LIGAND-FIELD MODEL FOR THE ELECTRONIC-STRUCTURE OF THE FLUORESCENT LEVELS OF D(5) IONS IN II-VI COMPOUNDS

An analysis of the first-order spin-orbit (SO) interaction for the flu orescent levels of Mn2+ in the common cation series ZnS, ZnSe, ZnS and also in CdTe shows that, with respect to the results of the crystal-f ield model, the SO interaction is strongly reduced for the fluorescent state of Mn in ZnS and strongly enhanced and of opposite sign for ZnS e, ZnS and CdTe. It is shown that, for ligands Se and Te, the molecula r SO interaction is primarily controlled by the large SO coupling cons tants of the electrons 4p(Se) and Sp(Te) of the ligands.