Open AccessОсобенности фотолюминесценции кислородонасыщенных пленок метокси-полифениленвинилена (MEH-PPV)
Author(s) -
М. Г. Кучеренко,
S. A. Penkov
Publication year - 2022
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2022.05.52422.12-22
Subject(s) - annihilation , quenching (fluorescence) , magnetic field , oxygen , molecule , exciton , luminescence , singlet oxygen , materials science , fluorescence , photochemistry , chemistry , physics , condensed matter physics , nuclear physics , optics , optoelectronics , quantum mechanics
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-{3}^Sigma_g(O_2)-quenching and T-{1}^Delta_g(O_2)-cross-annihilation of electronic excitations. According to the proposed theoretical model, the magnetic field effects of delayed fluorescence at different concentrations of O_2 molecules in MEH-PPV films are calculated, consistent with the experimental results.