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
Not and ELI5, but there’s a [good layman’s explanation of the invention of blue LEDs on Veritasium YouTube channel](https://youtu.be/AF8d72mA41M?si=ClFUxIXJ5BbY5c8q).
I though it was pretty interesting to hear the story behind it, and it was relatively easy to follow, but not for a five-year-old.
Latest Answers