Color-converting bilayered composite plate of quantum-dot–polymer for high-color rendering white light-emitting diode

2013 ◽  
Vol 38 (15) ◽  
pp. 2885 ◽  
Author(s):  
Jong-Hoon Kim ◽  
Woo-Seuk Song ◽  
Heesun Yang
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Composite Plate ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Color Rendering

Utilization of LiSrPO4:Eu phosphor and CuInS quantum dot for fabrication of high color rendering white light-emitting diode

2013 ◽  
Vol 92 ◽  
pp. 325-329 ◽  
Author(s):  
Woo-Seuk Song ◽  
Jong-Hoon Kim ◽  
Jeong-Hoon Lee ◽  
Hye-Seung Lee ◽  
Ho Seong Jang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Color Rendering

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

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