Patent ID: 6346719
Filing Date: 2002-02-12
Classification: H01L

Abstract:
A light-emitting diode comprising:a p-type GaAs single crystal substrate having provided thereon in the following order a p-type lower cladding layer, a light-emitting layer, and an n-type upper cladding layer, each layer of which is represented by (AlXGa1âˆ’X)YIn1âˆ’YP (0&lE;X&lE;1, 0&lE;Y&lE;1) including the case where each layer has different mixed crystal ratios X, Y, wherein said n-type upper cladding layer includes three n-type layers, each layer having a different electron concentration and being represented by (AlXGa1âˆ’X)YIn1âˆ’YP (0&lE;X&lE;1, 023 Y&lE;1) including the case where each layer has different mixed crystal ratios X, Y, wherein said three n-type layers being referred to as a first n-type layer with an electron concentration of n1 and a layer thickness of d1, a second n-type layer with an electron concentration of n2 and a layer thickness of d2, and a third n-type layer with an electron concentration of n3 and a layer thickness of d3 counted in the order from the layer on the side near said light-emitting layer, wherein the electron concentrations of said three layers being in the relationship of n3>n1>n2, and a window layer composed of a metal oxide, which is provided on said n-type upper cladding layer.