Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/75306
Type: Artigo de periódico
Title: Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH-PPV and Poly(9,9 '-dioctylfluorene-2,7-diyl)
Author: Cossiello, RF
Susman, MD
Aramendia, PF
Atvars, TDZ
Abstract: Absorption, emission, and anisotropy measurements were performed on poly-[2-methoxy-5(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and poly-(9,9'-dioctylfluorene-2,7-diyl) (PF) solutions of various solvents, and in thin films deposited from them. The good correlation of MEH-PPV absorption and emission energy with Hildebrandt's dispersive parameter indicate that dispersive forces regulate the effective extent of the luminophore. The excitation and the emission spectra of alpha and beta chains can be distinguished in PF solutions using the steady-state anisotropy. PF films show greater memory effect from the solutions from which they were Spun than MEH-PPV. Anisotropy of MEH-PPV is very low, both in solutions and in films reflecting efficient energy migration. Anisotropy of PF in solutions and films demonstrates great differences in energy transfer efficiency within the alpha and beta phases, while there is no energy transfer between these chain conformations. (C) 2009 Published by Elsevier B.V.
Subject: Fluorescence anisotropy
Solvent effects
Solutions and films
Conjugated polymers
Polyfluorene
MEH-PPV
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jlumin.2009.10.006
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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