Patent ID: 8325775

Claim:
A light emitting semiconductor device with efficient electron injection from a wide bandgap semiconductor material into a narrower bandgap semiconductor material, comprising: an active region comprising one or more quantum wells and one or more quantum well barriers and having a quantum well barrier bounding each side of the active region; an injection structure adjacent to one of the bounding quantum well barriers of the active region, the injection structure being formed from a semiconductor material comprising AlGaAs, the injection structure comprising: an n-doped confining region having the formula Al x Ga 1-x As where x is in a range from about 0.7 to about 1.0; and an n-doped intermediate structure positioned between the confining region and the active region, the intermediate structure comprises an inflection in a ramping of the aluminum content from the active region to the confining region, the intermediate structure having the formula Al x Ga 1-x As where x is in a range from about 0.35 to about 0.7.