Journal article
Polarons in Ladder-Type Polymer Films; Recombination Channels and Electron−Phonon Coupling
The journal of physical chemistry. B, Vol.104(16), pp.3846-3850
04/27/2000
DOI: 10.1021/jp993370m
Abstract
We applied the photomodulation spectroscopy for probe-photon energies from 0.05 to 2.5 eV in films of ladder-type poly(p-phenylene) and identified a photoinduced absorption (PA) band related to triplet excitons and two correlated PA bands due to charged polarons. The low energy polaron band peaks at a relatively low photon energy of ∼0.1 eV, showing small polaronic relaxation energy. We employed photoinduced absorption-detected magnetic resonance spectroscopy to study the polaron recombination channels and found that spin 1/2 magnetic resonance enhances the bimolecular recombination of polarons to singlet byproducts (singlet excitons and bipolarons). However, it reduces polaron recombination to triplet byproducts, such as triplet excitons. The low-energy polaron PA shows antiresonances due to its overlap with Raman- and IR-active vibrations. The antiresonances spectrum is compared to the IR and Raman spectra and found to also contain modes that are silent in the latter spectra. © 2000 American Chemical Society.
Details
- Title: Subtitle
- Polarons in Ladder-Type Polymer Films; Recombination Channels and Electron−Phonon Coupling
- Creators
- M. Wohlgenannt - University of UtahC. P. An - University of UtahZ. V. Vardeny - University of Utah
- Resource Type
- Journal article
- Publication Details
- The journal of physical chemistry. B, Vol.104(16), pp.3846-3850
- DOI
- 10.1021/jp993370m
- ISSN
- 1520-6106
- eISSN
- 1520-5207
- Language
- English
- Date published
- 04/27/2000
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428824102771