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Photoinduced charge transfer in poly(phenylene‐vinylene) and its derivatives
Author(s) -
Conwell Esther M.
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971160106
Subject(s) - polaron , exciton , phenylene , excitation , hamiltonian (control theory) , materials science , photon , absorption (acoustics) , photochemistry , two photon absorption , molecular physics , atomic physics , optics , physics , chemistry , condensed matter physics , polymer , electron , quantum mechanics , mathematical optimization , laser , mathematics , composite material
Photoinduced absorption measurements on poly(phenylenevinylene), PPV, or its derivatives, illuminated with photons of energy past the absorption edge revealed that some percentage of the photons create a long‐lived excitation rather than the expected excitons. We present the evidence that these excitations are polaron pairs, which are essentially excimers. The reasons why this percentage varies from sample to sample are discussed. Also discussed are the reasons why polaron pairs in some derivatives of PPV emit light while in others they do not. Calculations with a relatively simple Hamiltonian can account well for the peaks in the photoinduced absorption produced by these pairs.