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submitted 9 months ago by Whirling_Cloudburst@lemmy.world to c/technology@lemmy.world

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

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[-] Agent641@lemmy.world 67 points 9 months ago

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

[-] lemmesay@discuss.tchncs.de 3 points 9 months ago

Doppler effect?

[-] mikezeman@lemm.ee 3 points 9 months ago

Essentially yes

[-] Sentau@discuss.tchncs.de 1 points 9 months ago

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

this post was submitted on 09 Feb 2024

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