Circularly Polarized Luminescence Without External Magnetic Fields from Individual CsPbBr₃ Perovskite Quantum Dots.

ABSTRACT: Lead halide perovskite quantum dots (QDs), the latest generation of the colloidal QD family, exhibit outstanding optical properties, which are now exploited as both classical and quantum light sources. Most of their rather exceptional properties are related to the peculiar exciton fine-structure of band-edge states, which can support unique bright triplet excitons. The degeneracy of the bright triplet excitons is lifted with energetic splitting in the order of millielectronvolts, which can be resolved by the photoluminescence (PL) measurements of single QDs at cryogenic temperatures. Each bright exciton fine-structure-state (FSS) exhibits a dominantly linear polarization, in line with several theoretical models based on the sole crystal field, exchange interaction, and shape anisotropy. He

SUBMITTER: Oddi V 

PROVIDER: S-EPMC11223489 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature