Fluorescence Quenchers in Mixed Phase Polyfluorene Films

Ashu K. Bansal; Arvydas Ruseckas; Paul E. Shaw; Ifor D. W. Samuel

doi:10.1021/jp105545r

Fluorescence Quenchers in Mixed Phase Polyfluorene Films

Ashu K. Bansal, Arvydas Ruseckas, Paul E. Shaw, Ifor D. W. Samuel

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41 Citations (Scopus)

Abstract

Fluorescence quenching dynamics were studied in poly(9,9-dioctylfluorene) films with a wide range of beta-phase concentrations. Measurements of time-resolved fluorescence and fluorescence quantum yield showed that the radiative decay rate was independent of the beta phase content, whereas the nonrachative decay rate was found to be higher in beta-phase rich films. The trend was analyzed in terms of diffusion-mediated excitation energy transfer to quenchers. The concentration of fluorescence quenchers is found to be less than 0.01 % of the number of numeric: repeat units and independent of the fraction of the film in the beta phase. The results suggest that fluorescence quenching is predominantly by chemical defects rather than by excimer formation.

Original language	English
Pages (from-to)	17864-17867
Number of pages	4
Journal	Journal of Physical Chemistry C
Volume	114
Issue number	41
DOIs	https://doi.org/10.1021/jp105545r
Publication status	Published - 21 Oct 2010

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title = "Fluorescence Quenchers in Mixed Phase Polyfluorene Films",

abstract = "Fluorescence quenching dynamics were studied in poly(9,9-dioctylfluorene) films with a wide range of beta-phase concentrations. Measurements of time-resolved fluorescence and fluorescence quantum yield showed that the radiative decay rate was independent of the beta phase content, whereas the nonrachative decay rate was found to be higher in beta-phase rich films. The trend was analyzed in terms of diffusion-mediated excitation energy transfer to quenchers. The concentration of fluorescence quenchers is found to be less than 0.01 % of the number of numeric: repeat units and independent of the fraction of the film in the beta phase. The results suggest that fluorescence quenching is predominantly by chemical defects rather than by excimer formation.",

author = "Bansal, {Ashu K.} and Arvydas Ruseckas and Shaw, {Paul E.} and Samuel, {Ifor D. W.}",

year = "2010",

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doi = "10.1021/jp105545r",

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T1 - Fluorescence Quenchers in Mixed Phase Polyfluorene Films

AU - Bansal, Ashu K.

AU - Ruseckas, Arvydas

AU - Shaw, Paul E.

AU - Samuel, Ifor D. W.

PY - 2010/10/21

Y1 - 2010/10/21

N2 - Fluorescence quenching dynamics were studied in poly(9,9-dioctylfluorene) films with a wide range of beta-phase concentrations. Measurements of time-resolved fluorescence and fluorescence quantum yield showed that the radiative decay rate was independent of the beta phase content, whereas the nonrachative decay rate was found to be higher in beta-phase rich films. The trend was analyzed in terms of diffusion-mediated excitation energy transfer to quenchers. The concentration of fluorescence quenchers is found to be less than 0.01 % of the number of numeric: repeat units and independent of the fraction of the film in the beta phase. The results suggest that fluorescence quenching is predominantly by chemical defects rather than by excimer formation.

AB - Fluorescence quenching dynamics were studied in poly(9,9-dioctylfluorene) films with a wide range of beta-phase concentrations. Measurements of time-resolved fluorescence and fluorescence quantum yield showed that the radiative decay rate was independent of the beta phase content, whereas the nonrachative decay rate was found to be higher in beta-phase rich films. The trend was analyzed in terms of diffusion-mediated excitation energy transfer to quenchers. The concentration of fluorescence quenchers is found to be less than 0.01 % of the number of numeric: repeat units and independent of the fraction of the film in the beta phase. The results suggest that fluorescence quenching is predominantly by chemical defects rather than by excimer formation.

U2 - 10.1021/jp105545r

DO - 10.1021/jp105545r

M3 - Article

SN - 1932-7447

VL - 114

SP - 17864

EP - 17867

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 41

ER -

Fluorescence Quenchers in Mixed Phase Polyfluorene Films

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