Ultrafast depolarization of the fluorescence in a conjugated polymer

A  Ruseckas; P  Wood; I D W  Samuel; G R  Webster; W J  Mitchell; P L  Burn; V  Sundstrom

doi:10.1103/PhysRevB.72.115214

Ultrafast depolarization of the fluorescence in a conjugated polymer

A Ruseckas, P Wood, I D W Samuel, G R Webster, W J Mitchell, P L Burn, V Sundstrom

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of the extent of pi electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by similar to 30 degrees on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.

Original language	English
Number of pages	5
Journal	Physical Review. B, Condensed matter and materials physics
Volume	72
DOIs	https://doi.org/10.1103/PhysRevB.72.115214
Publication status	Published - Sept 2005

Keywords

PHENYLENE VINYLENE OLIGOMERS
MEH-PPV
BROKEN CONJUGATION
OPTICAL-PROPERTIES
LOW-TEMPERATURE
ENERGY-TRANSFER
SPECTRA
ABSORPTION
SPECTROSCOPY
PHOTOPHYSICS

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10.1103/PhysRevB.72.115214

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title = "Ultrafast depolarization of the fluorescence in a conjugated polymer",

abstract = "The effect of the extent of pi electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by similar to 30 degrees on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.",

keywords = "PHENYLENE VINYLENE OLIGOMERS, MEH-PPV, BROKEN CONJUGATION, OPTICAL-PROPERTIES, LOW-TEMPERATURE, ENERGY-TRANSFER, SPECTRA, ABSORPTION, SPECTROSCOPY, PHOTOPHYSICS",

author = "A Ruseckas and P Wood and Samuel, {I D W} and Webster, {G R} and Mitchell, {W J} and Burn, {P L} and V Sundstrom",

year = "2005",

month = sep,

doi = "10.1103/PhysRevB.72.115214",

language = "English",

volume = "72",

journal = "Physical Review. B, Condensed matter and materials physics",

issn = "1098-0121",

publisher = "American Physical Society",

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T1 - Ultrafast depolarization of the fluorescence in a conjugated polymer

AU - Ruseckas, A

AU - Wood, P

AU - Samuel, I D W

AU - Webster, G R

AU - Mitchell, W J

AU - Burn, P L

AU - Sundstrom, V

PY - 2005/9

Y1 - 2005/9

N2 - The effect of the extent of pi electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by similar to 30 degrees on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.

AB - The effect of the extent of pi electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by similar to 30 degrees on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.

KW - PHENYLENE VINYLENE OLIGOMERS

KW - MEH-PPV

KW - BROKEN CONJUGATION

KW - OPTICAL-PROPERTIES

KW - LOW-TEMPERATURE

KW - ENERGY-TRANSFER

KW - SPECTRA

KW - ABSORPTION

KW - SPECTROSCOPY

KW - PHOTOPHYSICS

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U2 - 10.1103/PhysRevB.72.115214

DO - 10.1103/PhysRevB.72.115214

M3 - Article

SN - 1098-0121

VL - 72

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

ER -

Ultrafast depolarization of the fluorescence in a conjugated polymer

Abstract

Keywords

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