Article
Engineering, Electrical & Electronic
Shuang Li, Jinglong Liu, Lu Ding, Jiaxin Liu, Jian Xu, Yang Peng, Mingxiang Chen
Summary: In this work, a chip-on-thermoelectric cooler (TEC) for the thermal management of high-power LEDs was proposed and demonstrated to effectively reduce working temperature and increase light output power. The chip-on-TEC structure, utilizing the Peltier effect and low thermal resistance, improved LED performance significantly in thermal simulation and packaging experiments.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Nanoscience & Nanotechnology
Aditya S. Dutt, Kangfa Deng, Guodong Li, Nithin B. Pulumati, David Alberto Lara Ramos, Vida Barati, Javier Garcia, Nicolas Perez, Kornelius Nielsch, Gabi Schierning, Heiko Reith
Summary: In this work, mu TEDs with high net cooling temperature are fabricated by optimizing the contact resistance and device design combined with a novel packaging technique that is fully compatible with on-chip integration. The devices achieve a high net cooling temperature of 10.8 K without packaging and 9.6 K with packaging at room temperature, with an extremely high reliability of over 85 million cooling cycles.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Agricultural Engineering
Xiuye Wei, Xinlin Zhao, Songhua Long, Qingmei Xiao, Yuan Guo, Caisheng Qiu, Huajiao Qiu, Yufu Wang
Summary: This study investigated the effects of different LED light qualities on the growth and cannabinoid synthesis of hemp. Results showed that LED2 and LED5 could effectively promote hemp growth and increase CBD content. LED2 and LED5 may be good choices for indoor farming of hemp targeted for higher CBD yield.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Thermodynamics
Gokhan Sevilgen, Muhsin Kilic, Mehmet Aktas
Summary: This paper conducted thermal and hydraulic analysis of a dual-separated cooling channel for automotive lighting systems, comparing theoretical and simulation results to find that using the dual-separated cooling channel can increase light output by about 10% and reduce junction temperature, resulting in improved operating efficiency.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Physics, Applied
Wai Yuen Fu, Hoi Wai Choi
Summary: A light-emitting bipolar transistor (LEBJT) has been developed by utilizing the existing LED structure to construct a PNP bipolar junction transistor, eliminating the need for customized structures or epitaxial regrowth. Two designs of GaN LEBJT were demonstrated, with one featuring a larger emitter area for electronic-optical signal conversion and another with a reduced emitter area for increased current gain.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Thermodynamics
Giovanni Pennelli, Elisabetta Dimaggio, Massimo Macucci
Summary: Thermoelectric generator devices have great potential for energy scavenging and green energy harvesting. Researchers proposed a straightforward approach using an equivalent electric circuit model to support the design and optimization of thermoelectric systems, considering both thermal and electrical issues.
Article
Thermodynamics
Ryszard Buchalik, Grzegorz Nowak, Iwona Nowak
Summary: The paper focuses on simulating the transient states of thermoelectrically equipped systems. An analytical description of the system is provided considering thermal resistance and thermal capacity. The developed software is validated through experimental tests, and the results show how the performance of thermoelectric processes can be influenced by parameters like supply current and leg height.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Min Joo Park, Abu Bashar Mohammad Hamidul Islam, Yu-Jung Cha, Joon Seop Kwak
Summary: This study fabricated a-plane nanopillar LED based on nonpolar InGaN/GaN single quantum-well using a top-down fabrication method, with self-aligned In3Sn nanodots as etching masks. The fabricated nanopillars showed high yield and a large height-to-diameter aspect ratio as observed by scanning electron microscopy characteristics. The size of the nanopillars depended on the size of In3Sn nanodots, which were fabricated from ITO thin film using a 3% HCl solution.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Analytical
Demetrio Iero, Massimo Merenda, Riccardo Carotenuto, Giovanni Pangallo, Sandro Rao, Gheorghe Brezeanu, Francesco G. Della Corte
Summary: A novel method based on tracking LED forward voltage drop with temperature variation effectively reduces measurement error and limits the impact of sample heterogeneity on results.
Review
Crystallography
Kengo Nagata, Taichi Matsubara, Yoshiki Saito, Keita Kataoka, Tetsuo Narita, Kayo Horibuchi, Maki Kushimoto, Shigekazu Tomai, Satoshi Katsumata, Yoshio Honda, Tetsuya Takeuchi, Hiroshi Amano
Summary: A transparent AlGaN homoepitaxial tunnel junction (TJ) was developed as the anode of a deep-UV LED to increase its light output power. The AlGaN TJ LED achieved an operating voltage of 10.8 V and an output power of 57.3 mW, which were among the lowest and highest values, respectively, compared to devices using conventional electrodes. The combination of the AlGaN-based TJ and MgZnO/Al reflective contact showed promise in further improving the light output power.
Article
Chemistry, Physical
Junseok Jeong, Dae Kwon Jin, Joonghoon Choi, Junho Jang, Bong Kyun Kang, Qingxiao Wang, Won Il Park, Mun Seok Jeong, Byeong-Soo Bae, Woo Seok Yang, Moon J. Kim, Young Joon Hong
Summary: Remote epitaxy of GaN p-n homojunction microcrystals has been demonstrated for fabricating transferable, flexible white light-emitting diodes (WLEDs). The WLEDs show reliable performance even after repetitive bending and cycling temperature environments, making them suitable for flexible and modular light panels.
Article
Physics, Applied
Ziqian Qi, Linning Wang, Yingze Liang, Pengzhan Liu, Hongbo Zhu, Yongjin Wang
Summary: This article introduces a solar-blind full-duplex light communication system using 275-nm DUV LEDs, which eliminates electromagnetic interference and solar noise. The system allows a maximum communication distance of 7 meters and supports real-time video and file sharing.
APPLIED PHYSICS LETTERS
(2023)
Article
Environmental Sciences
Vivek Patel, Lav Kumar Kaushik, Yogeshkumar Devjibhai Khimsuriya, Pranav Mehta, Abd Elnaby Kabeel
Summary: The study investigates the performance of a solar desalination system with glass reflectors, heat storage media, and a thermoelectric cooling system. The modified system shows a 1.23 times increase in freshwater production and a 23.73% improvement in energy efficiency compared to the conventional setup. The results suggest that this type of system is feasible for implementation in harsh and coastal areas, but further field studies are needed to fully realize its potential.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Wenqing Niu, Zengyi Xu, Weihuang Xiao, Yu Liu, Fangchen Hu, Guangxu Wang, Jianli Zhang, Zhixue He, Shaohua Yu, Jianyang Shi, Nan Chi
Summary: This paper introduces a VLC system based on LEDs, which can provide both illumination and wireless communication simultaneously. By utilizing specific LEDs and a precoding scheme, the experimental results show that the system has good interference cancellation performance and high data transmission rate.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Energy & Fuels
Haowen Liu, Xudong Zhao, Guiqiang Li, Xiaoli Ma
Summary: This study investigated a novel separated micro-thermoelectric cooler configuration with connecting wire to increase the distance between the hot and cold sides. Results showed a reduction in maximum COP, but a significant increase in distance between the sides. Cooling capacity decreased less than COP loss due to the connecting wire.