Abstract
The Luminescence of CdS and mixed ZnS · CdS semiconductor particles supported in Nafion polymer films has been studied to elucidate the previously reported synergism in the ZnS · CdS system for photoredox H2 production. (J. Phys. Chem. 89 (1985) 723). The luminescence of these systems is complex, depending on the history of the particular sample, the intensity and wavelength of the exciting light, and the presence of ions that can quench specific emitting states (e.g. S2- or methylviologen). For the mixed ZnS · CdS system the two semiconductors do not alloy but there is intimate contact between the ZnS and CdS phases, indicated by the complete quenching of ZnS luminescence. Prolonged irradiation produces a luminescent ZnS phase. The emission features agree reasonably well with sub-bandgap states deduced from earlier photoconductivity studies on CdS crystals. These results help explain why the reported emission features of CdS are as varied as the laboratories reporting them.
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