Whirling_Cloudburst@lemmy.world to

Technology@lemmy.worldEnglish · 2 years ago

Why It Was Almost Impossible to Make the Blue LED

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Why It Was Almost Impossible to Make the Blue LED

Whirling_Cloudburst@lemmy.world to

Technology@lemmy.worldEnglish · 2 years ago

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

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Sentau@discuss.tchncs.de
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2 years ago
Yeah but it only works if the source is moving towards the observer

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