Light-emitting poly(dendrimer)s

Jack P. Gunning; Kevin A. Knights; Jean-Charles Ribierre; Ruth E. Harding; Jack W. Levell; Paul L. Burn; Ifor D. W. Samuel

doi:10.1117/12.800083

2 September 2008 Light-emitting poly(dendrimer)s

Jack P. Gunning, Kevin A. Knights, Jean-Charles Ribierre, Ruth E. Harding, Jack W. Levell, Paul L. Burn, Ifor D. W. Samuel

Author Affiliations +

Proceedings Volume 7051, Organic Light Emitting Materials and Devices XII; 70511X (2008) https://doi.org/10.1117/12.800083
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

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 polydispersity of 3.6. A dilute solution of the dendrimer had a viscosity 15% higher than the neat solvent. Comparison of the photophysical studies of the poly(dendrimer) versus a model monomer dendrimer showed that the PL spectrum was broader and red-shifted, and the PL quantum yield around 50% lower. This was attributed to intermolecular interactions of the emissive dendrimers, which are held closely together on the polymer backbone.

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Jack P. Gunning, Kevin A. Knights, Jean-Charles Ribierre, Ruth E. Harding, Jack W. Levell, Paul L. Burn, and Ifor D. W. Samuel "Light-emitting poly(dendrimer)s", Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70511X (2 September 2008); https://doi.org/10.1117/12.800083

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KEYWORDS

Dendrimers

Polymers

Polymerization

Magnesium

Chromatography

Organic light emitting diodes

Inkjet technology

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