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Optical Engineering

Development and characterization of high refractive index and high scattering acrylate polymer layers
Author(s): Thomas Eiselt; Guillaume Gomard; Jan Preinfalk; Uwe Gleissner; Uli Lemmer; Thomas Hanemann
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Paper Abstract

In this work, we develop a wet-processable scattering layer exhibiting a high refractive index that can be used in organic light-emitting diodes for light outcoupling purposes. The composite layers contain an acrylate casting resin, benzylmethacrylate, and phenanthrene, which is employed to increase the refractive index. The mixtures are first rheologically characterized and then polymerized with heat and UV radiation. For the refractive index measurements, the polymerized samples require a planar surface without air bubbles. To produce flat samples, a special construction consisting of a glass plate, a teflon sheet, a silicone ring (PDMS mold), another teflon sheet, and another glass plate is developed. Glue clamps are used to hold the construction together. The refractive index of the samples can be increased from 1.565 to 1.585 at 20°C at a wavelength of 589 nm following the addition of 20 wt% phenanthrene. A master mixture with a high refractive index is taken for further experiments. Nanoscaled titanium dioxide is added and dispersed into the master mixture and then spin coated on a glass substrate. These layers are optically characterized. Most of the presented layers present the expected haze of over 50%.

Paper Details

Date Published: 30 November 2016
PDF: 6 pages
Opt. Eng. 55(11) 117106 doi: 10.1117/1.OE.55.11.117106
Published in: Optical Engineering Volume 55, Issue 11
Show Author Affiliations
Thomas Eiselt, Karlsruher Institut für Technologie (Germany)
Univ. of Freiburg (Germany)
Guillaume Gomard, Karlsruher Institut für Technologie (Germany)
Jan Preinfalk, Karlsruher Institut für Technologie (Germany)
Uwe Gleissner, Univ. of Freiburg (Germany)
Uli Lemmer, Karlsruher Institut für Technologie (Germany)
Thomas Hanemann, Karlsruher Institut für Technologie (Germany)
Univ. of Freiburg (Germany)

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