HOT-EXCITON LUMINESCENCE AND ENERGY-TRANSFER INTO D-ELECTRON STATES IN ZN1-XMNXSE

Rapid electronic energy transfer from photoexcited electron-hole pairs into d-electron states of the Mn2+ion in the diluted magnetic semiconductor Zn1-xMnxSe can serve as an efficient channel to reduce the role of thermalized excitons in the recombination spectrum. This circumstance allows clear observation and characterization of luminescence from nonthermal, or ''hot,'' excitons, which have rapidly relaxed via multiple longitudinal-optical (LO) phonon emission to the excitonic band-gap state (E(gx)). A resonant enhancement in the hot-exciton emission is observed whenever the photon energy of excitation is exactly an integer number of LO phonons above E(gx). Tuning of the gap states in a magnetic field serves as a means of sweeping through the resonant condition for the identification of the hot luminescence. Strikingly, the amplitude variations in the hot-exciton luminescence are reflected in the Mn-ion internal d-electron emission at yellow wavelengths.