Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH-PPV and Poly(9,9'-dioctylfluorene-2,7-diyl)

COSIELLO, R. F.; SUSMAN, M. D.; P. F. ARAMENDIA; T. D. Z. ATVARS

JOURNAL OF LUMINESCENCE

Elsevier

Lugar: Amsterdam; Año: 2010 vol. 130 p. 415 - 423

0022-2313

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 goodcorrelation of MEH-PPV absorption and emission energy with Hildebrandt's dispersiveparameter indicate that dispersive forces regulate the effective extent of the luminophore. Theexcitation and emission spectra of the α and β chains can be distinguished in PF solutionsusing 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 solutionsand in films reflecting efficient energy migration. Anisotropy of PF in solutions and films demonstrates great differences in energy transfer efficiency within the α- and β- phases, whilethere is no energy transfer between these chain conformations