Hostname: page-component-77c89778f8-m8s7h Total loading time: 0 Render date: 2024-07-19T09:27:50.905Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effects of Structural Disorder on the Luminescence Quenching in Poly(phenylene vinylene)

Published online by Cambridge University Press:  15 February 2011

Daniel Moses ,
Roland Schmechel  and
Alan J. Heeger
Daniel Moses
Affiliation:
Institute for Polymers and Organic Solids, University of California at Santa Barbara Santa Barbara California 93106, USA
Roland Schmechel
Affiliation:
Institute for Polymers and Organic Solids, University of California at Santa Barbara Santa Barbara California 93106, USA
Alan J. Heeger
Affiliation:
Institute for Polymers and Organic Solids, University of California at Santa Barbara Santa Barbara California 93106, USA
Get access

Abstract

Luminescence quenching experiments on oriented and drop-cast poly(phenylene vinylene), (PPV), films identify the excitons in these polymer films as Wannier-Mott excitons. The data are interpreted in terms of a distribution of exciton binding energies (Eb). We find that the width of this distribution is well correlated with the degree of structural disorder. The relatively small mean EbEb, approximately 60 meV, results in field-induced exciton disociation that limits the quantum efficiency obtained from polymer-based light emitting diodes (PLEDs) which typically are operated at applied fields of 106 V/cm or greater where the field-induced exciton disociation is significant. We present data and analysis that support these conclusions, as well as a discussion on the implications of our findings on polymer-based display technology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L5.9
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.1. Moses, D. et al, PNAS 98(24), 13496 (2001).Google Scholar
2. The Nature of Photoexcitations in Conjugated Polymers, eds. Sariciftci, N. S. (World Scientific Publ., Singapore, 1997).Google Scholar
3. Chandross, M. et al, Phys. Rev. B 50(19), 14702 (1994).Google Scholar
4. Harrison, M.G., Gruner, J., & Spencer, G. C. W., Phys. Rev. B 55, 7831 (1997).Google Scholar
5. This question was raised recently by Bässler, H. in a talk at the ICSM'2002 Conference, (Shanghai, China).Google Scholar
6. Kirova, N., Brazovskii, S.,& Bishop, A. R., Synth. Met. 100(1), 29 (1999).Google Scholar
7. Comoretto, D. et al, Chem. Phys. Lett. 289, 1 (1998).Google Scholar
8. Kersting, R. et al, Phys. Rev. Lett. 73, 1440 (1994).Google Scholar
9. Moses, D., Okumoto, H., Lee, C. H., Heeger, A. J., Phys. Rev B 54, 4748 (1996).Google Scholar