In this paper ,the advantages and disadvantages of the methods to achieve White LED are reviewed, and
phosphor-converted white LEDs are discussed in detail. In the case of blue chip exciting YAG phosphor to get white
LED, use Mie scattering theory to construct physical model, then analyze how the package, concentration, thickness and particle size of phosphor work on extraction efficiency, spatial Chroma uniformity and color temperature of white LED. The conclusion of this paper advances the application of LED solid-state light source. In the end, the paper puts forward the direction and focus of phosphor research.
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