- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Curtailing the Overpotential of Lia??CO2 Batteries with Shapea??Controlled Cu2O as Cathode: Effect of Illuminating the Cathode
摘要： Li-air batteries are circumscribed to lab-scale research due to the uninterrupted formation of discharge products. In the case of Li–CO2 batteries, the increase in overpotential due to Li2CO3 formation results in cell death. In this study, we have synthesized Cu2O crystals having three different types of shapes, i.e., cubic, octahedral, and rhombic, to compare the catalytic activity toward CO2 reactions. The full-cycle and long-term stability test reveals that rhombohedral Cu2O facilitates Li2CO3 decomposition more efficiently than that of cubic and octahedral Cu2O. We have extended the cycle to dig into the photocatalytic activeness of the rhombic Cu2O by illuminating the cell. The repeated cycles to 1 h show maximum overpotential of 1.5 V, which is 0.5 V less than that of the cell without illumination. A postmortem analysis of the cell after dividing the cycles into segments demonstrates interesting results on the role of light and Cu2O during the cell cycle.
关键词： Li-CO2 batteries,Shape evolution,Cu2O cathode catalyst,Illumination effect,Charge overpotential
更新于2025-09-16 10:30:52
-
Wavelength-selective degradation of perovskite-based solar cells
摘要： The J-V characteristics of perovskite-based solar cells were measured under selective irradiation in three different domains of the solar spectrum: blue, red and near infrared (NIR). It was found out that even in the inert atmosphere a long-term exposure to both blue and red sources leads to formation of PbI2, but in the former case the degradation of hybrid perovskite is greater due to further photolysis of PbI2. Consequently, the cell performance under illumination with the red light decreases insignificantly. The NIR irradiance improves the perovskite stoichiometry so that the photovoltaic parameters of the cells increase with the exposure time. These features are undistinguishable under continuous sunlight. Therefore, the wavelength-selective J-V measurements piece together the jigsaw of light-induced degradation of hybrid perovskites and open new strategies for the improvement of the device stability.
关键词： illumination range,solar cells,morphology,perovskites
更新于2025-09-12 10:27:22
-
Localization microscopy at doubled precision with patterned illumination
摘要： MINFLUX offers a breakthrough in single molecule localization precision, but is limited in field of view. Here we combine centroid estimation and illumination pattern induced photon count variations in a conventional widefield imaging setup to extract position information over a typical micrometer-sized field of view. We show a near two-fold improvement in precision over standard localization with the same photon count on DNA-origami nanostructures and tubulin in cells, using DNA-PAINT and STORM imaging.
关键词： DNA-origami,DNA-PAINT,patterned illumination,tubulin,STORM,Localization microscopy
更新于2025-09-12 10:27:22
-
Reducing Defects in Perovskite Solar Cells with White Light Illumination-Assisted Synthesis
摘要： Defects lower the performance of perovskite solar cells by playing as recombination centers of carriers and migration channels of ions under illumination. Here we used various kinds of lights to assist the synthesis of perovskite in the sequential vapor deposition of perovskite. Without applying light, iodine accumulated on the film surface and plenty of defects existed in the as-fabricated device. White light forced more iodine into the film bulk, removing excess iodine on the surface and leading to improved iodine homogenization and consequently most defects were annihilated. Devices with perovskite synthesized under white light showed improved efficiency and light stability than those prepared in the dark. Tri-cation-based devices with over 20% efficiency under simulated solar light were successfully fabricated; on the contrary, control devices prepared in the dark showed only 18.3% efficiency. This finding suggests the possibility of kinetically controlling the synthesis of perovskite using low-intensity white illumination.
关键词： defects,perovskite solar cells,efficiency,synthesis,stability,white light illumination
更新于2025-09-12 10:27:22
-
Multi-physics effects on the performance of Dense-array Concentrator Photovoltaic System
摘要： In this paper, the multi-physics effects on the performance of dense array concentrator photovoltaic (DA-CPV) system are investigated in detail by considering CPV module connections, non-uniform illumination, and temperature distribution. It is observed that the optimized module configuration can significantly reduce the overall cells temperature and then improve the efficiency and stability. We also analyze the effects of temperature uniformity on output performance. When the illumination, configuration and mean temperature are certain, the temperature distribution can affect the output performance of the DA-CPV system. In the case of non-uniform illumination, the maximum power of the module will be achieved with an inverse Gaussian temperature distribution, instead of uniform temperature. Through this comprehensive understanding the temperature effects of the DA-CPV module, a suitable cooling system can be designed to reduce power loss.
关键词： Non-uniform illumination,Concentrator photovoltaic,Multi-physics,Dense-array,Temperature
更新于2025-09-12 10:27:22
-
Efficient Near‐Infrared Light‐Emitting Diodes based on In(Zn)As–In(Zn)P–GaP–ZnS Quantum Dots
摘要： Near-infrared (NIR) lighting plays an increasingly important role in new facial recognition technologies and eye-tracking devices, where covert and nonvisible illumination is needed. In particular, mobile or wearable gadgets that employ these technologies require electronic lighting components with ultrathin and flexible form factors that are currently unfulfilled by conventional GaAs-based diodes. Colloidal quantum dots (QDs) and emerging perovskite light-emitting diodes (LEDs) may fill this gap, but generally employ restricted heavy metals such as cadmium or lead. Here, a new NIR-emitting diode based on heavy-metal-free In(Zn)As–In(Zn)P–GaP–ZnS quantum dots is reported. The quantum dots are prepared with a giant shell structure, enabled by a continuous injection synthesis approach, and display intense photoluminescence at 850 nm with a high quantum efficiency of 75%. A postsynthetic ligand exchange to a shorter-chain 1-mercapto-6-hexanol (MCH) affords the QDs with processability in polar solvents as well as an enhanced charge-transport performance in electronic devices. Using solution-processing methods, an ITO/ZnO/PEIE/QD/Poly-TPD/MoO3/Al electroluminescent device is fabricated and a high external quantum efficiency of 4.6% and a maximum radiance of 8.2 W sr?1 m?2 are achieved. This represents a significant leap in performance for NIR devices employing a colloidal III–V semiconductor QD system, and may find significant applications in emerging consumer electronic products.
关键词： covert,light-emitting diode,illumination,electroluminescence,quantum dots,near-infrared
更新于2025-09-12 10:27:22
-
Surgical Lamp Design Based on LED Diffuse Transmission Illumination System
摘要： In this article, we have designed a surgical light lens especially for oral surgical illumination. It provides a uniform and wide field of view for illumination during oral surgery. The support system, a set of LEDs and a double free-form surface constituted the lighting system. The double free-form surface is composed of traditional free-form surface, designed total internal reflection lens and diffuse transmission plate, which improves the optical performance of the LED. When the light keeps dispersing the pupil constriction, it eventually causes our eyes to fatigue. The purpose of increasing diffuse transmission is to make the emitted light softer, thus making peoples’ eyes feel more comfortable. Based on the problems mentioned above, a numerical method is proposed as the basis for designing the double free-form surface. First, establishing a mathematical model based on the characteristics of the transmissive surface and the property of the LED. Henceforth, the nonlinear equations for the illumination distribution of the outside surface can be deduced. By solving the equation, the contour of the free-form surface is obtained. Later, we imported the contour into the 3D modeling software Solidworks to rotate so as to get the corresponding model. Finally, the simulation results suggest that the optical uniformity of the double free-form surface is able to reach as much as 86.18%.
关键词： free-form surface,uniform illumination,the total internal reflection (TIR),optical design,Diffuse transmission
更新于2025-09-12 10:27:22
-
[IEEE 2019 International Conference on 3D Vision (3DV) - Québec City, QC, Canada (2019.9.16-2019.9.19)] 2019 International Conference on 3D Vision (3DV) - Real-Time Multi-Material Reflectance Reconstruction for Large-Scale Scenes Under Uncontrolled Illumination from RGB-D Image Sequences
摘要： Real-time re?ectance reconstruction under uncontrolled illumination conditions is well-known to be a challenging task due to the complex interplay of scene geometry, surface re?ectance and illumination. Nonetheless, recent works succeed in recovering both unknown re?ectance and illumination in an uncontrolled setting. However, they are either limited regarding the scene complexity (single objects / homogeneous materials) or are not suitable for real-time applications. Our proposed method enables the recovery of heterogeneous surface re?ectance (multiple objects and spatially varying materials) in complex scenes at real-time frame rates. We achieve this goal in the following way: First, we perform a 3D scene reconstruction from an input RGB-D stream in real-time. We then use a deep learning based method to estimate Ward BRDF parameters from observations gathered from individual segmented scene objects. Subsequently we re?ne these re?ectance parameters to allow for spatial variations across the object surfaces. We evaluate our method on synthetic scenes and successfully apply it to real-world data.
关键词： deep learning,RGB-D image sequences,Ward BRDF parameters,uncontrolled illumination,Real-time re?ectance reconstruction
更新于2025-09-12 10:27:22
-
[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Review of LED drivers for Visible Light Communication
摘要： Visible Light Communication (VLC) shows up as a trend for short range wireless networks, which comes as a promising breakthrough for industry. However, this technology still faces challenges on the technical side. In particular, the selection of the appropriate circuit driver to fulfill simultaneously both lighting and communication functions is a non-trivial task. This paper reviews driver solutions intended for VLC applications, summarizing published research according to a proposed classification. Additionally, switched mode circuits stand out among the current works, supporting low data rates with higher overall efficiency at greater power levels. On the other hand, linear power amplifiers are the preferred choice for high data rate systems.
关键词： Efficiency,VLC,Visible Light Communication,LED Drivers,Illumination
更新于2025-09-12 10:27:22
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Laser Illumination Designs for Snapshot Multi-Spectral-Line Imaging
摘要： For multi-spectral imaging, both acquisition time of the spectral image set and the spectral bandwidth of each image have to be minimized. Ultimate performance can be achieved if the set of monochromatic (single-wavelength) spectral images is obtained with a single snapshot - a technique provisionally called “snapshot multi-spectral-line imaging” or SMSLI. Using contemporary RGB colour cameras, up to three spectral line images can be extracted from a snapshot image data cube at specific illumination that comprises only three spectral lines, each of them positioned within one of the detection bands (R, G or B) [1]. Techniques able to provide more spectral line images are under development, and optimal design enabling uniform illumination of target simultaneously by several laser lines is a key challenge.
关键词： multi-spectral imaging,laser illumination,SMSLI,snapshot multi-spectral-line imaging,uniform illumination
更新于2025-09-11 14:15:04