A Fully Aryl-Substituted Poly(ladder-type pentaphenylene):  A Remarkably Stable Blue-Light-Emitting Polymer

• Published in: Macromolecules Vol. 38; no. 24; pp. 9933 - 9938
• Main Authors: Jacob, Josemon, Sax, Stefan, Gaal, Martin, List, Emil J. W, Grimsdale, Andrew C, Müllen, Klaus
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 29.11.2005
• Subjects: Applied sciences; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Heat resistance; Voltage current curve; Solution polycondensation; Self condensation; Photoluminescence; Electroluminescence; Experimental study; Arylene polymer; Conjugated polymer; Electroluminescent device; Optical properties; Preparation; Semiladder polymer; Optical absorption
• DOI: 10.1021/ma0517143
• ISSN: 0024-9297

A new poly(ladder-type pentaphenylene) bearing aryl groups at all bridgehead positions has been prepared. In comparison to previously reported bridged poly(p-phenylene)-type polymers such as polyfluorene and polyindenofluorene, this polymer is optimized for maximum overlap of the blue emission with the sensitivity of the human eye. Furthermore, the introduction of aryl substituents at all the bridgeheads produces a material which shows remarkably stable blue emission in light-emitting diodes and is not subject to oxidative degradation-induced defect formation. In particular, a comparison of the novel fully aryl-substituted polymer with a partially aryl-substituted polymer reveals that the oxidative degradation-induced defect formation can be almost completely eliminated upon aryl substitution.