Abstract
Luminescent polypyrrole–polymethylmethacrylate (PPy–PMMA) blends have been obtained by bulk polymerization of MMA in presence of different concentration of PPy nanowires. The PPy nanowires are distributed over the rock-like features of PMMA as observed from SEM images. Raman spectra indicate the formation of blend. PPy–PMMA blends exhibit high photoluminescence emission intensity though PPy is not a fluorescent polymer. All the blends exhibit blue emission as observed in CIE diagram. Enhanced emission from the blend as compared to pristine PPy is obtained due to Forster resonance energy transfer (FRET) between PMMA and PPy. The emission intensity of the blend becomes highest for an optimized amount of both the components, i.e. 0.8 g of PPy to 1 ml of MMA in the blend with energy transfer efficiency of 66% and high colour purity. So, optimization of the amount of PPy and PMMA in the blend is important to get high luminescence from the PPy–PMMA blend. The maximum electroluminescence quantum efficiency of the polymer light-emitting diode (PLED) using optimized PPy–PMMA blend as active layer is found to be 2% at turn on voltage of 3 V for the emission at wavelength of 400 nm, whereas at turn on voltage of 3.5 V, the PLED emits light of wavelength 330 nm.
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Acknowledgements
Authors are grateful to CRF, IIT(ISM) Dhanbad, for providing the facility of FESEM and UV–Vis absorption spectrophotometry. They acknowledge MNIT Jaipur for Raman spectroscopy facility. They are also thankful to DST-FIST facility (Project No. SR/FST/PSI-004/2013) for allowing us to use lifetime spectrometer.
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Dey, S., Kar, A.K. Effect of PPy concentration on the photoluminescence of PPy–PMMA blends: observation of acceptor concentration-dependent FRET. J Mater Sci: Mater Electron 33, 9018–9030 (2022). https://doi.org/10.1007/s10854-021-07092-x
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DOI: https://doi.org/10.1007/s10854-021-07092-x