Photoexcitation in poly(p-phenylene vinylene)

D. D.C. Bradley; N. F. Colaneri; R. H. Friend

doi:10.1016/0379-6779(89)90286-5

Photoexcitation in poly(p-phenylene vinylene)

D. D.C. Bradley, N. F. Colaneri, R. H. Friend

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25 Scopus citations

Abstract

We contrast the generation and decay of charged and neutral photoexcitations in oriented samples of poly(p-phenylene vinylene). Charge separation is the result of interchain electron motion and is detected through measurement of photoinduced absorption (PA). In contrast, photoexcitation within a single chain results in a short-lived neutral polaron-exciton which is observed by its luminescence if it decays radiatively. We find big differences between the bipolarons detected in the PA experiments (which are extensively delocalized along the chain and are w]eakly confined) and the polaron-excitons (which show very strong confinement and a small Stokes' shift in luminescence). This is not explained within one-electron theories for polaron formation and is, we consider, firm evidence for the importance of Coulomb interactions. © 1989.

Original language	English (US)
Journal	Synthetic Metals
Volume	29
Issue number	1
DOIs	https://doi.org/10.1016/0379-6779(89)90286-5
State	Published - Mar 7 1989
Externally published	Yes

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title = "Photoexcitation in poly(p-phenylene vinylene)",

abstract = "We contrast the generation and decay of charged and neutral photoexcitations in oriented samples of poly(p-phenylene vinylene). Charge separation is the result of interchain electron motion and is detected through measurement of photoinduced absorption (PA). In contrast, photoexcitation within a single chain results in a short-lived neutral polaron-exciton which is observed by its luminescence if it decays radiatively. We find big differences between the bipolarons detected in the PA experiments (which are extensively delocalized along the chain and are w]eakly confined) and the polaron-excitons (which show very strong confinement and a small Stokes' shift in luminescence). This is not explained within one-electron theories for polaron formation and is, we consider, firm evidence for the importance of Coulomb interactions. {\textcopyright} 1989.",

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T1 - Photoexcitation in poly(p-phenylene vinylene)

AU - Bradley, D. D.C.

AU - Colaneri, N. F.

AU - Friend, R. H.

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PY - 1989/3/7

Y1 - 1989/3/7

N2 - We contrast the generation and decay of charged and neutral photoexcitations in oriented samples of poly(p-phenylene vinylene). Charge separation is the result of interchain electron motion and is detected through measurement of photoinduced absorption (PA). In contrast, photoexcitation within a single chain results in a short-lived neutral polaron-exciton which is observed by its luminescence if it decays radiatively. We find big differences between the bipolarons detected in the PA experiments (which are extensively delocalized along the chain and are w]eakly confined) and the polaron-excitons (which show very strong confinement and a small Stokes' shift in luminescence). This is not explained within one-electron theories for polaron formation and is, we consider, firm evidence for the importance of Coulomb interactions. © 1989.

AB - We contrast the generation and decay of charged and neutral photoexcitations in oriented samples of poly(p-phenylene vinylene). Charge separation is the result of interchain electron motion and is detected through measurement of photoinduced absorption (PA). In contrast, photoexcitation within a single chain results in a short-lived neutral polaron-exciton which is observed by its luminescence if it decays radiatively. We find big differences between the bipolarons detected in the PA experiments (which are extensively delocalized along the chain and are w]eakly confined) and the polaron-excitons (which show very strong confinement and a small Stokes' shift in luminescence). This is not explained within one-electron theories for polaron formation and is, we consider, firm evidence for the importance of Coulomb interactions. © 1989.

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U2 - 10.1016/0379-6779(89)90286-5

DO - 10.1016/0379-6779(89)90286-5

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SN - 0379-6779

VL - 29

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1

ER -

Photoexcitation in poly(p-phenylene vinylene)

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