A Photoluminescence Study in PbS-EuS Superlattices

Abstract

Investigations of the photoluminescence of PbS-EuS superlattices deposited on (111)DaF2 substrates are presented. Quantum-size and deformation effects in photoluminescence spectra are observed. The strain-induced gap shift and valence-band offset is determined from experimental results. A strong stimulated photoluminescence with relatively low threshold was observed. It was found that the photocarriers generated in EuS barrier strongly affect the population of PbS subbands.