NDLI: Effects of YAG: Ce Phosphor Particle Size on Luminous Flux and Angular Color Uniformity of Phosphor-Converted White LEDs

Content Provider	IEEE Xplore Digital Library
Author	Zong-Yuan Liu Cheng Li Bin-Hai Yu Yao-Hao Wang Han-Ben Niu
Copyright Year	2005
Abstract	Effects of YAG: Ce phosphor particle size on the luminous flux and angular color uniformity have been studied by using Monte Carlo ray-tracing simulation. A white LED model basing on Cree XLamp is constructed. The phosphor particle size is changed from 2 to 20 μm. Different simulation cases are carried out by changing the phosphor concentration and thickness. Results revealed that the luminous flux and angular color uniformity have complex relationships with the particle size depending on applied phosphor concentration and desired color temperature. A general finding is that an increase of the particle size is beneficial for the improvement of luminous flux but leads to worse angular color uniformity. A 2 μm particle achieves not only the best angular color uniformity but the lowest luminous flux. A particle size larger than 10 μm generates the highest luminous flux at low color temperature when the concentration is around 1.5 g/cm³. A particle size between 2 μm and 10 μm shows combined moderate performance when the phosphor concentration is higher than 2 g/cm³. To realize the best combined performance, a particle size around 6 μm is suggested.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	329
Ending Page	335
Page Count	7
File Size	898830
File Format	PDF
ISSN	1551319X
Volume Number	8
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Color Phosphors Light emitting diodes Scattering Absorption Temperature dependence Stimulated emission angular color uniformity Light-emitting diodes (LEDs) packaging phosphor particle size luminous flux
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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