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Optical transitions in Zn1-xCoxSe and Zn1-xFexSe: Strong concentration-dependent effective p-d exchange.

Results of photoluminescence (PL) and resonant Raman scattering from single crystalline epitaxial films of Zn 1-x Co x Se and Zn 1-x Fe x Se are presented. Samples with Co concentrations up to x=0.1 and Fe concentrations in the range 0<x<0.75 were studied. For x<0.03 (Co) and x<0.30 (Fe) the optical emission associated with the 3d deep levels are observed as discrete transitions that broaden very rapidly and weaken as the doping further increases. It is proposed that the increase in concentration x leads to an increase in the exchange between low-lying crystal-field split d levels and band electrons, and thus to the changes in the photoluminescence