《Light-emitting poly(dendrimer)s-SPIE 70511X》.pdfVIP

Light-emitting poly(dendrimer)s a a b b b Jack P. Gunning , Kevin A. Knights , Jean-Charles Ribierre , Ruth E. Harding , Jack W. Levell , Paul L. Burn1a,c, Ifor D.W. Samuel2b aDepartment of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK; bOrganic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK cCentre for Organic Photonics Electronics, School of Molecular and Microbial Sciences, University of Queensland, Chemistry Building, Queensland, 4072, Australia ABSTRACT Organic light-emitting diodes (OLEDs) have great potential for displays and lighting applications. For large area displays the ideal materials would be both phosphorescent and solution processible. These requirements mean that the materials need to be able to be patterned and the most advanced method for forming pixelated displays is inkjet printing. Light-emitting phosphorescent dendrimers have given high efficiency monochrome displays with the emitting layer deposited by spin-coating. However, the viscosity of the dendrimer solutions is insufficient for inkjet printing. We report the development of a new class of light-emitting materials, namely poly(dendrimers) in which a green emissive phosphorescent dendrimer is attached to a poly(styrene) backbone. Free radical polymerization of a dendrimer-styrene monomer gave a poly(dendrimer) with a weight average molecular weight of 24000 and a polydispersi