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Time-resolved and time-integrated circularly polarized photoluminescence ofexcitons and trions in external magnetic fields up to 10 T has been studied inundoped and n-type doped quantum well structures based on ZnSe. In an undopedstructure, a circular polarization of photoluminescence induced by magneticfields corresponded to the Boltzmann distribution of excitons on Zeemansublevels. The inverse spin orientation of excitons is observed in dopedsamples with a carrier density of $3 \times 10^{10}$ cm$^{-2}$ and higher.Model calculations show that the reason for the inverse spin orientation is theeffective depletion of the lowest-exciton Zeeman sublevel as a result of thespin-dependent formation of trions. The trion formation time as a result ofexciton-electron binding was determined as 2 ps. This is noticeably shorterthan the characteristic time of the exciton-photon interaction. The observedeffect can be considered as a way of spin manipulation by electric fields.

Inverse exciton spin orientation due to trion formation in modulation doped quantum wells