Apr 8, 2025
11:00am - 11:30am
Summit, Level 4, Room 427
Bin Hu1
South China University of Technology1
Hybrid metal-halide perovskite nanoparticles can aggregate into different shapes to prepare thin-film samples towards device applications. On the other hand, the excitons in perovskite nanoparticles are formed in
J states carrying both orbital and spin momentum. We found that, when the MAPbBr
3 nanoparticles aggregate into rod-like shape, an ASE can be easily observed with low threshold pumping energy. When the MAPbBr
3 nanoparticles aggregate into diamond-like shape, it is very difficult to demonstrate an ASE. This presents aggregation-shape effects of ASE in perovskite nanoparticles. Furthermore, we found that the exciton-exciton interactions are dominated by in-phase orbital polarizations in the ASE observed in the MAPbBr
3 nanoparticles aggregated with rod-like shape. This indicates that the exciton-exciton interaction within perovskite nanoparticles can be controlled by aggregation shape towards developing lasing actions. This presentation will discuss the aggregation shape effects of ASE through exciton-exciton interaction in perovskite nanoparticles.