Nanopatterned sapphire substrate to enhance the efficiency of AlGaN-based UVC light source tube with CNT electron-beam

2020 ◽  
Vol 8 (48) ◽  
pp. 17336-17341
Author(s):  
Sang Kyun Shim ◽  
Wael Z. Tawfik ◽  
C. M. Manoj Kumar ◽  
Shangfeng Liu ◽  
Xinqiang Wang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Light Source ◽  
Sapphire Substrate ◽  
Water Purification ◽  
Short Wavelength ◽  
Light Sources ◽  
Ultraviolet C ◽  
Far Ultraviolet

The short wavelength of far ultraviolet C (UVC) light sources is effective for various applications that include sterilizing bacteria and viruses, water purification, and sensing.

scholarly journals Optimized Aluminum Reflector for Enhancement of UVC Cathodoluminescence Based-AlGaN Materials with Carbon Nanotube Field Emitters

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4025
Author(s):  
Manoj Kumar Chandra Mohan ◽  
Sang Kyun Shim ◽  
June Key Lee ◽  
Nakwon Jang ◽  
Naesung Lee ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Power Efficiency ◽  
Extraction Efficiency ◽  
Light Output ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Light Sources ◽  
Field Emitters ◽  
Ultraviolet C ◽  
Far Ultraviolet

The far ultraviolet C (UVC) light sources based on carbon nanotube (CNT) field emitters as excitation sources have become promising light sources for sterilization, disinfection, and water purification. However, the low light extraction efficiency of UVC–CNT light sources still hinders the practical application of these structures. Herein, we report an optimized aluminum (Al) reflector to enhance the light extraction efficiency of UVC–CNT light sources. Optical analysis of UVC-CNT light sources covered by the Al reflectors with various thicknesses ranging from 30 to 150 nm was performed to realize the optimized reflector. The UVC-CNT light sources exhibit the highest light extraction efficiency when the Al reflector layer has an optimized thickness of 100 nm. For comparison, the cathodoluminescence (CL) spectra were recorded for UVC–CNT light sources with and without the optimized Al reflector. The measured light output power and the estimated power efficiency of the UVC–CNT light-source-tube with Al reflector were enhanced by about 27 times over the reference. This enhancement is mainly attributed to the outstanding reflection effect of the Al reflector.

Organic Light Emitting Diodes - Innovative Light Sources

2019 ◽  
pp. 101-107
Author(s):  
Sergei A. Stakharny
Keyword(s):  
Light Source ◽  
Organic Light Emitting Diodes ◽  
Organic Leds ◽  
Light Sources ◽  
High Quality ◽  
Light Emitting ◽  
Organic Light ◽  
Lighting Systems ◽  
Physical Principles ◽  
Prospects Of Application

This article is a review of the new light source – organic LEDs having prospects of application in general and special lighting systems. The article describes physical principles of operation of organic LEDs, their advantages and principal differences from conventional non-organic LEDs and other light sources. Also the article devoted to contemporary achievements and prospects of development of this field in the spheres of both general and museum lighting as well as other spheres where properties of organic LEDs as high-quality light sources may be extremely useful.

Development of a UV Light Source using Pr:LuAG Thin Film Target Pumped by Electron Beam

2015 ◽  
Vol 135 (9) ◽  
pp. 1049-1054
Author(s):  
Norio Ichikawa ◽  
Kohei Ikeda ◽  
Yoshinori Honda ◽  
Hiroyuki Taketomi ◽  
Koji Kawai ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Beam ◽  
Light Source ◽  
Uv Light

scholarly journals Analysis on High-Power Seaport LED Luminaire with Uniform Light Distribution Based on Optimized Lens and Heatsink

2021 ◽  
Vol 11 (9) ◽  
pp. 4035
Author(s):  
Jinsheon Kim ◽  
Jeungmo Kang ◽  
Woojin Jang
Keyword(s):  
Light Source ◽  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Light Distribution ◽  
Light Sources ◽  
Led Light ◽  
High Power Led ◽  
Distribution Requirement ◽  
Lighting Application

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.

scholarly journals Electron-beam–ignited, high-frequency–driven vacuum ultraviolet excimer light source

2011 ◽  
Vol 94 (5) ◽  
pp. 53001 ◽  
Author(s):  
T. Dandl ◽  
H. Hagn ◽  
T. Heindl ◽  
R. Krücken ◽  
J. Wieser ◽  
...  
Keyword(s):  
Electron Beam ◽  
Light Source ◽  
High Frequency ◽  
Vacuum Ultraviolet ◽  
Excimer Light Source

scholarly journals Minimal, superficial DNA damage in human skin from filtered far‐ultraviolet‐C (UV‐C)

2021 ◽  
Author(s):  
R.P. Hickerson ◽  
M.J. Conneely ◽  
S.K. Hirata Tsutsumi ◽  
K. Wood ◽  
D.N. Jackson ◽  
...  
Keyword(s):  
Dna Damage ◽  
Human Skin ◽  
Ultraviolet C ◽  
Far Ultraviolet ◽  
Uv C

scholarly journals Effect of Photofunctionalization with 6 W or 85 W UVC on the Degree of Wettability of RBM Titanium in Relation to the Irradiation Time

2021 ◽  
Vol 11 (12) ◽  
pp. 5427
Author(s):  
Arturo Sanchez-Perez ◽  
Nuria Cano-Millá ◽  
María José Moya Villaescusa ◽  
José María Montoya Carralero ◽  
Carlos Navarro Cuellar
Keyword(s):  
Light Source ◽  
Ultraviolet Light ◽  
Irradiation Time ◽  
Contact Angles ◽  
The Other ◽  
Control Group ◽  
Hydrophilic Surface ◽  
Biological Ageing ◽  
Ultraviolet C ◽  
Group A

Photoactivation with ultraviolet C light can reverse the effects derived from biological ageing by restoring a hydrophilic surface. Ten titanium discs were randomly divided into three groups: a control group, a 6 W group, and an 85 W group. A drop of double-distilled, deionized, and sterile 10 µL water was applied to each of the discs. Each disc was immediately photographed in a standardized and perpendicular manner. Measurements were taken based on the irradiation time (15, 30, 60, and 120 min). UVC irradiation improved the control values in both groups. There was no difference in its effect between the 6 W group and the other groups during the first 30 min. However, after 60 min and up to 120 min, 85 W had a significantly stronger effect. The contact angles with the 85 W ultraviolet light source at 60 and 120 min were 19.43° and 31.41°, respectively, whereas the contact angles for the 6 W UVC source were 73.8° and 61.45°. Power proved to be the most important factor, and the best hydrophilicity result was obtained with a power of 85 W for 60 min at a wavelength of 254 nm.

Electron-beam-pumped light sources using graphite nanoneedle field emitters and Si electron-transparent films

2007 ◽  
Vol 2 (3) ◽  
pp. 272-277
Author(s):  
Hidenori Mimura ◽  
Kazufumi Shiozawa ◽  
Yoichiro Neo ◽  
Morihiro Okada ◽  
Masafumi Takahasi ◽  
...  
Keyword(s):  
Electron Beam ◽  
Light Sources ◽  
Transparent Films ◽  
Field Emitters
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