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240 nm AlGaN-based deep ultraviolet micro-LEDs:size effect versus edge effect

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Journal of Semiconductors 2024年第1期45卷 55-62页

作者： Shunpeng Lu Jiangxiao Bai Hongbo Li Ke Jiang Jianwei Ben shanli zhang Zi-Hui zhang Xiaojuan Sun Dabing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Electronic Materials and Devices of Tianjin School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China

240 nm AlGaN-based micro-LEDs with different sizes are designed and ***,the external quantum efficiency(EQE)and light extraction efficiency(LEE)are systematically investigated by comparing size and edge ***,it is revealed that the peak optical output power increases by 81.83%with the size shrinking from 50.0 to 25.0μ***,the LEE increases by 26.21%and the LEE enhancement mainly comes from the sidewall light *** notably,transversemagnetic(TM)mode light intensifies faster as the size shrinks due to the tilted mesa side-wall and Al reflector ***,when it turns to 12.5μm sized micro-LEDs,the output power is lower than 25.0μm sized *** underlying mechanism is that even though protected by SiO2 passivation,the edge effect which leads to current leakage and Shockley-Read-Hall(SRH)recombination deteriorates rapidly with the size further ***,the ratio of the p-contact area to mesa area is much lower,which deteriorates the p-type current spreading at the mesa *** findings show a role of thumb for the design of high efficiency micro-LEDs with wavelength below 250 nm,which will pave the way for wide applications of deep ultraviolet(DUV)micro-LEDs.

关键词： AlGaN deep ultraviolet micro-LEDs light extraction efficiency size effect edge effect

AlGaN基深紫外LED光源灭活柯萨奇病毒研究

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发光学报 2024年第8期45卷 1391-1397页

作者：吴郁蓝习瑜张梓睿吴章鑫刘忠宇杨玲佳张山丽徐可贲建伟北京大学第三医院北京100191 武汉大学生命科学学院湖北武汉430072 中国科学院长春光学精密机械与物理研究所吉林长春130033

为探究在高温热处理AlN模板上制备的不同发光波长AlGaN基LED器件对病毒的灭活效率,本工作在发光波长257~294 nm范围内制备了7组不同发光波长AlGaN基深紫外LED器件,并探究其对柯萨奇病毒灭活效率。实验结果表明,高温热处理AlN模板可以将... 详细信息

为探究在高温热处理AlN模板上制备的不同发光波长AlGaN基LED器件对病毒的灭活效率,本工作在发光波长257~294 nm范围内制备了7组不同发光波长AlGaN基深紫外LED器件,并探究其对柯萨奇病毒灭活效率。实验结果表明,高温热处理AlN模板可以将AlN模板位错密度降低至1.33×10^(7)cm^(-2),为制备高效率AlGaN基LED器件奠定了良好基础;基于高温热处理AlN模板制备的AlGaN基LED器件,在灭活距离2 cm、紫外辐照时间30 s实验条件下,发光中心波长在257~278 nm之间的AlGaN基LED器件对柯萨奇病毒灭活率≥99.90%,而发光中心波长为288 nm、294 nm的LED对柯萨奇病毒灭活率仅为99.47%及96.15%。根据以上研究结果,波长在257~278 nm之间的AlGaN基LED器件适合在病毒消杀领域应用;在本工作实验条件下,波长大于288 nm的AlGaN基深紫外LED器件对病毒灭活效果较差。

关键词：高温热处理 AlN模板 AlGaN LED 病毒灭活

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Prediction of network public opinion based on bald eagle algorithm optimized radial basis function neural network

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International Journal of Intelligent Computing and Cybernetics 2022年第2期15卷 184-200页

作者： Jialiang Xie shanli zhang Ling Lin College of Science Jimei UniversityXiamenChina

Purpose-In the new era of highly developed Internet information,the prediction of the development trend of network public opinion has a very important reference significance for monitoring and control of public opinion by relevant government ***/methodology/approach-Aiming at the complex and nonlinear characteristics of the network public opinion,considering the accuracy and stability of the applicable model,a network public opinion prediction model based on the bald eagle algorithm optimized radial basis function neural network(BES-RBF)is *** research is conducted with Baidu indexes such as“COVID-19”,“Winter Olympic Games”,“The 100th Anniversary of the Founding of the Party”and“Aerospace”as samples of network public ***-The experimental results show that the model proposed in this paper can better describe the development trend of different network public opinion information,has good stability in predictive performance and can provide a good decision-making reference for government public opinion control ***/value-A method for optimizing the central value,weight,width and other parameters of the radial basis function neural network with the bald eagle algorithm is given,and it is applied to network public opinion trend *** example verifies that the prediction algorithm has higher accuracy and better stability.

关键词： Network public opinion COVID-19 Bald eagle algorithm RBF neural network

Rapid inactivation of human respiratory RNA viruses by deep ultraviolet irradiation from light-emitting diodes on a high-temperatureannealed AlN/Sapphire template

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Opto-Electronic Advances 2023年第9期6卷 31-43页

作者： Ke Jiang Simeng Liang Xiaojuan Sun Jianwei Ben Liang Qu shanli zhang Yang Chen Yucheng Zheng Ke Lan Dabing Li Ke Xu State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhan 430072China Institute for Vaccine Research Animal Biosafety Level 3 LaboratoryWuhan UniversityWuhan 430072China

Efficient and eco-friendly disinfection of air-borne human respiratory RNA viruses is pursued in both public environment and portable *** AlGaN-based deep ultraviolet(DUV)light-emission diode(LED)has high practical potentials because of its advantages of variable wavelength,rapid sterilization,environmental protection,and ***,whether the emission wavelength has effects on the disinfection as well as whether the device is feasible to sterilize various respiratory RNA viruses under portable conditions is ***,we fabricate AlGaN-based DUV LEDs with different wavelength on high-temperature-annealed(HTA)AlN/Sapphire templates and investigate the inactivation effects for several respiratory RNA *** AlN/AlGaN superlattices are employed between the template and upper n-AlGaN to release the strong compressive stress(SCS),improving the crystal quality and interface *** LEDs with the wavelength of 256,265,and 278 nm,corresponding to the light output power of 6.8,9.6,and 12.5 mW,are realized,among which the 256 nm-LED shows the most potent inactivation effect in human respiratory RNA viruses,including SARS-CoV-2,influenza A virus(IAV),and human parainfluenza virus(HPIV),at a similar light power density(LPD)of~0.8 mW/cm2 for 10 *** results will contribute to the advanced DUV LED application of disinfecting viruses with high potency and broad spectrum in a portable and eco-friendly use.

关键词： AlGaN DUV LED superlattice SARS-CoV-2 influenza A virus

Construction of van der Waals substrates for largely mismatched heteroepitaxy systems using first principles

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 89-95页

作者： ZhiMing Shi XiaoJuan Sun YuPing Jia XinKe Liu shanli zhang ZhanBin Qi DaBing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The high density of defects induced by large strains in largely mismatched heteroepitaxy systems, such as AlN and GaN, because of the large lattice and thermal mismatch between substrates and epilayers is the bottleneck problem. Graphene-assisted van der Waals(vdW) heteroepitaxy offers a new opportunity to resolve this problem. However, it suffers from the difficulty of nucleation. Here we theoretically assess the effects of five 2D materials for vdW heteroepitaxy of AlN and GaN, including graphene, hBN, MoS2, gC3N, and gC3N4, and provide physical insights using first-principle calculations. MoS2 and gC3N exhibit significant potential to overcome the shortcomings of graphene owing to their appropriate binding strengths and Al(or Ga)diffusion barriers. Moreover, the interface behavior between the epilayers and the substrates are carefully analyzed. Our findings are helpful not only for obtaining high-quality AlN and GaN films but also for developing new criterions to discover effective 2D materials for vdW heteroepitaxy.

关键词： van der Waals epitaxy 2D materials first principles

Polarization-enhanced AlGaN solar-blind ultraviolet detectors

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Photonics Research 2020年第7期8卷 1243-1252页

作者： Ke Jiang Xiaojuan Sun Zi-Hui zhang Jianwei Ben Jiamang Che Zhiming Shi Yuping Jia Yang Chen shanli zhang Wei Lv Dabing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Electronic Materials and Devices of Tianjin School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun 130012China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China

AlGaN solar-blind ultraviolet detectors have great potential in many fields,although their performance has not fully meet the requirements until ***,we proposed an approach to utilize the inherent polarization effect of AlGaN to improve the detector *** heterostructures were designed to enhance the polarization field in the absorption layer,and a high built-in field and a high electron mobility conduction channel were *** a result,a high-performance solar-blind ultraviolet detector with a peak responsivity of 1.42 A/W at 10 V was achieved,being 50 times higher than that of the nonpolarization-enhanced ***,an electron reservoir structure was proposed to further improve the performance.A higher peak responsivity of 3.1 A/W at30 V was achieved because the electron reservoir structure could modulate the electron concentration in the conduction *** investigation presented here provided feasible approaches to improve the performance of the AlGaN detector by taking advantage of its inherent property.

关键词： polarization AlGaN ultraviolet

基于开放银行的征信创新模式——英国替代信用评分公司信用荣耀(Credit Kudos)研究

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征信 2022年第12期40卷 64-67,84页

作者：刘新海张山立全联并购公会信用管理委员会北京100026 北京信用学会北京100089 首都师范大学北京100048

征信替代数据是目前全球征信行业发展的热点问题,有利于征信机构和金融科技公司增加个人信用评估有效覆盖度。开放银行机制释放的个人账户流水数据被认为是一种更有价值的替代数据。英国创新征信公司信用荣耀(Credit Kudos)的新模式利... 详细信息

征信替代数据是目前全球征信行业发展的热点问题,有利于征信机构和金融科技公司增加个人信用评估有效覆盖度。开放银行机制释放的个人账户流水数据被认为是一种更有价值的替代数据。英国创新征信公司信用荣耀(Credit Kudos)的新模式利用开发银行提供的数据进行个人信用评估,获得众多科技公司的青睐。信用荣耀公司的商业模式和数据隐私处理方式也对我国征信建设带来了新的启示。

关键词：替代数据开放银行信用个人信用评分 BigTech BNPL

个人征信行业的创新方向——韩国MyData行业与征信应用

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征信 2023年第6期41卷 65-71页

作者：刘新海安光勇张山立全联并购公会信用管理委员会北京100026 北京信用学会北京100089 首都师范大学北京100048

个人征信体系作为消费经济的基础设施,在数字经济时代的地位越来越重要。传统个人征信模式面临新的数字经济形态、科技创新、个人数据严监管以及普惠金融的冲击,需要与时俱进。在韩国,“本人数据管理”(MyData)模式的创新尝试给个人征... 详细信息

个人征信体系作为消费经济的基础设施,在数字经济时代的地位越来越重要。传统个人征信模式面临新的数字经济形态、科技创新、个人数据严监管以及普惠金融的冲击,需要与时俱进。在韩国,“本人数据管理”(MyData)模式的创新尝试给个人征信带来了创新方向,有助于解决国内征信数据断直连监管。根据MyData模式的基本理念、发展路径和实践案例,从征信行业发展、数据合规和征信业务推进等方面总结启示。

关键词：个人征信替代数据本人数据管理(MyData) 征信断直连

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考虑主体失望情绪的分布语言自信群决策方法

重庆工商大学学报（自然科学版） 2023年第3期40卷 85-96页

作者：张善丽张世涛刘小弟安徽工业大学数理科学与工程学院安徽马鞍山243032

针对分布语言自信评价信息下的多属性群决策问题,提出了一种考虑主体失望情绪的行为多属性群决策方法。首先,考虑实际群决策过程因为决策者的背景、经验、知识等原因会对自身给出的分布语言评价信息有着不同水平的自信程度(这反映了分... 详细信息

针对分布语言自信评价信息下的多属性群决策问题,提出了一种考虑主体失望情绪的行为多属性群决策方法。首先,考虑实际群决策过程因为决策者的背景、经验、知识等原因会对自身给出的分布语言评价信息有着不同水平的自信程度(这反映了分布语言评价信息的可靠性),定义了一种新的评价结构,即分布语言自信评价;其次,在分布语言自信评价下,考虑有限理性的决策主体,其失望情绪常隐含于决策判断或评价中,利用失望理论,将主体失望情绪融入决策过程,同时,获得分布语言自信评价下的主体感知效用,将主体分布语言自信决策矩阵转化为主体自信效用决策矩阵;然后,定义自信效用向量Dice相似测度和加权Dice相似测度,结合属性的不兼容性程度构建优化模型确定属性权重;接着,基于TOPSIS思想对备选方案进行择优排序;最后,在循环经济背景下评估生态工业园区的决策算例,说明该方法的可行性与有效性。

关键词：分布语言自信评价失望理论 Dice相似度优化模型生态工业园评估