Impact of fluorinated vinylene units on supramolecular organization and optical properties of poly(p-phenylenedifluorovinylene) thin films as a class of blue band gap conjugated polymers

This study is an investigation on the interplay between supramolecular organization and optical properties of thin films of conjugated polymers with fluorinated vinylene units such as poly[2-(2-ethylhexyloxy)-5-methoxy]-1,4-phenylenedifluorovinylene (MEH-PPDFV) and poly(2-methoxy-5-propyloxysulfonat...

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Bibliographic Details
Published in:Polymer (Guilford) 2008-09, Vol.49 (19), p.4133-4140
Main Authors: Losurdo, Maria, Giangregorio, Maria M., Capezzuto, Pio, Bruno, Giovanni, Babudri, Francesco, Cardone, Antonio, Martinelli, Carmela, Farinola, Gianluca M., Naso, Francesco, Büchel, Michael
Format: Article
Language:English
Subjects:
Applied sciences
Conjugated polymer thin films
Electrical, magnetic and optical properties
Exact sciences and technology
MEH-PPDFV
Optical properties
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:This study is an investigation on the interplay between supramolecular organization and optical properties of thin films of conjugated polymers with fluorinated vinylene units such as poly[2-(2-ethylhexyloxy)-5-methoxy]-1,4-phenylenedifluorovinylene (MEH-PPDFV) and poly(2-methoxy-5-propyloxysulfonatephenylenedifluorovinylene) (MPS-PPDFV), which are both PPV polymers with fluorinated double bonds with alkoxy chains in the 2 and 5 positions. MEH-PPDFV is the fluorinated version of the widely investigated MEH-PPV, and MPS-PPDFV is characterized by the presence of ionic alkoxy side chains. This interplay is elucidated exploiting atomic force microscopy, spectroscopic ellipsometry and photoluminescence to obtain complementary information. It is demonstrated that the presence of F-atoms in the vinylene units of the MEH-PPDFV yields a blue optical band gap with the maximum of the fundamental HOMO–LUMO transition and of the room temperature photoluminescence at 3.74eV (331nm) and at 2.71eV (458nm), respectively. The blue-absorption and emission in the thin films are ascribed to the fact that fluorine atoms on the vinylene units prevent π-stacking of polymeric chains. Furthermore, the dependence of morphology, anisotropy in optical properties and photoluminescence properties of films on deposition methodology is also discussed. MEH-PPDFV also emits homogeneous blue-greenish electroluminescence at 2.46eV (504nm). [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2008.07.024