Article
Thermodynamics
Ahlem Ben Halima, Zouhour Araoud, Laurent Canale, Kamel Charrada, Georges Zissis
Summary: With LED lighting systems, 70% of the energy is lost as thermal energy. By converting this waste heat into light using Peltier modules, the efficiency of the system can be increased. This article evaluates the limitations of these solutions by examining the decrease in luminous efficiency of the LED system caused by the thermal effects of adding Peltier modules, compared to the potential gain in electrical power production.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Silvia Satorres Martinez, Diego Manuel Martinez Gila, Sergio Illana Rico, Daniel Teba Camacho
Summary: This paper presents a machine vision system for the automatic positioning of optical components in LED modules of automotive headlamps. The system has a flexible hardware-software structure that can adapt to different LED modules, and its efficiency and robustness have been evaluated through a series of tests.
Article
Agronomy
Pavel Tikhonov, Konstantin Morenko, Arseniy Sychov, Vadim Bolshev, Alexander Sokolov, Alexander Smirnov
Summary: This paper discusses the operation of an LED lighting system with a parallel power supply from photovoltaic modules and a power grid. Experimental study shows the efficient power take-off and circuit choices of the system, as well as proposing a method to simplify photovoltaic systems and reduce costs.
Article
Chemistry, Analytical
Milica Petkovic, Dragana Bajovic, Dejan Vukobratovic, Juraj Machaj, Peter Brida, Graeme McCutcheon, Lina Stankovic, Vladimir Stankovic
Summary: This paper proposes energy-efficient solutions for a smart LED lighting system, which aim to minimize energy consumption while meeting illuminance requirements in a typical office space. The solutions include dimming LED lamps, optimizing LED functionality, and reducing daylight intensity through shading windows. By implementing different optimization algorithms, the proposed optimization problems can be solved to achieve minimal energy consumption and user satisfaction.
Article
Nanoscience & Nanotechnology
Shruti Hariyani, Jakoah Brgoch
Summary: The widespread adoption of LED lighting has led to prolonged exposure to blue light, which can cause various health issues. The newly developed Na2MgPO4F:Eu2+ phosphor efficiently converts violet light to blue light, demonstrating good chromatic stability and chemical robustness, making it a promising candidate for advancing human-centric lighting.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Junji Ke, Si Huang, Zhao Yuan, Zhibin Zhao, Xiang Cui, Simon S. Ang, Zhong Chen
Summary: A low-profile and high power density packaging solution for a 62-mm 1200-V/300-A SiC power module is proposed in this article to fully utilize the advantages of SiC power devices. The design optimizations on layout, chip placement, and terminal structure are compatible with conventional module fabrication processes. The proposed module achieves a threefold increase in power density by reducing the height of the terminal connectors and demonstrating lower voltage overshoots due to low inductance in gate and power loops.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Xiulan Wu, Xinlong Zhao, Qiang Ren, Liang Du, Mengkang Pei, Ou Hai
Summary: High quality lighting is important in indoor lighting. The existing white light implementation cannot cover the entire visible light area. This study used Bi3+ as the luminescence center and designed a Bi3+-Eu3+ energy transfer system to achieve double emission of deep-blue and red in Ca2Al2SiO7: 0.06Bi3+, 0.04Eu3+. The prepared devices showed high color rendering indexes for full-spectrum white illumination.
CERAMICS INTERNATIONAL
(2023)
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Review
Plant Sciences
Alice Trivellini, Stefania Toscano, Daniela Romano, Antonio Ferrante
Summary: The flexibility of LED technology offers interesting potential for the ornamental industry, providing advantages in terms of energy efficiency, robustness, compactness, long lifetime, and low heat emission. The ability to precisely manage the light growing environment through manipulations of light quality has proven to be an effective tool for producing tailored plants according to market demand.
Article
Engineering, Electrical & Electronic
Chenming Zhong, Yijun Lu, Guolong Chen, Lihong Zhu, Ziquan Guo, Xiaofei Zhang, Zhong Chen, Weijie Guo
Summary: A sinusoidal pulsewidth modulation (SPWM) dimming scheme based on the sampling control theory is proposed, which can effectively reduce LED flicker and achieve low electromagnetic radiation interference.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Thermodynamics
Elizaveta Ya Gatapova, Gopinath Sahu, Sameer Khandekar, Run Hu
Summary: The study investigates the use of a multi jet single-phase liquid cooling system for thermal management of high-power LED luminaires, demonstrating its effectiveness in controlling temperature and maintaining safe operating conditions without compromising luminous efficiency. The experiments show that the system can keep the module surface temperature below 70 degrees Celsius and maintain safe operational temperature, even at input power levels up to 130% of the nominal design power.
APPLIED THERMAL ENGINEERING
(2021)
Article
Mathematics, Applied
K. Delendik, N. Kolyago, O. Voitik
Summary: This paper focuses on the development of a cooling system for high-power LED luminaires, utilizing mathematical optimization algorithms and numerical simulation to validate the effectiveness of a heat pipe-based system. The theoretical results were well validated by experimental data and numerical simulation, showing the potential for widespread application in the design of cooling systems for various LED products.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Materials Science, Ceramics
Yukun Li, Zhaohua Luo, Yongfu Liu, Zehua Liu, Svenja Hanson, Hui Lin, Pan Hu, Peng Sun, Jun Jiang
Summary: In the field of high-power white light LEDs/LDs, the main challenge has been obtaining phosphor-converted materials with high thermal stability and high luminous emittance with the proper blue/yellow light ratio. This study proposes the use of (CexY1-x)3(ScyAl1-y)5O12 transparent ceramics to meet this challenge. The addition of Sc3+ regulates the spectra, resulting in blue shifted emission and excitation bands, as well as narrowed full width at half maxima. The prepared Ce:YScAG transparent ceramics exhibit decent thermal quenching performance and high luminous efficiency, making them promising for future high-power LED and LD white lighting applications.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Xingjiang Liu, Chao Shen, Julian Wang
Summary: This paper investigates the thermal effects of tubular day lighting devices (TDDs) and proposes a lighting-heating coupled TDDs system with ATO nanofluids to improve energy savings and sustainability in buildings. The results show that TDDs with 100 ppm ATO nanofluids can absorb 50% solar radiation and provide efficient lighting, generating over 10 tons of domestic hot water and saving 30.9 kWh of electricity for refrigeration in a case study.
ENERGY AND BUILDINGS
(2022)
Article
Chemistry, Inorganic & Nuclear
Shruti Hariyani, Jakoah Brgoch
Summary: In the race to develop new luminescent materials, color theory and human perception should be principal factors guiding materials design; antiquated colorimetrics are still widely applied in the literature despite shortcomings; contemporary ideas in color theory are needed to accurately describe the color quality of modern LED light bulbs and flat-panel displays.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Zhiqiang Wang, Siyang Dai, Yao Zhao, Guofeng Li, Bing Ji, Volker Pickert, Bowen Gu, Shuai Ding
Summary: This paper proposes a lumped-charge model for IEGT single chip, considering the effect of carrier injection enhancement in the emitter. The parasitic inductance of the parallel branches in PP-IEGT is extracted using Ansys simulation, and the validity of Ansys simulation is verified. Furthermore, the switching inconsistency is evaluated by combining the electrical model and the effect of mutual inductance, and it is found that mutual inductance is an important factor influencing electrical parameter distribution.
MICROELECTRONICS RELIABILITY
(2024)
Article
Engineering, Electrical & Electronic
Sankha Subhra Ghosh, Surajit Chattopadhyay, Arabinda Das, Nageswara Rao Medikondu, Abdulkarem H. M. Almawgani, Adam R. H. Alhawari, Sudipta Das
Summary: This article describes a method for identifying the IGBT switch breakdown failure in a 3-phase, 3-level Voltage Source Converter linked to the photovoltaic grid. Comparative learning has been used to detect the specific parameter suitable for the detection of the failure.
MICROELECTRONICS RELIABILITY
(2024)
Article
Engineering, Electrical & Electronic
Milad Khajehvand, Henri Seppanen, Panthea Sepehrband
Summary: Using SEM/EDX analysis, microscale fracture at the bond-pad is detected during the wedge bonding process of Cu wire to a Cu or Al substrate. It is observed that the fracture of the bond leads to the formation of a bulge on the wire and a cavity in the substrate, causing fracture in the original substrate. 3D optical profiler reveals that the depth, radius, and surface area of the cavity increase with bond time for a constant bond force and power. These metrics are suggested as new factors for optimizing the wedge bonding process. The optimal bonding parameters should maximize the cavity's surface area (related to bond's pull force) while minimizing the cavity's depth relative to the substrate's thickness to avoid substrate damage. Furthermore, Molecular Dynamics simulations propose a potential plastic deformation mechanism for bond-pad damage, suggesting the benefits of using a small-grain-sized substrate, low transducer's vibration amplitude, and high transducer's frequency to minimize the cavity's depth.
MICROELECTRONICS RELIABILITY
(2024)
