Patent ID: 6995389

Claim:
A light emitting device comprising: a region of first conductivity type; a region of second conductivity type; an active region disposed between the region of first conductivity type and the region of second conductivity type, the active region comprising: a plurality of quantum well layers each comprising Al x Ga y In 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1) and each having a band gap; a barrier layer having a band gap; and a reservoir layer disposed between two of the quantum well layers and in direct contact with at least one of the quantum well layers or the barrier layer, the reservoir layer comprising Al x Ga y In 1-x-y N (0≦x≦1, 0≦y≦1, 0≦x+y≦1) and having a band gap; wherein the band gap of each of the quantum well layers is less than the band gap of the reservoir layer, the band gap of each of the quantum well layers is less than the band gap of the barrier layer, the reservoir layer has a thickness greater than a thickness of the barrier layer, the band gap of the barrier layer is greater than the band gap of the reservoir layer, and the reservoir layer provides carriers to the quantum well layers.