Effect of interchain coupling on conducting polymer luminescence: excimers in derivatives of poly(phenylene vinylene)

M. W. Wu; E. M. Conwell

doi:10.1103/physrevb.56.r10060

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Effect of interchain coupling on conducting polymer luminescence: excimers in derivatives of poly(phenylene vinylene)

M. W. Wu·E. M. Conwell

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Abstract

Optical excitation of a chain in a polymer film may result in formation of an excimer, a superposition of on-chain excitons and charge-transfer excitons on the originally excited chain and a neighboring chain. The excimer emission is red-shifted compared to that of an on-chain exciton by an amount depending on the interchain coupling $t_\perp$. Setting up the excimer wavefunction and calculating the red shift, we determine average $t_\perp$ values, referred to a monomer, of 0.52 eV and 0.16 eV for poly(2,5-hexyloxy $p$-phenylene cyanovinylene), CN-PPV, and poly[2-methoxy, 5-(2'-ethyl-hexyloxy)-1, 4 p-phenylene vinylene], MEH-PPV, respectively, and use them to determine the effect of interchain distance on the emission.

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M. W. Wu, E. M. Conwell. 1997-08-21. Effect of interchain coupling on conducting polymer luminescence: excimers in derivatives of poly(phenylene vinylene). https://doi.org/10.1103/physrevb.56.r10060

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