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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 10 — May. 15, 2014
  • pp: 3058–3061

Light extraction from luminescent light sources and application to monolithic ceramic phosphors

Alan Lenef, John F. Kelso, and Alan Piquette  »View Author Affiliations


Optics Letters, Vol. 39, Issue 10, pp. 3058-3061 (2014)
http://dx.doi.org/10.1364/OL.39.003058


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Abstract

An extension of a theorem for light extraction [Adv. Opt. Technol. 2, 291 (2013)] from a higher index luminescent body (LED or phosphor) through an extracting surface into a lower index output medium is derived. The result is valid for both geometric and diffractive surface structures. Using this bound and radiation transport calculations, we show that extraction from LEDs or phosphors requires a combination of cavity effects to enhance radiance behind the extracting surface and scattering or diffraction to couple trapped total-internal-reflection modes to propagating modes. The treatment applies to macroscopic luminescent sources whose thickness exceeds the longitudinal coherence length of the luminescent radiation.

© 2014 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(260.3800) Physical optics : Luminescence
(290.4210) Scattering : Multiple scattering
(110.2945) Imaging systems : Illumination design

ToC Category:
Optical Devices

History
Original Manuscript: March 6, 2014
Revised Manuscript: April 9, 2014
Manuscript Accepted: April 11, 2014
Published: May 15, 2014

Citation
Alan Lenef, John F. Kelso, and Alan Piquette, "Light extraction from luminescent light sources and application to monolithic ceramic phosphors," Opt. Lett. 39, 3058-3061 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-10-3058


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