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Proceedings Paper

Light-emitting poly(dendrimer)s
Author(s): Jack P. Gunning; Kevin A. Knights; Jean-Charles Ribierre; Ruth E. Harding; Jack W. Levell; Paul L. Burn; Ifor D. W. Samuel
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Paper 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.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70511X (2 September 2008);
Show Author Affiliations
Jack P. Gunning, Univ. of Oxford (United Kingdom)
Kevin A. Knights, Univ. of Oxford (United Kingdom)
Jean-Charles Ribierre, Univ. of St. Andrews (United Kingdom)
Ruth E. Harding, Univ. of St. Andrews (United Kingdom)
Jack W. Levell, Univ. of St. Andrews (United Kingdom)
Paul L. Burn, Univ. of Oxford (United Kingdom)
The Univ. of Queensland (Australia)
Ifor D. W. Samuel, Univ. of St. Andrews (United Kingdom)

Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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