Intersubband electroluminescence results are presented from Si/SiGe quantum cascade emitters at
3.2THz and at temperatures up to
150K. The effect of adding doping into the active quantum wells was studied in addition to reduced barrier widths from previous measurements. While the current through the sample is increased by the addition of doping, the emitted power is reduced through additional free carrier absorption and Coulombic scattering. Free electron laser measurements confirm the intersubband transitions in the quantum wells of the cascade devices and produce non-radiative lifetimes of
20ps between 4 and
150K.