Novel Non-Conjugated Main-Chain Hole-Transporting Polymers for Organic Electronics Application

• Published in: Macromolecular rapid communications 2010-09, Vol.31 (17), p.1560-1567
• Main Authors: Schelter, Jürgen, Mielke, Georg Felix, Köhnen, Anne, Wies, Jenna, Köber, Sebastian, Nuyken, Oskar, Meerholz, Klaus
• Format: Article
• Language: English
• Subjects: Applied sciences; Cationic; crosslinking; Deposition; Devices; Electronics; Exact sciences and technology; hole conductivity; Light-emitting diodes; Multilayers; Networks; Optoelectronic devices; organic light-emitting diode; Organic polymers; Physicochemistry of polymers; Polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; spin coating; triarylamines
• ISSN: 1022-1336; 1521-3927; 1521-3927
• DOI: 10.1002/marc.201000125

A new class of hole‐transporting polymers for use in organic electronic devices such as organic light‐emitting diodes (OLEDs) or photorefractive holographic storage devices has been synthesized. The polymers contain tetraarylbenzidines or tetraarylphenylenediamines as charge‐transporting units in the polymer backbone and are connected by non‐conjugating fluorene bridges. For use in OLEDs the novel polymers were functionalized with oxetane groups that can be cross‐linked via a cationic ring opening polymerization to yield insoluble networks. Such insoluble films are necessary for the fabrication of multilayer devices by wet deposition techniques. The novel materials feature improved film‐formation properties as demonstrated in green‐emitting double‐layer OLEDs. The synthesis of novel hole‐transporting polymers with tetraarylbenzidines or tetraarylphenylenediamines as charge‐transporting units with a non‐conjugating fluorene bridge is shown. The cross‐linkable derivatives are promising candidates for solution‐processed multilayer OLEDs and will be incorporated into highly‐efficient green‐emitting phosphorescent OLEDs for improved charge injection.