Collective fluorescence of graphene quantum dots on a surface
Year: 2026
Authors: Levy-Falk H., Sarkar S., Huynh TT., Medina-Lopez D., Hurley L., Capelle O., Bouttemy M., Trippy-Allard G., Campidelli S., Rondin L., Cassette E., Deleporte E., Lauret JS.
Autors Affiliation: Univ Paris Saclay, Lab LuMIn, Cent Supelec, CNRS,ENS Paris Saclay,LuMIn, F-91190 Gif Sur Yvette, France; Natl Inst Opt CNR INO, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Paris Saclay, CEA, NIMBE, LICSEN, Gif Sur Yvette, France; Univ Paris Saclay, Inst Lavoisier Versailles, UVSQ, CNRS ,UMR 8180, 45 Ave Etats Unis, F-78035 Versailles, France.
Abstract: This study explores the organization of graphene quantum dots on the surface of monocrystalline halide perovskite. We show that graphene quantum dots tend to aggregate on the surface of perovskite, unlike in solution or on other substrates, even at a very low concentration of the initial solution that should yield single-molecule samples. Spectral analysis on small clusters shows a back-and-forth dynamical transition between an uncoupled, monomer-like state and an excimer state. Following this dance between states,a drastic one-way increase in fluorescence intensity, combined with a shortening of the excited state lifetime, has been observed on some clusters. This behavior is related to the emission of a collective state that may be a consequence of the dynamical organization of graphene quantum dots under illumination on the surface of the perovskite.
Journal/Review: OPTICAL MATERIALS EXPRESS
Volume: 16 (7) Pages from: 2032 to: 2042
More Information: Agence de l’innovation de Defense; Agence Nationale de la Recherche (ANR-19-GRF1-0002-01, ANR-22-CE47-0001-03, ANR-21-CE09-0025, ANR-19-CE09-0031-01, ANR-10-LABX-0035, ANR-24-CE50-2579 (Project SPOIR)); Deutsche Forschungsgemeinschaft (DFG 437130745).KeyWords: PerovskiteDOI: 10.1364/OME.583290
