Results 41 to 50 of about 4,806,914 (197)

Optimising metameric spectra for integrative lighting to modulate the circadian system without affecting visual appearance

Scientific Reports, 2021
Smart integrative lighting systems aim to support human health and wellbeing by capitalising on the light-induced effects on circadian rhythms, sleep, and cognitive functions, while optimising the light’s visual aspects like colour fidelity, visual ...
Babak Zandi, Oliver Stefani, Alexander Herzog, Luc J. M. Schlangen, Quang Vinh Trinh, Tran Quoc Khanh   +5 more
doaj   +1 more source

Improved Characteristics of AlGaN-Based Deep Ultraviolet Light-Emitting Diodes with Superlattice p-Type Doping

IEEE Photonics Journal, 2017
The photoelectric properties and physical mechanism of AlGaN-based deep ultraviolet light emitting diodes (DUV-LEDs) with the superlattice p-type doping layer (PSL) are studied numerically and compared with the Al-composition (50%) conventional p ...
Qianying Si, Hangyang Chen, Shuping Li, Shiqiang Lu, Junyong Kang   +4 more
doaj   +1 more source

Quasi‐2D Growth of Aluminum Nitride Film on Graphene for Boosting Deep Ultraviolet Light‐Emitting Diodes

Advanced Science, 2020
Efficient and low‐cost production of high‐quality aluminum nitride (AlN) films during heteroepitaxy is the key for the development of deep ultraviolet light‐emitting diodes (DUV‐LEDs).
Hongliang Chang, Zhaolong Chen, Bingyao Liu, Shenyuan Yang, Dongdong Liang, Zhipeng Dou, Yonghui Zhang, Jianchang Yan, Zhiqiang Liu, Zihui Zhang, Junxi Wang, Jinmin Li, Zhongfan Liu, Peng Gao, Tongbo Wei   +14 more
doaj   +1 more source

Efficacy of 265-nm ultraviolet light in inactivating infectious SARS-CoV-2

Journal of Photochemistry and Photobiology, 2021
Although, Low-pressure (LP) mercury lamps that emit wavelengths of around 254 nm have been widely applied as ultraviolet (UV) light devices for decontamination of microorganisms, they have raised environmental concerns due to their mercury content ...
Hiroshi Shimoda, Junji Matsuda, Tatsuyuki Iwasaki, Daisuke Hayasaka   +3 more
doaj   +1 more source

Rapid inactivation of SARS-CoV-2 with deep-UV LED irradiation

Emerging Microbes and Infections, 2020
The spread of novel coronavirus disease 2019 (COVID-19) infections worldwide has raised concerns about the prevention and control of SARS-CoV-2. Devices that rapidly inactivate viruses can reduce the chance of infection through aerosols and contact ...
Hiroko Inagaki, Akatsuki Saito, Hironobu Sugiyama, Tamaki Okabayashi, Shouichi Fujimoto   +4 more
doaj   +1 more source

High-Efficiency and High-Reliability Deep-UV Light-Emitting Diodes Using Transparent Ni-Implanted AlN Ohmic Electrodes

IEEE Access, 2021
Significant efforts have been devoted to improve the external quantum efficiency (EQE) of AlGaN-based top-emitting deep-UV light-emitting diodes (DUV LEDs).
Tae Hoon Park, Kyung Rock Son, Hideki Hirayama, Tae Geun Kim   +3 more
doaj   +1 more source

Simulation and theoretical study of AlGaN-based deep-ultraviolet light-emitting diodes with a stepped electron barrier layer

AIP Advances, 2022
Owing to the COVID-19 outbreak, sterilization of deep-ultraviolet light-emitting diodes (DUV LEDs) has attracted increasing attention. Effectively improving the radiative recombination efficiency and mitigating the efficiency degradation, mainly caused ...
Fengyi Zhao, Wei Jia, Hailiang Dong, Zhigang Jia, Tianbao Li, Chunyan Yu, Zhuxia Zhang, Bingshe Xu   +7 more
doaj   +1 more source

Enhancing Both TM- and TE-Polarized Light Extraction Efficiency of AlGaN-Based Deep Ultraviolet Light-Emitting Diode via Air Cavity Extractor With Vertical Sidewall

IEEE Photonics Journal, 2018
In this work, we investigate the effect of sidewall angle, height and space of an air cavity extractor (AC-Extractor) on the polarization-dependent light extraction efficiency (LEE) for AlGaN-based deep-ultraviolet light-emitting diodes (DUV LEDs) using ...
Yonghui Zhang, Yuxin Zheng, Ruilin Meng, Ce Sun, Kangkai Tian, Chong Geng, Zi-Hui Zhang, Guoxu Liu, Wengang Bi   +8 more
doaj   +1 more source

On the Impact of Electron Leakage on the Efficiency Droop for AlGaN Based Deep Ultraviolet Light Emitting Diodes

IEEE Photonics Journal, 2020
In this work, we have investigated the origin of efficiency droop for AlGaN-based deep ultraviolet light-emitting diodes (DUV LEDs). We find that the efficiency droop is likely to be caused by the electron leakage for DUV LEDs studied in this work.
Chunshuang Chu, Kangkai Tian, Jiamang Che, Hua Shao, Jianquan Kou, Yonghui Zhang, Zi-Hui Zhang, Hao-Chung Kuo   +7 more
doaj   +1 more source

Enhanced Light Extraction Efficiency and Modulation Bandwidth of Deep-Ultraviolet Light-Emitting Diodes with Al Nanospheres

Crystals, 2022
Planar, nanopillar and Al nanosphere structure AlGaN-based deep-ultraviolet light-emitting diodes (DUV-LEDs) were numerically investigated via a three-dimensional finite difference time domain (3D FDTD) method.
Xiaolong Hu, Xu Liang, Lingyun Tang, Wenjie Liu   +3 more
doaj   +1 more source