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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 12682–12691

Micro optical pattern shaping for tailored light emission from Organic LEDs

Norbert Danz, Christoph A. Wächter, Dirk Michaelis, Peter Dannberg, and Michael Flämmich  »View Author Affiliations

Optics Express, Vol. 20, Issue 12, pp. 12682-12691 (2012)

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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.

© 2012 OSA

OCIS Codes
(220.2740) Optical design and fabrication : Geometric optical design
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.3670) Optical devices : Light-emitting diodes
(230.6080) Optical devices : Sources

ToC Category:
Optical Devices

Original Manuscript: March 7, 2012
Revised Manuscript: May 11, 2012
Manuscript Accepted: May 12, 2012
Published: May 21, 2012

Norbert Danz, Christoph A. Wächter, Dirk Michaelis, Peter Dannberg, and Michael Flämmich, "Micro optical pattern shaping for tailored light emission from Organic LEDs," Opt. Express 20, 12682-12691 (2012)

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