The ground exciton state of formamidinium lead bromide perovskite nanocrystals is a singlet dark state.
Journal
Nature materials
ISSN: 1476-4660
Titre abrégé: Nat Mater
Pays: England
ID NLM: 101155473
Informations de publication
Date de publication:
07 2019
07 2019
Historique:
received:
21
01
2019
accepted:
03
04
2019
pubmed:
16
5
2019
medline:
16
5
2019
entrez:
16
5
2019
Statut:
ppublish
Résumé
Lead halide perovskites have emerged as promising new semiconductor materials for high-efficiency photovoltaics, light-emitting applications and quantum optical technologies. Their luminescence properties are governed by the formation and radiative recombination of bound electron-hole pairs known as excitons, whose bright or dark character of the ground state remains unknown and debated. While symmetry analysis predicts a singlet non-emissive ground exciton topped with a bright exciton triplet, it has been predicted that the Rashba effect may reverse the bright and dark level ordering. Here, we provide the direct spectroscopic signature of the dark exciton emission in the low-temperature photoluminescence of single formamidinium lead bromide perovskite nanocrystals under magnetic fields. The dark singlet is located several millielectronvolts below the bright triplet, in fair agreement with an estimation of the long-range electron-hole exchange interaction. Nevertheless, these perovskites display an intense luminescence because of an extremely reduced bright-to-dark phonon-assisted relaxation.
Identifiants
pubmed: 31086320
doi: 10.1038/s41563-019-0364-x
pii: 10.1038/s41563-019-0364-x
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
717-724Commentaires et corrections
Type : CommentIn
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