Optical excitations in transition metal containing poly-ynes

H. F. Wittmann, K. Fuhrmann, R. H. Friend, M. S. Khan, J. Lewis

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We have measured the optical properties of poly[trans(bis(tributylphosphine))platinum(1,4) phenylenediethynylene)]. In this polymer, conjugated phenylenediethynylene units are linked by square-planar coordinated platinum to form a linear chain. We consider that in contrast to hydrocarbon conjugated polymers, the presence of the heavy metal atom on the chain allows transitions between the singlet and triplet manifolds. We see π conjugation that extends through the metal sites. Strong singlet π-π* absorption peaks at 3.26 eV, and weaker triplet absorption peaks at 2.43 eV at room temperature. Strong photoluminescence from triplet to ground state peaks at 2.38 eV, and weak photolumiscence from the excited singlet peaks at 3.06 eV at low temperatures also see photoinduced absorption which peaks at 1.49 eV, and which shows the same temperature and temporal dependence as the strong luminescence, with a lifetime of 30 μsecs at 10 K. We associate this feature with a triplet to triplet transition. We consider that these measurements provide a direct probe of the exchange energy for the excitons which are primarily located on the π-conjugated section of the chain.

Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalSynthetic Metals
Volume55
Issue number1
DOIs
Publication statusPublished - Mar 15 1993

Fingerprint

Photoexcitation
Transition metals
transition metals
Conjugated polymers
Platinum
excitation
Hydrocarbons
Heavy Metals
platinum
Excitons
Temperature
Ground state
Heavy metals
Luminescence
Photoluminescence
Optical properties
Metals
polymers
Atoms
heavy metals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Optical excitations in transition metal containing poly-ynes. / Wittmann, H. F.; Fuhrmann, K.; Friend, R. H.; Khan, M. S.; Lewis, J.

In: Synthetic Metals, Vol. 55, No. 1, 15.03.1993, p. 56-61.

Research output: Contribution to journalArticle

Wittmann, HF, Fuhrmann, K, Friend, RH, Khan, MS & Lewis, J 1993, 'Optical excitations in transition metal containing poly-ynes', Synthetic Metals, vol. 55, no. 1, pp. 56-61. https://doi.org/10.1016/0379-6779(93)90909-G
Wittmann, H. F. ; Fuhrmann, K. ; Friend, R. H. ; Khan, M. S. ; Lewis, J. / Optical excitations in transition metal containing poly-ynes. In: Synthetic Metals. 1993 ; Vol. 55, No. 1. pp. 56-61.
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