Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie International Edition Année : 2023

Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence

Résumé

We show that chiral Frenkel excitons yield intense circularly polarized luminescence with an intrinsic dissymmetry factor in emission glum as high as 0.08. This outstanding value is measured through thin films of cyanine J-aggregates that form twisted bundles. Our measurements, obtained by a Mueller polarization analysis, are artifact-free and reveal a quasi-perfect correlation between the dissymmetry factors in absorption, gabs , and in emission glum . We interpret the bisignate dissymmetry factors as the signature of a strong coupling between chiral Frenkel excitons longitudinally excited along the bundles. We further resolve by polarimetry analysis the split in energy between the excited states with a Davydov splitting as small as 28 meV. We finally show the anti-Kasha nature of the chiral emission bands with opposite optical chirality. These mirror-imaged emissive chiroptical features emerge from the structural rigidity of the bundles that preserves the ground- and excited-state chirality.
Fichier principal
Vignette du fichier
islandora_160359.pdf (1.24 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04018710 , version 1 (07-03-2023)

Identifiants

Citer

Minghao Li, Shahana Nizar, Sudipta Saha, Anoop Thomas, Stefano Azzini, et al.. Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence. Angewandte Chemie International Edition, 2023, 62 (6), ⟨10.1002/anie.202212724⟩. ⟨hal-04018710⟩
16 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More