The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)

Marc Sims; Marilu Ariu; Aristidis Asimakis; Mattijs Koeberg; Mathias Stouff; Mark Fox; Donal D.C. Bradley

doi:10.1117/12.506340

The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)

Marc Sims, Marilu Ariu, Aristidis Asimakis, Mattijs Koeberg, Mathias Stouff, Mark Fox, Donal D.C. Bradley

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Scopus citations

Abstract

We report systematic measurements of the evolution of the emission characteristics of PFO whilst undergoing photo-oxidation. Pure PFO and highly diluted PFO/polystyrene blended films were prepared for the studies by spin-coating. Each film was oxidised by exposure to the 351 nm line of a cw Ar+ laser. Both the kinetics of the various spectral components and the photoluminescence intensity for each film was monitored as a function of oxidation time and their respective behaviours were compared. Our results demonstrate that there is a strong tendency for singlet intrachain excitons initially created on pristine PFO segments to migrate to the fluorenone moieties produced by photo-oxidation. However, we conclusively show that emission from states localised at these defect sites cannot account for the appearance of the broad green emission band (g-band) that is well-known to occur in degraded polyfluorenes. Instead, it is shown that the g-band must emanate from interchain states that are formed after energy has been transferred to the fluorenone moieties (either via energy transfer from non-defective PFO segments or by direct excitation).

Original language	English (US)
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering
DOIs	https://doi.org/10.1117/12.506340
State	Published - May 3 2004
Externally published	Yes

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title = "The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)",

abstract = "We report systematic measurements of the evolution of the emission characteristics of PFO whilst undergoing photo-oxidation. Pure PFO and highly diluted PFO/polystyrene blended films were prepared for the studies by spin-coating. Each film was oxidised by exposure to the 351 nm line of a cw Ar+ laser. Both the kinetics of the various spectral components and the photoluminescence intensity for each film was monitored as a function of oxidation time and their respective behaviours were compared. Our results demonstrate that there is a strong tendency for singlet intrachain excitons initially created on pristine PFO segments to migrate to the fluorenone moieties produced by photo-oxidation. However, we conclusively show that emission from states localised at these defect sites cannot account for the appearance of the broad green emission band (g-band) that is well-known to occur in degraded polyfluorenes. Instead, it is shown that the g-band must emanate from interchain states that are formed after energy has been transferred to the fluorenone moieties (either via energy transfer from non-defective PFO segments or by direct excitation).",

author = "Marc Sims and Marilu Ariu and Aristidis Asimakis and Mattijs Koeberg and Mathias Stouff and Mark Fox and Bradley, {Donal D.C.}",

note = "Generated from Scopus record by KAUST IRTS on 2019-11-27",

year = "2004",

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doi = "10.1117/12.506340",

language = "English (US)",

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T1 - The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)

AU - Sims, Marc

AU - Ariu, Marilu

AU - Asimakis, Aristidis

AU - Koeberg, Mattijs

AU - Stouff, Mathias

AU - Fox, Mark

AU - Bradley, Donal D.C.

N1 - Generated from Scopus record by KAUST IRTS on 2019-11-27

PY - 2004/5/3

Y1 - 2004/5/3

N2 - We report systematic measurements of the evolution of the emission characteristics of PFO whilst undergoing photo-oxidation. Pure PFO and highly diluted PFO/polystyrene blended films were prepared for the studies by spin-coating. Each film was oxidised by exposure to the 351 nm line of a cw Ar+ laser. Both the kinetics of the various spectral components and the photoluminescence intensity for each film was monitored as a function of oxidation time and their respective behaviours were compared. Our results demonstrate that there is a strong tendency for singlet intrachain excitons initially created on pristine PFO segments to migrate to the fluorenone moieties produced by photo-oxidation. However, we conclusively show that emission from states localised at these defect sites cannot account for the appearance of the broad green emission band (g-band) that is well-known to occur in degraded polyfluorenes. Instead, it is shown that the g-band must emanate from interchain states that are formed after energy has been transferred to the fluorenone moieties (either via energy transfer from non-defective PFO segments or by direct excitation).

AB - We report systematic measurements of the evolution of the emission characteristics of PFO whilst undergoing photo-oxidation. Pure PFO and highly diluted PFO/polystyrene blended films were prepared for the studies by spin-coating. Each film was oxidised by exposure to the 351 nm line of a cw Ar+ laser. Both the kinetics of the various spectral components and the photoluminescence intensity for each film was monitored as a function of oxidation time and their respective behaviours were compared. Our results demonstrate that there is a strong tendency for singlet intrachain excitons initially created on pristine PFO segments to migrate to the fluorenone moieties produced by photo-oxidation. However, we conclusively show that emission from states localised at these defect sites cannot account for the appearance of the broad green emission band (g-band) that is well-known to occur in degraded polyfluorenes. Instead, it is shown that the g-band must emanate from interchain states that are formed after energy has been transferred to the fluorenone moieties (either via energy transfer from non-defective PFO segments or by direct excitation).

UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.506340

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U2 - 10.1117/12.506340

DO - 10.1117/12.506340

M3 - Conference contribution

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -

The interchain origin of the green emission band in oxidised poly(9,9-dioctylfluorene) (PFO)

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