Abstract
We propose the effects of phosphor concentration
and leadframe reflectivity on phosphor-converted LEDs (pc-LEDs) manufactured
using the dispensing method in this study. Simulation results showed
that the luminous flux increased with the phosphor concentration and
reflectivity of the reflective cup, even as the total output power
decreased as the phosphor concentration increasing. It was also found
that the leadframe reflectivity would dominate the optical and chromatic
characteristics of pc-LEDs as well as the phosphor concentration.
Specifically, for the pc-LEDs with a low phosphor concentration, the
leadframe reflectivity and phosphor concentration were crucial factors
determining the total output power and chromaticity deviation. However,
for the pc-LEDs with a high phosphor concentration, only the phosphor
concentration determined the chromaticity deviation.
© 2015 IEEE
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