An improved substrate structure for high angular color uniformity of white light-emitting diodes

2015 ◽  
Author(s):  
Bofeng Shang ◽  
Bin Xie ◽  
Xingjian Yu ◽  
Qi Chen ◽  
Xiaobing Luo
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Substrate Structure ◽  
Color Uniformity ◽  
White Light Emitting Diodes

High Color Uniformity of White Light-Emitting Diodes Using Chip-Scaled Package

2018 ◽  
Vol 30 (11) ◽  
pp. 989-992 ◽  
Author(s):  
Zongtao Li ◽  
Yong Tang ◽  
Jiasheng Li ◽  
Canbiao Wu ◽  
Xinrui Ding ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Uniformity ◽  
White Light Emitting Diodes

Angular color uniformity enhancement of white light-emitting diodes integrated with freeform lenses

2010 ◽  
Vol 35 (11) ◽  
pp. 1860 ◽  
Author(s):  
Kai Wang ◽  
Dan Wu ◽  
Fei Chen ◽  
Zongyuan Liu ◽  
Xiaobing Luo ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Uniformity ◽  
White Light Emitting Diodes

Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film

2016 ◽  
Vol 4 (4) ◽  
pp. 140 ◽  
Author(s):  
Shudong Yu ◽  
Zongtao Li ◽  
Guanwei Liang ◽  
Yong Tang ◽  
Binhai Yu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Uniformity ◽  
Phosphor Film ◽  
White Light Emitting Diodes

scholarly journals Improved color uniformity in white light-emitting diodes using newly developed phosphors

2018 ◽  
Vol 26 (19) ◽  
pp. 24784 ◽  
Author(s):  
Hisayoshi Daicho ◽  
Kiminori Enomoto ◽  
Hiroshi Sawa ◽  
Satoru Matsuishi ◽  
Hideo Hosono
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Uniformity ◽  
White Light Emitting Diodes

Color Uniformity Enhancement of White Light-Emitting Diodes With Novel Bell Shape Phosphor Layer

2017 ◽  
Author(s):  
Xingjian Yu ◽  
Weicheng Shu ◽  
Bofeng Shang ◽  
Bin Xie ◽  
Yanhua Cheng ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Color Temperature ◽  
Phosphor Layer ◽  
Spherical Cap ◽  
Light Emitting ◽  
Vof Model ◽  
Color Uniformity ◽  
Coating Method ◽  
White Light Emitting Diodes

In this study, we proposed a bell shape phosphor layer geometry and the corresponding dual-step phosphor coating method for enhancing the angular color uniformity (ACU) of phosphor-converted white light-emitting diodes (pcLEDs). Numerical simulation based on Volume of Fluid (VOF) model was applied to predict phosphor geometries. Based on the simulated results, experiments were conducted to realize the phosphor geometries. The simulated results show that the VOF model can predict the phosphor geometries with an acceptable geometric deviation within 5%. The experimental results show that compared with the spherical cap phosphor layer geometry, the bell shape geometry can achieve better ACU performance, an optimal bell phosphor layer geometry with equal coating volume above and around the LED chip was achieved, for the corrected color temperature (CCT) of 4000 K, the angular CCT deviation of the optimal geometry is 62 K, while it is 382 K for the spherical cap geometry.

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