The emissive transition dipole moment (TDM) of CsPbBr3 perovskite nanocrystals were readily tuned by manipulating the particle’s shape and interfaces.
Significance and Impact
The unique tunability of the electronic transition that governs light emission in perovskites introduces a valuable method to extend the efficiencies of photonic devices beyond those based on isotropic materials.
- Thin films of quasi 2D perovskite nanoplatelets exhibit anisotropically aligned average TDM into the plane of the substrate, as verified by two distinct optical measurements.
- By controlling the interface with a thin transparent layer of alumina, the angle between the TDM and the substrate was further reduced by more than 50% to only 14o.
- Modeling verifies the angle reduction results from the introduction of an antiparallel charge redistribution.