PHOTOLUMINESCENCE AND MULTIPHONON RESONANT RAMAN-SCATTERING IN NI-DOPED AND CO-DOPED ZN1-XMNXTE CRYSTALS

Low-temperature photoluminescence, exciton reflection, and multiphonon resonant Raman scattering spectra of Ni-and Go-doped Zn1-xMnxTe cryst als were investigated. Intense emission occurs in a broad spectral reg ion (1100-17 000 cm(-1)) in the crystals containing Ni atoms. It is ca used by intracenter transitions involving Mn2+ ions and transitions be tween the conduction band and a level of the doubly charged acceptor. The features of the exciton photoluminescence and multiphonon resonant Raman scattering involving longitudinal-optical (LO) phonons at vario us temperatures are investigated. The insignificant efficiency of the localization of excitons on potential fluctuations in the Zn1-xMnxTe:C o crystals is established. A temperature-induced increase in the inten sity of the 5LO multiphonon resonant Raman scattering line due to the approach of the conditions for resonance between this line and the gro und exciton state is observed in these crystals. (C) 1998 American Ins titute of Physics.