Light-Emitting Diodes Operating at 2 $\mu{\rm m}$ With 10 mW Optical Power

Light-emitting diodes emitting near 2 μm producing quasi-continuous wave optical power of at room temperature have been demonstrated. The combination of a strain-engineered quantum well active region and a cascaded injection scheme made it possible to achieve an internal efficiency of 120%. The higher wall plug efficiency of the two-cascade devices indicates that Auger recombination is primarily responsible for the efficiency drop at high injection levels.