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, said second and third layers alternating, 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.
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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.
60 Citations
45 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, said second and third layers alternating, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A light emitting diode (LED) chip,
a submount with an LED mounted to said submount; - and
a composite high reflectivity layer arranged between said submount and said LED to reflect LED light, said composite layer comprising a plurality of layers and a conductive path through said composite layer through which an electrical signal can pass to said LED. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A light emitting diode (LED) chip, comprising:
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an LED comprising an active region; and a composite high reflectivity layer integral to said LED to reflect light emitted from said active region, said composite layer comprising a first layer, and alternating second and third layers on said first layer, said second and third layers having a different index of refraction, and said first layer being at least three times thicker that the thickest of said second and third layers. - View Dependent Claims (36, 37, 38, 39, 40)
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41. A method for fabricating a light emitting diode (LED) chip, comprising:
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forming an LED; depositing a composite high reflectivity layer on said LED; forming conductive vias through said composite layer to said LED; mounting said LED to a submount with said composite layer between said LED and said submount; and depositing contacts.
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42. A light emitting diode (LED) chip, comprising:
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an LED; and a composite high reflectivity layer integral to said LED to reflect light emitted from said LED, said composite layer comprising a first layer, and one or more second layers and a plurality of third layers on said first layer, said second and third layers comprising incomplete second and third layer pairs. - View Dependent Claims (43, 44, 45)
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Specification