LED Phosphors

Phosphors are substances which can absorb energy (including electromagnetic waves (visible light, X-rays, ultraviolet light)), and after energy conversion they will emit all different colors of visible light. 

LED Phosphor white LED

In the case of LED, a phosphor coating is deposited on the LED die, combined with a short wavelength LED such as blue or ultraviolet light to generate white light. They work in the way that the blue or ultraviolet light photons generated in the LED either travels through the phosphor layer without alteration, or they are converted into yellow photons in the phosphor layer. The combinations of the blue and yellow photons generate white light.

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