Web Release Date: January 31,
Exciton Trapping in an Organic Dendrimer Possessing No Energy Gradient
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Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, and Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Received: November 26, 2007
In Final Form: January 11, 2008
Abstract:
The optical properties of a novel triarylamine dendrimer system are reported. The dendrimer is composed of triarylamine dendrons and a diphenylbenzidine core. Excitations are transferred from the mostly delocalized triarylamine dendrons to the diphenylbenzidine core with a lifetime of 25 ps and 95% yield via a exciton-phonon coupling mechanism rather than the more typical Förster-type mechanism. This work implies that energy traps with over 95% efficiencies can be engineered into triarylamine systems by the addition of biphenylene linkages.
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