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Directional emissions from perovskite nanocrystals thin film enabled by metasurface integration through one step spin-coating process

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Nano Research 2023年第5期16卷 7646-7653页

作者： kexue li Xuanyu Zhang Peinan Ni Juncheng liu Fengyuan lin Xu Man Wenfeng Cai Jianxun liu Yanjun liu Rui Chen Zhipeng Wei State Key Laboratory of High Power Semiconductor Laser School of physicsChangchun University of Science and TechnologyChangchun 130022China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Photonics Laboratory Department of Microtechnology and NanoscienceChalmers University of TechnologyGöteborgSE-41296Sweden

Advances in thin film light-emitting devices have fueled the rapid growth of a new class of solid-state lighting devices,featuring low fabrication cost,high quantum efficiency,broadband spectrum coverage,*** contrast to the conventional inorganic semiconductors that rely on lattice matched high crystalline quality substrate,solution processable thin films eliminate the dependence on the substrate,which is highly desired for the ease and versatility of integrations with foreign *** taking this advantage,this work developed an ultracompact solution to control the directionality of thin film emitters using integrated dielectric metasurface through one step spin-coating *** a proof of concept,directional emissions from perovskite nanocrystal thin film,including collimated light emissions and two-dimensional beam steering,are experimentally ***,our approach,where light emitters were integrated on the back side of substrate after the fabrication of metasurface,judiciously avoids any potential degradation of material optical quality caused by the multi-step ***,it can serve as a generalized scheme to engage the advantageous properties of dielectric metasurface,including the compactness,high efficiency,beam controllability with the emerging thin film light-emitting diodes(LEDs),which is applicable to a wide range of solution processable materials,including organic light-emitting diodes,quantum-dot light emitting diodes,polymer LEDs,and perovskite LEDs,opening up new pathways to develop low-cost and ultra-compact solid state light sources with versatile beams characteristics.

关键词： solid state light source perovskite light-emitting diodes(LEDs) metasurface integrations on-chip beam shaping beam steering

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Optical characteristics of self-trapped excitons in 2D (iso-BA)_(2)PbI_(4) perovskite crystals

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Photonics Research 2022年第2期10卷 594-600页

作者： Haolin li Xuanyu Zhang Haizhen Wang Jiahao Yu kexue li Zhipeng Wei Dehui li Rui Chen State Key Laboratory of High Power Semiconductor Laser School of ScienceChangchun University of Science and TechnologyChangchun 130022China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Organic–inorganic halide metal perovskites are an exciting class of two-dimensional(2D) materials that have sparked renewed interest for next-generation optoelectronics. In particular, the self-trapped excitons(STEs)in 2D perovskite with excellent optical properties suggest great potential in display and narrowband detection.A prerequisite of understanding STEs’ properties is correct identification of the underlying interaction that leads to STEs. Here, the optical properties of STEs in(iso-BA)_(2)PbI_(4) are characterized through laser spectroscopy at various temperatures and excitation intensities. It is found that STEs are related to the octahedral distortion caused by strong electron–phonon interaction. Trapping and detrapping between STEs and free excitons(FEs) are clearly observed. With the increase in temperature, STEs and FEs will gain enough energy and migrate to each other. Moreover, by characterizing the thickness-dependent and two-photon excitation emission, it is confirmed that STEs exist inside the material because of their weak absorption. Our findings are of great significance for not only the fundamental understanding of STEs, but also the design and optimization of 2D-perovskite-based electronic and optoelectronic devices.

关键词： interaction perovskite excitation

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Highly Sensitive Photodetectors Based on WS_(2) Quantum Dots/GaAs Heterostructures

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发光学报 2024年第10期45卷 1699-1706页

作者： li Xianshuai liN Fengyuan HOU Xiaobing li kexue liAO Lei HAO Qun WEI Zhipeng State Key Laboratory of High Power Semiconductor Lasers College of PhysicsChangchun University of Science and TechnologyChangchun 130022China State Key Laboratory for Chemo/Biosensing and Chemometrics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Optoelectronics Beijing Institute of TechnologyBeijing 100081China

The performance of the photodetector is significantly impacted by the inherent surface faults in GaAs nanowires(NWs).We combined three-dimensional(3D)gallium arsenide nanowires with zero-dimensional(0D)WS_(2) quantum dot(QDs)materials in a simple and convenient way to form a heterogeneous *** performance enhancements have been realized through the formation of typeⅡenergy bands in heterostructures,opening up new research directions for the future development of photodetector *** work successfully fabricated a high-sensitivity photodetector based on WS_(2)QDs/GaAs NWs *** 660 nm laser excitation,the photodetector exhibits a responsivity of 368.07 A/W,a detectivity of 2.7×10^(12)Jones,an external quantum efficiency of 6.47×10^(2)%,a low-noise equivalent power of 2.27×10^(-17)W·Hz^(-1/2),a response time of 0.3 s,and a recovery time of 2.12 *** study provides a new solution for the preparation of high-performance GaAs detectors and promotes the development of optoelectronic devices for GaAs NWs.

关键词： GaAs nanowires WS_(2) quantum dots photodetectors type-Ⅱenergy band structure

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Sodium Diffuses from Glass Substrates through P1 lines and Passivates Defects in Perovskite Solar Modules

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Energy & Environmental Materials 2023年第6期6卷 393-401页

作者： Felix Utama Kosasih Francesco Di Giacomo Jordi Ferrer Orri kexue li Elizabeth M.Tennyson Weiwei li Fabio Matteocci Gunnar Kusch Narges Yaghoobi Nia Rachel A.Oliver Judith L.MacManus-Driscoll Katie L.Moore Samuel D.Stranks Aldo Di Carlo Giorgio Divitini Caterina Ducati Department of Materials Science and Metallurgy University of Cambridge27 Charles Babbage RoadCambridge CB30FSUK Centre for Hybrid and Organic Solar Energy(CHOSE) Department of Electronic EngineeringUniversity of Rome Tor VergataRome 00133Italy Cavendish Laboratory University of CambridgeJJ Thomson AvenueCambridge CB30HEUK Department of Materials and Photon Science Institute University of ManchesterOxford RoadManchester M139PLUK Department of Chemical Engineering and Biotechnology University of CambridgePhilippa Fawcett DriveCambridge CB30ASUK Laboratory for Advanced Solar Energy(LASE) National University of Science and Technology MISiSLeninskiy Prospekt 4Moscow 119049Russia Energy Research Institute@NTU Nanyang Technological University50 Nanyang DriveSingapore 637553Singapore MIIT Key Laboratory of Aerospace Information Materials and Physics College of PhysicsNanjing University of Aeronautics and AstronauticsNanjing 211106China Istituto di Struttura della Materia-CNR(ISM-CNR) Via del Fosso del Cavaliere 100Rome 00133Italy Electron Spectroscopy and Nanoscopy Istituto Italiano di TecnologiaVia Morego 30Genova 16163Italy

Most thin-film photovoltaic modules are constructed on soda-lime glass(SLG)substrates containing alkali oxides,such as Na_(2)*** may diffuse from SLG into a module's active layers through P1 lines,an area between a module's constituent cells where the substrate-side charge transport layer(CTL)is in direct contact with *** diffusion from SLG is known to cause several important effects inⅡ-Ⅵand chalcogenide solar modules,but it has not been studied in perovskite solar modules(PSMs).In this work,we use complementary microscopy and spectroscopy techniques to show that Na diffusion occurs in the fabrication process of *** diffuses vertically inside P1 lines and then laterally from P1 lines into the active area for up to 360 *** propose that this process is driven by the high temperatures the devices are exposed to during CTL and perovskite *** diffused Na preferentially binds with Br,forming Br-poor,l-rich perovskite and a species rich in Na and Br(Na-Br)close to P1 ***-Br passivates defect sites,reducing non-radiative recombination in the perovskite and boosting its luminescence by up to 5×.Na-Br is observed to be stable after 12 weeks of device storage,suggesting long-lasting effects of Na *** results not only point to a potential avenue to increase PSM performance but also highlight the possibility of unabated Na diffusion throughout a module's lifetime,especially if accelerated by the electric field and elevated temperatures achievable during device operation.

关键词： defect passivation monolithic interconnection perovskite solar modules soda-lime glass sodium diffusion solar cells thin-film photovoltaics

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数据链技术在“智慧港口物流”系统中的应用

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物流技术 2013年第8期32卷 266-268页

作者：李可学江苏联合职业技术学院南通分院

基于对"智慧港口物流"系统的分析,探讨了数据链基本技术及实际应用,分析了该技术在"智慧港口物流"系统架构中的应用模式,提出了在"智慧港口物流"系统中应用该技术的建议,给出了对某港口物流作业区域数据链节点群遍历访问的仿真算法。"... 详细信息

基于对"智慧港口物流"系统的分析,探讨了数据链基本技术及实际应用,分析了该技术在"智慧港口物流"系统架构中的应用模式,提出了在"智慧港口物流"系统中应用该技术的建议,给出了对某港口物流作业区域数据链节点群遍历访问的仿真算法。"智慧港口物流"数据链以"M2M"方式工作,构成了港口物流现场感知系统(各种智能传感器、RFID或嵌入式系统)、作业进程及机电设备、各级管理信息节点的有效链接,实现了链路平台的自动化、一体化和网络化。

关键词：数据链技术智慧港口物流应用

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Perovskite/GaAs-nanowire hybrid structure photodetectors with ultrafast multiband response enhancement by band engineering

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Photonics Research 2023年第4期11卷 541-548页

作者： XIAOBING HOU XITONG HONG FENGYUAN liN JINZHI CUI QIAN DAI QIANLEI TIAN BINGHENG MENG YANJUN liU JILONG TANG kexue li LEI liAO ZHIPENG WEI State Key Laboratory of High Power Semiconductor Lasers College of PhysicsChangchun University of Science and TechnologyChangchun 130022China State Key Laboratory for Chemo/Biosensing and Chemometrics College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China Department of Laser Photoelectric Technology Southwest Institute of Technical PhysicsChengdu 610041China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Zhongshan Institute of Changchun University of Science and Technology Zhongshan 442000China

We developed a hybrid structure photodetector combining one-dimensional(1D)inorganic GaAs nanowires and two-dimensional(2D)organic perovskite materials,which can achieve various performance enhancements using a relatively simple *** the optical absorption enhancement of perovskite and the type-II energy band structure formed by the heterostructure,the responsivity and detectivity of the photodetector from ultraviolet(UV)to visible(Vis)wavelengths are significantly enhanced,reaching 75 A/W and 1.49×10^(11)Jones,*** response time of the photodetector was significantly decreased by 3 orders,from 785 ms to 0.5 ms,and the dark current was further reduced to 237 fA.A photodetector was prepared with enhanced responsivity and ultrafast response time in the multiband region from the UV to Vis *** the best of our knowledge,this is the first time to combine inorganicⅢ-ⅤGaAs nanomaterials with organic perovskite materials,which verifies the effective combination of inorganic and organic materials in a mixed *** excellent photoelectric performance of the perovskite/GaAs-nanowire hybrid structure photodetector makes it a potential candidate material for a wide range of photoelectric applications such as multiband photodetection.

关键词： perovskite nanowires inorganic

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基于两平行线及其线上三点的摄像机标定方法

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光学技术 2016年第6期42卷 545-551页

作者：贺科学李树涛胡建文湖南大学电气与信息工程学院湖南长沙410082 长沙理工大学电气与信息工程学院湖南长沙410076

在大视场交通监控摄像机的标定中,由于不便于放置大尺寸标定靶标,常采用交通标线构成的特定几何图形替代标定靶标,但许多交通场景仅有一组平行的车道分界交通标线,难以获得传统标定方法所需的标定约束条件。针对此类交通场景,选取两平... 详细信息

在大视场交通监控摄像机的标定中,由于不便于放置大尺寸标定靶标,常采用交通标线构成的特定几何图形替代标定靶标,但许多交通场景仅有一组平行的车道分界交通标线,难以获得传统标定方法所需的标定约束条件。针对此类交通场景,选取两平行交通标线和其中一条线上的三点作为标定参考物,依靠其中一条线上三点在单幅图像中的像素坐标、三点间的两个距离值及平行线间距作为约束条件来完成摄像机的标定。建立了图像坐标系与世界坐标系之间新的换算关系,推导出了摄像机内外参数的求解公式,探讨了旋转角对测量误差的影响。实验结果表明,在约束条件不足的情况下能够获得较好的摄像机参数近似解,沿道路方向上的测距精度优于对比文献的结果,具有标定参考物选取容易、操作简便、几何约束条件少等优点,适用于交通监控系统中大视场摄像机的快速标定场合。

关键词：光学测量摄像机标定智能交通系统交通标线

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Flanker任务诱发中枢疲劳的神经递质机制研究——基于ET技术

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中国运动医学杂志 2019年第4期38卷 281-288页

作者：吴梅婷林岭李克雪吴燕宁波市体育训练工作大队宁波315500 宁波大学体育学院宁波315211 杭州高级中学杭州310021 安徽职业技术学院合肥233030

目的:基于脑波超慢涨落技术(ET)探讨Flanker任务诱发中枢疲劳的机制。方法:以38名宁波大学运动系本科学生为被试,45 min Flanker操作任务为自变量,ET指标、行为学数据(包括正确率和反应时)、心率变异指标(HRV)为因变量。比较实验组(进行... 详细信息

目的:基于脑波超慢涨落技术(ET)探讨Flanker任务诱发中枢疲劳的机制。方法:以38名宁波大学运动系本科学生为被试,45 min Flanker操作任务为自变量,ET指标、行为学数据(包括正确率和反应时)、心率变异指标(HRV)为因变量。比较实验组(进行45 min flanker任务,n=19)和对照组(不进行flanker任务只静坐45 min,n=19)实验前后的差异,探讨Flanker任务是否能诱导出中枢疲劳及S谱系的变化。结果:①实验组的正确率(P0.05);实验前两组的SDNN之间无显著性差异(P>0.05),但在实验后实验组显著高于对照组(P0.05);低频段功率值(LF)、LF/HF在各组组内实验前后和两组间均不存在显著差异(P>0.05);④对照组S4系(代表5-羟色胺)在实验前后无显著性变化(P>0.05),但实验后实验组的S4系不仅显著高于实验前(P0.05);其他S谱系在各组组内前后和两组之间比较均无显著性差异(P>0.05);⑤实验组完成45 min Flanker任务后的S4指标与反应时呈中度正相关(r=0.569,P<0.05),与HRV中的RMSSD(r=0.496,P<0.05)和HF(r=0.550,P<0.05)呈中度正相关。结论:45 min Flanker任务可以诱发中枢疲劳;45 min Flanker任务诱发的中枢疲劳与S4升高有关。

关键词：认知操作脑功能神经递质脑波超慢涨落技术

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职业环境对中国飞行员认知影响的ERP研究文献分析与展望

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航天医学与医学工程 2017年第5期30卷 384-390页

作者：林岭王巧玲李克雪赵国华宁波大学浙江宁波315211 浙江省杭州高级中学浙江杭州310021

通过文献分析总结了我国飞行员认知的事件相关电位(event related potentials,ERP)研究现状、特点及不足,提出了未来的研究方向。结论:1)目前及未来5年我国相关研究处于指数或线性增长阶段;2)相关研究视角主要集中于飞行员的一般及专项... 详细信息

通过文献分析总结了我国飞行员认知的事件相关电位(event related potentials,ERP)研究现状、特点及不足,提出了未来的研究方向。结论:1)目前及未来5年我国相关研究处于指数或线性增长阶段;2)相关研究视角主要集中于飞行员的一般及专项认知能力特征,模拟低氧、失重、睡眠剥夺与中枢疲劳对飞行员认知加工能力的影响等;3)相关研究还存在生态效度不高、研究设计简单、民航飞行员研究缺失等不足;4)根据存在问题及实践需要提出了未来研究的主要方向。

关键词：飞行员认知 ERP

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生物系统中受激的相干电磁辐射

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激光 1982年第1期 41-44页

作者：李克学中国科学院物理研究所

最近***用最精密的物理仪器重新研究了生物细胞的超弱光子发射现象,被认为是一种相干的受激过程,引起一些科学家们的热烈讨论。本文从物理学角度分析了生物细胞产生相干受激发射的条件与可能性,并认为这是一个值得重视的发展。

关键词：受激发射激光发射生物系统超弱光子原子分子能级反转反转分布电磁辐射

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