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Direct demonstration of carrier distribution and recombination within step-bunched UV-LEDs

Photonics Research 2021年第5期9卷 764-771页

作者： HOUQIANG XU jiean jiang LI CHEN JASON HOO LONG YAN SHIPING GUO CAI SHEN YANPING WEI HUA SHAO ZI-HUI ZHANG WEI GUO JICHUN YE Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Advanced Micro-Fabrication Equipment Inc. Shanghai 201201China Institute of Micro-Nano Photoelectron and Electromagnetic Technology Innovation School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China

AlGaN-based solid state UV emitters have many advantages over conventional UV sources. However, UV-LEDs still suffer from numerous challenges, including low quantum efficiency compared to their blue LED counterparts. One of the inherent reasons is a lack of carrier localization effect inside fully miscible AlGaN alloys. In the pursuit of phase separation and carrier localization inside the active region of AlGaN UV-LED, utilization of highly misoriented substrates proves to be useful, yet the carrier distribution and recombination mechanism in such structures has seldom been reported. In this paper, a UV-LED with step-bunched surface morphology was designed and fabricated, and the internal mechanism of high internal quantum efficiency was studied in detail. The correlation between microscale current distribution and surface morphology was provided, directly demonstrating that current prefers to flow through the step edges of the epitaxial layers. Experimental results were further supported by numerical simulation. It was found that efficient radiative recombination centers were formed in the inclined quantum well regions. A schematic three-dimensional energy band structure of the multiple quantum wells(MQWs) across the step was proposed and helps in further understanding the luminescence behavior of LEDs grown on misoriented substrates. Finally, a general principle to achieve carrier localization was proposed, which is valid for most ternary Ⅲ-Ⅴ semiconductors exhibiting phase separation.

关键词： distribution mechanism quantum

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Advanced synaptic devices and their applications in biomimetic sensory neural system

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Chip 2023年第1期2卷 1-22页

作者： Yiqi Sun jiean Li Sheng Li Yongchang jiang Enze Wan Jiahan Zhang Yi Shi Lijia Pan School of Electronic Science and Engineering Nanjing University210093NanjingChina School of Microelectronics and Control Engineering Changzhou University213164ChangzhouChina School of Computer Sci-ence and Engineering Macao University of Science and Technology

Human nervous system,which is composed of neuron and synapse networks,is capable of processing information in a plastic,dataparallel,fault-tolerant,and energy-efficient *** by the ingenious working mechanism of this miraculous biological data processing system,scientists have been devoting great efforts to ar-tificial neural systems based on synaptic devices in recent *** continuous development of bioinspired sensors and synaptic devices in recent years have made it possible that artificial sensory neural systems are capable of capturing and processing stimuli informa-tion in real *** progress of biomimetic sensory neural systems could provide new methods for next-generation humanoid robotics,human-machine interfaces,and other frontier ***,this review summarized the recent progress of synaptic devices and biomimetic sensory neural ***,the opportunities and remaining challenges in the further development of biomimetic sensory neural systems were also outlined.

关键词： Artificial synapse Biomimetic sensory neural system Memristor Synaptic transistor

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Multi‐vital on‐skin optoelectronic biosensor for assessing regional tissue hemodynamics

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SmartMat 2023年第3期4卷 84-95页

作者： Ming Xin Tong Yu Yongchang jiang Ruowen Tao jiean Li Feng Ran Tangsong Zhu Jinrong Huang Jing Zhang Jia‐Han Zhang Nan Hu Wei Wang Qiuhong Zhang Zhao Liu Xinran Wang Yi Shi Lijia Pan Collaborative Innovation Center of Advanced Microstructures Jiangsu Provincial Key Laboratory of Photonic and Electronic MaterialsSchool of Electronic Science and EngineeringNanjing UniversityNanjingChina Department of Vascular Surgery Nanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjingChina Department of Polymer Science and Engineering School of Chemistry and Chemical EngineeringNanjing UniversityNanjingChina

Evaluation of the oxygen‐mediated effects of clinical and daily activities demands an on‐skin device that can track multi‐vital regional tissue hemodynamics *** example,peripheral arterial disease(PAD)is the third most prevalent cardiovascular disease,but the means of diagnosing and monitoring this disease are limited because the affected area is usually in the non‐pulsatile area away from the ***,we report on an ultrathin and ultralight multi‐vital near‐infrared optoelectronic biosensor for the diagnosis and rehabilitation monitoring of regional tissue hemodynamics,which is suitable for mounting on the skin for long‐term *** device can simultaneously detect tissue oxygen saturation,heart rate,arterial blood oxygen,and tissue perfusion and shows potential for various hypoxia monitoring ***,the tissue hemodynamics detected by this device showed a highly accordance with the ankle‐brachial index and CT angiography obtained by traditional clinical ***,our design was able to accurately diagnose and effectively evaluate PAD patients before and after *** on‐skin optoelectronic biosensor shows potential in biological oxygen‐mediated behavior evaluation,injury‐state monitoring,PAD clinical diagnosis optimization,and after surgery care.

关键词： biosensor cardiovascular disease flexible electronics skin inspired electronics

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采摘期及贮藏期库尔勒香梨冲击损伤规律研究

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塔里木大学学报 2023年第1期35卷 99-104页

作者：蒋鑫曾勇刘扬张瑞张权威廖结安塔里木大学机械电气化工程学院新疆阿拉尔843300 新疆维吾尔自治区教育厅普通高等学校现代农业工程重点实验室新疆阿拉尔843300

为明晰库尔勒香梨冲击损伤变化规律,减少香梨机械损伤,本研究利用自制水果跌落损伤试验台进行冲击损伤试验,研究采摘期和贮藏期内香梨硬度变化规律,得到采摘期和贮藏期香梨冲击高度与损伤体积之间的关系,确定不同包装材料对香梨冲击损... 详细信息

为明晰库尔勒香梨冲击损伤变化规律,减少香梨机械损伤,本研究利用自制水果跌落损伤试验台进行冲击损伤试验,研究采摘期和贮藏期内香梨硬度变化规律,得到采摘期和贮藏期香梨冲击高度与损伤体积之间的关系,确定不同包装材料对香梨冲击损伤的缓冲性能。结果表明:采摘期和贮藏期内香梨硬度均表现为前阶段下降速度快,后阶段下降速度趋于平缓;随着冲击高度增加,香梨损伤体积不断增大,冲击高度与损伤体积呈现二次函数关系;包装材料对香梨冲击损伤的缓冲性能表现为钢板<胶合板<瓦楞纸板

关键词：库尔勒香梨采摘期贮藏期损伤体积

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内镜黏膜下剥离术诊治消化道病变的临床研究

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微创医学 2014年第1期9卷 18-21页

作者：覃山羽姜海行陶霖苏思彪唐国都黄杰安李晓敏柳娟刘敏芝广西医科大学第一附属医院消化内科南宁市530021

目的探讨内镜黏膜下剥离术(ESD)诊治消化道黏膜及黏膜下病变的疗效和安全性。方法应用内镜黏膜下剥离术诊治消化道病变68例,对病例的大块切除率、病理符合率、并发症发生率、复发率等进行评估。结果 68例患者切除病灶共69处,40处(58.0%... 详细信息

目的探讨内镜黏膜下剥离术(ESD)诊治消化道黏膜及黏膜下病变的疗效和安全性。方法应用内镜黏膜下剥离术诊治消化道病变68例,对病例的大块切除率、病理符合率、并发症发生率、复发率等进行评估。结果 68例患者切除病灶共69处,40处(58.0%)完整大块切除,64处(92.8%)在内镜下完全切除。23例术前曾行病理活检,13例(56.5%)术前病理与术后病理吻合,10例(43.5%)切除后大体标本送检明确病变性质。发生术后出血3例(4.4%);术中穿孔1例(1.5%),立即钛夹封闭后接受外科手术治疗。平均随访5.7个月,随访率34.8%(23/66),1例直肠腺瘤在随访的第14个月复发。结论 ESD是治疗消化道病变的一项有效的内镜微创技术,可完整大块切除较大的病灶,提高病变确诊率,而术后钛夹夹闭创面未能明显降低术后出血的发生率。

关键词：内镜黏膜下剥离术消化道黏膜病变消化道黏膜下病变

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