Photoluminescence, excitation spectroscopy and magneto-photoluminescence experiments are performed up to 5.5T at low temperature (1.7K) in a ZnSe/Zn0.73Mn0.27Se double quantum well. The experimental results are compared with calculations of the excitonic transitions, available for a type-I and a type-II band structure. These calculations include the strain effects, the giant Zeeman effect in the
... [Show full abstract] (Zn,Mn)Se layers under a magnetic field, the diamagnetic shift of the exciton. We determine the strain state of the heterostructure and find a quite unusual configuration of the band structure : the fundamental optical transitions of the two wells are type-I light hole transitions, while the excited optical transitions are type-II heavy hole transitions.