Polarization of singlet and triplet excited states in a platinum-containing conjugated polymer

J. S. Wilson, R. J. Wilson, R. H. Friend, A. Köhler, M. K. Al-Suti, M. R A Al-Mandhary, M. S. Khan

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Abstract

We investigate the polarization of optical transitions associated with the singlet S1 and triplet T1 and Tn excited states in a uniaxially aligned platinum-containing conjugated polymer which contains a 2-methoxy-5-(2′-ethyl)-hexyloxy (MEH)-substituted phenyl ring. For the singlet S1 state, which is extended along the polymer chain, we find the corresponding absorption and emission to be polarized parallel to the chain as seen for other conjugated polymers. However, for the triplet excited states, we find that the emission from the highly localized T1 state has components both parallel and perpendicular to the polymer chain, while the absorption from T1 into the delocalized Tn state is polarized entirely parallel to the chain. We discuss this connection between the spatial extent of the excited state and the polarization of the associated optical transitions and consider how the spin-orbit coupling mechanism can influence the polarization of emission from the T1 state.

Original languageEnglish
Article number125206
Pages (from-to)1252061-1252066
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number12
Publication statusPublished - Mar 2003

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ASJC Scopus subject areas

  • Condensed Matter Physics

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