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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]

204 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] 2 points 5 months ago

This video is recommended by Tournesol:
[33🌻] Veritasium: Why It Was Almost Impossible to Make the Blue LED

#Tournesol is an open-source web tool by a non profit organization, evaluating the overall quality of the information in videos from community made comparisons, to fight against misinformation and dangerous content.

[–] [email protected] 66 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] 3 points 9 months ago

https://en.m.wikipedia.org/wiki/Redshift#Blueshift

Essentially yes

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

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

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