The anisotropy of the Zeeman splitting of bound excitons was studied as a function of the magnetic field direction in films which were doped with various dopants. The observed internal distortion was associated with defect complexes that consisted of n-type dopants (Cl, I, In) that were compensated by nearby Cd vacancies. The Zeeman splittings that were observed in luminescence experiments at low temperatures were explained in terms of a modified Hamiltonian which took account of the reduced site symmetry of the traps. The diamagnetic shifts revealed a reduced mass of the bound excitons. After several months of storage at room temperature, changes in photoluminescence were observed which indicated that the formation of defects took place with time.

L.Worschech, W.Ossau, F.Fischer, A.Waag, G.Landwehr: Journal of Crystal Growth, 1996, 159, 397-401