Photoluminescence of Solvent-Selected Fluorescent Moieties in MEH-PPV Solutions and Films

Author(s)

Ribeiro, Antonio C. C. ^{[1, 2]} ; Camargo, Henrique S. ^[1] ; Pereira, Douglas H. ^{[3, 4]} ; Custodio, Rogerio ^[3] ; Martins, Tatiana D. ^[1]

Affiliation

^[1] Univ Fed Goias, Inst Quim, Campus 2 Samambaia, POB 24242, BR-74690970 Goiania, Go - Brazil

^[2] Inst Fed Educ Ciencia & Tecnol, Campus Morrinhos, POB 92, BR-75650000 Morrinhos, Go - Brazil

^[3] Univ Estadual Campinas, Inst Quim, POB 6154, BR-13083970 Campinas, SP - Brazil

^[4] Univ Fed Tocantins, Campus Gurupi, POB 66, BR-77410530 Gurupi, To - Brazil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 29, n. 3, p. 543-559, MAR 2018.
• Web of Science Citations: 0

Abstract

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. (AU)

• FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
• Grantee: Munir Salomao Skaf
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC