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

Y.F.V. Leung, Aart Lagendijk, T.W. Tukker, Allard Mosk, W.L. IJzerman, Willem L. Vos

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)
78 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)8190-8204
Number of pages14
JournalOptics express
Volume22
Issue number7
DOIs
Publication statusPublished - 2014

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