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
Colour generation, red LEDs were first, then green
Blue was very hard to make
But with red , green and blue you can make other colours with the RGB mix – allowing them to mimic what cathode ray tubes / phosphor dot TV / monitors did at much higher density
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