Patent ID: 7087931
Filing Date: 2006-08-08
Classification: H01L

Abstract:
1. A light emitting diode (LED), comprising: a substrate; a first conductive type nitride layer disposed on the substrate as a cladding material; an active layer disposed on the first conductive type nitride layer as a luminance material; a second conductive type nitride layer disposed on the active layer as a cladding material; a first contact layer disposed on the second conductive type nitride layer, the first contact layer having a first bandgap; a second contact layer disposed on the first contact layer, the second contact layer having a second bandgap, wherein the first bandgap is smaller than the second bandgap; and a conductive transparent layer disposed on the second contact layer; wherein the second contact layer is smaller than a predetermined thickness and a tunneling effect is occurred between the conductive transparent layer and the second contact layer while the LED is in operation.