Polarized Superradiance from CsPbBr₃ Quantum Dot Superlattice with Controlled Interdot Electronic Coupling.

ABSTRACT: Cooperative emission of photons from an ensemble of quantum dots (QDs) as superradiance can arise from the electronically coupled QDs with a coherent emitting excited state. This contrasts with superfluorescence (Dicke superradiance), where the cooperative photon emission requires a buildup of coherence in an ensemble of incoherently excited QDs via their coupling to a common radiation mode. In perovskite QDs, superradiance has been rarely observed, unlike superfluorescence, due to the challenge in QD electronic coupling. Here, we report superradiance with a very narrow linewidth (<5 meV) and a large redshift (∼200 meV) from the strongly coupled CsPbBr₃ QD superlattice achieved through the combination of quantum confinement and ligand engineering. The superradiance is polarized

SUBMITTER: Luo L 

PROVIDER: S-EPMC12007084 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature