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Title: Tetra-alkoxy substituted PPV derivatives: a new class of highly soluble liquid crystalline conjugated polymers
Authors: VANDENBERGH, Joke 
LUTSEN, Laurence 
Bolink, Henk J.
CLEIJ, Thomas 
Issue Date: 2011
Source: POLYMER CHEMISTRY, 2(6). p. 1279-1286
Abstract: Two first examples of highly soluble tetra-alkoxy substituted PPV derivatives, poly(2,3,5,6-tetrahexyloxy-1,4-phenylene vinylene) (TH-PPV) and poly[2,3,5,6-tetra(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] TEH-PPV, are presented. Both polymers have been fully characterized and the solubility and UV-Vis absorption characteristics have been studied in various organic solvents. Due to the symmetric nature of the repeating unit, TH-PPV and TEH-PPV have an inherently regioregular nature, which is unusual for PPV-type polymers. Observations from polarized light microscopy and differential scanning calorimetry indicate that TH-PPV exhibits thermally induced order resulting in a liquid crystalline mesophase. In contrast, due to steric hindrance of the branched alkyl side chains, TEH-PPV is rather disordered. As a first demonstration of the charge transporting properties of TH-PPV, a simple solution processed electroluminescent device has been prepared. The electroluminescence spectrum shows a detailed structure similar to that observed from the solid-state photoluminescence spectrum and shows one of the highest energy emissions observed for PPVs. It is speculated that the enhanced order in TH-PPV will benefit the usage of this new class of polymers in optoelectronic applications, in which the improved charge carrier mobility is desirable.
Notes: [Vandenbergh, Joke; Van Severen, Ineke; Adriaensens, Peter; Cleij, Thomas J.; Vanderzande, Dirk] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Lutsen, Laurence; Vanderzande, Dirk] IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium. [Bolink, Henk J.] Univ Valencia, Inst Ciencia Mol ICMol, Valencia 46071, Spain.
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ISSN: 1759-9954
e-ISSN: 1759-9962
DOI: 10.1039/c1py00027f
ISI #: 000290682200010
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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