Light-emitting dendrimer film morphology: A neutron reflectivity study

S. V. Vickers, H. Barcena, K. A. Knights, R. K. Thomas, J. C. Ribierre, S. Gambino, I. D.W. Samuel, P. L. Burn, Giovanna Fragneto

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Abstract

We have used neutron reflectivity (NR) measurements to probe the physical structure of phosphorescent dendrimer films. The dendrimers consisted of fac-tris(2-phenylpyridyl)iridium(III) cores, biphenyl-based dendrons (first or second generation), and perdeuterated 2-ethylhexyloxy surface groups. We found that the shape and hydrodynamic radius of the dendrimer were both important factors in determining the packing density of the dendrimers. "Cone" shaped dendrimers were found to pack more effectively than "spherical" dendrimers even when the latter had a smaller radius. The morphology of the films determined by NR was consistent with the measured photoluminescence and charge transporting properties of the materials.

Original languageEnglish
Article number263302
JournalApplied Physics Letters
Volume96
Issue number26
DOIs
Publication statusPublished - Jun 28 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Vickers, S. V., Barcena, H., Knights, K. A., Thomas, R. K., Ribierre, J. C., Gambino, S., Samuel, I. D. W., Burn, P. L., & Fragneto, G. (2010). Light-emitting dendrimer film morphology: A neutron reflectivity study. Applied Physics Letters, 96(26), [263302]. https://doi.org/10.1063/1.3457438