scholarly journals Tuning the correlated color temperature of white light-emitting diodes resembling Planckian locus

2018 ◽  
Vol 26 (2) ◽  
pp. A136 ◽  
Author(s):  
Ziqian He ◽  
Haiwei Chen ◽  
Yun-Han Lee ◽  
Shin-Tson Wu
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Color Temperature ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Planckian Locus

scholarly journals Widely color-temperature low-luminosity-loss electrochromic-tuned white light-emitting diodes

Optik ◽  
2020 ◽  
Vol 203 ◽  
pp. 163994
Author(s):  
Yu-Yi Kuo ◽  
Chiu-Chang Huang ◽  
Wei-Ting Chen ◽  
Ting-Hsiang Chang ◽  
Hsin-Che Lu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Color Temperature ◽  
Light Emitting ◽  
White Light Emitting Diodes

Luminescence properties of single-phase color-tunable Li4SrCa(Si2O4N8/3):Eu2+ phosphor for white light-emitting diodes

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 38731-38740 ◽  
Author(s):  
Chenxia Li ◽  
Jian Dai ◽  
Hua Yu ◽  
Degang Deng ◽  
Jun Huang ◽  
...  
Keyword(s):  
White Light ◽  
Single Phase ◽  
Light Emitting Diodes ◽  
Color Temperature ◽  
White Led ◽  
Light Emitting ◽  
Color Coordinates ◽  
Uv Led ◽  
Color Tunable ◽  
White Light Emitting Diodes

A white LED consisting of a LSCSN:0.03Eu2+ phosphor and a 375 nm UV LED chip had CIE color coordinates of (0.3568, 0.3111) and achieved a Ra of 82.5 around the correlated color temperature of 3318 K.

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.

Optimization Spectrum of White Light Emitting Diodes Based on Correlated Color Temperature and Luminous Flux

2015 ◽  
Vol 44 (10) ◽  
pp. 1030001
Author(s):  
黄马连 HUANG Ma-lian ◽  
陈焕庭 CHEN Huan-ting ◽  
周小方 ZHOU Xiao-fang ◽  
蔡嘉毅 CAI Jia-yi ◽  
周锦荣 ZHOU Jin-rong ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Luminous Flux ◽  
Color Temperature ◽  
Light Emitting ◽  
White Light Emitting Diodes
Sign in / Sign up

Export Citation Format

Share Document