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

A. T H Koch, D. Beljonne, N. T. Harrison, J. L. Brédas, N. Haylett, Rusli Daik, W. J. Feast, R. H. Friend

Research output: Contribution to journalArticle

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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
Pages (from-to)145-149
Number of pages5
JournalOptical Materials
Volume9
Issue number1-4
Publication statusPublished - Jan 1998
Externally publishedYes

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conjugation
Photoluminescence
Substitution reactions
substitutes
photoluminescence
Photodegradation
polymers
Polymers
Excited states
Light absorption
leaves
optical absorption
degradation
Derivatives
Degradation
Oxidation
oxidation
Molecules
rings
decay

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Koch, A. T. H., Beljonne, D., Harrison, N. T., Brédas, J. L., Haylett, N., Daik, R., ... Friend, R. H. (1998). The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties. Optical Materials, 9(1-4), 145-149.

The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties. / Koch, A. T H; Beljonne, D.; Harrison, N. T.; Brédas, J. L.; Haylett, N.; Daik, Rusli; Feast, W. J.; Friend, R. H.

In: Optical Materials, Vol. 9, No. 1-4, 01.1998, p. 145-149.

Research output: Contribution to journalArticle

Koch, ATH, Beljonne, D, Harrison, NT, Brédas, JL, Haylett, N, Daik, R, Feast, WJ & Friend, RH 1998, 'The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties', Optical Materials, vol. 9, no. 1-4, pp. 145-149.
Koch ATH, Beljonne D, Harrison NT, Brédas JL, Haylett N, Daik R et al. The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties. Optical Materials. 1998 Jan;9(1-4):145-149.
Koch, A. T H ; Beljonne, D. ; Harrison, N. T. ; Brédas, J. L. ; Haylett, N. ; Daik, Rusli ; Feast, W. J. ; Friend, R. H. / The effects of phenyl-di-substitution of PPV on its photophysical and photostability properties. In: Optical Materials. 1998 ; Vol. 9, No. 1-4. pp. 145-149.
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