Patent ID: 6384430
Filing Date: 2002-05-07
Classification: H01L

Abstract:
A light emitting diode, comprising:a substrate; a light emitting layer; a p-type cladding layer having an energy gap greater than an energy gap of the light emitting layer; and an n-type cladding layer having an energy gap greater than the energy gap of the light emitting layer, wherein the light emitting diode is made of at least III-V compound semiconductor material and has a double heterostructure such that the light emitting layer is interposed between the p-type and n-type cladding layer; the p-type cladding layer includes a p-type second intermediate barrier layer and a p-type second cladding layer; the p-type second intermediate barrier layer is nearer the light emitting layer than the p-type second cladding layer is; and the p-type second intermediate barrier layer has a lower molar fraction of Al and a lower impurity concentration than a molar fraction of Al and an impurity concentration of the p-type second cladding layer, respectively.