Hotspot Location Shift in the High-Power Phosphor-Converted White Light-Emitting Diode Packages

Thermal management of high-power light-emitting diodes (LEDs) plays an important role in determining their optical properties, reliability, and lifetime. In this paper, we present a method to study the temperature field of phosphor-converted LED packages by combining the Monte Carlo optical simulati...

Full description

Saved in:
Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 51; no. 9; pp. 09MK05 - 09MK05-4
Main Authors Hu, Run, Luo, Xiaobing, Zheng, Huai
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.09.2012
Online AccessGet full text

Cover

More Information
Summary:Thermal management of high-power light-emitting diodes (LEDs) plays an important role in determining their optical properties, reliability, and lifetime. In this paper, we present a method to study the temperature field of phosphor-converted LED packages by combining the Monte Carlo optical simulation and finite element simulation together. The temperature field, including the heat generation in both LED chip and phosphor layer, are presented and analyzed. It was found that temperature increased with the increase in phosphor concentration and the hotspot location in remote phosphor-coating packages shifted with the changes in phosphor concentration, while there was no shift in direct phosphor-coating packages. It was concluded that the hotspot location in the high-power phosphor-converted white LED packages depended on phosphor concentrations as well as packaging methods.
Bibliography:Typical structure of conventional blue LED chip. Half-3D view of white LED packages with (a) direct phosphor coating and (b) remote phosphor coating. Heat generation of the chip and the phosphor layer with different phosphor coatings. Temperature distribution of the LED package with direct phosphor coating with different phosphor concentrations: (a) 0.05, (b) 0.2, and (c) 0.35 g/cm 3 . Temperature distribution of the LED package with remote phosphor coating with different phosphor concentrations: (a) 0.05, (b) 0.2, and (c) 0.35 g/cm 3 . Temperature comparisons with the changes in phosphor concentration of LED packages with (a) direct phosphor coating and (b) remote phosphor coating.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.09MK05