Concentration-dependence of photoluminescence properties in polythiophene diluted in an inactive polymer matrix

Kanemoto, Katsuichi; Shishido, Makoto; Sudo, Tatsuji; Akai, Ichiro; Hashimoto, Hideki; Karasawa, T.

doi:10.1016/j.cplett.2004.12.100

Cited by 18 publications

(19 citation statements)

References 12 publications

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“…However, fluorescence quantum yields are very low for all films: they are typically of the order of 0.005, ranging between roughly 0.0025 and 0.008 for different samples and excitation wavelengths. Such values are very close to the quantum yield attributed to inter-chain aggregates of poly(3-octylthiophene) [30]. Therefore, in these films electronic excitation is mainly lost nonradiatively: only a very weak emission comes from traps corresponding to the inter-chain aggregates already observed in DMSO solution.…”

Section: Photoluminescence Measurements On Ptcoohsupporting

confidence: 58%

“…We must therefore conclude that the build-up of solid-state devices containing PTs able to exhibit good fluorescence properties must rely on the use of a polymer with an appropriate chain length and on procedures that minimize inter-chain exciton formation. In this respect, the PTCOOH obtained by hydrolysis is more promising [30], while the observation of some residual emission from un-aggregated polymer in spin-coated films of PTCOOH suggests that faster solvent evaporation and/or lower temperatures may, at least to some extent, help to go to the right direction. Also, alternative methods for preparing solid films of PTs (e.g.…”

Section: Discussionmentioning

confidence: 88%

“…Also, alternative methods for preparing solid films of PTs (e.g. alternate self-assembly or spin-coating of a sample diluted in a polymer matrix [30]) may prove more efficient to the purpose. A more complete study, also including time-resolved measurements, of the fluorescence properties of this and related polymers in solution and in variously prepared solid films will be given elsewhere.…”

Section: Discussionmentioning

confidence: 99%

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A poly(alkylsulfany)thiophene functionalized with carboxylic groups

Cagnoli¹,

Mucci²,

Parenti³

et al. 2006

Polymer

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Section: Photoluminescence Measurements On Ptcoohsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A poly(alkylsulfany)thiophene functionalized with carboxylic groups

Cagnoli¹,

Mucci²,

Parenti³

et al. 2006

Polymer

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“…[11][12][13][14][15][16][17] In these studies transparent polymers were preferred as the solid matrix. However, it should be noted that polymer blends can easily result in phase separation due to low mixing entropy and hence careful judgment is required to ensure a homogenous polymer blend.…”

Section: Introductionmentioning

confidence: 99%

Intrachain photoluminescence properties of conjugated polymers as revealed by long oligothiophenes and polythiophenes diluted in an inactive solid matrix

et al. 2006

Self Cite

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The intrinsic intrachain photoluminescence ͑PL͒ dynamics of conjugated polymers in the solid state is investigated. We focus on the PL properties of long ␤-substituted oligothiophenes ͑8-mer, 12-mer, and 16-mer͒ and regio-regular ͑RR͒ and regio-random poly͑3-octylthiophenes͒ ͑P3OTs͒ diluted in the inactive solid matrix polypropylene ͑PP͒. The oligothiophenes have well-resolved 0-0 PL and absorption peaks at 4 K and show a good linear relationship with the reciprocal of the ring number. Franck-Condon analyses on the PL spectra reveal that the strength of the electron-phonon coupling represented by the Huang-Rhys factor becomes weak with increasing chain length in the oligomers. In contrast, the presence of stronger electron-phonon coupling is confirmed in RR P3OT despite it being of a much longer chain length than oligomers. This is probably due to its stereoregular chain conformation. The materials used in this work diluted in PP exhibit single-exponential PL decays with lifetimes that decrease with increases in the chain length. The presence of intrachain exciton migration is shown by the time-resolved PL measurements, except for the case of RR P3OT. The energy shifts attributed to intrachain migration are much smaller than those ascribed to interchain migration. We conclude that a change in the torsion angle around the thiophene ring bonds occurs within 50 ps following the absorption transition in thiophene derivatives and that the torsional change gives rise to a constant Stokes shift ͑60-70 meV͒, regardless of the chain length. We propose that the Stokes shift can be utilized for estimating the magnitude of exciton migration in thiophene derivatives, even in the case of undiluted films.

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“…Solid-state 13 C CP/MAS NMR experiments were performed for neat P3OT on a Bruker AVANCE-400 spectrometer, equipped with a Bruker double-tuned 7 mm probe, with resonance frequencies of 100.6 MHz for 13 C nuclei. The assignments of the characteristic 13 C CP/MAS NMR spectrum of neat P3OT are listed in Table I.…”

Section: Ccp/mas Nmrmentioning

confidence: 99%

Effect of nonconjugated polymers on the conjugation length and structure of poly(3‐octylthiophene) in ternary polymer blend

Huang

Hsieh

Wang

et al. 2007

J of Applied Polymer Sci

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The shifting of l max (p-p* transition) of P3OT (poly(3-n-octylthiophene)) was used to monitor the degree of miscibility between P3OT and the matrix polymers. In the ternary blend system, 1% of P3OT is soluble in a uniform PMMA/EVA20 mixed matrix and does not interfere with the miscibility between PMMA and EVA20 (ethylene-vinyl acetate copolymer with 20% of vinyl acetate). But 5% of P3OT can attract EVA20 out of the matrix and induce the separation from 95% of PMMA/EVA20 matrix and cause the doublet peak of l max . Likewise, the DSC thermograms do not demonstrate the melting-point depression of EVA20 in a 5% P3OT ternary system. However, the melting-point depression did occur only for 1% of P3OT. IR-spectra demonstrate that the methylene groups affinity contributed to the misciblity either in 1% P3OT/PMMA or in P3OT (1 and 5%)/EVA20. The solubility difference of P3OT in PMMA (poor) and EVA20 (better) creates a continuous morphology for obtaining a highly conjugated path in a nonconjugated matrix.

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Concentration-dependence of photoluminescence properties in polythiophene diluted in an inactive polymer matrix

Cited by 18 publications

References 12 publications

A poly(alkylsulfany)thiophene functionalized with carboxylic groups

A poly(alkylsulfany)thiophene functionalized with carboxylic groups

Intrachain photoluminescence properties of conjugated polymers as revealed by long oligothiophenes and polythiophenes diluted in an inactive solid matrix

Effect of nonconjugated polymers on the conjugation length and structure of poly(3‐octylthiophene) in ternary polymer blend

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