Broadband dielectric reflectors for LED
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United States of America Patent
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Aug 4, 2015
Grant Date -
Oct 3, 2013
app pub date -
Apr 2, 2012
filing date -
Apr 2, 2012
priority date (Note) -
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Abstract
A broadband, omnidirectional, multi-layer, dielectric reflector for an LED in a white light emitting device provides both near 100% reflectivity across the visible spectrum of light, and electrical insulation between the substrate and the electrical circuitry used to power and control the LED. When a sealant material, having a higher index of refraction than air, is used to protect the LED and the accompanying electrical circuitry, an aluminum reflector layer or substrate is provided to make up for the loss of reflectivity at certain angles of incidence.
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