Materials, Photonic Devices, and Sensors

Development and characterization of high refractive index and high scattering acrylate polymer layers

[+] Author Affiliations
Thomas Eiselt, Thomas Hanemann

Karlsruhe Institute of Technology (KIT), Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344 Germany

Albert-Ludwigs-University, Department of Microsystems Engineering, Georges-Köhler-Allee 102, Freiburg 79110 Germany

Guillaume Gomard, Uli Lemmer

Light Technology Institute (KIT), Engesserstrasse 13, Karlsruhe 76131 Germany

Institute of Microstructure Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany

Jan Preinfalk

Light Technology Institute (KIT), Engesserstrasse 13, Karlsruhe 76131 Germany

Uwe Gleißner

Albert-Ludwigs-University, Department of Microsystems Engineering, Georges-Köhler-Allee 102, Freiburg 79110 Germany

Opt. Eng. 55(11), 117106 (Nov 30, 2016). doi:10.1117/1.OE.55.11.117106
History: Received September 14, 2016; Accepted November 9, 2016
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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%.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Thomas Eiselt ; Guillaume Gomard ; Jan Preinfalk ; Uwe Gleißner ; Uli Lemmer, et al.
"Development and characterization of high refractive index and high scattering acrylate polymer layers", Opt. Eng. 55(11), 117106 (Nov 30, 2016). ; http://dx.doi.org/10.1117/1.OE.55.11.117106


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