As far as I understand, you need to be able to mix red, green and blue light to get white light and replace lightbulbs. But the earliest example I can find of white LEDs used a blue LED and a yellow (apparently the result of mixing red and green light) phosphor coating to scatter the light across the visible spectrum. Why couldn’t something similar be done with a red LED and a cyan (mixing blue and green) coating/cover to produce white light instead?
In: Engineering
We use LEDs for stuff like photolithography. Shorter wavelengths we can use the better for various reasons. Blue or violet is the shorter end of the visible spectrum. We want as short as possible for photolithography.
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