Patent ID: 7268372
Filing Date: 2007-09-11
Classification: H01L

Abstract:
1. A GaN light emitting diode, comprising: a first conductive GaN clad layer which is a GaN crystalline layer doped with an n-type impurity; a first contact formed on and in direct contact with an upper surface of the first conductive GaN clad layer; an active layer formed on a lower surface of the first conductive GaN clad layer; a second conductive GaN clad layer formed on a lower surface of the active layer, wherein the second conductive GaN clad layer is a GaN crystalline layer doped with a p-type impurity; a conductive adhesive layer formed below the second conductive GaN clad layer; a conductive substrate formed on a lower surface of the conductive adhesive layer; a second contact formed on a lower surface of said conductive substrate; and a reflective layer made of a conductive material and formed between and in direct contact with both the second conductive GaN clad layer and the conductive adhesive layer; wherein the conductive adhesive layer is made of a material selected from the group consisting of Au—Sn, Sn, In, Au—Ag and Pb—Sn; and the reflective layer has a uniform thickness and covers the entire lower surface of the second conductive GaN clad layer, the reflective layer being in direct and ohmic contact with the second conductive GaN clad layer throughout the entire lower surface of the second conductive GaN clad layer.