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Proceedings Paper

Effect of generation on the electronic properties of light-emitting dendrimers
Author(s): Paul L. Burn; Mounir Halim; Jonathan N. G. Pillow; Ifor D. W. Samuel
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Paper Abstract

We have compared the optical and electronic properties of a series of porphyrin centered dendrimers containing stilbene dendrons. The first and second generation dendrimers could be spin-coated from solution to form good quality thin films. Incorporation into single layer light-emitting diodes gave red-light emission with maximum external quantum efficiencies of 0.02% and 0.04% for the first and second generation dendrimers respectively. We have determined by photoluminescence studies that energy can be transferred efficiently from the stilbene dendrons to the porphyrin core and that PL emission is from the core. Cyclic voltammetry studies on the dendrimers show that the reductions are porphyrin centered with the dendrons only affecting the rate of heterogeneous electron transfer between the electrode and the dendrimers. This suggests that charge mobility within a dendrimer film in an LED will be affected by the porphyrin edge to porphyrin edge distance. We have studied the hydrodynamic radii of the dendrimers by gel permeation chromatography and found as expected that the average porphyrin edge to dendron edge distance increases with generation. This is consistent with the slowing of heterogeneous electron transfer observed in the cyclic voltammetry on increasing the generation number and suggests that the dendrons are interleaved in the solid state to facilitate charge transport.

Paper Details

Date Published: 17 December 1999
PDF: 9 pages
Proc. SPIE 3797, Organic Light-Emitting Materials and Devices III, (17 December 1999); doi: 10.1117/12.372741
Show Author Affiliations
Paul L. Burn, Univ. of Oxford (United Kingdom)
Mounir Halim, Univ. of Durham (United Kingdom)
Jonathan N. G. Pillow, Univ. of Oxford (United Kingdom)
Ifor D. W. Samuel, Univ. of Durham (United Kingdom)

Published in SPIE Proceedings Vol. 3797:
Organic Light-Emitting Materials and Devices III
Zakya H. Kafafi, Editor(s)

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