Abstract
The photoluminescence of Ge‐doped AlxGa1−xAs (with 0.26 < x < 0.43) has been investigated. For carrier concentrations ∼1017 cm−3 a new luminescence line is observed. An analysis based on the configurational coordinate model indicates that a complex center is involved. The center is believed to be a GeAs−VAs complex from which emission has also been observed in GaAs.