The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties

A. T.H. Koch*, D. Beljonne, N. T. Harrison, Jean-Luc Bredas, N. Haylett, R. Daik, W. J. Feast, R. H. Friend

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We present measurements of photoluminescence (PL) and optical absorption of the phenylated PPV (poly(p-phenylene vinylene)) derivative poly(1,3-phenylene diphenyl-vinylene) (m-PPV-DP) and the model compound tetraphenylethylene (TPE). We also assess the effect of the di-phenylsubstitution in both m-PPV-DP and PDPV (poly-(4,4′-diphenylene diphenylvinylene)) on their photostability. Our work confirms that the meta-link in m-PPV-DP breaks the conjugation and leaves the polymer with a longest fully conjugated unit identical to the molecule TPE. This allows to transfer our quantum chemical modelling results for TPE to m-PPV-DP and to show that the photophysical properties of the polymer are controlled by ring-torsional relaxation of the excited states rather than by effects of chain-extended conjugation. The UV-photodegradation is shown to be slowed down significantly by the phenylation in comparison to PPV as is evident from the measurements of the PL decay. We show by means of FTIR studies that the degradation is an oxidation process.

Original languageEnglish (US)
Pages (from-to)145-149
Number of pages5
JournalOptical Materials
Volume9
Issue number1-4
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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