Photoluminescence of solvent-selected fluorescent moieties in MEH-PPV solutions and films
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Data
2018
Autores
Ribeiro, Antonio Carlos Chaves
Camargo, Henrique Santiago de
Pereira, Douglas Henrique
Custodio, Rogério
Almeida, Tatiana Duque Martins Ertner de
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Resumo
In this work, we examined how photoluminescence in poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is affected by morphology, dictated by the mode of preparation. For that, MEH-PPV dilute solutions in good and non-solvents, thick cast films with poly[methylmethacrylate] (PMMA) as inert matrix and spin-coated thin films were prepared. These systems were studied by steady-state and time-dependent fluorescence spectroscopy and electronic microscopy. Unexpected photoluminescent behavior was detected in solutions and films and it was related to different excitons modulated by MEH-PPV conformation. By semi empirical calculations we obtained the singlet and triplet state energies of an MEH-PPV model system and, from time-resolved fluorescence spectroscopy, the existence of short-lived excited states was revealed, enabling us to infer on possible singlet fission in MEH-PPV-based systems.
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Photoluminescence, Morphology, Thin films, Time-resolved fluorescence, Computational calculations
Citação
RIBEIRO, Antonio C. C. et al. Photoluminescence of solvent-selected fluorescent moieties in MEH-PPV solutions and films. Journal of the Brazilian Chemical Society, Campinas, v. 29, n. 3, p. 543-559, 2017. DOI: 10.21577/0103-5053.20170167. Disponível em: https://www.scielo.br/j/jbchs/a/rNksDJ8dkfRHwR79Lcwt4Nt/abstract/?lang=en. Acesso em: 14 ago. 2024.