Patent ID: 6064076
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A light emitting diode having a transparent substrate, comprising:a transparent GaP semiconductor substrate of a first conductivity type having a first lattice constant;a first ohmic contact connected to said transparent substrate;a buffer layer of said first conductivity type formed on said transparent substrate, said buffer layer having a first lattice constant at a first junction formed between said buffer layer and said transparent substrate;a light generation region formed on said buffer layer, said buffer layer having a second lattice constant at a second junction formed between said buffer layer and said light generation region; anda second ohmic contact formed on said light generation region;wherein said buffer layer comprises (Al.sub.x Ga.sub.1-x).sub.y In.sub.1-y P with 0.ltoreq.x.ltoreq.1 and 0.ltoreq.y.ltoreq.1 for having a graded lattice constant gradually changing from said first lattice constant to said second lattice constant.