Long-Range Energy Migration in Photoexcited Polymers

Yu, Junsheng; Kim, J. K.; Cho, H. N.; Kim, D. Y.; Kim, C. Y.; Song, Nam Woong; Kim, D.

doi:10.1021/ma0001483

Cited by 15 publications

(14 citation statements)

References 21 publications

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“…Synthesis of well‐defined polymers containing precisely placed aromatic chromophores is currently of interest in applications such as energy transfer studies, fluorescent labeling, and light emitting diodes 1–15. For example, there are several reports of fluorene‐containing polymers, such as polyfluorenes2, 7, 8, 11 and poly(vinylfluorenes),17, 18 which have been reported to possess interesting luminescent properties in addition to desirable chemical and thermal properties 7, 8, 11…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the placement of a single chromophore label, either at the chain end or embedded in the polymer backbone, has found use in energy transfer systems containing donor‐acceptor groups 5. For instance, the synthesis of polymers and dendrimers labeled with anthracene,17, 22, 23 pyrene,12–14, 24–28 perylene,29, 30 and coumarin31, 32 have received considerable interest recently.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of fluorene end‐labeled polystyrene with atom transfer radical polymerization

Goodman

Roof

Tillman

et al. 2005

J. Polym. Sci. A Polym. Chem.

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Fluorene end-labeled polystyrene was prepared by atom transfer radical polymerization with 9-bromofluorene as the initiator. Reactions were carried out in bulk or tetrahydrofuran solutions at temperatures of 80 8C or above. Analysis by gel permeation chromatography indicated that the polymers formed had low polydispersities with molecular weights consistently 2-5 times higher than calculated based on monomer-to-initiator ratios. Coupling of two fluorenyl radicals, formed by activation of the 9-bromofluorene, was found to compete with initiation, leading to the higherthan-expected molecular weight values while giving rise to a fluorene dimer. UV-vis spectrometry indicated near-quantitative fluorene labeling of the polystyrene. V V C 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 2657-2665, 2005

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of fluorene end‐labeled polystyrene with atom transfer radical polymerization

Goodman

Roof

Tillman

et al. 2005

J. Polym. Sci. A Polym. Chem.

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“…In the recent past, a long range interaction has been described in poly(N-vinylcarbazole) and poly(9,9'-din-hexyl-2,7-fluorenylvinylene) bilayer systems due to energy migration. 22 In our case the energy transfer in the bilayers is qualitatively explained, as described bellow, considering a long range interaction based on a surface-surface geometry. This means that PFO↔MEH PPV energy transfer in the bilayers can occur at larger distances compared to the Förster radius 23 or to the exciton dissociation length.…”

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confidence: 99%

Long range energy transfer in conjugated polymer sequential bilayers

Cury

Bourdakos

Dai

et al. 2011

The Journal of Chemical Physics

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Steady-state and time-resolved photoluminescence have been used to investigate the optical properties of bilayer and blend films made from poly(9,9-dioctyl-fluorene-2,7-diyl) (PFO) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH PPV). Energy transfer has been observed in both systems. From steady-state photoluminescence measurements, the energy transfer was characterized by the effective enhancement of the MEH PPV emission intensity after exciting the donor states. Relatively faster decays for the PFO donor emission have been observed in the blends as well as in the bilayer structures, confirming effective energy transfer in both structures. In contrast to the bilayers, the time decay of the acceptor emission in the blends presents a long decay component, which was assigned to the exciplex formation in these samples. For the blends the acceptor emission is in fact a composition of exciplex and MEH PPV emissions, the later being due to Förster energy transfer from PFO. In the bilayers, the exciplex is not observed and temperature dependence photoluminescence measurements show that exciton migration has no significant contribution to the energy transfer. The efficiency and very long range of the energy transfer in the bilayers is explained assuming a surface-surface interaction geometry where the donor/acceptor distances involved are much longer than the common Förster radius.

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“…Non-radiative energy transfer of electronic excitation (NRET) is one of the techniques that satisfies this condition and can be employed in studies of the miscibility of polymer blends including those prepared with conjugated polymers. 19,26,[42][43][44][45] Because the rate of the NRET process is a function of the distance between the donor (in the electronic excited state) and acceptor (in the electronic ground state) chromophores, which is known as the Förster radius, this method provides a direct measurement of phase interpenetration. 46,48 Here we show morphology and miscibility studies of MEH-PPV blends with some optically inert polymers (host polymers): poly(styrene-co-2-ethylhexyl acrylate) (SEHAMA) with three different contents of 2-ethylhexyl acrylate units (0, 9 and 19 mol%) ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Probing interchain interactions in emissive blends of poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] with polystyrene and poly(styrene-co-2-ethylhexyl acrylate) by fluorescence spectroscopy

Andrade¹,

Atvars²

2006

J. Braz. Chem. Soc.

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Nesse trabalho foram realizados estudos dinâmicos e estáticos de fotoluminescência de blendas poliméricas do poli[2-metóxi-5-(2'-etilexiloxi)-p-fenileno vinileno] (MEH-PPV) com poliestireno-co-2-co-metacrilato de metila1-1-pirenila e seu copolímero poli(estireno-co-acrilato de 2-etilexila-co-1-metacrilato de metila1-1-pirenila) (com 9 mol% e 19 mol% de unidades acrilato de 2-etilexila unidades e 0,06 mol% de 1-pirenila). O poliestireno marcado com pirenilo e alguns de seus copolímeros foram sintetizados por polimerização em emulsão e caracterizados por 13 C e 1 H NMR, FTIR, GPC, DSC e UV-Vis. Os filmes foram preparados por deposição centrífuga a partir de soluções em clorofórmio, sendo a composição das blendas de 0,1, 0,5, 1,0, e 5,0 m/m% de MEH-PPV. A miscibilidade desses sistemas foi estudada através dos processos de transferência não-radiativa de energia entre o grupo 1-pirenila (doadores de energia) e o MEH-PPV (receptor de energia). A intensidade relativa de emissão e os tempos de decaimento de fluorescência do doador mostraram que a miscibilidade do MEH-PPV e dos copolímeros e maior do que entre o MEH-PPV e o poliestireno o que foi confirmado por microscopia óptica de epifluorescência e por microscopia eletrônica de varredura.We present dynamic and static photoluminescence studies on polymer blends of conjugated poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) with polystyrene-co-1-pyrenyl methyl methacrylate and its copolymer poly(styrene-co-2-ethylhexyl acrylate-co-1-pyrenylmethyl methacrylate) (with 9 mol% and 19 mol% of 2-ethylhexyl acrylate units and 0.06 mol% of 1-pyrenyl). Pyrenyl-labeled polystyrene and its copolymers were synthesized by emulsion polymerization and characterized by 13 C and 1 H-NMR, FTIR, GPC, DSC, and UVVis. Spin-coating films of the blends were prepared from chloroform solutions with 0.1, 0.5, 1.0, and 5.0 wt% of MEH-PPV. The miscibility of these systems was studied by non-radiative energy transfer processes between the 1-pyrenyl moieties (the energy donor) and MEH-PPV (the energy acceptor). The relative emission intensities and the fluorescence lifetimes of the donor showed that the miscibility of MEH-PPV and the copolymers is greater than that of MEH-PPV and polystyrene and this was confirmed by epifluorescence optical microscopy and scanning electron microscopy.Keywords: poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV), blends, miscibility, copolymer poly(styrene-co-2-ethylhexyl acrylate-co-1-pyrenylmethyl methacrylate), fluorescence, energy transfer IntroductionConjugated polymers are the subject of considerable scientific attention because they constitute attractive components for application as emissive materials in electroluminescent devices and, in particular, as organic light-emitting diodes (OLED).1 Such interest is attributed to their superior processability and flexibility relative to inorganic compounds, greater possibility of preparation of materials with distinct emission colors, electroluminescence emission with low turn-on volt...

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Long-Range Energy Migration in Photoexcited Polymers

Cited by 15 publications

References 21 publications

Synthesis and characterization of fluorene end‐labeled polystyrene with atom transfer radical polymerization

Synthesis and characterization of fluorene end‐labeled polystyrene with atom transfer radical polymerization

Long range energy transfer in conjugated polymer sequential bilayers

Probing interchain interactions in emissive blends of poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] with polystyrene and poly(styrene-co-2-ethylhexyl acrylate) by fluorescence spectroscopy

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