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Effects of steric anthracene moieties and keto defects on photophysics and color stability of poly(9,9-di(2-ethylhexyl)fluorene-stat-anthracene) in different local environments

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Abstract

UV/vis absorption and photoluminescence (PL) spectroscopy were used to examine the photophysical properties of statistical copolymers, poly(9,9-di(2-ethylhexyl)fluorene-stat-anthracene), with the mole ratio of the anthracene group ranging from 0 to 20%. The incorporation of the anthracene group into the conjugated backbone of the polyfluorene affected the PL pattern and quantum yield of the isolated chain in a dilute solution. An investigation of the photophysical properties in solvent-nonsolvent system revealed the formation of low-energy non-emissive and emissive aggregates. The quantity of these aggregated species depends significantly on the mole ratio of anthracene group in the polymer backbone. The existence of only 5 mol% of anthracene in the copolymer causes significant suppression of the well-known green emission (λ∼525 nm). However, a large quantity of non-emissive aggregates indicated by the red-shift peak at ∼415 nm in absorption spectra still formed. Increasing the mole ratio of the anthracene group to 20% suppressed both types of aggregates. Measurements of the absorption and PL spectra in the thin films showed consistent results. Although annealing of the homopolymer polyfluorene films at 150 °C in a vacuum oven caused a drastic increase in green emission, only a slight change was detected in the PL spectra of the copolymers. The presence of oxygen during annealing promoted the green emission of the polymer films.

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Authors and Affiliations

  1. Laboratory of Advanced Polymers and Nanomaterials, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand

    Rakchart Traiphol & Thanutpon Pattanatornchai

  2. Center of Nanoscience and Nanotechnology, Faculty of Science, NANOTEC Center of Excellence at Mahidol University, Rama 6 Road, Ratchathewi, Bangkok, 10400, Thailand

    Rakchart Traiphol

  3. Department of Physics, Faculty of Science, Mahidol University, Rama 6 Road, Ratchathewi, Bangkok, 10400, Thailand

    Toemsak Srikhirin, Teerakiat Kerdcharoen & Tanakorn Osotchan

Authors
  1. Rakchart Traiphol
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  2. Thanutpon Pattanatornchai
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  3. Toemsak Srikhirin
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  5. Tanakorn Osotchan
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Correspondence to Rakchart Traiphol.

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Traiphol, R., Pattanatornchai, T., Srikhirin, T. et al. Effects of steric anthracene moieties and keto defects on photophysics and color stability of poly(9,9-di(2-ethylhexyl)fluorene-stat-anthracene) in different local environments. Macromol. Res. 18, 1182–1190 (2010). https://doi.org/10.1007/s13233-010-1201-x

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  • DOI: https://doi.org/10.1007/s13233-010-1201-x

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