This additional emission peak also indicates the actual incorporation of dopant species into host
ZnS structure. As mentioned, the slight redshift can be assigned to the effects of quantum
confinement since a layer of shell material was developed on the core material, thus making
system grow. The photoluminescence quenching is obviously evidenced from the figure 33
which is possibly ascribed to interfacial charge transfer between Fe3O4 nanoparticles and doped-
ZnS nanocrystals.