Patent ID: 6853012

Claim:
An AlGaInP light emitting diode, comprising: a semiconductor substrate with a first conductivity; a light re-emitting layer with said first conductivity on said semiconductor substrate; an AlGaInP layer with said first conductivity and having a first doping concentration on said light re-emitting layer; an AlGaInP lower cladding layer with said first conductivity and having a second doping concentration less than said first doping concentration on said AlGaInP layer; an undoped AlGaInP active layer on said AlGaInP lower cladding layer; an AlGaInP upper cladding layer with a second conductivity opposite to said first conductivity on said undoped AlGaInP active layer; a window layer with said second conductivity on said AlGaInP upper cladding layer; an annular-shaped top electrode with said second conductivity on said window layer; and a layered electrode with said first conductivity on a bottom of said semiconductor substrate, wherein said AlGaInP layer with said first conductivity and said first doping concentration has a thickness not less than that of said AlGaInP lower cladding layer.