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On the voltage behavior of quantum dot light-emitting diode

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Nano Research 2023年第4期16卷 5511-5516页

The origin of the efficiency drop of quantum dot light-emitting diode(QLED)under consecutive voltage sweeps is still a puzzle.In this work,we report the voltage sweep behavior of QLED.We observed the efficiency drop of red QLED with ZnMgO electron transport layer(ETL)under consecutive voltage sweeps.In contrast,the efficiency increases for ZnO ETL device.By analyzing the electrical characteristics of both devices and surface traps of ZnMgO and ZnO nanoparticles,we found the efficiency drop of ZnMgO device is related to the hole leakage mediated by trap state on ZnMgO nanoparticles.For ZnO device,the efficiency raise is due to suppressed electron leakage.The hole leakage also causes rapid lifetime degradation of ZnMgO device.However,the efficiency and lifetime degradation of ZnMgO device can be eliminated with shelf aging.Our work reveals the distinct voltage sweep behavior of QLED based on different ETLs and may help to understand the lifetime degradation mechanism in QLED.

关键词： quantum dot light-emitting diode voltage sweep behavior efficiency drop hole leakage current

Impedance spectroscopy for quantum dot light-emitting diodes

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半导体学报:英文版 2023年第9期44卷 26-38页

作者： xiangwei qu Xiaowei Sun Institute of Nanoscience and Applications and Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of Educationand Shenzhen Key Laboratory for Advanced Quantum Dot Displays and LightingSouthern University of Science and TechnologyShenzhen 518055China

Impedance spectroscopy has been increasingly employed in quantum dot light-emitting diodes(QLEDs)to investigate the charge dynamics and device physics.In this review,we introduce the mathematical basics of impedance spectroscopy that applied to QLEDs.In particular,we focus on the Nyquist plot,Mott-Schottky analysis,capacitance-frequency and capacitance-voltage characteristics,and the d C/d V measurement of the QLEDs.These impedance measurements can provide critical information on electrical parameters such as equivalent circuit models,characteristic time constants,charge injection and recombination points,and trap distribution of the QLEDs.However,this paper will also discuss the disadvantages and limitations of these measurements.Fundamentally,this review provides a deeper understanding of the device physics of QLEDs through the application of impedance spectroscopy,offering valuable insights into the analysis of performance loss and degradation mechanisms of QLEDs.

关键词： quantum dot light-emitting diode impedance spectroscopy equivalent circuit model charge dynamics

Emergence of highly pathogenic avian influenza A(H5N8)clade 2.3.4.4b viruses in grebes in Inner Mongolia and Ningxia,China,in 2021

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Journal of Integrative Agriculture 2024年第1期23卷 348-353页

作者： Qiuzi Xu Xinru Lü Yi Li Hua Luo Zhen Zhang Xiang Li Rongxiu Qin Qing An Fengyi qu Zhenliang Zhao Chengbo Zhang Weidong Wang Yuecheng Li Yajun Wang xiangwei Zeng Zhijun Hou Jingqiang Ren Yulong Wang Yanbing Li Hongliang Chai College of Wildlife and Protected Area Northeast Forestry UniversityHarbin 150040China Harbin Veterinary Research Institute Chinese Academy of Agricultural SciencesHarbin 150040China Wenzhou Key Laboratory for Virology and Immunology Institute of VirologyWenzhou UniversityWenzhou 325000China Ordos Forestry and Grassland Administration Ordos 017000China Monitoring Center for Terrestrial Wildlife Epidemic Diseases Yinchuan 750000China

Highly pathogenic avian influenza(HPAI)subtype H5Nx viruses have spread globally and are a major concern for poultry,wild birds,mammals,and even humans(de Vries et al.2015;Zeng et al.2022).The hemagglutinin(HA)genes of H5 subtype viruses have evolved into multiple clades and some of these clades have been further divided into subclades(Cui et al.2022).Clade 2.***.4.4H5N8 HPAI viruses(HPAIVs)have caused several waves of disease outbreaks in wild birds and domestic poultry(Wang et al.2022).

关键词： poultry Ningxia influenza

Highly efficient transparent quantum-dot light-emitting diodes based on inorganic double electron-transport layers

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Photonics Research 2021年第10期9卷 1979-1983页

作者： Nan Zhang xiangwei qu quan Lyu Kai Wang Xiao Wei Sun Peng Cheng Laboratory Shenzhen 518055China Guangdong University Key Laboratory for Advanced quantum Dot Displays and Lighting Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devicesand Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China Huawei Technologies Research&Development(UK)Ltd. Ipswich IP53REUK

Herein,we report the fabrication of high-performance transparent quantum-dot light-emitting diodes(Tr-QLEDs)with ZnO/ZnMgO inorganic double electron-transport layers(ETLs).The ETLs effectively suppress the excess electron injection and facilitate charge balance in the Tr-QLEDs.The thick ETLs as buffer layers can also withstand the plasma-induced damage during the indium tin oxide sputtering.These factors collectively contribute to the development of Tr-QLEDs with improved performance.As a result,our Tr-QLEDs with double ETLs exhibited a high transmittance of 82%at 550 nm and a record external quantum efficiency of 11.8%,which is 1.27 times higher than that of the devices with pure ZnO ETL.These results indicate that the developed ZnO/ZnMgO inorganic double ETLs could offer promising solutions for realizing high-efficiency Tr-QLEDs for next-generation display devices.

关键词： diodes double quantum

基于功率微分项的双VSG有功功率振荡抑制策略

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电机与控制学报 2024年第1期28卷 177-188页

作者：朱军袁亚飞刘鹏辉杜少通郭向伟杨明曲玉博河南理工大学电气工程与自动化学院河南焦作454000 许继电气股份有限公司河南许昌461000

针对虚拟同步发电机(VSG)双机并联运行时产生的有功功率振荡问题,通过建立双VSG系统的小信号模型,分析了有功功率振荡产生的机理,提出一种基于改进虚拟阻抗的瞬态功率均分策略和一种基于功率微分项的自适应惯量和阻尼的功率振荡抑制策略... 详细信息

针对虚拟同步发电机(VSG)双机并联运行时产生的有功功率振荡问题,通过建立双VSG系统的小信号模型,分析了有功功率振荡产生的机理,提出一种基于改进虚拟阻抗的瞬态功率均分策略和一种基于功率微分项的自适应惯量和阻尼的功率振荡抑制策略,将有功功率微分项与角加速度结合起来实现惯量的自适应调节,同时将有功功率微分项引入阻尼控制环节以替代传统的阻尼项,实现阻尼的自适应调节。所提出的策略可以使动态时VSG之间的角频率差更快速地趋近于零,从而减小有功功率振荡的超调,改善频率动态响应性能。搭建了VSG并联的仿真模型,仿真结果表明:所提改进控制策略可以使瞬态时实现有功均分,使动态时的有功功率振荡超调减小41%,振荡过程减小了1秒。

关键词：虚拟同步发电机功率微分项自适应惯量阻尼功率振荡抑制功率均分

Enhancing performance of inverted quantum-dot light-emitting diodes based on a solution-processed hole transport layer via ligand treatment

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半导体学报:英文版 2023年第9期44卷 68-74页

作者： Depeng Li Jingrui Ma Wenbo Liu Guohong Xiang xiangwei qu Siqi Jia Mi Gu Jiahao Wei Pai Liu Kai Wang Xiaowei Sun Institute of Nanoscience and Applications and Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationGuangdong University Key Laboratory for Advanced Quantum Dot Displays and Lightingand Shenzhen Key Laboratory for Advanced Quantum Dot Displays and LightingSouthern University of Science and TechnologyShenzhen 518055China Institute of Advanced Displays and Imaging Henan Academy of SciencesZhengzhou 450046China

The performance of inverted quantum-dot light-emitting diodes(QLEDs)based on solution-processed hole transport layers(HTLs)has been limited by the solvent-induced damage to the quantum dot(QD)layer during the spin-coating of the HTL.The lack of compatibility between the HTL’s solvent and the QD layer results in an uneven surface,which negatively impacts the overall device performance.In this work,we develop a novel method to solve this problem by modifying the QD film with 1,8-diaminooctane to improve the resistance of the QD layer for the HTL’s solvent.The uniform QD layer leads the inverted red QLED device to achieve a low turn-on voltage of 1.8 V,a high maximum luminance of 105500 cd/m2,and a remarkable maximum external quantum efficiency of 13.34%.This approach releases the considerable potential of HTL materials selection and offers a promising avenue for the development of high-performance inverted QLEDs.

关键词： quantum dots quantum-dot light-emitting diodes inverted structure ligand treatment

8.8级非调紧固件用10B21盘条研究与开发

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特殊钢 2024年第1期45卷 23-26页

作者：孔祥伟白云张剑锋江阴兴澄特种钢铁有限公司特钢研究院江阴214400

采用转炉→精炼炉→真空脱气→方坯连铸→加热→粗轧→中轧→精轧→减定径→吐丝→XDWP(Xingcheng Direct Water Patenting)冷却→斯太尔摩风冷冷却的方式试验生产基于10B21钢的8.8级非调紧固件用热轧盘条。通过控制减定径温度为813℃,... 详细信息

采用转炉→精炼炉→真空脱气→方坯连铸→加热→粗轧→中轧→精轧→减定径→吐丝→XDWP(Xingcheng Direct Water Patenting)冷却→斯太尔摩风冷冷却的方式试验生产基于10B21钢的8.8级非调紧固件用热轧盘条。通过控制减定径温度为813℃,吐丝温度为828℃,斯太尔摩辊道速率设置为0.75 m/s,在连续经过XDWP冷却和斯太尔摩风冷后获得的热轧盘条抗拉强度达到680 MPa,断后伸长率为23.6%,断面收缩率为75%,力学性能完全满足GB/T 29087―2012的要求。且经过1/4冷顶锻和25%的大减面率拉拔试验,其结果满足紧固件用户使用要求。

关键词： 8.8级非调紧固件 10B21钢 XDWP 贝氏体

Efficiency enhancement of Polymer solar cells by adding Bilayer Alq3/CaF2 Cathode Buffer Layers

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Efficiency enhancement of Polymer solar cells by adding Bila...

Hepatocellular Carcinoma Surveillance and Treatment:A Way to Reduce Cancer-related Mortality in Cirrhotic Patients

第四届新型太阳能电池学术研讨会

作者： Xu Xu xiangwei qu Panpan Zhang Bonan Kang State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University

In the polymer solar cells(PSCs), the photocurrent lies not only on the optical characteristics of organic active layer materials and the ability of electrode to extraction/collection the charge, but also on the properties of the organic active layer/electrode interface.Buffer layer can play a good role in the modification between active layer and electrode.Therefore, we introduce of bilayer Alq/CaF cathode buffer layers for PCDTBT and PCBM-based PSCs.We investigate the properties of devices with CaF cathode buffer layer and Alq/CaF cathode bilayer buffer layer which were inserted between the active layer and cathode, and it is found that the power conversion efficiencies of devices with Alq/CaF bilayer structure exhibits a V of 0.90 V, a J of 12.77mA/cm, a FF of 65.50% and a best PCE of 7.48%.Alq is an organic small molecule material as an electron extraction layer.CaF can form a better interface contact by reducing series resistance(Rs) of PSCs.The enhancement of PCE is attributed to Alq/CaF cathode buffer layer improve the generation of photocurrent and interfacial contact for efficient charge transfer.

关键词： polymer solar cells bilayer cathode buffer layer CaF2 charge transport interfacial engineering power conversion efficiency

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Journal of Clinical and Translational Hepatology 2019年第1期7卷 1-2页

作者： Xiangjun Qian Xiaotong Yan xiangwei Zhai Ni Li Chunfeng qu Fengmin Lu Department of Microbiology&Infectious Disease Center School of Basic Medical SciencesPeking University Health Science CenterBeijingChina Department of Epidemiology and Biostatistics College of Public HealthZhengzhou UniversityZhengzhouChina Office for Cancer Screening National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina State Key Lab of Molecular Oncology&Immunology Department National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

In the issue of Gastroenterology published October 2018,the article by Moon et al.1 demonstrated that screening patients with cirrhosis for hepatocellular carcinoma(HCC)by ultrasound scan(USS),measurement of serumα-fetoprotein(AFP),each alone or in combination,was not associated with the decreased HCC-related mortality.In this matched case control study,all the study patients were registered in detail in the U.S.Department of Veterans Affairs.The study included 238 cases who died of HCC with cirrhosis,and the same number of matched controls with cirrhosis who had been enrolled in U.S.Department of Veterans Affairs care for the 4 years before the index date and alive at the time of their matched case's death.The study retrospectively collected each case's USS and AFP screening data for 4 years before the date of HCC diagnosis or the equivalent index date in controls.Authors found that there was no significant difference of frequency of routine screening between the cases and controls.Therefore,the authors interpreted these results as indicating that the routine screening would not reduce cancer-related mortality.

关键词： routine Carcinoma mortality