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Wearable OLED device for photobiomodulation therapy 用于光生物调节治疗的可穿戴OLED器件
Pub Date : 2023-09-28 DOI: 10.1117/12.2676105
Daeyul Baek, J. Heo, Hyunra Kim, K. Kim, Dongok Han, Yongmin Jeon, Seontae Kim
Photobiomodulation therapy (PBMT), including wound healing, is the treatment that promotes biochemical reactions on the site by irradiating light to the skin. The devices using point light sources, such as light-emitting diodes (LEDs) and lasers have been used for treatment so far, but they have various disadvantages such as low flexibility, relatively heavy, and uneven effects. Recently, OLED, a next-generation light source, has the inherent advantages of uniform irradiation, flexible shape, and low heat generation, which is ideal for wearable PBMT light sources. In this paper, a wearable device using red OLED was developed, and the OLED light source observed and confirmed wound healing and inflammatory response through animal experiments and cell proliferation experiments. Our findings suggest that the OLED based this technology, which has been applied in the display, combined with the field of skin therapy may promise advances in PBMT and other medical fields.
光生物调节疗法(PBMT),包括伤口愈合,是一种通过向皮肤照射光来促进部位生化反应的治疗。迄今为止,使用点光源的设备,如发光二极管(led)和激光器进行治疗,但它们具有灵活性低,相对较重,效果不均匀等各种缺点。近年来,新一代光源OLED具有辐照均匀、形状灵活、发热量低等固有优势,是可穿戴PBMT光源的理想选择。本文开发了一种使用红色OLED的可穿戴设备,OLED光源通过动物实验和细胞增殖实验观察并证实了伤口愈合和炎症反应。我们的研究结果表明,基于该技术的OLED已经应用于显示器,结合皮肤治疗领域可能会在PBMT和其他医学领域取得进展。
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引用次数: 0
Wearable piezoelectric nanogenerator-based hazardous gas monitoring gadget for self-powered ammonia early warning 基于压电纳米发电机的可穿戴式自供电氨气预警有害气体监测装置
Pub Date : 2023-09-28 DOI: 10.1117/12.2678555
Deepak Punetha, Ajay Mahaputra Kumar, S. Chakrabarti, S. Pandey
Portable and wearable sensing devices are growing increasingly essential to people's lives as a result of the seriousness of air pollution and the rapid advancement of nanotechnology. The rGO/WO3/PVDF tertiary nanocomposite is employed as a monitoring device and boasts benefits like remarkable selectivity for ammonia hazardous gas, good responsiveness (Rg/Ra = 4.72, 50 ppm), and excellent linear sensitivity (10-500 ppm). Most crucially, the self-powered rGO/WO3/PVDF monitoring unit has a substantially quicker response/recovery time than the typical room-temperature semiconductor gas sensor. The viability of the tertiary nanocomposite for applications requiring self-powered ammonia gas sensing is demonstrated through a proof of concept demonstration.
由于空气污染的严重和纳米技术的迅速发展,便携式和可穿戴的传感设备在人们的生活中变得越来越重要。rGO/WO3/PVDF三级纳米复合材料被用作监测装置,具有对氨有害气体的显著选择性,良好的响应性(Rg/Ra = 4.72, 50 ppm)和良好的线性灵敏度(10-500 ppm)。最重要的是,自供电的rGO/WO3/PVDF监测单元比典型的室温半导体气体传感器具有更快的响应/恢复时间。三级纳米复合材料在需要自供电的氨气传感应用中的可行性通过概念验证演示得到了证明。
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引用次数: 0
Applications of carbon materials for volatile organic compound sensors 碳材料在挥发性有机化合物传感器中的应用
Pub Date : 2023-09-28 DOI: 10.1117/12.2681889
Chi-feng Lin, Chin-Chung Chen, Tzu-Yang Cheng, Yu-Hsuan Ho, Po-Wei Chi
high-sensitivity volatile organic gas sensor was fabricated with nano scale carbon black as the active material. Due to the polarity of gas molecules and the influence of surface energy, carbon black will produce different intermolecular distances after adsorbing different gases, resulted in different electron transfer ability. In addition, the conductivity of carbon black will also be changed in different oxidizing and reducing gases, coupled with the conductivity of gas molecules themselves, resulting in different electrical response of the sensor under various volatile organic gases with various concentrations.
以纳米炭黑为活性材料制备了高灵敏度挥发性有机气体传感器。由于气体分子的极性和表面能的影响,炭黑在吸附不同的气体后会产生不同的分子间距离,从而导致不同的电子传递能力。此外,炭黑的电导率在不同的氧化性和还原性气体中也会发生变化,再加上气体分子本身的电导率,导致传感器在不同浓度的各种挥发性有机气体下的电响应不同。
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引用次数: 0
Scattering-based microscope imaging of light beams in soft birefringent media with orientational fluctuations 具有方向波动的软双折射介质中光束的散射显微镜成像
Pub Date : 2022-10-03 DOI: 10.1117/12.2632215
G. Poy, S. Žumer
Thanks to their giant Kerr-like nonlinear optical response, liquid crystals support the existence of spatial optical solitons called nematicons. These solitons can be experimentally imaged in a microscope thanks to the fluctuation-induced scattering of the laser beam, but the associated microscope images are generally hard to interpret due to the incoherent nature of light scattering. In this contribution, we introduce a theoretical framework allowing to simulate microscope images originating from bulk scattering sources. We apply this framework to the visualization of bouncing solitons, and show that our framework could be the basis for a novel tomography technique of optical fields.
由于其巨大的克尔类非线性光学响应,液晶支持被称为向列子的空间光学孤子的存在。由于激光束的波动引起的散射,这些孤子可以在显微镜下实验成像,但由于光散射的非相干性,相关的显微镜图像通常难以解释。在这个贡献中,我们介绍了一个理论框架,允许模拟来自体散射源的显微镜图像。我们将该框架应用于弹跳孤子的可视化,并表明该框架可以作为一种新的光场层析成像技术的基础。
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引用次数: 0
Low-cost perovskite materials for decentralized energy generation and Department of Defense environmental impact reduction 低成本钙钛矿材料用于分散能源生产和国防部环境影响减少
Pub Date : 2022-10-03 DOI: 10.1117/12.2636636
Andre Slonopas, Lissette Rodriguez-Cabanas, C. Duong, D. Baker, V. Parameshwaran, Stanley Bradley
Metal halide perovskite solar cells (PSCs) remain one of the most discussed and researched materials in the world due to their promising materials characteristics and performance metrics. PSCs possess qualities that find applications in civilian and military sectors. PSCs have been demonstrated to have power conversion efficiencies (PCE) of over 24%, 30% reduction in deposition costs, direct band gap with tunability ranging from 1.1-1.8 eV, and the ability for synthesis at room temperature. This correspondence seeks to shed light on the current Department of Defense (DoD) efforts in PSCs, as well as demonstrate reduction in cost, environmental impact, and CO2 footprint. Successes in stabilization of the materials and challenges to be overcome for perovskites are discussed. This work shows the possibility of integrating perovskite materials with existing mature solar panel technologies for successful marketization of perovskites and diversification of applications. Furthermore, this work demonstrates the opportunities that are presented by perovskite materials to the DoD community and unique challenges that are overcome with the application of this technology.
金属卤化物钙钛矿太阳能电池(PSCs)由于其具有良好的材料特性和性能指标,一直是世界上讨论和研究最多的材料之一。psc具有在民用和军事部门应用的品质。PSCs的功率转换效率(PCE)超过24%,沉积成本降低30%,直接带隙可调范围在1.1-1.8 eV之间,并且能够在室温下合成。本文旨在阐明美国国防部(DoD)目前在psc方面的努力,并展示其在成本、环境影响和二氧化碳足迹方面的降低。讨论了钙钛矿在稳定材料方面取得的成功和需要克服的挑战。这项工作表明,钙钛矿材料与现有成熟的太阳能电池板技术相结合,可以成功实现钙钛矿的市场化和应用的多样化。此外,这项工作还展示了钙钛矿材料为国防部带来的机遇,以及该技术应用所克服的独特挑战。
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引用次数: 0
Electronic-nose for plant health monitoring in a closed environment system 用于封闭环境系统植物健康监测的电子鼻
Pub Date : 2022-10-03 DOI: 10.1117/12.2632828
A. Takshi, M. S. Hossain
With the net zero carbon emissions target by 2050, in the agricultural sector, it is essential to employ technologies to reduce the consumption of energy and resources while enhancing the yield of crops. Learning about how measurable signals can indicate the growth status of various plants will be beneficial for designing plant health monitoring systems (PHMSs) that can be used around the globe for the efficient growth of plants. In this work, we have designed and employed an array of gas sensors, acting as an electronic nose, to monitor the health status of lettuce being grown in a chamber by measuring the emission and consumption of various gases and volatile organic compounds (VOCs). While emission of ethylene is a strong indicator, we have found that accurate concentration measurements of CO2 and alcohols can also be used to assess the health status of the plant at its different stages of growth, particularly at the seedling and vegetative stages. ~20% change in the alcohol concentration and more than 2 folds increase in the equivalent CO2 level was observed when brown leaves started growing before the plant died. The results of the studies can help to design a simple PHMS that can help grow vegetables at a high yield with minimum supervision
为了实现到2050年实现净零碳排放的目标,在农业部门,必须采用技术来减少能源和资源的消耗,同时提高作物产量。了解可测量信号如何指示各种植物的生长状态将有助于设计植物健康监测系统(PHMSs),该系统可在全球范围内用于植物的有效生长。在这项工作中,我们设计并采用了一系列气体传感器,作为电子鼻,通过测量各种气体和挥发性有机化合物(VOCs)的排放和消耗来监测生菜在室内生长的健康状况。虽然乙烯的排放是一个强有力的指标,但我们发现,二氧化碳和酒精的精确浓度测量也可用于评估植物在其不同生长阶段的健康状况,特别是在幼苗和营养阶段。在植物死亡之前,当棕色叶片开始生长时,观察到酒精浓度变化约20%,等效二氧化碳浓度增加2倍以上。这些研究的结果可以帮助设计一个简单的PHMS,可以帮助在最少的监督下种植高产量的蔬菜
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引用次数: 1
Low onset stimulated emission in OLEDS oled的低起始受激辐射
Pub Date : 2022-10-03 DOI: 10.1117/12.2634247
M. Nelson
Stimulated emission is observed from OLEDS at current densities as low as 20 uA/cm2, where a high Q cavity is formed between the Ag cathode and the exit surface of the substrate. Inversion is dependent on Boltzmann population of vibrational levels serving as the ground state and this results in spectral dynamics on the time scale of thermalization of the device.
在低至20 uA/cm2的电流密度下,观察到oled的受激发射,其中Ag阴极和衬底出口表面之间形成了高Q空腔。反演依赖于作为基态的振动能级的玻尔兹曼居群,这导致了器件热化时间尺度上的光谱动力学。
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引用次数: 0
The interplay between device’s and material’s properties in determining solar cells’ performance 决定太阳能电池性能的器件和材料特性之间的相互作用
Pub Date : 2022-10-03 DOI: 10.1117/12.2637315
Sapir Bitton, Hela Fadul, Dan Liraz, N. Tessler
This contribution highlights the importance of device architecture design using a comprehensive semiconductor device model. In the context of organic PV, we show that the mobility balance is not an issue and that the only important guideline is to ensure that the lowest mobility is above 4x10-4 cm2 V-1 s-1 . With this out of the way, researchers could focus on more cost-effective challenges. In the context of perovskite cells, we show that since the presence of ions means that electrochemistry is at play, the traditional semiconductor device models that exclude electrochemistry are incomplete.
这一贡献强调了使用全面的半导体器件模型进行器件体系结构设计的重要性。在有机光伏的背景下,我们表明迁移率平衡不是问题,唯一重要的指导方针是确保最低迁移率高于4x10-4 cm2 V-1 s-1。有了这个,研究人员可以专注于更具成本效益的挑战。在钙钛矿电池的背景下,我们表明,由于离子的存在意味着电化学在起作用,排除电化学的传统半导体器件模型是不完整的。
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引用次数: 1
Synthesis and optical study of highly stable double perovskite Cs2CuBiCl6 for optoelectronic applications 光电用高稳定双钙钛矿Cs2CuBiCl6的合成与光学研究
Pub Date : 2022-10-03 DOI: 10.1117/12.2632930
Neelu Neelu, Nivedita Pandey, S. Chakrabarti
Lead-devoid halide-based double perovskite (DP) compounds are emerging as a potential candidate to replace the highly toxic and unstable lead-based perovskite materials. Here in this work we have synthesized and characterized a novel double perovskite material Cs2CuBiCl6 for the first time through an easy and commercial chemical route at ambient temperature. Further, we have investigated the morphological and optical behavior of synthesized double perovskite material. To check the crystallinity, phase formation, and purity of the DP, X-Ray diffraction (XRD) spectroscopy has been done at room temperature. A good crystalline and rhombohedral phase has been observed from the XRD plot, which is in good agreement with the reference data (ISCD#239874). Moreover, photoluminescence (PL) spectroscopy at room temperature (300K) of synthesized DP material has been done to observe its optical properties. A broad peak around 500 nm has been observed from the PL spectra corresponding to the energy of 2.5 eV, which further suggests the usefulness of the DP for visible range applications. The observed peak in the PL spectra is due to band-to-band transition and phonon-assisted carrier recombination of the excitons trapping. This novel study on the double perovskite material Cs2CuBiCl6 has opened a new path to develop optoelectronic devices based on non-toxic double perovskite material having better efficiency than the toxic counterpart.
无铅卤化物基双钙钛矿(DP)化合物正在成为取代高毒性和不稳定的铅基钙钛矿材料的潜在候选者。在本研究中,我们首次在常温下通过简单、商业化的化学途径合成并表征了一种新型的双钙钛矿材料Cs2CuBiCl6。此外,我们还研究了合成的双钙钛矿材料的形态和光学行为。为了检查DP的结晶度、相形成和纯度,在室温下进行了x射线衍射(XRD)光谱分析。从XRD图中观察到良好的结晶和菱形相,与参考数据(ISCD#239874)吻合良好。在室温(300K)下对合成的DP材料进行了光致发光(PL)光谱分析,观察了其光学性质。从2.5 eV能量对应的PL光谱中观察到500 nm左右的宽峰,这进一步表明了DP在可见光范围应用中的实用性。在PL光谱中观察到的峰是由于带到带的跃迁和声子辅助的激子捕获的载流子重组。这项对双钙钛矿材料Cs2CuBiCl6的新研究为开发基于无毒双钙钛矿材料的光电器件开辟了一条新的途径,该材料的效率高于有毒双钙钛矿材料。
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引用次数: 0
Water-repellent highly stable host material for colour conversion layer with enhanced quantum efficiency for micro-led display applications 用于微led显示应用的具有增强量子效率的色彩转换层的防水、高稳定的主体材料
Pub Date : 2022-10-03 DOI: 10.1117/12.2632691
Ashish Gaurav, Yen-Chia Cheng, Jian-Hong Lin, Ching-Fuh Lin
Micro-LED is emerging as a potential candidate for high-end display products with attractive properties like High contrast ratio, high resolution, small pixel size, longer life, wide colour gamut, the low power consumption etc. Two dominating methods for Micro-LED fabrication are mass transfer and colour conversion. Colour conversion can be achieved by colour converting materials such as quantum dots (QDs) or light-emitting polymers. More efficiency and light intensity can be achieved using this colour conversion technique as compared to the mass transfer technique. The colour conversion technique works with a GaN-based blue colour chip and we don’t require the other two-colour diode chips which will ultimately save time and production cost by avoiding mass transfer for the fabrication of Micro-LED. In this experiment, we evaluated organic dye for red (DCJTB) and green (C545T) emitters in a water-resistant, strong binder like PVB as a host material under different solvents resulting in rare-earth element-free fluorescent films. These polymers generally contain polyols that have long chains of carbon and can be extended into the solvent easily and they act as an anchoring group. PVB being water repellent helps in moulding the film with higher efficiency (~ 90%) and enhanced stability under normal and humid conditions, resolving the issue of device degradation in the presence of water content in the case of OLED. The synthesis process is very simple, cost-effective, and non-toxic.
Micro-LED具有高对比度、高分辨率、小像素、长寿命、宽色域、低功耗等优点,正成为高端显示产品的潜在候选产品。制造微型led的两种主要方法是传质和颜色转换。颜色转换可以通过量子点(QDs)或发光聚合物等颜色转换材料来实现。与传质技术相比,使用这种颜色转换技术可以实现更高的效率和光强度。颜色转换技术与基于氮化镓的蓝色芯片一起工作,我们不需要其他双色二极管芯片,最终通过避免制造Micro-LED的传质而节省时间和生产成本。在本实验中,我们评估了红色(DCJTB)和绿色(C545T)发射体的有机染料在防水、强粘合剂(如PVB)中作为宿主材料,在不同溶剂下产生无稀土元素荧光膜。这些聚合物通常含有多元醇,这些多元醇具有长碳链,可以很容易地延伸到溶剂中,它们充当锚定基团。PVB具有拒水性,有助于在正常和潮湿条件下以更高的效率(~ 90%)塑造薄膜,并增强稳定性,解决了OLED中存在含水量时器件退化的问题。合成过程简单、经济、无毒。
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引用次数: 1
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Organic Photonics + Electronics
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