ABSORPTION AND PHOTOLUMINESCENCE OF ZNSE ZNXCD1-XSE SUPERLATTICES ANDQUANTUM-WELLS UNDER HYDROSTATIC-PRESSURE/

We present absorption measurements of a pseudomorphic Zn0.75Cd0.25Se/Z nSe superlattice and a Zn0.91Cd0.09Se/ZnSe single quantum well under h igh hydrostatic pressure applied by a diamond anvil cell. Excitonic tr ansitions as 1s-heavy hole and 1s-light hole between the first bound s tates or minibands as well as transitions in the buffer material are v isible. Transition energies are well understood by calculations of the band structure near Gamma. The observed energy distance between photo luminescence and hh-absorption signal gives information on exciton loc alization. Whereas this distance is nearly pressure independent in the buffer, there is a significant increase at pressures P > 5 GPa for qu antum structures.