An End-Type Fiber-Optic UV Sensor Covered with Mixture of Two UV Sensitive Materials

2013 ◽  
Vol 543 ◽  
pp. 265-268
Author(s):  
Ana V. Joža ◽  
Dragan Z. Stupar ◽  
Jovan S. Bajić ◽  
Bojan M. Dakić ◽  
Zoran Mijatović ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Uv Light ◽  
Visible Spectrum ◽  
Light Sources ◽  
Solar Simulator ◽  
Uv Sensor ◽  
Sensor Configuration ◽  
Uv Lamp ◽  
Hot Melt ◽  
Type Fiber

An end-type fiber-optic UV sensor based on the principle of fluorescence is proposed and demonstrated. The sensor is made of large-core plastic optical fiber with one end covered with mixture of hot melt adhesive and small amount of chlorophyll. As sources of ultraviolet radiation solar simulator and UV lamp are used. Spectra on the sensor output are measured with spectrometer and compared for different UV light sources. Both hot melt adhesive and chlorophyll reacted to UV radiation. The peaks of fluorescent emission are obtained in visible spectrum in range of blue wavelengths (for hot melt adhesive) and in range of red wavelengths (for chlorophyll), which makes this sensor configuration a good solution for signal multiplexing.

scholarly journals TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light

2020 ◽  
Author(s):  
Naoyuki Harada ◽  
Yoichi Sasaki ◽  
Masanori Hosoyamada ◽  
Nobuo Kimizuka ◽  
Nobuhiro Yanai
Keyword(s):  
High Performance ◽  
Uv Light ◽  
Light Sources ◽  
Solar Simulator ◽  
Visible Absorption ◽  
Excitation Light ◽  
Uv Emission ◽  
Threshold Excitation ◽  
Weak Light ◽  
Optimized Conditions

Until now, the efficiency of triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to ultraviolet (UV) light has been limited to ca. 10% due to the absence of high-performance acceptors (emitters). Here, we present the first example of visible-to-UV TTA-UC internal efficiency <i>η</i><sub>UC</sub> beyond 20% by developing a novel UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph), and sensitizing its triplet by a donor Ir(C6)<sub>2</sub>(acac) with strong visible absorption and weak UV absorption. Under optimized conditions, 97% of the excitation light is absorbed, the threshold excitation intensity (<i>I</i><sub>th</sub> = 1.1 mW cm<sup>−2</sup>) is lower than the solar irradiance (1.4 mW cm<sup>−2</sup> for 445 ± 5 nm), and significantly, the highest external UC efficiency <i>η</i><sub>UC,ext</sub> of 17.4% for vis-to-UV TTA-UC is achieved. Upconverted UV emission can also be obtained with weak light sources such as an AM 1.5 solar simulator and room LEDs, paving the way for a variety of solar and indoor applications.

scholarly journals TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light

2020 ◽  
Author(s):  
Naoyuki Harada ◽  
Yoichi Sasaki ◽  
Masanori Hosoyamada ◽  
Nobuo Kimizuka ◽  
Nobuhiro Yanai
Keyword(s):  
High Performance ◽  
Uv Light ◽  
Light Sources ◽  
Solar Simulator ◽  
Visible Absorption ◽  
Excitation Light ◽  
Uv Emission ◽  
Threshold Excitation ◽  
Weak Light ◽  
Optimized Conditions

Until now, the efficiency of triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to ultraviolet (UV) light has been limited to ca. 10% due to the absence of high-performance acceptors (emitters). Here, we present the first example of visible-to-UV TTA-UC internal efficiency <i>η</i><sub>UC</sub> beyond 20% by developing a novel UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph), and sensitizing its triplet by a donor Ir(C6)<sub>2</sub>(acac) with strong visible absorption and weak UV absorption. Under optimized conditions, 97% of the excitation light is absorbed, the threshold excitation intensity (<i>I</i><sub>th</sub> = 1.1 mW cm<sup>−2</sup>) is lower than the solar irradiance (1.4 mW cm<sup>−2</sup> for 445 ± 5 nm), and significantly, the highest external UC efficiency <i>η</i><sub>UC,ext</sub> of 17.4% for vis-to-UV TTA-UC is achieved. Upconverted UV emission can also be obtained with weak light sources such as an AM 1.5 solar simulator and room LEDs, paving the way for a variety of solar and indoor applications.

Accessible, large-area, uniform dose photolithography using a moving light source

2021 ◽  
Author(s):  
Alexander Kaltashov ◽  
Prabu Karthick Parameshwar ◽  
Nicholas Lin ◽  
Christopher Moraes
Keyword(s):  
Light Source ◽  
Uv Light ◽  
Movement Pattern ◽  
Exposure Dose ◽  
Light Sources ◽  
Large Area ◽  
Domain Specific ◽  
Conventional Photolithography ◽  
Uv Lamp ◽  
Uv Dose

Abstract Photolithography is an essential microfabrication process in which ultraviolet (UV) light is projected through a mask to selectively expose and pattern a light-sensitive photoresist. Conventional photolithography devices are based on a stationary UV lamp and require carefully-designed optics to ensure that a uniform exposure dose is provided across the substrate being patterned. Access to such systems is typically limited to certain labs with domain-specific expertise and sufficient resources. The emergence of LED-based UV technologies has provided improved access to the necessary light sources, but issues with uniformity and limited exposure sizes still remain. In this work, we explore the use of a moving light source (MOLIS) for large-area lithography applications, in which the light source path speed, elevation, and movement pattern can be used to smooth out any spatial variations in source light intensity profiles, and deliver a defined and uniform cumulative UV exposure dose to a photoresist-coated substrate. By repurposing a 3D printer and UV-LED flashlight, we constructed an inexpensive MOLIS platform, simulated and verified the parameters needed to produce a uniform UV dose exposure, and demonstrate this approach for SU-8 microfabrication of features with dimensions relevant to many areas in biomedical engineering. The ready accessibility and inexpensive nature of this approach may be of considerable value to small laboratories interested in occasional and low-throughput prototype microfabrication applications.

scholarly journals Effect of visible light sticks for collecting of adult caddisflies (Trichoptera): A preliminary field study

Zoosymposia ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 153-159
Author(s):  
GORO KIMURA ◽  
RYOICHI B. KURANISHI
Keyword(s):  
Dominant Species ◽  
Uv Light ◽  
Green Light ◽  
Visible Spectrum ◽  
Management Tool ◽  
Light Sources ◽  
Light Traps ◽  
Yellow Light ◽  
Uv Spectrum ◽  
Local Residents

Local residents along the Uji River, Kyoto, Japan, may be exposed to seasonal invasions of adult caddisflies. Ultraviolet (UV)-blocking materials are believed to be an effective pest management tool because adult caddisflies are often attracted to light sources that emit large amounts of UV light. To clarify the effect of the visible spectrum, we collected adult caddisflies using blue, green, and yellow light sticks that did not emit UV light. Traps were operated from 18:30 (sunset: 18:22) on September 2, 2016 to 06:00 (sunrise, 05:31) on September 3, 2016. We collected 382 adults representing eight species of caddisflies. Green light sticks attracted the most numerous individuals (189 adults, seven species), followed by blue (134 adults, seven species), then yellow (59 adults, five species). Paduniella tanidai Nishimoto was the dominant species (331 adults). These results suggest that adult caddisflies are attracted not only to the UV spectrum but also the visible spectrum.

Immobilization of ZnO Suspension on Glass Substrate to Remove Filtration During the Removal of Remazol Red R from Aqueous Solution

2016 ◽  
Vol 12 (6) ◽  
pp. 4127-4133
Author(s):  
Nazmul Kayes ◽  
Jalil Miah ◽  
Md. Obaidullah ◽  
Akter Hossain ◽  
Mufazzal Hossain
Keyword(s):  
Aqueous Solution ◽  
Glass Substrate ◽  
Uv Light ◽  
Aqueous Suspension ◽  
Light Irradiation ◽  
Zno Films ◽  
Light Sources ◽  
Zno Film ◽  
Semiconductor Oxides ◽  
Remazol Red

Photodegradation of textile dyes in the presence of an aqueous suspension of semiconductor oxides has been of growing interest. Although this method of destruction of dyes is efficient, the main obstacle of applying this technique in the industry is the time and cost involving separation of oxides from an aqueous suspension. In this research, an attempted was made to develop ZnO films on a glass substrate by simple immobilization method for the adsorption and photodegradation of a typical dye, Remazol Red R (RRR) from aqueous solution. Adsorption and photodegradation of  RRR were performed in the presence of glass supported ZnO film. Photodegradation of the dye was carried out by varying different parameters such as the catalyst dosage, initial concentrations of RRR, and light sources. The percentage of adsorption as well as photodegradation increased with the amount of ZnO, reaches a maximum and then decreased. Maximum degradation has been found under solar light irradiation as compared to UV-light irradiation. Removal efficiency was also found to be influenced by the pre-sonication of ZnO suspension.

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