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) <i>versus</i> 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.