title: Dimensionality effects on the luminescence properties of hBN.
abstract: Cathodoluminescence (CL) experiments at low temperature have been undertaken on various bulk and exfoliated hexagonal boron nitride (hBN) samples. Different bulk crystals grown from different synthesis methods have been studied. All of them present the same so-called S series in the 5.6-6 eV range, proving its intrinsic character. Luminescence spectra of flakes containing 100 down to 6 layers have been recorded. Strong modifications in the same UV range are observed and discussed within the general framework of 2D exciton properties in lamellar crystals.
authors.affiliation: Laboratoire d'Etude des Microstructures, ONERA-CNRS, Université Paris-Saclay, 29 avenue de la Division Leclerc, BP 72, 92322 Châtillon Cedex, France. annick.loiseau@onera.fr.
authors.forename: Léonard
authors.initials: L
authors.lastname: Schué
authors.forename: Bruno
authors.initials: B
authors.lastname: Berini
authors.forename: Andreas C
authors.initials: AC
authors.lastname: Betz
authors.forename: Bernard
authors.initials: B
authors.lastname: Plaçais
authors.forename: François
authors.initials: F
authors.lastname: Ducastelle
authors.forename: Julien
authors.initials: J
authors.lastname: Barjon
authors.forename: Annick
authors.initials: A
authors.lastname: Loiseau