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Enhancing brightness of Lambertian light sources with luminescent concentrators: the light extraction issue

Abstract : Luminescent concentrators (LC) enable breaking the limit of geometrical concentration imposed by the brightness theorem. They enable increasing the brightness of Lambertian light sources such as (organic) light-emitting diodes. However, for illumination applications, light emitted in the high-index material needs to be outcoupled to free space, raising important light extraction issues. Supported by an intuitive graphical representation, we propose a simple design for light extraction: a wedged output side facet, breaking the symmetry of the traditional rectangular slab design. Angular emission patterns as well as ray-tracing simulations are reported on Ce:YAG single crystal concentrators cut with different wedge angles, and are compared with devices having flat or roughened exit facets. The wedge output provides a simple and versatile way to simultaneously enhance the extracted power (up to a factor of 2) and the light directivity (radiant intensity increased by up to 2.2.)
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https://hal.archives-ouvertes.fr/hal-02358687
Contributor : Frédéric Druon <>
Submitted on : Tuesday, November 12, 2019 - 9:49:53 AM
Last modification on : Wednesday, October 14, 2020 - 4:18:57 AM
Long-term archiving on: : Thursday, February 13, 2020 - 3:38:40 PM

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T. Gallinelli, A. Barbet, F. Druon, F. Balembois, P. Georges, et al.. Enhancing brightness of Lambertian light sources with luminescent concentrators: the light extraction issue. Optics Express, Optical Society of America - OSA Publishing, 2019, 27 (8), pp.11830. ⟨10.1364/OE.27.011830⟩. ⟨hal-02358687⟩

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