The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
26 Nov 2020
26 Nov 2020
Historique:
received:
24
07
2020
accepted:
27
10
2020
entrez:
27
11
2020
pubmed:
28
11
2020
medline:
28
11
2020
Statut:
epublish
Résumé
Cesium lead halide perovskites exhibit outstanding optical and electronic properties for a wide range of applications in optoelectronics and for light-emitting devices. Yet, the physics of the band-edge exciton, whose recombination is at the origin of the photoluminescence, is not elucidated. Here, we unveil the exciton fine structure of individual cesium lead iodide perovskite nanocrystals and demonstrate that it is governed by the electron-hole exchange interaction and nanocrystal shape anisotropy. The lowest-energy exciton state is a long-lived dark singlet state, which promotes the creation of biexcitons at low temperatures and thus correlated photon pairs. These bright quantum emitters in the near-infrared have a photon statistics that can readily be tuned from bunching to antibunching, using magnetic or thermal coupling between dark and bright exciton sublevels.
Identifiants
pubmed: 33243976
doi: 10.1038/s41467-020-19740-7
pii: 10.1038/s41467-020-19740-7
pmc: PMC7691346
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
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