Photoinduced charge-transfer dynamics between CdSe quantum dots (QDs) possessing varying monolayers
of ZnS and hole scavengers such as phenothiazine (PT) and N-methylphenothiazine (NMPT) were investigated
for optimizing the shell thickness of core−shell quantum dots. Spectroscopic investigations indicate that
phenothiazine binds onto the surface of bare CdSe QDs, resulting in the photoluminescence quenching, and
two monolayers of ZnS prevent the electron-transfer process. Methodologies presented here can provide
quantitative information on the optimum shell thickness of core−shell QDs, which can suppress the undesired
electron transfer and provide maximum luminescence yield.
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