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Layered halide perovskites exhibit remarkable optoelectronic properties andtechnological promise, driven by strongly bound excitons. The interplay ofspin-orbit and exchange coupling creates a rich excitonic landscape,determining their optical signatures and exciton dynamics. Despite the darkexcitonic ground state, surprisingly efficient emission from higher-energybright states has puzzled the scientific community, sparking debates onrelaxation mechanisms. Combining low-temperature magneto-optical measurementswith sophisticated many-particle theory, we elucidate the origin of the brightexciton emission in perovskites by tracking the thermalization of dark andbright excitons under a magnetic field. We clearly attribute the unexpectedlyhigh emission to a pronounced phonon-bottleneck effect, considerably slowingdown the relaxation towards the energetically lowest dark states. Wedemonstrate that this bottleneck can be tuned by manipulating the bright-darkenergy splitting and optical phonon energies, offering valuable insights andstrategies for controlling exciton emission in layered perovskite materialsthat is crucial for optoelectronics applications.

Phonon-bottleneck enhanced exciton emission in 2D perovskites