title: Geometry-dependent electronic properties of highly fluorescent conjugated molecules
abstract: We present a combined experimental/theoretical study of the electronic properties of conjugated para-phenylene type molecules under high pressure up to 80 kbar. Pressure is used as a tool to vary the molecular geometry and intermolecular interaction. The influence of the latter two on singlet and triplet excitons as well as polarons is monitored via optical spectroscopy. We have performed band structure calculations for the planar poly(para-phenylene) and calculated the dielectric function. By varying the intermolecular distances and the length of the polymer repeat unit the observed pressure effects can be explained.
authors.affiliation: Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA.
authors.initials: SC
authors.lastname: Yang
authors.initials: W
authors.lastname: Graupner
authors.initials: S
authors.lastname: Guha
authors.initials: P
authors.lastname: Puschnig
authors.initials: C
authors.lastname: Martin
authors.initials: HR
authors.lastname: Chandrasekhar
authors.initials: M
authors.lastname: Chandrasekhar
authors.initials: G
authors.lastname: Leising
authors.initials: C
authors.lastname: Ambrosch-Draxl
authors.initials: U
authors.lastname: Scherf