Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Optical Properties I
HL 44.8: Vortrag
Mittwoch, 9. März 2016, 12:00–12:15, H10
Tailored Scattering Layers to Homogenize Light Emission from Large-Area Organic Light-Emitting Diodes — •Frederik Mayer1, Robert Schittny1, Amos Egel2, Andreas Niemeyer1, Jan Preinfalk2, Ulrich Lemmer2, and Martin Wegener1,3 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 2Light Technology Institute and Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 3Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
For large-area organic light-emitting diodes, the relatively high sheet resistance of the transparent electrode layer is often compensated for by adding a metallic electrode grid on top. However, these electrodes cast a shadow, leading to a spatially inhomogeneous light emission of the OLED. In this talk, based on recent findings on diffusive-light cloaking, we present a method to homogenize this light emission and thereby hide the contact grid by adding an additional light-scattering layer on top, consisting of regions with different concentrations of scattering particles. We design this light-scattering layer using Monte-Carlo simulations of light transport through multiply-scattering media and show corresponding experiments on a scaled-up model structure.