The dependence of the energy position of the deep defect-related photoluminescence line Y-1.2 eV in Ge-doped GaAs on high hydrostatic pressure is investigated using a Dunstan-like diamond anvil cell. The observation that the energy position of the line follows that of the Γ-conduction band minimum in the 1 bar-30 kbar pressure range demonstrates that the line has Γ-(free or shallow bound)-to-deep acceptor character. This fact confirms the deep-acceptor character of the deep defect, most likely a donor impurity-Ga vacancy complex, which contributes to the Y:-1.2 eV photoluminescence line.
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