Insight into the exciton fine structure, the role of phonons and depolarization effects in halide perovskite nanocrystals

Halide perovskite nanocrystals have been introduced in 2015 as a promising route to efficient light emitting devices, and more recently as potential single photon emitters. Their radiative recombinations are governed by excitons, but the bright or dark character of the ground state is debated.