title: Superradiance in molecular H aggregates.
abstract: Direct evidence of superradiance from an organic semiconductor (quaterthiophene) whose molecules are arranged in a H aggregate fashion, is reported. Time resolved photoluminescence measurements show a linear correlation between the radiative lifetime (tau(rad)) of the purely electronic exciton recombination and the inverse of the number (N(C)) of the coherently emitting dipoles, i.e., tau(rad) proportional, variant 1/N(C). These data support the recently developed theoretical models describing the optical properties of H aggregates of rodlike molecules with a nonvanishing component of the perpendicular molecular transition dipole moment.
authors.affiliation: INFM and Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, via Cozzi 53, I-20125 Milano, Italy. meinardi@mater.unimib.it
authors.forename: F
authors.initials: F
authors.lastname: Meinardi
authors.forename: M
authors.initials: M
authors.lastname: Cerminara
authors.forename: A
authors.initials: A
authors.lastname: Sassella
authors.forename: R
authors.initials: R
authors.lastname: Bonifacio
authors.forename: R
authors.initials: R
authors.lastname: Tubino