期刊
OPTICS EXPRESS
卷 22, 期 7, 页码 8190-8204出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.008190
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资金
- Dutch Technology Foundation STW [11985]
- FOM
- NWO
- ERC
We study light transport in phosphor plates of white lightemitting 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. (C) 2014 Optical Society of America
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