Abstract

We report on the optical and photo-physical properties of a fluorinated poly(p-phenylenevinylene) derivative,namely poly(2-methoxy-5-[(2-ethylhexyl)oxy]-1,4-phenylenedifluorovinylene) (MEH-PPDFV)and we compare them with those of the well-known non fluorinated reference system, poly(2-methoxy-5-[(2-ethylhexyl)oxy]-1,4-phenylenevinylene) (MEH-PPV) synthesized with the same procedure.Remarkable blue-shifts of absorption and emission spectra of MEH-PPDFV with respect to MEH-PPVare observed, due to the larger distortion from planarity of the fluorinated species. In addition, theblue-shift for optical transitions in absorption spectra is more pronounced than in emission ones, sincethe molecule conformation in the excited states is more planar than in the ground one.Microsecond photo-induced absorption spectra of MEH-PPDFV reveal three bands possessing spectralproperties and/or kinetics different from those observed for MEH-PPV. The assignment of these transitionsis provided in terms of free and trapped polarons as well of triplet excitons. Free-polarons have anintrinsic decay constant of 3 ms, while the trapping dynamics has a longer kinetics of 40 ms. The tripletexciton, instead, shows a monoexponetial decay behavior of constant about 10 ms.

Autore Pugliese

• Cardone Antonio

Tutti gli autori

• Burger M.; Floris F.; Cardone A.; Farinola G.M.; Morandi V.; Marabelli F.; Comoretto D.

Titolo volume/Rivista

Organic electronics

Anno di pubblicazione

2017

ISSN

1566-1199

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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