Emergence of deep levels in n-type ZnSe under hydrostatic pressure.

Photoluminescence is measured in n-type ZnSe doped with Ga and Cl under pressures to 100 kba 7 K). For each dopant, the rate of pressure shift of the self-activated band changes at 25–30 kb faster than to slower than that of the band gap. The change is evidence that a previously unknow donorlike state emerges from the electron continuum. This state probably is related to zinc va donor complexes, whose levels move lower in the gap with compression.