Geometry-Dependent Electronic Properties of Highly Fluorescent Conjugated Molecules

Shu-Chun Yang; W. Graupner; S. Guha; P. Puschnig; C. Martin; H. R. Chandrasekhar; M. Chandrasekhar; G. Leising; C. Ambrosch-Draxl; U. Scherf

doi:10.1103/PhysRevLett.85.2388

Geometry-Dependent Electronic Properties of Highly Fluorescent Conjugated Molecules

Shu-Chun Yang, W. Graupner, S. Guha, P. Puschnig, C. Martin, H. R. Chandrasekhar, M. Chandrasekhar, G. Leising, C. Ambrosch-Draxl, and U. Scherf

Phys. Rev. Lett. 85, 2388 – Published 11 September 2000

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.

Received 19 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.85.2388

Authors & Affiliations

Shu-Chun Yang¹, W. Graupner², S. Guha³, P. Puschnig⁴, C. Martin¹, H. R. Chandrasekhar¹, M. Chandrasekhar¹, G. Leising⁵, C. Ambrosch-Draxl⁴, and U. Scherf⁶

¹Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211
²Department of Physics, Virginia Tech, Blacksburg, Virginia 24061-0435
³Department of Physics, Marquette University, Milwaukee, Wisconsin 53201-1881
⁴Institut für Theoretische Physik, Universität Graz, Graz, A 8010 Austria
⁵Institut für Festkörperphysik, Technische Universität Graz, Graz, A 8010 Austria
⁶Max-Planck-Institut für Polymerforschung, Mainz, D 55128, Germany