Document Detail


Interplay between multiple scattering, emission, and absorption of light in the phosphor of a white light-emitting diode.
MedLine Citation:
PMID:  24718195     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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:Ce<sup>3+</sup> 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.
Authors:
V Y F Leung; A Lagendijk; T W Tukker; A P Mosk; W L Ijzerman; W L Vos
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  22     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2014 Apr 
Date Detail:
Created Date:  2014-04-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8190-204     Citation Subset:  IM    
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