Full Spectrum White LEDs of Any Color Temperature with Color Rendering Index Higher Than 90 Using a Single Broad-Band Phosphor

2017 ◽  
Vol 7 (1) ◽  
pp. R3194-R3198 ◽  
Author(s):  
Partha S. Dutta ◽  
Kathryn M. Liotta
Keyword(s):  
Broad Band ◽  
Color Temperature ◽  
Full Spectrum ◽  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

Optimizing and adjusting the photoluminescence of Mn4+-doped fluoride phosphors via forming composite particles

2019 ◽  
Vol 48 (2) ◽  
pp. 711-717 ◽  
Author(s):  
Yiwen Zhu ◽  
Shuo Yuan ◽  
Lin Huang ◽  
Yong Liu ◽  
Xinyue Li ◽  
...  
Keyword(s):  
Color Temperature ◽  
Composite Particles ◽  
White Leds ◽  
Red Phosphors ◽  
Color Rendering Index ◽  
Color Rendering

Nowadays, Mn4+-doped red phosphors are widely used in white LEDs to improve the color rendering index and decrease the correlated color temperature.

A design methodology for phosphor mixtures for tunable spectrum LEDs

MRS Advances ◽  
2016 ◽  
Vol 1 (50) ◽  
pp. 3435-3440 ◽  
Author(s):  
Partha S. Dutta ◽  
Kathryn M. Liotta
Keyword(s):  
Design Methodology ◽  
Emission Spectra ◽  
Full Spectrum ◽  
Light Emitting ◽  
White Leds ◽  
Fixed Weight ◽  
Wide Range ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

ABSTRACT Spectrum tuning in phosphor converted white light emitting diodes (pc-WLED) is done by mixing powders of phosphor compounds (with different emission wavelengths) in different weight ratios. In this paper, a new methodology for designing unique full spectrum phosphor mixtures (with fixed weight ratios of different emission phosphor) has been presented that could provide a wide range of pc-WLED spectrum. This is done by optimizing the excitation and emission spectra of the phosphor compounds used in the mixture. A unique phosphor mixture comprising of Eu2+ and Ce3+-Na1+ activated compounds of SrGa2S4, CaGa2S4, SrS, CaS and CaF2 was used to produce full spectrum warm, neutral and cool white LEDs with color temperatures between 2500 K and 7500 K and with color rendering index exceeding 95.

Enhance Color Rendering Index via Full Spectrum Employing the Important Key of Cyan Phosphor

2016 ◽  
Vol 8 (45) ◽  
pp. 30677-30682 ◽  
Author(s):  
Mu-Huai Fang ◽  
Chenchen Ni ◽  
Xuejie Zhang ◽  
Yi-Ting Tsai ◽  
Sebastian Mahlik ◽  
...  
Keyword(s):  
Full Spectrum ◽  
Color Rendering Index ◽  
Color Rendering

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from garnet-type Ca2YZr2(AlO4)3:Ce3+,Tb3+ phosphors for white LEDs with high color rendering index

2019 ◽  
Vol 7 (34) ◽  
pp. 10471-10480 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Leds ◽  
Highly Efficient ◽  
Color Rendering Index ◽  
Color Rendering

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from Ca2YZr2(AlO4)3:Ce3+,Tb3+ garnet phosphors, which showed great potential for application in warm-white LEDs with high color rendering index.

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