Interplay between multiple scattering, emission, and absorption of light in the phosphor of a white light-emitting diode
| Abstract | We study light transport in phosphor plates of white light-emittingdiodes (LEDs). We measure the broadband diffuse transmission throughphosphor plates of varying YAG:Ce density. We distinguish the spectralranges where absorption, scattering, and re-emission dominate. Usingdiffusion theory, we derive the transport and absorption mean free pathsfrom first principles. We find that both transport and absorption meanfree paths are on the order of the plate thickness. This means thatphosphors in commercial LEDs operate well within an intriguing albedorange around 0.7. We discuss how salient parameters that can be derivedfrom first principles control the optical properties of a white LED. |
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| Authors | V. Y. F. Leung, A. Lagendijk, T. W. Tukker, A. P. Mosk, W. L. IJzerman, and W. L. Vos |
| Year of publication | 2014 |
| Date published | 04/2014 |
| Journal | Opt. Express |
| Volume | 22 |
| Pages | 8190-8204 |
| Keywords | absorption, emission, multiple scattering, white light-emitting diodes |