ZN1-XMGXSE SAMPLES AND A ZNSE ZN0.93MG0.O7SE QUANTUM-WELL UNDER PRESSURE - OPTICAL-ABSORPTION AND PHOTOLUMINESCENCE/

We present optical measurements of freestanding: thin Zn1-xMgxSe films and of a ZnSe/Zn0.93Mg0.07Se single quantum well (SQW) under hydrosta tic pressure applied by a diamond anvil cell. For the Zn1-xMgxSe compo unds the pressure shift of the fundamental gap was determined from abs orption measurements at room temperature for x less than or equal to 0 .37. A hydrostatic deformation potential a(x) = -4.85 + 0.672 eV is de rived. The transition pressures P-tr to high pressure phases were dete rmined by visual observation. The pressure dependent absorption and ph otoluminescence of the ZnSe SQW was investigated at 2 K. Tile energy s hift of two SQW-related transitions was recorded and is reproduced by a simple theoretical model. LO-phonon replica were visible in photolum inescence at the sharp 11hh transition.