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Applied Physics Letters / Volume 96 / Issue 26 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 96, 263302 (2010); http://dx.doi.org/10.1063/1.3457438 (3 pages)

Light-emitting dendrimer film morphology: A neutron reflectivity study

S. V. Vickers1, H. Barcena1, K. A. Knights1, R. K. Thomas1, J.-C. Ribierre2, S. Gambino2, I. D. W. Samuel2, P. L. Burn3, and Giovanna Fragneto4

1Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Rd, Oxford OX1 3TA, United Kingdom
2Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, United Kingdom
3Centre for Organic Photonics and Electronics, The University of Queensland, Chemistry Building, Queensland 4072, Australia
4Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France

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(Received 25 February 2010; accepted 29 May 2010; published online 29 June 2010)

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.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

neutron reflection, organic light emitting diodes, phosphorescence

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3457438

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (3) Tables (1)

Figures (click on thumbnails to view enlargements)

FIG.1
Structures of the singly first generation 1 and second generation 2, and doubly dendronised 3 dendrimers where R = (d17)-2-ethylhexyl.

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FIG.2
Room temperature reflectivity profiles of dendrimers 1, 2, and 3. The profiles are offset for clarity.

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FIG.3
SLD vs position in the film for the five films from the ITO surface to the air interface.

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Tables

Table I. Physical properties of the films of dendrimers 1, 2, and 3. SLD is obtained from NR data analysis; MW and SL are calculated from the molecular formulas; and density and volume are derived from the SLD. DH is obtained from GPC measurements. The errors shown are the fitting errors for a particular film.

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