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 semicon ductor Zn1-xMnxSe can serve as an efficient channel to reduce the role of thermalized excitons in the recombination spectrum. This circumsta nce allows clear observation and characterization of luminescence from nonthermal, or ''hot,'' excitons, which have rapidly relaxed via mult iple longitudinal-optical (LO) phonon emission to the excitonic band-g ap state (E(gx)). A resonant enhancement in the hot-exciton emission i s observed whenever the photon energy of excitation is exactly an inte ger number of LO phonons above E(gx). Tuning of the gap states in a ma gnetic field serves as a means of sweeping through the resonant condit ion for the identification of the hot luminescence. Strikingly, the am plitude variations in the hot-exciton luminescence are reflected in th e Mn-ion internal d-electron emission at yellow wavelengths.