Why It Was Almost Impossible to Make the Blue LED
Why It Was Almost Impossible to Make the Blue LED
The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.
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Making blue LEDs is easy. Just make a red one, then move towards it really fast.
Doppler effect?
https://en.m.wikipedia.org/wiki/Redshift#Blueshift
Essentially yes
Yeah but it only works if the source is moving towards the observer
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