Photophysical properties of a fluorene–bipyridine copolymer and its complexes with europium

• Published in: Synthetic metals Vol. 162; no. 1; pp. 35 - 43
• Main Authors: Turchetti, D.A., Rodrigues, P.C., Berlim, L.S., Zanlorenzi, C., Faria, G.C., Atvars, T.D.Z., Schreiner, W.H., Akcelrud, L.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2012; Elsevier
• Subjects: Agglomeration; Applied sciences; Bipyridine copolymers; Charge transport; Copolymers; Electroluminescence; Electronics; Europium; Europium complexes; Exact sciences and technology; Fluorene; Mathematical analysis; Optoelectronic devices; Organic polymers; Photophysical properties; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Spectra; Fluorene; Photophysical properties; Europium complexes; Bipyridine copolymers; Wittig reaction; Solution polycondensation; Rare earth metal complex; Photoluminescence; Pyridine copolymer; Electroluminescence; Experimental study; Lateral group; Geometrical structure; Electronic structure; Conjugated copolymer; Optical properties; Preparation; Organic light emitting diodes; Europium complex; Fluorene derivative copolymer; Optical absorption
• DOI: 10.1016/j.synthmet.2011.11.005
• ISSN: 0379-6779

[Display omitted] ► Europium ions were inserted in 80% of the repeating units of a di-pyridine copolymer. ► The complexation required a twist of 79° (49 kJ) between the pyridine units. ► No electronic coupling occurred between the backbone and the complexation sites. ► Red and blue emission were seen in the spectra of the complexed copolymers. ► The ion had a trapping effect in the charge transport properties. The synthesis and structural characterization of a europium complexed fluorene–bipyridine copolymer are described. A level of ion insertion of 80% in molar basis was achieved, and theoretical calculations showed that it required a twist of 179° (49 kJ) between the pyridine units. Spectroscopy data showed that no electronic coupling between the main backbone and the complexation sites had occurred, but these hindered the interchain aggregation observed in the non complexed polymer. Preliminary electroluminescence studies showed that the EL and PL spectra are consistent, and that the ion had a trapping effect in the charge transport.