Zn Cd Se ∕ Zn Cd Mg Se quantum cascade electroluminescence

This letter reports electroluminescence emission from a Zn Cd Se ∕ Zn Cd Mg Se quantum cascade (QC) structure. With a two-well QC active region design, the II-VI heterostructure was grown lattice matched on an InP substrate by molecular beam epitaxy. Deep etched mesas were electrically pumped at current densities up to 10 kA ∕ cm 2 , producing optical emission centered near 4.8 μ m , in good agreement with the structure design. The light is predominantly TM polarized, confirming its intersubband origin. Electroluminescence was observed from 78 to 300 K .