Scientific Achievement
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.
Research Details
- 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.
About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://science.osti.gov/User-Facilities/User-Facilities-at-a-Glance.
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