Abstract
Micro-patterned red-phosphor-dot-doped array in mirror-surface
substrate light-emitting diodes (LEDs), which are primarily characterized
with imbedded red phosphor dots in yellow phosphor slurry and an installed
mirror on the substrate surface, are investigated. These dots scatter
lights in different colors, compensate the long waveband in LED spectra,
and allow exiting blue rays to escape in large angles. This mirror surface
reflects downward blue lights emitted by chips, blends
various-wavelengthed light beams, and enhances the cooling effect on the
entire module. With the aid of these two modifications, the quantum
efficiency (QE) and the luminous efficacy of radiation (LER) have been
typically elevated by 16.6% and 38.8%, respectively. Proposed modules can
be used in the LED industry for guiding improvements of QE, LER, and
yellow–blue ratio uniformity.
© 2016 IEEE
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