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The ground exciton state of formamidinium lead bromide perovskite nanocrystals is a singlet dark state

hal.structure.identifierLaboratoire Photonique, Numérique et Nanosciences [LP2N]
dc.contributor.authorTAMARAT, Philippe
hal.structure.identifierSwiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
dc.contributor.authorBODNARCHUK, Maryna
hal.structure.identifierLaboratoire Photonique, Numérique et Nanosciences [LP2N]
dc.contributor.authorTREBBIA, Jean-Baptiste
hal.structure.identifierSwiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
dc.contributor.authorERNI, Rolf
hal.structure.identifierEidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] [ETH Zürich]
dc.contributor.authorKOVALENKO, Maksym
hal.structure.identifierInstitut des Fonctions Optiques pour les Technologies de l'informatiON [FOTON]
dc.contributor.authorEVEN, Jacky
hal.structure.identifierLaboratoire Photonique, Numérique et Nanosciences [LP2N]
dc.contributor.authorLOUNIS, Brahim
dc.date.accessioned2023-05-12T10:47:38Z
dc.date.available2023-05-12T10:47:38Z
dc.date.issued2019-05-13
dc.identifier.issn1476-1122
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/181742
dc.description.abstractEnLead 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.
dc.language.isoen
dc.publisherNature Publishing Group
dc.title.enThe ground exciton state of formamidinium lead bromide perovskite nanocrystals is a singlet dark state
dc.typeArticle de revue
dc.identifier.doi10.1038/s41563-019-0364-x
dc.subject.halPhysique [physics]
bordeaux.journalNature Materials
bordeaux.page717-724
bordeaux.volume18
bordeaux.hal.laboratoriesLaboratoire Photonique, Numérique et Nanosciences (LP2N) - UMR 5298*
bordeaux.issue7
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-02130647
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02130647v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nature%20Materials&rft.date=2019-05-13&rft.volume=18&rft.issue=7&rft.spage=717-724&rft.epage=717-724&rft.eissn=1476-1122&rft.issn=1476-1122&rft.au=TAMARAT,%20Philippe&BODNARCHUK,%20Maryna&TREBBIA,%20Jean-Baptiste&ERNI,%20Rolf&KOVALENKO,%20Maksym&rft.genre=article


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