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Switching the photo physics of MDMO-PPV under PMMA environment- a boon for organic electronics

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Abstract

The paper presents a fascinating photo physics of the light emitting polymer (LEP), poly2-methoxy-5-(3’,7’-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) when diluted by the solid poly methylmethacrylate (PMMA) environment. The neat MDMO-PPV exhibiting the single peak absorption at 496.6 nm and emission at 589 nm (of 0–0 transition) displays the blue and red shifted bimodal absorption and emissions simultaneously in the presence of inert PMMA matrix. Blue phase peaks are dominant for low dopant concentrations whereas the red phase peaks are dominant at higher concentrations. A switching from blue phase to red phase is due to transition from collapsed chain conformations to coupled or aggregated conformations of conjugated chains of MDMO-PPV. At low doping level, the intra-chain excitonic coupling between the transition dipoles (TDMs) of MDMO-PPV are disrupted by the PMMA matrix, whereas the intra-chain excitonic coupling is pronounced at higher doping levels in accordance with Kasha’s model of aggregation. The emissions around 525 and 530 nm correspond to MDMO-PPV oligomer precursors and that around 580 to 605 nm are due to J aggregated conjugated chains. The activation energy calculations from Broido’s, Horwitz-Metzer and Van –Kravelin methods are in good agreement, elucidating the correctness and consistency of the techniques used. Increase in the thermal stability of the samples with the increased doping level is affirmed by increase in activation energy from about 105 to 155 kJ/ mole. The XRD studies confirm the blue phase induced disorder and supported by the occurrence of the FTIR resonant peaks related to vinyl ring wagging and C = C stretching modes. Enhanced dc and conductivity increase in dielectric constant, the photo physics related parameters like energy gap, Urbach energy and Stokes shifts are reported. Highly correlated wavelength shifts and intensities of emission for both the exciting wavelengths 340 nm and 450 nm along with the unprecedented tuning of emission over wide range of the visible region with the most simple and the economic solution cast method are the novelty of this work. This invention can boost the technological aspects of plastic electronic display devices, like LED, LASER, solar cell and EM shielding.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are thankful to the Microtron Center and PURSE Lab of Mangalore University for providing instrumentation facility to carry out electrical studies, TGA, DSC and FTIR investigations. We are grateful to USIC, Karnataka university and Innovation Center of Manipal Institute of Technology (MIT) regarding UV-Visible, fluorescence and XRD characterizations.

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Authors and Affiliations

  1. Department of Physics, Mangalore University, Konaje, 574199, Karnataka, India

    Ishwar Naik

  2. Department of Physics, GFGC Kumta, Kumta, 581343, Karnataka, India

    Ishwar Naik

  3. Department of Physics, Karnataka University, Dharwad, 580003, Karnataka, India

    R. F. Bhajantri

  4. Department of Physics, Dr. A. V. Baliga College of Arts and Science, Kumta, 581343, Karnataka, India

    Vinayak Bhat

  5. Department of Physics, Government First Grade College, Dharwad, Karnataka, India

    B. S. Patil

  6. Department of Physics, Government First Grade College, Sirsi, 581401, Karnataka, India

    Vasant S. Naik

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Naik, I., Bhajantri, R.F., Bhat, V. et al. Switching the photo physics of MDMO-PPV under PMMA environment- a boon for organic electronics. J Polym Res 30, 133 (2023). https://doi.org/10.1007/s10965-023-03511-1

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