Micro optical pattern shaping for tailored light emission from organic LEDs

Micro optical pattern shaping for tailored light emission from organic LEDs

The application of large area OLEDs for lighting and signage purposes potentially requires essential changes of the common Lambert-like emission pattern. We demonstrate an array based micro optical approach for pattern shaping of area light sources based on distorted Fourier imaging of an aperture a...

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Veröffentlicht in:Optics express 2012-06, Vol.20 (12), p.12682-12691
Hauptverfasser: Danz, Norbert, Wächter, Christoph A, Michaelis, Dirk, Dannberg, Peter, Flämmich, Michael
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container_issue 12
container_start_page 12682
container_title Optics express
container_volume 20
creator Danz, Norbert
Wächter, Christoph A
Michaelis, Dirk
Dannberg, Peter
Flämmich, Michael
description The application of large area OLEDs for lighting and signage purposes potentially requires essential changes of the common Lambert-like emission pattern. We demonstrate an array based micro optical approach for pattern shaping of area light sources based on distorted Fourier imaging of an aperture array with a micro lens array. Narrow angular emission patterns of ± 35° and ± 18° FWHM obtained experimentally demonstrate the pattern shaping with low stray light levels. The internal recycling of initially rejected photons yields intensity enhancements exceeding a factor two in forward direction that is still well below the theoretical limits due to limited reflectivity.
doi_str_mv 10.1364/OE.20.012682
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title Micro optical pattern shaping for tailored light emission from organic LEDs
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