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Synthesis of graphene quantum dot/metal–organic framework nanocomposites as yellow phosphors for white light-emitting diodes

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New Journal of Chemistry 2018年第7期42卷 5083-5089页

作者： Dengyu Pan Lijun Wang Zhen Li Bijiang Geng Chen Zhang Jing Zhan Luqiao Yin Liang Wang School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 P. R. China Key Laboratory of Advanced Display and System Applications Shanghai University Shanghai P. R. China Institute of Nanochemistry and Nanobiology Shanghai University Shanghai 200444 P. R. China

A new luminescent composite material GQD@ZIF-8 was obtained by incorporating edge-sulfonated graphene quantum dots (GQDs) as an active fluorescent species into nanocrystals of the zeolitic imidazolate framework (ZIF-8) as both a stabilizer and a carrier by a simple, rapid, and eco-friendly approach. The as-synthesized GQD@ZIF-8 composite not only exhibits excellent fluorescence properties in aqueous solutions but can also emit bright fluorescence in the solid state due to the effective encapsulation by ZIF-8. The GQD@ZIF-8 nanocomposite was used as a novel yellow phosphor in the fabrication of white light-emitting diodes (WLEDs) based on a blue-light LED chip with a proximate CIE coordinate (0.33, 0.33) of highly pure white light and a relatively high color-rendering index.

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Chlorine-Substituent Regulation in Dopant-Free Small-Molecule Hole-Transport Materials Improves the Effi ciency and Stability of Inverted Perovskite Solar Cells

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Transactions of Tianjin University 2024年第4期30卷 314-323页

作者： Xinyi Liu Xiaoye Zhang Zhanfeng Li Jinbo Chen Yanting Tian Baoyou Liu Changfeng Si Gang Yue Hua Dong Zhaoxin Wu Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China School of Electrical Engineering University of South ChinaHengyang 421001China College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024China Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center Ningxia Sinostar Display Material Co.Ltd.Yinchuan 750003China Organic Semiconductor Centre EaStCHEM School of ChemistryUniversity of St AndrewsFife KY169STUK Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China

Although doped hole-transport materials(HTMs)off er an effi ciency benefi t for perovskite solar cells(PSCs),they inevi-tably diminish the ***,we describe the use of various chlorinated small molecules,specifi cally fl uorenone-triphenylamine(FO-TPA)-x-Cl[x=para,meta,and ortho(p,m,and o)],with diff erent chlorine-substituent positions,as dopant-free HTMs for *** chlorinated molecules feature a symmetrical donor-acceptor-donor structure and ideal intramolecular charge transfer properties,allowing for self-doping and the establishment of built-in potentials for improving charge *** effi cient hole-transfer interfaces are constructed between perovskites and these HTMs by strategi-cally modifying the chlorine ***,the chlorinated HTM-derived inverted PSCs exhibited superior effi ciencies and air ***,the dopant-free HTM FO-TPA-o-Cl not only attains a power conversion effi ciency of 20.82% but also demonstrates exceptional stability,retaining 93.8%of its initial effi ciency even after a 30-day aging test conducted under ambient air conditions in PSCs without *** fi ndings underscore the critical role of chlorine-substituent regulation in HTMs in ensuring the formation and maintenance of effi cient and stable PSCs.

关键词： Hole-transport materials Inverted perovskite solar cells Chlorinated small molecules Donor–acceptor–donor structure

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The effect of reflow temperature and time on the formation and growth kinetics of Intermetallic Compounds (IMCs) between Sn-0.7Cu -0.4Co eutectic solder and ENIG/Cu substrate finish

The effect of reflow temperature and time on the formation a...

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Electronics system-Integration Technology Conference, ESTC

作者： Lili Zhang Cristina Andersson Johan Liu Zhaonian Cheng Key Laboratory of Advanced Display & System Applications (Ministry of Education) SMIT Center SHU-Intel Joint Packaging Center School of Automation and Mechanical Engineering Shanghai University China SMIT Center Bionano Systems Laboratory Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden

Soldering with lead-free tin-based solder alloys demands substantially higher processing temperatures compared to conventional tin-lead solders, resulting in both significantly greater growth rates of Intermetallic Compounds (IMCs) and dissolution of surface finish layers. In this paper, the interfacial reactions between a new lead-free solder composition, eutectic Sn-0.7Cu- 0.4Co, and Electroless Nickel/ Immersion Gold (ENIG)/Cu surface finish have been investigated as a function of reflow temperature and reflow time. Three different soldering temperatures were used, namely, 240, 250 and 260degC, while the reflow time was varied between 2, 5, 10, 30, 60 and 120 min, respectively. The microstructure of the solder joints was observed by means of Scanning Electron Microscopy (SEM) and the chemical composition of the different phases was analyzed by means of Energy Dispersive X-ray (EDX), in order to study the relationship between interface IMC formation and reflow process parameters. The results show that the IMCs in the bulk solder matrix are different from those built at the interface between the solder and the surface finish layer. In the bulk solder only CoSn 2 IMCs were found. The reaction between the molten solder and electroless Ni layer resulted in formation of a ternary (Cu, Ni) 6 Sn 5 IMC at the interface. This interfacial IMC layer was continuous, and with a faceted morphology. The thickness of the IMC layer as a function of both reflow time and temperature was also investigated. The apparent activation energy was also obtained by using one reflow process with different reflow temperatures and times.

关键词： Temperature Kinetic theory Intermetallic Soldering Surface finishing Surface morphology Nickel Environmentally friendly manufacturing techniques Lead Scanning electron microscopy

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Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

Effects of the pectus excavatum on the spine in patients of ...

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第十一届全国生物力学学术会议暨第十三届全国生物流变学学术会议

作者： Weihong Zhong Jinduo Ye Jifu Liu Chunqiu Zhang Linwei Lü Chunyue Zhang Bolun Liu Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Military General Hospital of Beijing PLA

Objective:Pectus excavatum(PE)is the most frequently observed congenital deformity of the chest with a deep depression of the sternum in the anterior thoracic *** more than 20%of pectus excavatum patients were reported to have *** to now,no comprehensive analysis about the impact that pectus excavatum has on scoliosis has been performed,although previous research has involved correlation among scoli-

关键词： Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

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Detection of N-Propanol Down to Sub-Ppm Level Using P-Type Delafossite AgCrO2 Nanoparticles

SSRN

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SSRN 2022年

作者： Li, Wentao Kong, Lingwei Li, Xifeng Zhu, Wenhuan Zhang, Jianhua Liu, Hai Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Road Shanghai200072 China Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

As an important biomarker of lung cancer, n-propanol at sub-ppm level is still challenging to be detected for a simple and immediate early diagnose. In this work, a new n-propanol gas sensor with an ultralow detection limit down to 100 ppb is presented using AgCrO2 nanoparticles synthesized by a simple hydrothermal method. Compared with the congeneric CuCrO2 and commercial SnO2 , AgCrO2 exhibits prevailing performances, including a higher selectivity, dynamic response, logarithmical linearity, but lower working temperature. The first principles calculation and the energy band theoretical analysis are combined to elucidate the sensing mechanism, in which the chemical adsorption of gaseous molecules to the silver followed by the dehydrogenation on chromium on the surface of AgCrO2 is responsible to the outstanding susceptibility towards n-propanol. The proposed metal oxide semiconductor gas sensor capable of sub-ppm n-propanol detection provides a route to design and optimize the sensitive material system for the advanced trace detection of the volatile organic compounds. © 2022, The Authors. All rights reserved.

关键词： Volatile organic compounds

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Management of Exciton Recombination Zone and Energy Loss for 4cztpn-Based Organic Light-Emitting Diodes Via Engineering Hosts

SSRN

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SSRN 2022年

作者： Tang, Zongkai Lü, Zhaoyue Zheng, Yanqiong Wang, Junling School of Physics East China University of Science & Technology Shanghai200237 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai200072 China Basic Department Army Academy of Armored Forces Beijing100072 China

The exciton recombination zone and energy loss of organic light-emitting diodes (OLEDs) with thermally activated delayed fluorescence (TADF) emitter 4CzTPN (1, 2, 4, 5-Tetrakis(carbazol-9-yl)-3, 6-dicyanobenzene) as the dopant are explored by engineering hosts. The results demonstrate that the exciton recombination zone is determined by the matching condition between hole and electron mobility of hosts. The shift of the recombination zone from cathode to anode side induces a blue-shift of the electroluminescent spectra. And energy loss can be reduced by well-matched carrier mobility and TADF feature of host as well as lower energy level offset between host and guest. Specifically, the exciplex-co-hosted device delivers the maximum current/power efficiency/external quantum efficiency of 29.06 cd·A–1/28.89 lm·W–1/8.86%, respectively, enhanced by more than 50% than the single-component-hosted devices. This study illuminates that controlling exciton recombination zone and energy loss via engineering hosts is a feasible strategy for developing high performance TADF OLEDs. © 2022, The Authors. All rights reserved.

关键词： Energy dissipation

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Instability Mechanism of Phosphomolybdic Acid Solution and its Effect on Organic Solar Cells as a Hole-Transporting Layer

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SSRN 2023年

作者： Chen, Guo Qu, Minghao Li, Yaozhao Li, Peng Yang, Xuyong Wei, Bin School of Materials Science and Engineering Shanghai University Shanghai200072 China School of Medicine Shanghai University Shanghai200444 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Yanchang Road 149 Shanghai200072 China

Phosphomolybdic acid (H3PMo12O40, PMA) containing twelve MoO3 units exhibits an efficient hole-transporting property in organic electronics. Low-cost, easy synthesis and high thermal-stability PMA is promising solution-processed hole-transporting material for high efficiency organic solar cells (OSCs). We have studied the degradation mechanism of phosphomolybdic acid in methanol solution that was stored for days, and further investigated its effect on the performance of OSC devices. We found that PMA had been slowly reduced to phosphomolybdic heteropoly blue during the solution storage process. Besides the morphology of the PMA film, its energy level and molybdenum valence which changed with solution storage time were also investigated. The instability of PMA in methanol solution resulted in a significant negative effect on the device performance. Comparing to the PM6:Y6 device based on PMA from pristine solution, the power conversion efficiencies of OSCs with PMA hole transporting layer prepared from solution stored for 8 days and 16 days decreased from 14.69% to 3.01% and 0.58%, respectively. Fortunately, using other stable processing solvent systems instead of methanol for the fabrication of the PMA hole transporting layer has been found as an efficient method to avoid the degration of the device performance. © 2023, The Authors. All rights reserved.

关键词： Stability

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Development of a test platform for thermal characterization using through-silicon-via technology

Development of a test platform for thermal characterization ...

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IMAPS Nordic Annual Conference 2009

作者： Fu, Yifeng Wang, Teng Liu, Johan Department of Microtechnology and Nanoscience SMIT Center and Bionano Systems Laboratory Chalmers University of Technology SE-412 96 Göteborg Sweden SHT Smart High Tech AB Nordgårdsvägen 19 428 34 Kållered Sweden FOAB Elektronik AB St Jörgens väg 8 422 49 Hisingsbacka Sweden Key Laboratory of Advanced Display and System Applications and SMIT Center Yan Chang Campus Shanghai University No. 149 Yan Chang Road Shanghai 200072 China

ISBN: (纸本)9781622761838

In order to look into the heat transfer mechanism and improve the thermal performance of an electronic component, a thermal test platform has been designed and fabricated. A series of micro-machining processes have been developed to make the test platform. The Through-Silicon-Via technique using Cu as a conductor has been used to fabricate the temperature sensors in order to realize an in-situ temperature monitoring on a thermal interface. Pt-based temperature sensor array has been deposited on the chip and calibrated by an industry standard RTD. Results show that the Pt sensors work well which demonstrates the successful deposition of temperature sensing materials and good interconnection between through-hole vias and IC components. This indicates that the test platform can be used for thermal interface material characterization as well as 3D electronics reliability studies. Copyright © (2009) by International Microelectronics and Packaging Society, Europe.

关键词： Three dimensional integrated circuits

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A Motion Attention Model Based Rate Control Algorithm for H.264/AVC

A Motion Attention Model Based Rate Control Algorithm for H....

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International Conference on Computer and Information Science (ACIS)

作者： Zhi Liu Hongbo Yan Liquan Shen Yongfang Wang Zhaoyang Zhang School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application Shanghai University Ministry of Education of China Shanghai China

Rate control plays a very important role in video streaming applications. The currently adopted rate control scheme in the latest video coding standard H.264/AVC still results in a relatively large quality fluctuation especially for frames with higher motion activities. In this paper, we consider the characteristics of human visual system and incorporate a motion attention model to direct the rate control process. From the motion vector (MV) field at 4times4 block level, motion saliency maps are calculated on multi-scale MV fields and integrated to a whole motion saliency map highlighting the attention regions. In the frame and MB layer of rate control, the number of bits allocated to each frame and each MB is adjusted based on its motion saliency. More bits are allocated those frames and MBs with higher motion saliency to improve their qualities, and thus reduce the quality variation. Experimental results demonstrate that our algorithm can increase the average PSNR by 0.068 dB, and decreases the PSNR variation by 15.65%, with a negligible increase of computation less than 3%.

关键词： Motion control Automatic voltage control Humans Streaming media Video coding Video sequences Communication system control Visual system Fluctuations PSNR

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Thermodynamic simulation of 6×6 Micro-LED array in flip-chip bonding

Thermodynamic simulation of 6×6 Micro-LED array in flip-chi...

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

作者： Haojie Zhou Xiaoxiao Ji Luqiao Yin Jianhua Zhang School of Materials Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronics and Automation Shanghai University Shanghai China School of Microelectronics Shanghai University Shanghai China

In this paper, we first simulated the influence of different diameters, heights and shapes on the In bumps by ANSYS simulation software. The results show that the changes of these conditions affect the deformation and stress of the In bumps to varying degrees. The height of the bumps has the least effect on the stress, while the diameter and shape of the bumps have a great effect on the deformation as well as stress. Finally, a sapphire based Mirco-LED array with a pixel pitch size of 7.5 μm was used to bond with silicon substrates with In bumps of different heights, and turn it on with electricity. We found that the In bumps height does affect the yield of Micro-LED, and the best yield in the experiment is > 90%. This study provides a theoretical basis for reducing the deformation and stress of In bumps during flip-chip bonding, and an experimental basis for improving bond yield and device performance.

关键词： Thermodynamics Deformation Shape Simulation Software Silicon Flip-chip devices

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