this post was submitted on 09 Feb 2024
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Why It Was Almost Impossible to Make the Blue LED (youtu.be)
submitted 9 months ago by [email protected] to c/[email protected]
203 comments fedilink hide all child comments
 

The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.

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[–] [email protected] 67 points 9 months ago (1 children)

Making blue LEDs is easy. Just make a red one, then move towards it really fast.

[–] [email protected] 3 points 9 months ago (2 children)

Doppler effect?

[–] [email protected] 1 points 9 months ago

Yeah but it only works if the source is moving towards the observer