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 $\mu{\hbox {m}}$.
© 2009 IEEE
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