Patent ID: 7528417

Claim:
A light-emitting diode device comprising: an AlGaInP active layer ( 6 ); a positive-electrode-side cladding layer ( 7 , 8 ) and a negative-electrode-side cladding layer ( 4 , 5 ) which sandwich the active layer and have an energy band gap value greater than an energy band gap value of the active layer; and a window layer ( 9 ) which is formed on the positive-electrode-side cladding layer and has an energy band gap value greater than that of the active layer; wherein the positive-electrode-side cladding layer comprises an undoped AlInP layer ( 7 ) grown to have a thickness of 0.5 μm or more and kept in contact with the active layer, and an intermediate layer ( 8 ) doped to assume p-type conductivity, kept in contact with the window layer and having an intermediate energy band gap value between an energy band gap value of the undoped AlInP layer and that of the window layer.