Abstract
The optimized exploitation of perovskite nanocrystals and nanoplatelets as highly efficient light sources requires a detailed understanding of the energy spacing within the exciton manifold. Dark exciton states are particularly relevant because they represent a channel that reduces radiative efficiency. Here, we apply large in -plane magnetic fields to brighten optically inactive states of CsPbBr3-based nanoplatelets for the first time. This approach allows us to access the dark states and directly determine the dark-bright splitting, which reaches 22 meV for the thinnest nanoplatelets. The splitting is significantly less for thicker nanoplatelets due to reduced exciton confinement. Additionally, the form of the magneto-PL spectrum suggests that dark and bright state populations are nonthermalized, which is indicative of a phonon bottleneck in the exciton relaxation process.
Item Type: | Journal article |
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Research Centers: | Center for NanoScience (CENS) |
Subjects: | 500 Science > 500 Science |
ISSN: | 1530-6984 |
Language: | English |
Item ID: | 115171 |
Date Deposited: | 02. Apr 2024, 08:11 |
Last Modified: | 02. Apr 2024, 08:11 |
DFG: | Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390776260 |