Most of the white LEDs
currently produced are made by covering a layer of pale yellow phosphor coating on a blue LED (near-UV, wavelengths from 450 nm to 470 nm), which is usually obtained by mixing cerium doped with cerium Aluminum garnet (Ce3 +: YAG) crystals are ground into powder and mixed in a dense adhesive.
When the LED chip is blue
part of the blue light will be this crystal is very efficient conversion into a broad spectrum (spectral center is about 580nm) mainly yellow light. (In fact, the monocrystalline Ce-doped YAG is treated as a scintillator than the phosphor.) Since the yellow light stimulates the red and green receptors in the naked eye and then blends the blue light of the LED itself, it looks like white light , And its color is often called "moonlight white".
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