Measuring the size of excitons on isolated phenylene-vinylene chains: From dimers to polymers | Zendy

Xinming Li | Zendy; Jacob J. Piet | Zendy; Bas Wegewijs | Zendy; Kläus Müllen | Zendy; Jurjen Wildeman | Zendy; Georges Hadziioannou | Zendy; John M. Warman | Zendy

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Measuring the size of excitons on isolated phenylene-vinylene chains: From dimers to polymers

Author(s) -

Xinming Li,

Jacob J. Piet,

Bas Wegewijs,

Kläus Müllen,

Jurjen Wildeman,

Georges Hadziioannou,

John M. Warman

Publication year - 2000

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.62.1489

Subject(s) - polarizability , poly(p phenylene vinylene) , materials science , phenylene , polymer , exciton , excited state , relaxation (psychology) , dimer , dielectric , delocalized electron , crystallography , polymer chemistry , molecular physics , condensed matter physics , atomic physics , chemistry , nuclear magnetic resonance , physics , molecule , organic chemistry , conjugated system , composite material , psychology , social psychology , optoelectronics

We have determined the excess polarizability of the relaxed first excited-singlet-state S1 on isolated chains of phenylene-vinylene oligomers and polymers by measuring the transient change in the microwave dielectric constant that occurs on flash photolysis of dilute solutions. The isotropic value of the excess polarizability volume, Da8(S1), increases from 250 A 3 for a dimer to 960 A 3 for an octamer, and 1600 A 3 for high molecular weight polymers. The value for the isolated polymer is close to that found for the unrelaxed S1 state in electroabsorption ~Stark effect! measurements on solid samples of poly~phenylene-vinylene!, indicating that exciton delocalization is not strongly influenced by either post-excitation relaxation of the polymer backbone geometry, or by interchain interactions.

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