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Brightness and Lifetime Improved Light-Emitting Diodes from Sr-Doped Quasi-Two-Dimensional Perovskite Layers

Tsinghua Science and technology 2023年第1期28卷 131-140页

作者： Dan Chen Taoran Liu Yuhua Zuo Chuanbo Li Jun Zheng Zhi Liu Baoyu Liu Buwen Cheng State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Science Minzu University of ChinaBeijing 100081China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for SensorMOE Key Laboratory for Modern Measurement and Control Technologyand Beijing Information Science and Technology UniversityBeijing 100101China

Green Perovskite Light-Emitting Diodes(PeLEDs)have attracted wide attention for full spectrum ***,the inferior film morphology and luminescence property of quasi-two-dimensional(quasi-2D)perovskite layers limit the photoelectric property of the *** this paper,the effect of strontium(Sr)doped in quasi-2D perovskite layers is investigated to obtain a high-quality active *** morphologies and optical properties of Sr-doped quasi-2D perovskite films with different concentrations are *** the addition of strontium,more low-dimensional-layer perovskite phases(n D 2 and n D 3)appear in quasi-2D perovskite films,providing efficient intraband carrier funneling pathway and facilitating radiative *** photoluminescence(PL)peak intensity of optimized Sr-doped quasi-2D perovskite layers increases 50%compared with the non-strontium ***,green PeLEDs based on a Sr-doped quasi-2D perovskite layer reach a maximum luminance(Lmax)of 2943.77 cd/m^(2),which is three times of the control *** electroluminescence(EL)peaks of Maximum External Quantum Efficiency(MEQE)and Lmax of Sr-doped PeLEDs exhibite a slight shift,indicating the excellent stability and performance of Sr-doped *** optimized device can continuously operate for 360 s at MEQE driving voltage,resulting in a half-lifetime of60 s,which is 3-fold greater than that of the control PeLEDs.

关键词： Perovskite Light-Emitting Diodes(PeLED) Sr-doped brightness improved lifetime increased

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A fibre optic angle sensing tape for applications in robotics and automation 13

A fibre optic angle sensing tape for applications in robotic...

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Optical measurement Systems for Industrial Inspection XIII 2023

作者： Pillai, Sivaji Charrett, Thomas O.H. Kissinger, Thomas James, Stephen W. Tatam, Ralph P. Engineering Photonics Cranfield University MK43 0AL United Kingdom Institute of Process Measurement and Sensor Technology Technical University of Ilmenau PF 100565 Ilmenau98694 Germany

ISBN: (数字)9781510664463

ISBN: (纸本)9781510664456

A dual-fibre single-plane angle-sensing tape that utilizes optical Fibre Segment Interferometry and Range-Resolved Interferometry (RRI) for angle sensing is presented. The sensing tape facilitates the multiplexing of an array of angle sensors along its length and can be retrofitted into small robots and construction equipment. We demonstrate its application on three non-rotational joints of a small five-axis robot, describing the design, construction, measurement principle, and presenting measurement results. Preliminary data shows that the angles measured by the sensing tape exhibited agreement within a range of ±0.005◦ with the manufacturer-installed angle encoder of the robot. © 2023 SPIE.

关键词： Interferometry

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Optical Fibre Based Angle measurement for Robotic Joints 28

Optical Fibre Based Angle Measurement for Robotic Joints

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28th International Conference on Optical Fiber sensors, OFS 2023

作者： Pillai, Sivaji Charrett, Thomas O.H. Kissinger, Thomas Barrington, James H. James, Stephen W. Tatam, Ralph P. Engineering Photonics Cranfield University MK43 0AL United Kingdom Institute of Process Measurement and Sensor Technology Technical University of Ilmenau PF 100565 Ilmenau98694 Germany

ISBN: (纸本)9781957171302

A multiplexed array of optical fibre based angle sensors for deployment on multiple joints of a robotic arm is demonstrated. Two optical fibres, each containing an array of fibre segment interferometers, are bonded either side of the neutral axis of a thin, flexible metal tape. Differential measurement of the phases of corresponding interferometers in the two fibres yields an angle measurement with resolution better than 0.001◦ over a bandwidth of 21 kHz when demodulated using the principles of range resolved interferometry. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Optical fibers

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An ultrastable metrology laser for traceable length metrology in nanopositioning machines – Towards a 10−12 uncertainty level

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measurement: sensors 2025年 38卷

作者： Blumröder, Ulrike Köchert, Paul Fröhlich, Thomas Ortlepp, Ingo Kissinger, Thomas Manske, Eberhard Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology Ilmenau Germany Precision Engineering Division Braunschweig Germany

In this contribution we propose the incorporation of a diode laser stabilized to an ultrastable cavity (ORS) as a metrology laser within the interferometric length measurement system of a nanopositioning and -measuring machine with a lateral measurement range of 200 mm. Based on a frequency instability analysis of the ORS against a GPS-referenced frequency comb we observed a frequency drift of 6.2 kHz(Δf/f = 1.3∙10−11) during the course of one day and peak-to-peak variations below 81 kHz (Δf/f = 1.7∙10−10) over observation times up to ten days. Within daily operation of the NPMM-200, the influence of cavity-related frequency changes practically falling below the current digital resolution limit of the interferometric measurement system (2.86∙10−11) and can therefore be neglected, if a sufficient predetermination of the absolute frequency using an optical frequency comb has been applied. To guarantee an absolute tracking of the laser frequency within a non-stop service operation of the ORS at an uncertainty level of 1∙10−12, a suitable correction for the long-term frequency changes of the cavity with the help of the frequency comb has to be established. © 2024

关键词： Frequency stability

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Direct Comparison of the Strain measurement Performance of Fibre Bragg Gratings and Fibre Segment Interferometry 28

Direct Comparison of the Strain Measurement Performance of F...

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28th International Conference on Optical Fiber sensors, OFS 2023

作者： Barrington, James H. Kissinger, Thomas James, Stephen W. Tatam, Ralph P. Centre for Engineering Photonics Cranfield University CranfieldMK43 0AL United Kingdom Institute of Process Measurement and Sensor Technology Technical University of Ilmenau PF 100565 Ilmenau98694 Germany

ISBN: (纸本)9781957171302

The strain sensing performance of an optical fibre Bragg grating (FBG), demodulated using a state-of-the-art commercial interrogator, is compared directly with that of a fibre segment interferometer (FSI) of near equivalent gauge length. It is shown that the FSI segment displayed a 5 fold improvement in noise, 1 nΕ/√Hz for a bandwidth of 1 kHz, compared to 5 nΕ/√Hz at 1 kHz to that of the FBG. Furthermore, by exploiting a longer gauge length, it was also demonstrated that this could further reduce noise levels. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Fiber Bragg gratings

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Influences on the propagation of light beams by the near surface layer of atmosphere and the correction methods 6

Influences on the propagation of light beams by the near sur...

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6th Conference on Frontiers in Optical Imaging and technology: Imaging Detection and Target Recognition

作者： Yunqiang, Lai Shangmin, Lin Hu, Wang Xuan, Zhang Yu, Jin Wenlong, He Yaoke, Xue Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences Xi’an710119 China Beijing101408 China Xi’an Space Sensor Optical Technology Engineering Research Center Xi'an710119 China Key Laboratory of Space Precision Measurement Technology Chinese Academy of Sciences Xi’an710119 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

With the increasingly widespread and important application of optics in modern human life and production, research on the propagation characteristics and correction methods of light beams in the atmosphere near the ground surface is becoming increasingly important. The complex atmospheric environment near the ground can affect the propagation of light beams, causing effects such as energy attenuation, beam expansion, beam drift, intensity flicker, phase fluctuations, etc., reducing the quality of beam propagation and affecting the performance of optical applications in various fields. A review was conducted on the impact of near-Earth atmosphere on beam propagation and its correction methods, mainly elaborating on the effects of atmospheric absorption, scattering, and turbulence on beam propagation. Correction methods such as adaptive optics, large aperture receiving, spatial diversity, partially coherent light propagation, and image processing are proposed. © 2024 SPIE. All rights reserved.

关键词： Optical data processing

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Simulation of a temperature-compensated palladium-based fiber optic hydrogen sensor and comparison with measurements

Simulation of a temperature-compensated palladium-based fibe...

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2023 European Workshop on Optical Fibre sensors, EWOFS 2023

作者： Buchfellner, Fabian Bian, Qiang Röhrl, Alexander Zhang, Fan Hu, Wenbin Yang, Minghong Koch, Alexander W. Roths, Johannes Photonics Lab Munich University of Applied Sciences Munich80335 Germany Institute for Measurement Systems and Sensor Technology Technical University Munich Munich80333 Germany National Engineering Research Center for Optical Fiber Sensing Technology Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781510665002

A temperature-compensated sensor architecture for a fiber optic hydrogen sensor consisting of a partly palladium-coated pi-shifted fiber Bragg grating was modeled and compared with measurements. The transfer matrix formalism was used to calculate the spectral line shape of the pi-shifted FBG with a hydrogen-induced, non-homogeneous strain distribution along the grating axis. The temperature response of the grating itself can be compensated by referencing the notch to the flank wavelength. In addition, the hydrogen solubility in Pd shows a non-linear temperature dependence that was also included in the sensor performance calculations. For the investigated H2 concentration range of 200 ppm to 20000 ppm and between 15 °C and 40 °C, measurement data fit well to the simulation above 3000 ppm but become diffuse below, indicating deviations from the expected dependence according to Sieverts’ square root law. © 2023 SPIE.

关键词： Fiber Bragg gratings

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Simulation Study of Surface Acoustic Wave sensors for Soil Parameter Monitoring

Simulation Study of Surface Acoustic Wave Sensors for Soil P...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Zhenyu Wu Tianqi Lu Ammar Al-Hamry Anurag Adiraju Ge Shi Siqi Liu Swaranpreet Kaur Surinder Singh Olfa Kanoun Professorship of Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Department of Physics Sant Longowal Institute of Engineering & Technology Longowal Sangrur Punjab India Department of Electronics and Communication Engineering Sant Longowal Institute of Engineering & Technology Longowal Sangrur Punjab India

ISBN: (数字)9798331542726

ISBN: (纸本)9798331542733

Soil parameters such as moisture, pH, and salinity are essential for agricultural productivity and environmental management. However, traditional monitoring methods, while accurate, are time-consuming and lack real-time capabilities, limiting their suitability for precision agriculture. Surface acoustic wave (SAW) sensors offer a promising alternative due to their high sensitivity, robustness, and real-time monitoring capabilities. In this study, a SAW sensor was designed and simulated using COMSOL Multiphysics to detect soil moisture. The sensor design employs a lithium tantalate piezoelectric substrate and interdigitated transducers (IDTs), with graphene oxide (GO) as a functional coating to enhance sensitivity. Simulation results showed that at a GO coating thickness of 350 nm, the sensor achieved the highest frequency shift at 70% relative humidity, demonstrating optimal sensitivity. Additionally, dynamic response analysis revealed that as humidity increased from 0% to 100%, the response time grew nonlinearly from 2.5 seconds to 42.2 seconds. The simulation results of the nonlinear growth trend of the optimal coating thickness and response time provide a clear direction for practical humidity sensor design optimization, dynamic environmental adaptation analysis, and future experimental validation and development. This study provides a theoretical foundation for the development of SAW-based soil sensors and outlines future directions for expanding functionality to monitor pH and salinity. Future work will focus on transitioning to 3D FEM models, experimental validation, and advanced material development. Fabricating actual sensors and validating simulations with experimental data will ensure reliability, supporting the broader application of SAW sensors in precision agriculture and environmental management.

关键词： Temperature sensors Precision agriculture Solid modeling Sensitivity Simulation Surface acoustic waves Humidity sensors Finite element analysis Monitoring

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DESIGN SPACE OPTIMIZATION FOR sensor-INTEGRATION IN STANDARDIZED MACHINE ELEMENTS

DESIGN SPACE OPTIMIZATION FOR SENSOR-INTEGRATION IN STANDARD...

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ASME 2024 International Mechanical engineering Congress and Exposition, IMECE 2024

作者： Peters, Julian Menning, Johannes D.M. Ewert, Arthur Prokopchuk, Artem Breimann, Richard Herbst, Felix Riehl, David Döllken, Markus Vorrath, E.-F. Markus Wallmersperger, Thomas Schlecht, Berthold Kirchner, Eckhard Kupnik, Mario Hofmann, Klaus Matthiesen, Sven Institute of Product Engineering Karlsruhe Institute of Technology Germany Institute of Solid Mechanics Technische Universität Dresden Germany Institute of Machine Elements and Machine Design Technische Universität Dresden Germany Institute of Semiconductors and Microsystems Technische Universität Dresden Germany Institute for product development and machine elements Technical University of Darmstadt Germany Measurement and Sensor Technology Group Technical University of Darmstadt Germany Integrated Electronic Systems Lab Technical University of Darmstadt Germany

ISBN: (纸本)9780791888599

In industrial digitization, data-driven analysis like condition monitoring and predictive maintenance relies on extensive measurement data. However, there’s often a lack of data on machine or system states. sensor-integrating machine elements (SiME) can address this gap due to their widespread use, standardization, and in-situ measurement capability. Yet, integrating sensors typically compromises mechanical function. To ensure broad usability and retrofitting, maintaining mechanical functions to a defined degree is crucial. General procedures for systematically finding optimal design space solutions are lacking. In prior work, a procedure was developed for multi-axial force sensor integration into M20 bolts. This contribution demonstrates the procedure’s applicability to (1) M12 bolts for uni-axial force measurements using strain gauges, and (2) jaw couplings for torque measurement using capacitive sensors. Results indicate the procedure’s efficacy in both cases, yielding viable design space parameters. However, constructing an optimization function for jaw couplings in the final step was not feasible, as both mechanical and sensory function fulfillment indices pointed in the same direction. © 2024 by ASME.

关键词： Bolts

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First prototype of a positioning device with subatomic resolution 22

First prototype of a positioning device with subatomic resol...

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22nd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2022

作者： Hebenstreit, Roman Wedrich, Karin Strehle, Steffen Manske, Eberhard Theska, René Technische Universität Ilmenau Department of Mechanical Engineering Institute for Design and Precision Engineering Precision Engineering Group Germany Technische Universität Ilmenau Department of Mechanical Engineering Institute of Micro- and Nanotechnologies Microsystems Technology Group Germany Technische Universität Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Germany

ISBN: (纸本)9781998999118

In the forthgoing work on a device that enables subatomic resolved highly reproducible positioning, a first prototype is here presented. The entire positioning system including the actuator, sensor and guiding mechanism, is realized as a micro-electro-mechanical system (MEMS) on chip level, based on silicon-on-insulator (SOI) technology. A modular printed circuit board acts as the mechanical as well as the electrical contacting interface for the silicon chip. First variants of a linear positioning system comprising axisymmetric double parallel crank structure are investigated. Pivot joints as flexure hinges with concentrated compliance are deployed. These hinges show minimal rotational axis displacement for small angles of deflection, thus ensuring smallest deviations to a straight-line path of the linear guiding mechanism. An electrostatic comb actuator transmits forces contactless to minimize over constraints. A measuring bridge in differential mode utilizes the same comb structures to measure the table position based on the capacitance change. Estimating the position resolution, limited by the resolution of the capacitive sensor, a measurable step width below 50 pm can be expected. In further steps, the device will be a platform to be equipped with a lattice-scale-based position measurement system according to achieve an even higher resolution and reproducibility. © European Society for Precision engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Capacitive sensors

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