Effect of Phosphor Particle Size on Luminous Efficacy of Phosphor-Converted White LED

Author

Nguyen The Tran ; Jiun Pyng You ; Shi, Frank G.

Author_Institution

Optoelectron. Packaging & Mater. Labs., Univ. of California, Irvine, CA, USA

Volume

27

Issue

22

fYear

2009

Firstpage

5145

Lastpage

5150

Abstract

In this paper, the influence of YAG:Ce phosphor particle sizes on the lumen output and the conversion efficiency of both in-cup phosphor and top remote phosphor LED packages are investigated with 3-D ray-tracing simulations. The lumen output and the conversion efficiency of both types of phosphor-converted (pc) white LED packages are dependent on the size of YAG:Ce particles. The lumen output and conversion efficiency of both types of pc-white LED packages are minimal at the phosphor particle size with the size parameter of around one and are highest at the particle size in micron size. The simulation results show that both in-cup and top remote phosphor packages have the highest lumen output and the highest conversion efficiency at the particle size of around 20 mum.

Keywords

cerium; light emitting diodes; particle size; phosphors; ray tracing; yttrium compounds; 3-D ray-tracing simulations; LED; YAG:Ce; conversion efficiency; lumen output; luminous efficacy; particle size; phosphor; LED; WLED; phosphor; phosphor size;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2009.2028087

Filename

5169978