scholarly journals System efficiency of laser-based white light

2014 ◽  
Vol 3 (5-6) ◽  
Author(s):  
Roland Lachmayer ◽  
Alexander Wolf ◽  
Gerolf Kloppenburg
Keyword(s):  
Thermal Management ◽  
White Light ◽  
High Power ◽  
Laser Diodes ◽  
Light Sources ◽  
System Efficiency ◽  
Light Emitting ◽  
Scale Down ◽  
Color Rendering ◽  
Product Weight

AbstractFor many lighting applications, light-emitting diodes (LEDs) are replacing traditional light sources providing the possibility for smart and efficient systems as well as a reduction in the product weight. A next step in this development is the integration of laser-based light sources to increase luminance and to further scale down the optics possibly leading to a reduction of necessary resources. This article reviews the possibilities and challenges arising from the use of laser diodes especially compared to current high-power LED systems in terms of efficiency, color-rendering properties, and thermal management.

scholarly journals Design of highly efficient phosphor-converted white light-emitting diodes with color rendering indices (R1 − R15) ≥ 95 for artificial lighting

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yong Nam Ahn ◽  
Kyu Do Kim ◽  
Gopinathan Anoop ◽  
Gab Soo Kim ◽  
Jae Soo Yoo
Keyword(s):  
Light Source ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Sources ◽  
High Definition ◽  
Light Emitting ◽  
Artificial Lighting ◽  
Red Phosphors ◽  
White Light Emitting Diodes ◽  
Color Rendering

AbstractPhosphor-converted white light-emitting diodes (pc-WLEDs) are excellent energy-efficient light sources for artificial lighting applications. One goal of artificial lighting is to make objects/images look natural – as they look under the sunlight. The ability of a light source to accurately render the natural color of an object is gauged by the parameter – color rendering index (CRI). A conventional pc-WLED has an average CRI ~ 80, which is very low for accurate color reproduction. To utilize the pc-WLEDs for artificial lighting applications, all the CRI points (R1 – R15) should be above 95. However, there is a trade-off between CRI and luminous efficacy (LER), and it is challenging to increase both CRI and LER. Herein we propose a novel LED package (PKG) design to achieve CRI points ≥95 and efficiency ~100 lm/W by introducing two blue LEDs and a UV LED in combination with green and red phosphors. The silicone encapsulant, the current through the LEDs, and the green/red phosphor ratio were optimized for achieving high CRI and LER. Our re-designed LED PKG will find applications in stadium lighting as well as for ultra-high-definition television production where high CRI points are required for the artificial light source.

Effect of phosphor geometry on the luminous efficiency of high-power white light-emitting diodes with excellent color rendering property

2008 ◽  
Vol 34 (1) ◽  
pp. 1 ◽  
Author(s):  
Yu-Ho Won ◽  
Ho Seong Jang ◽  
Kyoung Woo Cho ◽  
Yong Seon Song ◽  
Duk Young Jeon ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Excellent Color

Glass-ceramic composites for high-power white-light-emitting diodes

2021 ◽  
Author(s):  
Alessandro Longato ◽  
Sebastiano Picco ◽  
Lorenzo Moro ◽  
Matteo Buffolo ◽  
Carlo De Santi ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Glass Ceramic ◽  
Light Emitting Diodes ◽  
Ceramic Composites ◽  
Light Emitting ◽  
White Light Emitting Diodes

53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White‐Light‐Emitting Diodes

2017 ◽  
Vol 29 (37) ◽  
pp. 1702910 ◽  
Author(s):  
Zifei Wang ◽  
Fanglong Yuan ◽  
Xiaohong Li ◽  
Yunchao Li ◽  
Haizheng Zhong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Color Rendering
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