RECOMBINATION KINETICS OF S1 AND S2 BANDS IN ZNSE-ZNTE SUPERLATTICES

The origin of the S1 and S2 emission bands observed in ZnSe-ZnTe super lattices is discussed on the basis of time-resolved photoluminescence measurements. We show that the decay characteristics of the S1 and S2 band are described each by a single time constant, irrespective of obs ervation energy. This indicates that the S1 and S2 bands are homogeneo usly broadened due to electron-phonon coupling, supporting the idea th at the recombination of self-trapped excitons is a relevant mechanism for these emissions. (C) 1998 Elsevier Science B.V. All rights reserve d.