Composite high reflectivity layer
First Claim
1. A light emitting diode (LED) chip, comprising:
- an active region between two oppositely doped layers;
a composite high reflectivity layer arranged to reflect light emitted from said active region, said composite layer comprising;
a first layer;
one or more second layers and a plurality of third layers on said first layer, said second layers having an index of refraction different from said third layers, wherein at least one of said second layers is interposed between two of said third layers, and each of said third layers having different thicknesses compared to the other of said third layers; and
a reflective layer on the topmost of said second and third layers;
wherein said composite high reflectivity layer is on a side of a substrate opposite said active region.
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Accused Products
Abstract
A high efficiency light emitting diode with a composite high reflectivity layer integral to said LED to improve emission efficiency. One embodiment of a light emitting diode (LED) chip comprises an LED and a composite high reflectivity layer integral to the LED to reflect light emitted from the active region. The composite layer comprises a first layer, and alternating plurality of second and third layers on the first layer, and a reflective layer on the topmost of said plurality of second and third layers. The second and third layers have a different index of refraction, and the first layer is at least three times thicker than the thickest of the second and third layers. For composite layers internal to the LED chip, conductive vias can be included through the composite layer to allow an electrical signal to pass through the composite layer to the LED.
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Citations
15 Claims
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1. A light emitting diode (LED) chip, comprising:
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an active region between two oppositely doped layers; a composite high reflectivity layer arranged to reflect light emitted from said active region, said composite layer comprising; a first layer; one or more second layers and a plurality of third layers on said first layer, said second layers having an index of refraction different from said third layers, wherein at least one of said second layers is interposed between two of said third layers, and each of said third layers having different thicknesses compared to the other of said third layers; and a reflective layer on the topmost of said second and third layers; wherein said composite high reflectivity layer is on a side of a substrate opposite said active region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification