Publication: 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
Issued Date
2010-12-01
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20927673
15985032
15985032
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2-s2.0-79951798757
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Mahidol University
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SCOPUS
Bibliographic Citation
Macromolecular Research. Vol.18, No.12 (2010), 1182-1190
Suggested Citation
Rakchart Traiphol, Thanutpon Pattanatornchai, Toemsak Srikhirin, Teerakiat Kerdcharoen, Tanakorn Osotchan 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. Macromolecular Research. Vol.18, No.12 (2010), 1182-1190. doi:10.1007/s13233-010-1201-x Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/28877
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Title
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 (λ̃525 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.