Optimization of a UV light-emitting diode based fluorescence-phase sensor

2006 ◽  
Author(s):  
A. Žukauskas ◽  
N. Kurilčik ◽  
P. Vitta ◽  
S. Juršėnas ◽  
E. Bakienė ◽  
...  
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Phase Sensor

scholarly journals Suppression of “volcano” morphology and parasitic defect luminescence in AlGaN-based deep-UV light-emitting diode epitaxy

2019 ◽  
Vol 13 ◽  
pp. 102285 ◽  
Author(s):  
Chia-Yen Huang ◽  
Tsung-Yen Liu ◽  
Shih-Ming Huang ◽  
Kai-Hsiang Chang ◽  
Tsu-Ying Tai ◽  
...  
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Deep Uv ◽  
Defect Luminescence

scholarly journals Chromaticity Study of Curcumin Dye Extracted from Curcuma longa L. Using for UV Light down Conversion for White Light Emitting Diode

2019 ◽  
Vol 290 ◽  
pp. 183-189
Author(s):  
Mahmood Al Shafouri ◽  
Naser Mahmoud Ahmed ◽  
Zainuriah Hassan ◽  
Munirah Abdullah Almessiere
Keyword(s):  
White Light ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Curcuma Longa ◽  
Color Temperature ◽  
Light Emitting ◽  
Chromaticity Coordinates ◽  
Major Factors ◽  
Color Rendering ◽  
Down Conversion

In thus study, Turmeric phosphor dye was extracted from Curcuma Longa L. via a simple technique using silica gel. The phosphor was used for light down-conversion of UV light for the manufacture white light emitting diode (WLED). The UV-LED was analyzed over 395nm wavelengths. The characteristics of the white light chromaticity were controlled by tuning the current and phosphor concentration. An optimum color rendering index (CRI) value of 63.4 was obtained. The chromaticity coordinates (CIE) and correlated color temperature (CCT) were measured for various currents and phosphor concentrations. The white phosphor exhibited CIE value of 0.355,0.338 and CCT of 4567 K. The concentration of phosphor and amount of applied current were confirmed to be major factors that control the intensity of white light emitted from the sample, where CIE and CRI of the emitted light steadily increased with the concentration of phosphor and current. Thus, phosphor concentration has a critical effect on conversion efficiency. Key words: Turmeric, phosphor, WLED, curcumin

scholarly journals High Sensitivity of NO Gas Sensors Based on Novel Ag-Doped ZnO Nanoflowers Enhanced with a UV Light-Emitting Diode

ACS Omega ◽  
2018 ◽  
Vol 3 (10) ◽  
pp. 13798-13807 ◽  
Author(s):  
You-Ting Tsai ◽  
Shoou-Jinn Chang ◽  
Liang-Wen Ji ◽  
Yu-Jen Hsiao ◽  
I-Tseng Tang ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Uv Light ◽  
Light Emitting Diode ◽  
High Sensitivity ◽  
Light Emitting ◽  
Doped Zno

scholarly journals Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 735 ◽  
Author(s):  
Taiping Xie ◽  
Jiao Hu ◽  
Jun Yang ◽  
Chenglun Liu ◽  
Longjun Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electron Microscope ◽  
Visible Light ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Active Species ◽  
Composite Catalyst ◽  
Light Emitting ◽  
Transmission Electron ◽  
Visible Light Driven

Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using a vibration sample magnetometer (VSM). The as-produced composite with an irregular flaky-shaped aggregate possesses a good anti-demagnetization ability (Hc = 861.04 G) and a high photocatalytic efficiency. Under visible light (λ > 420 nm) and UV light-emitting diode (LED) irradiation, the photodegradation rates of Rhodamine B (RhB) using BiOBr/SrFe12O19 (5 wt %) (BOB/SFO-5) after 30 min of reaction were 97% and 98%, respectively, which were higher than that using BiOBr (87%). The degradation rate of RhB using the recovered BiOBr/5 wt % SrFe12O19 (marked as BOB/SFO-5) was still more than 85% in the fifth cycle, indicating the high stability of the composite catalyst. Meanwhile, after five cycles, the magnetic properties were still as stable as before. The radical-capture experiments proved that superoxide radicals and holes were main active species in the photocatalytic degradation of RhB.

High-Power UV-Light-Emitting Diode on Sapphire

2003 ◽  
Vol 42 (Part 1, No. 2A) ◽  
pp. 400-403 ◽  
Author(s):  
Motoaki Iwaya ◽  
Shun Takanami ◽  
Atsushi Miyazaki ◽  
Yasuhiro Watanabe ◽  
Satoshi Kamiyama ◽  
...  
Keyword(s):  
High Power ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Light Emitting

Full-Color Fluorescent Display Devices Using a Near-UV Light-Emitting Diode

1996 ◽  
Vol 35 (Part 2, No. 7A) ◽  
pp. L838-L839 ◽  
Author(s):  
Yuichi Sato ◽  
Nobuyuki Takahashi ◽  
Susumu Sato
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Display Devices ◽  
Full Color

Instense Red Phosphors for UV Light Emitting Diode Devices

2010 ◽  
Vol 10 (3) ◽  
pp. 2060-2064 ◽  
Author(s):  
Fa-Bin Cao ◽  
Yan-Wen Tian ◽  
Yong-Jie Chen ◽  
Lin-Jiu Xiao ◽  
Yun-Yi Liu
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Red Phosphors

A Single-Phase Full-Color Ca4Si2O7F2:Ce3+, Tb3+, Sm3+ Micron Belt Mat for White-Light Emitting Diode Application

2016 ◽  
Vol 697 ◽  
pp. 727-732 ◽  
Author(s):  
Bo Cui ◽  
Qing Hong Zhang ◽  
Hong Zhi Wang ◽  
Yao Gang Li
Keyword(s):  
Heat Treatment ◽  
White Light ◽  
Single Phase ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Electrospinning Process ◽  
Light Emitting ◽  
Full Color ◽  
Color Tunable ◽  
White Light Emitting Diodes

A new kind of Ca4Si2O7F2:Ce3+, Tb3+, Sm3+ oxyfluoride phosphor micron belt mat was obatained by simply electrospinning process and subsequent heat treatment. XRD result shows that a pure Ca4Si2O7F2 phase can be obtained at low temperature of around 900 °C. The micron belt precursor has a smooth surface and uniform morphology, and the width and thickness of the belt is about 2 μm and 200 nm. The morphology of micron belt is well retained after heat treatment, forming a plat phosphor mat consisting of uniform micron belt network. Ca4Si2O7F2:Ce3+, Ca4Si2O7F2:Tb3+, and Ca4Si2O7F2:Sm3+ exhibit the characteristic emissions of Ce3+ (4f7→4f65d1, blue), Tb3+ (4f8→4f75d, green), and Sm3+ (4f6→4f65d, red) under the excitation of near-UV light, respectively. By adjusting the doping concentration of Ce3+, Tb3+, Sm3+ ions a white emission in a single phase was obtained under the excitation of 360 nm. We have demonstrated that Ca4Si2O7F2:Ce3+, Tb3+, Sm3+ phosphor mat can be a promising candidate for a color-tunable phosphor mat applied in a near-UV White light emitting diodes.

Biosensor for L-phenylalanine based on the optical detection of NADH using a UV light emitting diode

2011 ◽  
Vol 173 (1-2) ◽  
pp. 199-205 ◽  
Author(s):  
Takahiro Arakawa ◽  
Tomoyuki Koshida ◽  
Tomoko Gessei ◽  
Kumiko Miyajima ◽  
Daishi Takahashi ◽  
...  
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Optical Detection ◽  
Light Emitting
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