Stable and color tunable MEH-PPV/PMMA polymer blends for light-emitting applications

Kumar, Sangeetha Ashok; Gouthaman, Siddan; Shankar, J.; Periyasamy, Bhuvana K.; Nayak, Sanjay K.

doi:10.1016/j.cplett.2021.138462

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…However, in the high‐temperature region, the MEH‐PPV/SBS composite films exhibited a lower T g compared to the neat SBS film, which did not vary with ε . Moreover, no MEH‐PPV glass transition (61–69°C) 17,23 was observed, possibly due to the low content of MEH‐PPV. Thus, the MEH‐PPV molecules were selectively positioned within the PS domain of the SBS matrix in the MEH‐PPV/SBS composite films, causing a shift in the T g of the PS domain compared to that of the neat SBS film.…”

Section: Resultsmentioning

confidence: 96%

“…Macrophase separation, originating from the immiscibility of LEPs and inert polymers, has been utilized to construct stretchable micro‐/nano‐LEDs. However, some LEPs are miscible in specific types of inert polymers 14–20 . The addition of a small amount of miscible MEH‐PPV to a PMMA 14–17 or PS 18,19 matrix shifts the fluorescent wavelength of neat MEH‐PPV to the blue region.…”

Section: Introductionmentioning

confidence: 99%

“…However, some LEPs are miscible in specific types of inert polymers. [14][15][16][17][18][19][20] The addition of a small amount of miscible MEH-PPV to a PMMA [14][15][16][17] or PS 18,19 matrix shifts the fluorescent wavelength of neat MEH-PPV to the blue region. Under these conditions, interchain aggregation is suppressed by the inert polymer matrix; this isolates each MEH-PPV molecule from other similar molecules (the dilution effect), facilitating intense emission without aggregation quenching (which is observed in solutions).…”

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confidence: 99%

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MEH‐PPV/SBS composite films: Localization and luminescence properties of conductive polymers with microphase separation

Yuan,

Yamamoto,

Kanehashi

et al. 2023

Polymers for Advanced Techs

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This study reports the synthesis of a flexible light‐emitting polymer film by casting the solution formed by blending poly[2‐methoxy‐5‐((2‐ethylhexyl)oxy)‐1,4‐phenylenevinylene] (MEH‐PPV) with poly(styrene‐co‐butadiene‐co‐styrene) (SBS). Scanning force microscopy (SFM) and differential scanning calorimetry (DSC) confirm that MEH‐PPV molecules are selectively positioned in the polystyrene (PS) domain of the fabricated film. As MEH‐PPV molecules are dissolved in the PS phase without aggregation, the photoluminescence (PL) spectrum of the MEH‐PPV/SBS film exhibits a nanometer‐scale bicontinuous luminescent domain with low aggregation quenching. Furthermore, the MEH‐PPV/SBS film exhibits typical elastomeric characteristics (with linear elasticity, a plateau, and densification regions in its stress–strain curves), and its tensile properties are comparable to those of neat SBS films. As MEH‐PPV molecules are almost absent in the polybutadiene (PB) phase (which influences the bulk‐film elastic properties), the concentration of MEH‐PPV shows very little effect on the elastic properties of the composite film.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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MEH‐PPV/SBS composite films: Localization and luminescence properties of conductive polymers with microphase separation

Yuan,

Yamamoto,

Kanehashi

et al. 2023

Polymers for Advanced Techs

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“…The emission kinetics of pristine MEH‐PPV, Zn PPV and 5 % Zr PPV were estimated from time‐resolved PL (TRPL) spectra (Figure 8). The luminescent decay times were estimated by fitting the decay curves through second‐order exponential decay curve using the biexponential equation 3, [35]

true I = A_{1} \exp (() - \frac{t}{τ_{1}}) + A_{2} \exp (() - \frac{t}{τ_{2}})

…”

Section: Resultsmentioning

confidence: 99%

Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

Kumar

Periyasamy

2022

ChemistrySelect

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Exploring and investigating the strategies to improve quantum efficiency and photostability of light‐emitting polymers in polymer light‐emitting diodes is significantly an important topic of research. Thus this study endeavours towards the determination of the role of molecular orbital energy levels of metal oxide nanoparticles on the performance characteristics of hybrid nanocomposites. This work attempts to vary the proportions of zirconium dioxide (ZrO2) nanoparticles in nanocomposites of poly[2‐methoxy‐5‐(2’‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV), which leads to a six‐fold enhancement of luminescence quantum efficiency and increased radiative recombination rate due to an appropriate energy level alignment. An improvement in photostability was also reported due to a reduction in polymer chain defects, inhibition of moisture intervention and most importantly, impediment of the photo‐oxidation by controlling the triplet exciton dynamics. Thus, efforts are made to validate the role of energy levels of ZrO2 nanoparticles in improving the luminescence quantum efficiency and photostability of MEH‐PPV compared to ZnO incorporated MEH‐PPV.

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ZnO energy transfer and enhanced photoluminescence in MEH-PPV/ZnO hybrid nanocomposite

2022

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Stable and color tunable MEH-PPV/PMMA polymer blends for light-emitting applications

Cited by 6 publications

References 27 publications

MEH‐PPV/SBS composite films: Localization and luminescence properties of conductive polymers with microphase separation

MEH‐PPV/SBS composite films: Localization and luminescence properties of conductive polymers with microphase separation

Exciton Dynamics of MEH‐PPV polymer based Nanocomposites: Effect of Molecular Orbital Energy Levels of Nanoparticles**

ZnO energy transfer and enhanced photoluminescence in MEH-PPV/ZnO hybrid nanocomposite

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