the control of adsorption-energy differences between phenylbutylamine (PBA) and ethylamine (EA) interacting with perovskites, which facilitates narrow n -value distribution. This approach leads to an increased exciton binding energy and enhanced surface potential, hence improving radiative recombination. As a result, an external quantum efficiency of 4.62 % is achieved in PeLEDs with a stable EL peak at 457 nm, demonstrating the best reported result for deep-blue PeLEDs so far.

关键词： Adsorption Energy Deep-Blue Emission Perovskites Reduced Dimensionality

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Effects of substrate temperature on the properties of heavy Ga-doped ZnO transparent conductive film by RF magnetron sputtering

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Journal of Physics: Conference Series 2009年第1期188卷

作者： Shufang Wang Xifeng Li Jianhua Zhang Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China School of Mechanical & Electronic Engineering and Automation Shanghai University Shanghai 200072 China Corresponding author

Gallium-doped zinc oxide (GZO) transparent conductive thin films were deposited on glass substrate by RF magnetron sputtering using a ceramic ZnO target with 10 wt. % Ga2O3 doped. The effects of substrate temperature on structural, electrical and optical properties of the films were investigated. X-ray diffraction (XRD) measurements indicated that GZO films were polycrystalline and strongly c-axis oriented. The surface roughness evaluated in terms of RRMS measured by atomic force microscope (AFM) was 1.8 nm for the smoothest surface obtained at 250 °C. The electrical resistivity decreases with increasing substrate temperature and the lowest resistivity obtained was 5.8×10-4 Ωcm at 350 °C. The average transmittance in the visible region was over 90%. The carrier concentration increased with substrate temperature increasing, and the highest mobility value was 22.1 cm2v-1s-1.

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Flip Chip Assembly Using Carbon Nanotube Bumps and Anisotropic Conductive Adhesive Film

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ECS Transactions 2010年第1期27卷

作者： Xia Zhang Teng Wang Pär Berggren Si Chen Johan Liu Shanghai University Chalmers University of Technology SHT Smart High-Tech AB SMIT Ltd Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China

Carbon Nanotube (CNT) has been proposed as a promising candidate material to build next generation flip chip interconnects in electronics. In this paper, flip chip assembly using CNT bumps and ACF is performed. To realize CNT-based interconnects, post-growth processes including deposition of metallic layers on CNT bundles and low temperature transfer of CNT bundles have been developed to overcome the problems of the high growth temperature of CNT as well as the poor adhesion between CNT bumps and substrates. Moreover, ACF has been used to assemble the CNT bumps on another Si substrate. The electrical test is performed also to verify the good contact between CNT bumps and ACF.

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Light-Emitting Diodes: Fast Postmoisture Treatment of Luminescent Perovskite Films for Efficient Light-Emitting Diodes (Small 15/2018)

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Small 2018年第15期14卷

作者： Haoran Wang Xiaomin Li Mingjian Yuan Xuyong Yang Key Laboratory of Advanced Display and System Applications of Education of Ministry Shanghai University 149 Yanchang Road Shanghai 200072 China College of Chemistry Nankai University 94 Weijin Road Tianjin 300071 China

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The Effect of Functionalized Silver on Rheological and Electrical Properties of Conductive Adhesives

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ECS Transactions 2011年第1期34卷

作者： Qiong Fan Huiwang Cui Chune Fu Dongsheng Li Xin Tang Zhichao Yuan Lilei Ye Johan Liu Ministry of Education and SMIT Center Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center Shanghai University No.149 Yanchang Road Shanghai Shanghai 200072 China Shang Da Rui Hu Microsystem Integration Technology Co.Ltd Shanghai University SHT Smart High Tech AB Shanghai University SE-412 96 Gothenburg Gothenburg 41296 Sweden

This research used low molecular surface modifiers, and observed that chemisorptions took place through the formation of a bond between silver surface and an adsorbed molecule, which improved the dispersion of silver flakes in the organic resin. Several different functionalizers, such as thioglycolic acid, silane and di-acid, were used to functionalize the silver surface. Results of shear viscosity, bulk resistivity etc. showed that by using these low molecular organic functionalizers, isotropic conductive adhesives (ICAs) with lower shear viscosity and better electrical conductivity at high silver fillers content were obtained. The adipic acid had the greatest effect on the rheological and electrical property of ICAs, so its weight percentage in silver flakes was also optimized; ICAs displayed the maximum electrical conductivity when there was 0.5 wt% of silver flakes.

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High-order Finite-Volume Central Targeted ENO Family Scheme for Compressible Flows in Unstructured Meshes

arXiv

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arXiv 2023年

作者： Ma, Qihang Chong, Kai Leong Feng, Feng Zhang, Jianhua Wang, Bofu Zhou, Quan Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering Science Shanghai University Shanghai200072 China China Academy of Aerospace Science and Innovation Beijing100176 China Shanghai Institute of Aircraft Mechanics and Control Zhangwu Road Shanghai200092 China School of Microelectronics Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China Shanghai Frontier Science Center of Mechanoinformatics Shanghai University Shanghai200072 China

The high-order Target ENO (TENO) scheme, known for its innovative weighting strategy, has demonstrated strong potential for complex flow predictions. This study extends the TENO weighting approach to develop non-oscillatory central TENO (CTENO and CTENOZ) family schemes for unstructured meshes. The CTENO schemes employ compact directional stencils, which increase the likelihood of finding stencils within smooth regions. The design is intentionally compact to simplify the implementation of directional stencils. An effective scale separation strategy is adopted using an ENO-like stencil selection method, which employs large central stencils in smooth regions to achieve high-order accuracy, and smaller directional stencils near discontinuities to improve shock-capturing capabilities. Extensive tests involving CWENO, TENO, CTENO, and CTENOZ schemes were conducted to assess their performance in terms of accuracy, robustness, parallel scalability, and computational efficiency. The findings indicate that the proposed CTENO and CTENOZ schemes deliver high-order precision, lower numerical dissipation, and excellent shock-capturing performance. © 2023, CC BY.

关键词： Mesh generation

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Pushing the limit of lithography for patterning two-dimensional lattices in III-V semiconductor quantum wells

Pushing the limit of lithography for patterning two-dimensio...

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IEEE Electron Devices Technology and Manufacturing Conference (EDTM)

作者： N.A. Franchina Vergel C. Post F. Vaurette Y. Lambert D. Yarekha C. Coinon G. Fleury T.S. Kulmala T. Xu L. Desplanque X. Wallart D. Vanmaekelbergh C. Delerue B. Grandidier Univ. Lille CNRS Centrale Lille Univ. Polytechnique Hauts-de-France ISEN-Yncrea Hauts-de-France UMR 8520-IEMN Lille France Debye Institute for Nanomaterials Science Utrecht University The Netherlands Univ. Bordeaux CNRS Bordeaux INP LCPO UMR 5629 Pessac Heidelberg Instruments Nano/SwissLitho AG Technoparkstrasse 1 Zurich Switzerland School of Mechatronic Engineering and Automation Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai China

Building two-dimensional lattices in semiconductor quantum-wells offers the prospect to design distinct energy-momentum dispersions, including conical intersections and nondispersive bands. Here, we compare three lithographic patterning methods, e-beam lithography, block copolymer lithography and thermal scanning probe lithography to produce a honeycomb lattice in an In_0.53Ga_0.47As quantum well. We weigh up the pros and cons of each method to reach lattice constants smaller than 20 nm with a minimum of dispersion in the pore size.

关键词： Limiting Lithography Buildings Lattices Scattering Quantum wells Proximity effects

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Effects of Annealing Treatment on Optical and Electronic Properties of GaN Based LEDs with ITO Films

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ECS Transactions 2012年第1期44卷

作者： Wanjing Wang Xifeng Li Jinsong Zhang Jianhua Zhang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University Shanghai University School of Mechatronics Engineering and Automation Shanghai University Shanghai University No 149 Yanchang Road Shanghai City Shanghai 200072 China

Indium-Tin-Oxide (ITO) film prepared by DC magnetron sputtering was used as a current spread layer for LEDs. After the annealing treatment, the physical prosperities of p-GaN based LED have been investigated. The N2 annealing improved the surface roughness of ITO film to reach the smallest value (8 nm RMS) and exhibited an ohmic contact for ITO/p-GaN interface with the forward voltage decreasing. In comparison with electron beam evaporation, the ITO film prepared by DC magnetron sputtering had better optical and electronic prosperities after the annealing treatment.

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