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Oxidation-Induced Photoluminescence of Conjugated Polymers

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Oxidation-Induced Photoluminescence of Conjugated Polymers

Auteurs : Ma. Helen M. Cativo [États-Unis] ; Amanda C. Kamps [États-Unis] ; JIAN GAO [États-Unis] ; John K. Grey [États-Unis] ; Geoffrey R. Hutchison [États-Unis] ; So-Jung Park [États-Unis]

Source :

The Journal of physical chemistry. B [ 1520-6106 ] ; 2013.

RBID : Pascal:13-0366862

Descripteurs français

Pascal (Inist)
- Photoluminescence, Oxydation, Transfert électron, Diffusion Raman résonance, Spectre absorption, Conformation, Polymère conjugué.

English descriptors

KwdEn :
- Absorption spectrum, Conformation, Conjugated polymer, Electron transfer, Oxidation, Photoluminescence, Resonance Raman scattering.

Abstract

Here, we report an unusual oxidation-induced photoluminescence (PL) turn-on response of a poly(3-alkoxythiophene), poly(3-{2-[2-(2-ethoxyethoxy)ethoxy]-ethoxy}thiophene) (PEEEET). PEEEET shows a significantly red-shifted absorption spectrum compared to polyalkylthiophenes and is almost nonfluorescent (quantum yield <<<> 1%) in its pristine state. The introduction of sulfonyl defects along the polymer backbone by the oxidation of PEEEET with metachloroperbenzoic acid (m-CPBA) increased the emission quantum yield with the intensity increasing with the degree of oxidation. Molecular modeling data indicated that the oxidation-induced PL increase cannot be explained by the nature of monomer units and radiative rate changes. We attributed the enhanced fluorescence to the reduced nonradiative rate caused by the increased band gap, according to the energy gap law, which is consistent with the observed blue shifts in absorption and PL spectra accompanied by the PL increase.

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption spectrum</term>
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<front><div type="abstract" xml:lang="en">Here, we report an unusual oxidation-induced photoluminescence (PL) turn-on response of a poly(3-alkoxythiophene), poly(3-{2-[2-(2-ethoxyethoxy)ethoxy]-ethoxy}thiophene) (PEEEET). PEEEET shows a significantly red-shifted absorption spectrum compared to polyalkylthiophenes and is almost nonfluorescent (quantum yield <<<> 1%) in its pristine state. The introduction of sulfonyl defects along the polymer backbone by the oxidation of PEEEET with metachloroperbenzoic acid (m-CPBA) increased the emission quantum yield with the intensity increasing with the degree of oxidation. Molecular modeling data indicated that the oxidation-induced PL increase cannot be explained by the nature of monomer units and radiative rate changes. We attributed the enhanced fluorescence to the reduced nonradiative rate caused by the increased band gap, according to the energy gap law, which is consistent with the observed blue shifts in absorption and PL spectra accompanied by the PL increase.</div>
</front>
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Oxidation-Induced Photoluminescence of Conjugated Polymers

Oxidation-Induced Photoluminescence of Conjugated Polymers

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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