Abstract
This study demonstrates how the insertion of a thin silicone
layer into a dual-layer remote phosphor structure enhances light extraction
in white light-emitting diodes (WLEDs). In the experiment, a dual-layer phosphor
structure yielded a higher intensity of blue and yellow components than a
conventional structure. Moreover, the lumen flux was 5% higher than a conventional
remote phosphor package at the same correlated color temperature (CCT). Using
a TFCalc32 simulation, the electric field intensity was calculated for different
thicknesses of the dual-layer remote phosphor structures, and the enhanced
use of blue rays was verified. Additionally, the dual-layer structure reduces
chromaticity deviations as the driving current increases.
© 2013 IEEE
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