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Proceedings Paper

Highly branched phosphorescent dendrimers
Author(s): Neil Cumpstey; Raghu N. Bera; Ruth E. Harding; Paul L. Burn; Ifor D. W. Samuel
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Paper Abstract

A simple convergent procedure, involving the Diels-Alder reaction between 2,3,4,5-tetraphenylcyclopentadienone with an acetylene-substituted 2-phenylpyridine and subsequent complexation with iridium(III), has been developed for the formation of highly branched phosphorescent dendrimers. The procedure is demonstrated with the preparation of a first generation dendrimer composed of a fac-tris(2-phenylpyridyl)iridium(III) core with a single dendron attached to phenyl ring of each of the ligands. Each dendron is comprised of a branching phenyl unit with a further four phenyl groups attached. The lack of surface groups on the dendrons was found to reduce solubility of the dendrimers and allow strong intermolecular interactions of the emissive and electroactive cores in neat films. This was evidenced by a decrease in the photoluminescence quantum yield in going from solution to the solid state.

Paper Details

Date Published: 9 October 2005
PDF: 9 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593725 (9 October 2005); doi: 10.1117/12.620443
Show Author Affiliations
Neil Cumpstey, Univ. of Oxford (United Kingdom)
Raghu N. Bera, Univ. of St. Andrews (United Kingdom)
Ruth E. Harding, Univ. of St. Andrews (United Kingdom)
Paul L. Burn, Univ. of Oxford (United Kingdom)
Ifor D. W. Samuel, Univ. of St. Andrews (United Kingdom)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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