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US 8,772,792 B2Granted
LED with surface roughening
AssigneeCree, Inc.
InventorsSteven P. DenBaars, Shuji Nakamura, Max Batres
Life of this patent
Estimating the term…
Abstract
An LED having a p-type layer of material with an associated p-contact, an n-type layer of material with an associated n-contact and an active region between the p-type layer and the n-type layer, includes a roughened emitting-side surface to further enhance light extraction.
Claims21
A light emitting diode (LED) comprising:
- a first layer of first conductivity type having an associated first contact;
- a second layer of second conductivity type having an associated second contact;
- an active region between the first and second layers;
- and
- a layer comprising transparent conductive material between the first layer and the first contact and extending on the first layer beyond the first contact, the layer comprising transparent material having a first face adjacent the first layer and a second face remote from the first layer, the second face being smooth beneath the first contact and at least a portion of the second face being rough beyond the first contact.
2 more elements
A light emitting diode (LED) comprising:
- a first layer of first conductivity type having an associated first contact;
- a second layer of second conductivity type having an associated second contact;
- an active region between the first and second layers;
- and
- a layer comprising transparent conductive material between the first layer and the first contact and extending on the first layer beyond the first contact, the layer comprising transparent material having a first face adjacent the first layer and a second face remote from the first layer, the first contact having a first face adjacent the first layer and a second face remote from the first layer, wherein the second face of the layer comprising transparent conductive material extends further away from the first layer than the first face of the first contact.
2 more elements
Dependencies are inferred from the claim text.