Patent ID: 7141830

Claim:
A semiconductor light emitting device, comprising: a semiconductor substrate; a multi-layer structure formed on the semiconductor substrate, the multi-layer structure comprising a light emitting region; an undoped film of In x Ga y Al z N overlaying the multi-layer structure, wherein x+y+z=1, and 0≦x,y,z≦1; and a layer, consisting of a transparent conductive oxide, overlaying the undoped film; wherein an operating forward voltage of said semiconductor light emitting device is determined by the following formula: V t = EXP ⁡ ( - 4 ⁢ ( 2 ⁢ m * · E g 3 ) 3 / 2 3 ⁢ e · h _ · E ) , m * is the effective electron or hole mass, E g is the effective band-gap of the undoped film, e is an electron charge, {overscore (h)} is the Plank's constant, and E is the electric field across the undoped film.