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Why It Was Almost Impossible to Make the Blue LED (youtu.be)

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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[–] collapse_already@lemmy.ml 4 points 9 months ago (1 children)

I imagine that lithography for integrated circuits would be an application, assuming you could make an appropriate photo-resist. The shorter the wavelength, the smaller the possible feature size. Current lithography relies on constructive and destructive interference between wavelengths to create super small features.

[–] ColeSloth@discuss.tchncs.de 2 points 9 months ago (1 children)

As far as "light" it's already capped out, then. Going shorter there's only x-ray and then Gamma ray. Gamma ray lithography sounds bad-ass and dangerous.

[–] JATtho@lemmy.world 1 points 9 months ago (1 children)

Gamma rays have so much energy that they are basically emitted only by nuclear processes, as far as I know.

[–] ColeSloth@discuss.tchncs.de 1 points 9 months ago

Until we stick it in an led!

I guess past the uv range we should just call them ED, but then you only think about erectile dysfunction.