Color CRTs have three different phosphors, and the beams have to fire at the correct color phosphor. The best part of the video is the part where they tear apart an actual CRT, something you don ...

In other LEDs the phosphor layer was physically separated from the backing, exposing the underlying LEDs completely. The color of these damaged modules was significantly shifted toward the blue ...

The color shift began after they had been operating for three to four years. What the researchers found was that in some of the modules, the yellowish phosphor and silicon mixture that filtered ...

They need to either combine different LED colors (red, green, blue) or use a blue LED and cover it with yellow phosphor that filters blue wavelengths and ultimately produces a bright white light.