Simulation Study on the Improvement of Color Stability of White-light-emitting Diodes by Adopting a Remote Phosphor

2015 ◽  
Vol 65 (4) ◽  
pp. 383-388
Author(s):  
Hun Jae LEE ◽  
Min-Hyouk CHOI ◽  
Jae-Hyeon KO*
Keyword(s):  
Simulation Study ◽  
White Light ◽  
Light Emitting Diodes ◽  
Color Stability ◽  
Light Emitting ◽  
Remote Phosphor ◽  
White Light Emitting Diodes

scholarly journals (Y,Gd)BO3:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

2021 ◽  
Vol 10 (4) ◽  
pp. 1930-1935
Author(s):  
Phan Xuan Le ◽  
Le Hung Tien
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Phosphor Layer ◽  
Light Emitting ◽  
Conformal Coating ◽  
Color Quality ◽  
Remote Phosphor ◽  
White Light Emitting Diodes ◽  
Color Rendering

Among the structures using for fabricating white light-emitting diodes (WLEDs) such as the conformal coating or in-cup geometries, the remote phosphor structure gives the highest luminous efficacy. However, in terms of color quality, its performance is not as good as the others. The red-light compensation has been reported as the effective solution for enhancing the color quality of WLEDs. Hence, this study adopted the idea and applied to the dual-layer phosphor structure. The phosphor used to boost the red color in light formation is (Y,Gd)BO3:Eu particle. The dual-layer remote phosphor structure was simulated with the red (Y,Gd)BO3:Eu phosphor layer above the original yellow phosphor YAG:Ce3+ one. The WLEDs with different correlated color temperatures of 5600 K, 6600 K and 7700K were experimented. Mie-theory and Lambert-Beer law were applied to examine the results. The growth in color rendering index (CRI) and color quality scale (CQS) with the increase of (Y,Gd)BO3:Eu phosphor concentration was observed. Nevertheless, the lumen efficacy would be degraded if the concentration was over a certain number. The information provided in this article is useful for the development of high-power WLED production with greater color quality.

Self-Adaptive Conformal–Remote Phosphor Coating of Phosphor-Converted White Light Emitting Diodes

2016 ◽  
Vol 12 (9) ◽  
pp. 946-950 ◽  
Author(s):  
Caineng Li ◽  
Haibo Rao ◽  
Wei Zhang ◽  
Chunyu Zhou ◽  
Qi Zhang ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Remote Phosphor ◽  
Phosphor Coating ◽  
White Light Emitting Diodes ◽  
Self Adaptive
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