Fast photoluminescence lifetimes of CdSe nanoplatelets previously suggested suppressed exciton scattering at low temperature, but multiple measurements of exciton motion confirm that excitons remain localized.
Significance and Impact
Because CdSe nanoplatelets show narrower absorption
and emission features than colloidal quantum dots, they have attracted interest in optical applications such as light-emitting diodes and lasers. Low temperature photo-physics of the samples informs underlying mechanisms of light emission and optical gain.
- Measurements of static absorption, transient absorption bleaching, and the optical Stark effect were performed between room temperature and 3 K on a series of nanoplatelet samples.
Work was performed in part at the Center for Nanoscale Materials, a DOE Office of Science user facility.
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