Effects of Different Package Structures on Thermal Properties of High Power White LED

2012 ◽  
Vol 503 ◽  
pp. 397-401 ◽  
Author(s):  
Zhe Ran Sun ◽  
Da Ming Wu ◽  
Ya Jun Zhang ◽  
Jian Zhuang ◽  
Kai Fang Dang
Keyword(s):  
Thermal Properties ◽  
Thermal Resistance ◽  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
White Led ◽  
Forward Voltage ◽  
Light Emitting

The characteristics of several package structures of high power white Light emitting diode (LED) are described in this paper. The influence of different structures on thermal properties is analyzed. Forward voltage method is used to test the thermal resistance of LED chips.

Phosphor concentration and geometry for high power white light emitting diode

2010 ◽  
Author(s):  
Kyung-Mi Moon ◽  
Se-Hwan An ◽  
Hyung-Kun Kim ◽  
Jung-Hye Chae ◽  
Yong-Jo Park
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Light Emitting

Phosphor–silicone interaction effects in high power white light emitting diode packages

2017 ◽  
Vol 28 (23) ◽  
pp. 17557-17569 ◽  
Author(s):  
Jiajie Fan ◽  
Mengni Zhang ◽  
Xiao Luo ◽  
Cheng Qian ◽  
Xuejun Fan ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Interaction Effects ◽  
Light Emitting

Analysis of high-power packages for white-light-emitting diode lamps with remote phosphor

2005 ◽  
Vol 892 ◽  
Author(s):  
Hong Luo ◽  
Jong Kyu Kim ◽  
Yangang Xi ◽  
E. Fred Schubert ◽  
Jaehee Cho ◽  
...  
Keyword(s):  
Ray Tracing ◽  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Blue Phosphor ◽  
Remote Phosphor ◽  
Optical Modes ◽  
Diffuse Reflector

AbstractAn optimized packaging configuration for high-power white-light-emitting diode (LED) lamps that employs a diffuse reflector cup, a remote phosphor and a hemi-spherically-shaped encapsulation is presented. Ray tracing simulations for this configuration show that the phosphor efficiency can be enhanced by up to 50% over conventional packages. It is experimentally shown that dichromatic LED lamps with remote phosphor and diffuse reflector cup configuration have higher phosphor efficiency by 15.4% for blue-pumped yellow phosphor and by 27% for ultraviolet-pumped blue phosphor over conventional packages. Those improvements are attributed to reduced absorption of the phosphorescence by the LED chip and the reduction of deterministic optical modes trapped inside the encapsulant.

Al2O3-Ce:GdYAG composite ceramic phosphors for high-power white light-emitting-diode applications

2019 ◽  
Vol 39 (6) ◽  
pp. 2149-2154 ◽  
Author(s):  
Xin Liu ◽  
Xinglu Qian ◽  
Zewang Hu ◽  
Xiaopu Chen ◽  
Yun Shi ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Composite Ceramic ◽  
Light Emitting

A high quality liquid-type quantum dot white light-emitting diode

Nanoscale ◽  
2016 ◽  
Vol 8 (2) ◽  
pp. 1117-1122 ◽  
Author(s):  
Chin-Wei Sher ◽  
Chin-Hao Lin ◽  
Huang-Yu Lin ◽  
Chien-Chung Lin ◽  
Che-Hsuan Huang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diode ◽  
White Led ◽  
High Quality ◽  
Light Emitting ◽  
Uv Led ◽  
Liquid Type ◽  
Color Conversion

In this study, a liquid-type QD white LED is demonstrated as an efficient color-conversion layer in UV LED packages.

Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip

2006 ◽  
Vol 510-511 ◽  
pp. 106-109 ◽  
Author(s):  
Chang Sik Son ◽  
Ho Jung Chang ◽  
Kang Hyun Jaekal ◽  
Young Chol Chang ◽  
Soo Wohn Lee
Keyword(s):  
Electrical Properties ◽  
Bias Voltage ◽  
White Light ◽  
Light Emitting Diode ◽  
White Led ◽  
Optical And Electrical Properties ◽  
Maximum Luminance ◽  
Mixing Conditions ◽  
Light Emitting ◽  
Yellow Phosphor

We prepared the surface mounted white light emitting diode (LED) chips by using yellow phosphors on the blue LED chip. The optical and electrical properties of prepared white LED chips were investigated. The yellow phosphor mixed with transparent epoxy was coated on the prepared LED chip. The optimum mixing conditions with epoxy and yellow phosphor is obtained at the mixing ration of epoxy: yellow phosphor = 97 : 3 wt %. The maximum luminance and light emitting efficiency are above 80,000 cd/m2 and 23.2 lm/W, respectively, at the bias voltage of 2.9 V. There was no distinct change in the luminance strength with changing of the yellow phosphor ratios. The flowing current of the white LED chip is about 30 mA at 2.9 V.

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