Dynamics of Long-Lived Polarons in Poly(<i>para</i>-phenylene)-Type Ladder Polymers

W. Graupner; J. Partee; J. Shinar; G. Leising; U. Scherf

doi:10.1103/PhysRevLett.77.2033

Dynamics of Long-Lived Polarons in Poly(para-phenylene)-Type Ladder Polymers

W. Graupner, J. Partee, J. Shinar, G. Leising, and U. Scherf

Phys. Rev. Lett. 77, 2033 – Published 2 September 1996

Abstract

The X-band spin- $\frac{1}{2}$ photoluminescence-detected magnetic resonance of poly(para-phenylene)-type ladder polymer films and solutions are described. The photoluminescence-enhancing resonances are assigned to enhanced nonradiative recombination of long-lived polaron pairs, which are singlet exciton quenching centers. Their behavior is consistent with two distinct polaron lifetimes or a very broad distribution of lifetimes; in solutions they are $\approx 10$ longer than in films. Distinct lifetimes are discussed in relation to longer-lived intrachain interconjugation segment and shorter-lived interchain pairs.

Received 8 May 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.2033

Authors & Affiliations

W. Graupner¹, J. Partee², J. Shinar², G. Leising³, and U. Scherf³

¹Institut für Festkörperphysik, Technische Universität Graz, A-8010 Graz, Austria
²Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011
³Max Planck Institut für Polymerforschung, D-55128 Mainz, Germany