Abstract
Effects of YAG: Ce phosphor particle size on the luminous flux and angular color
uniformity have been studied by using Monte Carlo ray-tracing simulation. A white LED
model basing on Cree XLamp is constructed. The phosphor particle size is changed from 2
to 20 $\mu$m. Different simulation cases are carried out by changing the phosphor
concentration and thickness. Results revealed that the luminous flux and angular color
uniformity have complex relationships with the particle size depending on applied
phosphor concentration and desired color temperature. A general finding is that an
increase of the particle size is beneficial for the improvement of luminous flux but
leads to worse angular color uniformity. A 2 μm particle achieves not only the best
angular color uniformity but the lowest luminous flux. A particle size larger than 10
μm generates the highest luminous flux at low color temperature when the
concentration is around 1.5 g/cm<sup>3</sup>. A particle size between 2 μm and 10 μm
shows combined moderate performance when the phosphor concentration is higher than 2
g/cm<sup>3</sup>. To realize the best combined performance, a particle size around 6 μm is
suggested.
© 2012 IEEE
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