Highly branched phosphorescent dendrimers

Neil Cumpstey; Raghu N. Bera; Ruth E. Harding; Paul L. Burn; Ifor D. W. Samuel

doi:10.1117/12.620443

9 October 2005 Highly branched phosphorescent dendrimers

Neil Cumpstey, Raghu N. Bera, Ruth E. Harding, Paul L. Burn, Ifor D. W. Samuel

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 593725 (2005) https://doi.org/10.1117/12.620443
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Neil Cumpstey, Raghu N. Bera, Ruth E. Harding, Paul L. Burn, and Ifor D. W. Samuel "Highly branched phosphorescent dendrimers", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593725 (9 October 2005); https://doi.org/10.1117/12.620443

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