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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 8190–8204

Interplay between multiple scattering, emission, and absorption of light in the phosphor of a white light-emitting diode

V. Y. F. Leung, A. Lagendijk, T. W. Tukker, A. P. Mosk, W. L. IJzerman, and W. L. Vos  »View Author Affiliations


Optics Express, Vol. 22, Issue 7, pp. 8190-8204 (2014)
http://dx.doi.org/10.1364/OE.22.008190


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Abstract

We study light transport in phosphor plates of white light-emitting diodes (LEDs). We measure the broadband diffuse transmission through phosphor plates of varying YAG:Ce3+ density. We distinguish the spectral ranges where absorption, scattering, and re-emission dominate. Using diffusion theory, we derive the transport and absorption mean free paths from first principles. We find that both transport and absorption mean free paths are on the order of the plate thickness. This means that phosphors in commercial LEDs operate well within an intriguing albedo range around 0.7. We discuss how salient parameters that can be derived from first principles control the optical properties of a white LED.

© 2014 Optical Society of America

OCIS Codes
(160.5690) Materials : Rare-earth-doped materials
(230.3670) Optical devices : Light-emitting diodes
(290.1990) Scattering : Diffusion
(290.4210) Scattering : Multiple scattering
(290.5850) Scattering : Scattering, particles
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Optoelectronics

History
Original Manuscript: November 28, 2013
Revised Manuscript: February 24, 2014
Manuscript Accepted: February 24, 2014
Published: April 1, 2014

Citation
V. Y. F. Leung, A. Lagendijk, T. W. Tukker, A. P. Mosk, W. L. IJzerman, and W. L. Vos, "Interplay between multiple scattering, emission, and absorption of light in the phosphor of a white light-emitting diode," Opt. Express 22, 8190-8204 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-7-8190


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