This work determined the anisotropic optical properties
of perovskite (CsPbBr3) nanoplatelets (NPLs) with different thicknesses using photoselection methods. The data revealed that thinner nanoplatelets -- three monolayers and less -- have absorption and emission transitions that are strongly plane-polarized. Anisotropy decreases with number of monolayers
Significance and Impact
Dominant planar emission is a valuable asset for improving the efficiency of light-emitting technologies.
- Fluorescence anisotropy measurements indicated that the band-edge absorption and emission for ensembles of the NPLs exceeds 0.08, approaching the theoretical value of perfect in-plane polarization of 0.1.
Work was performed in part at the Center for Nanoscale Materials.
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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