- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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2.1: Highly Efficient Quantum-dot Light Emitting Diodes with Metal-oxide Transport Layer
摘要： Metal doped ZnO material is introduced in this study for highly efficient quantum-dot light-emitting diode. Compare to ZnO used as electron transporting layer (ETL), the metal doped ZnO ETL based inverted green quantum-dot light emitting diodes (G-QLEDs) exhibit the high efficiency with 49.2 cd/A and 49.8 lm/W for maximum current and power efficiencies, respectively, which is much higher than that of ZnO ETL based one.
关键词： Quantum-dots,Electron transporting layer,QLEDs,High efficiency QLEDs
更新于2025-09-10 09:29:36
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High efficient linear polariser using FSS structure
摘要： A linear polarisation converter surface with broadband and high-efficiency properties is proposed. The proposed frequency selective surface (FSS) polariser consists of two-corner-cut diagonal rectangular printed on a substrate backed by a pinwheel loop shape ground. The combination of two-corner-cut diagonal rectangular patch and pinwheel loop shape ground contributes to bandwidth expansion. Numerical results indicate that the FSS structure is capable of converting x or y polarised incident wave to the relevant cross-polarised wave in a wide frequency range from 7.5 to 24.5?GHz with a fractional bandwidth of 106% for ?10?dB rxy reflection amplitude. In addition, the ryy and rxy reflection coefficients of the proposed unit-cell present slight variation for different incident angles up to 40°, which verifies the applicability of the proposed FSS structure in a practical environment. For experimental validation, a prototype of the FSS structure is fabricated and reflection parameters of the proposed structure are measured which agree well with corresponding simulations. Due to the minimal dependency on the angle of incidence and non-uniform ground plane the proposed polarisation converter unit-cell can be a possible choice for secure building applications.
关键词： broadband,linear polarisation converter,frequency selective surface,FSS structure,high-efficiency
更新于2025-09-10 09:29:36
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[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Bi-layer Metamaterial based Broadband Linear Polarization Converter under Two Coherent Beam Illumination
摘要： We demonstrate a bi-layer metamaterial structure with mirror symmetry that acts as a linear polarization converter under two-antisymmetric-beam illumination. Its high performance, including broad bandwidth, high transmittance and high efficiency, originates from the combination of two interference processes: the Fabry-Pérot-like cavity effect between two metallic patterned layers and coherent excitations of spatially separated subwavelength resonators. Terahertz (THz) experiments show good agreement with numerical simulations.
关键词： Fabry-Pérot-like cavity,broadband,THz experiments,linear polarization converter,high efficiency,bi-layer metamaterial,coherent excitations,high transmittance
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - A High Efficiency Multi-Receiver Wireless Power Transfer System with Unanimous Power Reception at a Certain Angle
摘要： This paper presents a high efficiency magnetically coupled resonant wireless power transfer(MCR-WPT) system which can achieve uniform power distribution for five receivers that are at different positions and an angle with the horizontal plane. Both the receiver and transfer coils utilize a single coil structure. This paper analyzes the change of the coupling coefficient with the variation of angle of the non-axial receiver coil. In order to make the non-axial receiver gets the maximum power, it is necessary to adjust the coupling coefficient to the maximum by deflecting the receiver an angle. A prototype is fabricated and tested. The simulation and test results are in good agreement. The overall system efficiency reaches 89.16%, and the five receivers can receive almost the same power.
关键词： non-axial receiver,unanimous power reception,high efficiency,Multi-Receivers,wireless power transfer(WPT)
更新于2025-09-09 09:28:46
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Boosting the efficiency of carbon-based planar CsPbBr3 perovskite solar cells by a modified multistep spin-coating technique and interface engineering
摘要： All-inorganic CsPbBr3 perovskite solar cells (PSCs) have attracted tremendous attentions in the photovoltaic field these days in view of their outstanding stability, especially thermal stability. However, the bromide-rich perovskite, such as CsPbBr3, always suffer from a low phase-purity and poor morphology synthesized by traditional two-step deposition route. Herein, we demonstrate a facile multistep spin-coating strategy to fabricate high-quality CsPbBr3 films on the low-temperature processed compact TiO2 (c-TiO2) electron transport layer (ETL) of the carbon-based PSCs. As-prepared films exhibit more homogeneous with higher CsPbBr3-phase purity and larger average grain sizes up to 1 μm, compared to those prepared through traditional two-step deposition process. The champion power conversion efficiency (PCE) of the planar CsPbBr3 PSC is boosted from 7.05% to 8.12%, getting an increase by 15.2%, due to the increased crystallinity and light-harvesting ability as well as reduced trap states of the CsPbBr3 film. To further enhance the device performance, a SnO2 thin layer with much higher carrier mobility than TiO2 is introduced to passivate the c-TiO2 ETL. It is found that the SnO2 layer can not only improve the surface morphology of the ETL, but also reduce the current shunting pathways in the c-TiO2. The TiO2/SnO2 bilayered ETL possesses a superior electron extraction capability, beneficial to the charge transport and suppression of the interfacial trap-assisted recombination. The best-performing TiO2/SnO2-based CsPbBr3 PSC delivers an excellent fill factor of 0.817 and a high PCE of 8.79%, which is the highest efficiency for planar CsPbBr3 PSCs reported to date. More importantly, the unencapsulated all-inorganic PSCs show a promising humidity and thermal stability with no decline in efficiency when stored in ambient air at room temperature (25 oC) for over 1000 h and 60 oC for one month, respectively. Our work pave the ways for practical applications of cost-effective, highly efficient and stable all-inorganic PSCs.
关键词： carbon-based,TiO2/SnO2,low cost,CsPbBr3,multistep spin-coating,high efficiency and stability
更新于2025-09-09 09:28:46
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[IEEE 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Xuzhou (2018.7.21-2018.7.24)] 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - A New Design for Spoof Surface Plasmon Polaritons Using Periodic Holes Etched on the Stripline
摘要： In this paper, a symmetrical ultrathin spoof surface plasmon polaritons (SSPPs) is realized based on the traditional coplanar waveguide (CPW), which can achieve multi-band high-efficiency transmission by employing the periodic holes etched on the middle stripline. Physical mechanism of the proposed SSPPs is explained by using the dispersion curves and electric field distributions. The measured results have a good agreement with the simulated ones, which indicate that the proposed SSPPs will be potentially very useful for microwave applications.
关键词： multi-band,spoof surface plasmon polaritons,high-efficiency transmission
更新于2025-09-09 09:28:46
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[IEEE 2018 13th European Microwave Integrated Circuits Conference (EuMIC) - Madrid, Spain (2018.9.23-2018.9.25)] 2018 13th European Microwave Integrated Circuits Conference (EuMIC) - Design and Implementation of an Encapsulated GaN X-Band Power Amplifier Family
摘要： This paper describes the design and verification results of two wideband class AB High Power Amplifiers (PA), encapsulated in commercial packages. Both amplifiers designed on WIN Semiconductors’ 0.25 μm GaN on SiC technology. The selected GaN process features compact common-source (CS) transistor layouts with individual source grounding vias. The family spans the whole X-band frequency with the first design tuned between 7-11 GHz and the second design tuned between 10-12 GHz. Both designs have saturated power output greater than 25 W throughout the whole bandwidth with peak power added efficiency at 30%. A multistage power combining matching strategy to achieve a tradeoff in wideband performance and power output is given. In depth discussion of the MMIC design of the PAs is supported by a discussion of the thermal management of the packages, including the PCB design and active cooling methodology, in order to present a fully functional PA family.
关键词： pseudomorphic high electron mobility transistor (pHEMT),X-Band,wideband amplifiers,high efficiency,Power Amplifier (PA),thermal analysis,EM simulation,monolithic microwave integrated circuit (MMIC)
更新于2025-09-04 15:30:14
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - High Power High Efficiency 270-320 GHz Source Based on Discrete Schottky Diodes
摘要： A 300 GHz source based on discrete Schottky diodes technology is reported in this work. The high frequency part developed by ACST consists of two high power and high efficiency doublers, one at 135-160 GHz and a second one at 270-320 GHz. Both doublers feature a single chip per module and do not use any power combining techniques. The 150 GHz and 300 GHz doublers are able to handle more than 400 mW and 100 mW input power and provide more than 140 mW and 30 mW output power, respectively. This is the most powerful 300 GHz source reported based on discrete Schottky diodes at this frequency range without using power combining.
关键词： Schottky diodes,high efficiency,high power,frequency multipliers
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Design of 20 kW Full-SiC, Three-level Three-Phase Uninterruptible Power Supply
摘要： In this paper, design and implementation for high efficiency 20 kW, 480 ??????, 800 ?????? full-SiC based UPS has been presented. Loss of commercial 2-level and 3-level modules are compared based on the datasheet values. Based on the result, a 3-level NPC topology has been selected which showed higher efficiency for high switching frequency range compared to 2-level case. A double-pulse test has been conducted to extract switching-loss with a designed gate driver. A lumped parameter thermal circuit simulation has been conducted to simulate the rise of junction temperature and conduction loss. A LCL filter has been designed to meet a THD requirement while the loss and power-density are optimized. The operation and efficiency has been verified by a prototype UPS. For double-conversion efficiency, 97.6% at full load can be achieved which is equivalent to 98.8 % per single AC-DC conversion.
关键词： high efficiency,SiC-based AC-DC converter,Uninterruptible power supply
更新于2025-09-04 15:30:14