scholarly journals Color Temperature Tunable White-Light LED Cluster with Extrahigh Color Rendering Index

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Minhao Zhang ◽  
Yu Chen ◽  
Guoxing He
Keyword(s):  
White Light ◽  
Experimental Results ◽  
Color Temperature ◽  
Blue Led ◽  
Average Value ◽  
Red Led ◽  
Green Led ◽  
Color Rendering Index ◽  
Color Rendering

The correlated color temperature (CCT) tunable white-light LED cluster with extrahigh color rendering property has been found by simulation and fabricated, which consists of three WW LEDs (CCT = 3183 K), one red LED (634.1 nm), one green LED (513.9 nm), and one blue LED (456.2 nm). The experimental results show that this cluster can realize the CCT tunable white-lights with a color rendering index (CRI) above 93, special CRI R9 for strong red above 90, average value of the special CRIs of R9 to R12 for the four saturated colors (red, yellow, green, and blue) above 83, and luminous efficacies above 70 lm/W at CCTs of 2719 K to 6497 K.

High color rendering index single phase white light emitting phosphors based on Tb3+/Sm3+ co-doped CePO4 nanocrystals: the role of Tb3+ as a bridge between Ce3+ and Sm3+

2019 ◽  
Vol 43 (44) ◽  
pp. 17367-17382 ◽  
Author(s):  
Sisira S. ◽  
Linju Ann Jacob ◽  
Kamal P. Mani ◽  
Biju P. R. ◽  
N. V. Unnikrishnan ◽  
...  
Keyword(s):  
White Light ◽  
Single Phase ◽  
Color Temperature ◽  
Light Emitting ◽  
Chromaticity Coordinates ◽  
Color Rendering Index ◽  
Cie Chromaticity ◽  
Color Rendering

Single phase white light emitting CePO4 nanocrystals doped with Tb3+ and Sm3+ were synthesized. The quality of white light is characterized by CIE chromaticity coordinates, color temperature, color rendering index and quantum yield.

Mn2+and Mn4+red phosphors: synthesis, luminescence and applications in WLEDs. A review

2018 ◽  
Vol 6 (11) ◽  
pp. 2652-2671 ◽  
Author(s):  
Qiang Zhou ◽  
Leonid Dolgov ◽  
Alok M. Srivastava ◽  
Lei Zhou ◽  
Zhengliang Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
White Light ◽  
Light Emitting Diodes ◽  
Color Temperature ◽  
Luminescent Materials ◽  
Light Emitting ◽  
Red Phosphors ◽  
Important Family ◽  
Color Rendering Index ◽  
Color Rendering

Transition-metal activated phosphors are an important family of luminescent materials that can produce white light with an outstanding color rendering index and correlated color temperature for use in light-emitting diodes.

The Optimal Design of Multi-Chip White-Light LEDs for Color Uniformity

2013 ◽  
Vol 415 ◽  
pp. 465-472
Author(s):  
Chiu Jung Yang ◽  
Chien Sheng Huang ◽  
Ji Nan Jeng ◽  
Po Wen Chen
Keyword(s):  
Monte Carlo ◽  
Optimal Design ◽  
Ray Tracing ◽  
White Light ◽  
Experimental Results ◽  
Commercial Software ◽  
Color Uniformity ◽  
Color Rendering Index ◽  
Color Rendering ◽  
Light Modeling

A multi-chip white-light modeling algorithm for high color rendering index and high color uniformity of surface mounted LED devices is demonstrated. The simulation of white-light LED model, according to the principle of additive color mixture by four color of red, amber, green, blue LEDs and using the commercial software program to perform Monte Carlo ray tracing has been developed. The simulation and experimental results show that the performance can be achieved with a number of LED chips.

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