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Controlling the Photoluminescence from a Laser Dye through the Oxidation Level of Polypyrrole
Author(s) -
Santos Marcos J. L.,
Girotto Emerson M.,
Brolo Alexandre G.
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900489
Subject(s) - polypyrrole , photoluminescence , förster resonance energy transfer , photochemistry , materials science , polymer , acceptor , molecule , dye laser , conductive polymer , laser , chemistry , fluorescence , polymerization , optoelectronics , optics , organic chemistry , physics , composite material , condensed matter physics
In situ spectroelectrochemistry was used to study the emission of the laser dye oxazine 720 (oxa720) embedded into a polypyrrole (ppy) matrix. The photoluminescence (PL) of the dye was found to be controlled by the oxidation level of ppy. It is suggested that a Förster resonance energy transfer (FRET) mechanism is involved in the potential‐controlled PL. FRET calculations were used to determine the dependence of the apparent distance between the dye molecules and the polymer chain with the oxidation level of ppy. In the reduced state, at −0.9 V, an efficient FRET process quenches the PL from the dye due to the short distance between the dye molecules and the polymer chains. In the oxidized state, at +0.9 V, the FRET efficiency is only 24% leading to higher PL intensity, due to the larger distance between the donor (oxa720) and the acceptor (ppy).