title: Phonon line emission revealed by self-assembly of colloidal nanoplatelets.
abstract: We show that colloidal nanoplatelets can self-assemble to form a 1D superlattice. When self-assembled, an additional emission line appears in the photoluminescence spectrum at low temperatures. This emission line is a collective effect, greatly enhanced when the NPLs are self-assembled. It is attributed to the longitudinal optical (LO) phonon replica of the band-edge exciton, and its presence in self-assembled nanoplatelets is explained using a model based on an efficient photons reabsorption between neighboring nanoplatelets. The presence of phonon replica at low temperatures in ensemble measurements suggests the possibility to design a laser, based on self-assembled nanoplatelets.
authors: Laboratoire de Physique et d'Etude des Matériaux, CNRS, Université Pierre et Marie Curie, ESPCI, 10 rue Vauquelin, 75005, Paris, France.
authors: Mickaël D
authors: MD
authors: Tessier
authors: Louis
authors: L
authors: Biadala
authors: Cécile
authors: C
authors: Bouet
authors: Sandrine
authors: S
authors: Ithurria
authors: Benjamin
authors: B
authors: Abecassis
authors: Benoit
authors: B
authors: Dubertret
mesh_terms: D003102:Colloids / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D017785:Photons; D012542:Scattering, Radiation
chemical_list: D003102:Colloids