Optics and Spectroscopy
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- 2022
Features of photoluminescence of oxygen-saturated films of methoxypolyphenylene vinylene (MEH-PPV)
Kucherenko M.G.
1, Penkov S. A.
1
1Orenburg State University, Orenburg, Russia
Email: clibph@yandex.ru, ingineer-rf2013@yandex.ru
The effects of the influence of the magnetic field on the luminescence intensity of methoxypolyphenylene vinylene (MEH-PPV) films at various air pressures above the samples are investigated. An inversion of the sign of the magnetic field effect was detected with a smooth change in the oxygen concentration in the system. Based on the balance equations, a theoretical model of processes is proposed that takes into account the formation of populations of triplet (T) excitons of MEH-PPV and singlet oxygen during the reactions of triplet-triplet annihilation, T-3Sigmag(O2)-quenching and T-1Deltag(O2)-cross-annihilation of electronic excitations. According to the proposed theoretical model, the magnetic field effects of delayed fluorescence at different concentrations of O2 molecules in MEH-PPV films are calculated, consistent with the experimental results. Keywords: triplet excitons, π-conjugated polymers, magnetically dependent fluorescence, singlet oxygen.
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