Relaxation of excitons and charge carriers in polymers

Author

Meskers, S.C.J. ; Im, C. ; Bässler, H. ; Hübner, J. ; Östreich, M.

Author_Institution

Inst. of Phys. Chem., Philipps-Univ., Marburg, Germany

Volume

8

Issue

3

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

321

Lastpage

328

Abstract

In this paper various aspects of relaxation of optically generated excitations in random organic solids are discussed. Examples are spectral diffusion of excitons in organic glasses, or conjugated polymers, involving energy transfer within an inhomogeneously broadened dense manifold of chromophores, and charge carrier transport in random photoconductors. After an outline of the concept of time dependent random walks within an energetically and spatially disordered array of hopping sites, recent results on charge and exciton transport in π-conjugated systems such as conjugated polymers will be presented. The main emphasis will be on site-selective methods. Site selectivity, achieved by means of a spectrally tunable excitation source, is an unique opportunity to identify a subensemble of excitations which will be able to undergo subsequent relaxation probed by time-dependent spectroscopy

Keywords

conducting polymers; dielectric relaxation; excitons; hopping conduction; photoconductivity; polymers; π-conjugated systems; charge carrier transport; charge carriers; chromophores; conjugated polymers; energy transfer; excitons relaxation; inhomogeneously broadened dense manifold; organic glasses; polymers; random organic solids; random photoconductors; site selectivity; site-selective methods; spectrally tunable excitation source; Absorption; Charge carriers; Chemistry; Energy exchange; Excitons; Glass; Optical polymers; Photoconductivity; Solids; Spectroscopy;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.933338

Filename

933338