Spatially resolved photoluminescence mapping of single CdS nanosheets

Abstract

We have utilized spatially resolved low temperature photoluminescence to probe the electronic states and structural symmetries of individual single crystalline CdS nanosheets. Spatially resolved photoluminescence imaging of a single CdS nanosheet reveals a distinctive spectral variation across the nanosheet. We observe A-like exciton states which emit most strongly near the outer edges of the 5 mu m wide nanosheet, while B-like exciton states emit most strongly along the center region of the 30 mu m long axis of the nanosheet.