Synthesis and characterization of semiconductor polymers having different phenylene–vinylene conjugation lengths
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We have synthesized phenylene–vinylene (PV) polymers containing segments with different conjugation lengths interspaced by random distributed aliphatic segments. Infrared (IR) and ultraviolet–visible (UV–vis) spectroscopies, hydrogen nuclear magnetic resonance (1H NMR) spectrometry and differential scanning calorimetry (DSC) were used to characterize the prepared copolymers’ structures. Polymers molecular weights were determined by gel permeation chromatography (GPC). The effect of polymer structure and composition on emission properties was studied by fluorescence (PL) spectroscopy under different irradiation wavelength. The emission energy shift due to segments with longer conjugation lengths was minor owed to the low polymerization degree achieved.
KeywordsConjugation Length Exciton Singlet Prepared Copolymer Hydrogen Nuclear Magnetic Resonance Conjugation Degree
The authors thank CNPq and FAPESP for financial support.
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