White lighting LEDs are almost universally a combination of a blue light-emitting InGaN die and a phosphor that steals some of the blue light and converts it into a broad spectrum peaking at yellow or ...

The advantage to using a blue LED and a yellow phosphor is its high theoretical efficacy, which is attractive for the creation of a cheap, bright white-light source. However, this benefit comes at ...

Experts have since warned that driving around an area lit only by purple LED ... on the phosphor layer, which blocks blue wavelengths, is wearing out, throwing off the color of the light.