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Title: | Copolymers of 3,4-ethylenedioxythiophene and of pyridine alternated with fluorene or phenylene units: Synthesis, optical properties, and devices | Authors: | AUBERT, Pierre-Henri KNIPPER, Martin Groenendaal, L LUTSEN, Laurence MANCA, Jean VANDERZANDE, Dirk |
Issue Date: | 2004 | Publisher: | AMER CHEMICAL SOC | Source: | MACROMOLECULES, 37(11). p. 4087-4098 | Abstract: | We report the synthesis of four conjugated copolymers based on alkylated fluorene or phenylene units which band gap is tuned by the regular insertion of an electron-donating or electron-withdrawing unit, (3,4-ethylenedioxy)thiophene and pyridine, respectively. The (AB)(n) regular sequence is achieved by Suzuki polycondensation reactions. The characterization of the copolymers by size exclusion chromatography reveals chains lengths of about 20-30 repeat units (40-60 rings), leading to a good processability for potential optical applications. The 1:1 ratio between the two units improves the solubility of the material in common organic solvents, allowing for physicochemical characterizations. Raman and FT-IR experiments indicate that the electronic structure of the backbone is rather benzenic in the neutral (undoped) state, as opposed to a quinoic oxidized structure. All copolymers exhibit interesting electro-chromic properties as attested by cyclic voltammetry and UV-vis experiments. They reversibly switch among the entire visible spectra, which is of particular importance for display applications. Moreover, the EDOT-based copolymers strongly absorb in the NIR window (1200 nm up to 3000 nm) with some potential electrochromic applications related to this spectral window. Light-emitting diodes were fabricated using these copolymers as active layer. To improve hole and electron injection, the active layer was sandwiched between a ITO/PEDOT:PSSA/copolymer/Ba/Al. The emitting properties were studied on the base of photoluminescence (PL) and electroluminescence (EL) experiments. The spectral emission varies from blue-green to yellow, depending on the composition of the copolymers. | Notes: | IMEC, IMOMEC Div, SBG OS, B-3590 Diepenbeek, Belgium. Limburgs Univ Ctr, Grp Organ & Polymer Chem, SBG, B-3590 Diepenbeek, Belgium. AGFA Gevaert, Dept Chem, RM D, B-2640 Mortsel, Belgium.Vanderzande, D, IMEC, IMOMEC Div, SBG OS, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.dirk.vanderzande@luc.ac.be | Document URI: | http://hdl.handle.net/1942/2430 | ISSN: | 0024-9297 | e-ISSN: | 1520-5835 | DOI: | 10.1021/ma030540r | ISI #: | 000221688600023 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2005 |
Appears in Collections: | Research publications |
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