Effect of temperature on emission of MEH–PPV/PS solid-state solution

Marletta, Alexandre; Gonçalves, Vagner; Balogh, Débora Terezia

doi:10.1016/j.jlumin.2005.03.005

Cited by 26 publications

(22 citation statements)

References 19 publications

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“…3(b). The blue shift of emission spectra upon dilution of MEH-PPV in PMMA has been observed by the previous works, 5,25,26 which can be explained by the cutting-off of the energy transfer to low energy traps and suppressing of generation of interchain excitons, and conformational changes of the polymer backbones. 27 Assuming that only intrachain excitons are responsible for the PL, the blue shift can be attributed to the thermally induced torsional motions shortening the conjugation lengths and differences in the HuangRhys coupling factors (S) for chains with distinct conjugation lengths, leading to differences in the relative intensities of the zero-and higher-order phonons, producing changes in the spectral profile.…”

supporting

confidence: 57%

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Yang

Lin

et al. 2015

Applied Physics Letters

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We investigated the transitions of conformations and their effects on emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) single molecules in PMMA matrix during thermal annealing process. Total internal reflection fluorescence microscopy measurements reveal the transformation from collapsed conformations to extended, highly ordered rod-like structures of MEH-PPV single molecules during thermal annealing. The blue shifts in the ensemble single molecule PL spectra support our hypnosis. The transition occurs as the annealing temperature exceeds 100 °C, implying that an annealing temperature near the glass transition temperature Tg of matrix is ideal for the control and optimization of blend polymer films.

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supporting

confidence: 57%

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Yang

Lin

et al. 2015

Applied Physics Letters

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“…Almost similar shapes in absorption spectra reveal that light doping does not make any significant influence in disordering of polymer chain. Similar result has been observed by introducing polystyrene in MEH-PPV [9]. It is known that MEH-PPV exhibits a strong emission band in the red portion of the visible spectrum.…”

Section: Resultssupporting

confidence: 86%

“…1). Electron transitions between non-localized bands (π→π*) are responsible for this unique absorption band [8,9]. The onset of absorption mimics that band gap of MEH-PPV is 2.2 eV.…”

Section: Resultsmentioning

confidence: 93%

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Optical properties of Poly-[2-methoxy-5-(2-ethyl-hexyloxy)-phenylene vinylene and its application in photovoltaic cells

Sirimanne

Premalal

2007

Sri Lankan J Phys

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“…with similar interchain interactions. [10]. That is to say, the molecular packing appears not to be influenced by the polymer solution concentration.…”

Section: Resultsmentioning

confidence: 91%

Surface morphology and optical characterization of OC1 OC6-PPV films

et al. 2006

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We report optical and morphological properties of poly(2-methoxy-5-hexyloxy-p-phenylenevinylene) (OC 1 OC 6 -PPV) films processed by casting, spin-coating (SC) and Langmuir-Blodgett (LB) techniques. The absorption spectra are practically the same, with an absorption maximum at approximately at 500 nm. For the photoluminescence (PL) spectra at low temperature (T=10K), a small but significant difference was noted in the cast film, in comparison with the LB and SC films. The zero-phonon transition shifted from 609 nm for the LB film to 615 and 621 nm for the SC and cast films, respectively. At room temperature, the PL spectra are similar for all films, and blue shifted by ca. 25 nm in comparison with the spectra at low temperature due to thermal disorder. Using atomic force microscopy (AFM) we inferred that the distinctive behavior of the cast film, probably associated with structural defects, is related to the large thickness of this film. The surface roughness, which was surprisingly higher for the LB film, apparently played no role in the emission properties of OC 1 OC 6 -PPV films.

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Effect of temperature on emission of MEH–PPV/PS solid-state solution

Cited by 26 publications

References 19 publications

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Optical properties of Poly-[2-methoxy-5-(2-ethyl-hexyloxy)-phenylene vinylene and its application in photovoltaic cells

Surface morphology and optical characterization of OC1 OC6-PPV films

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