How LEDs are made (2014)(learn.sparkfun.com) |
How LEDs are made (2014)(learn.sparkfun.com) |
Why It Was Almost Impossible to Make the Blue LED
Naturally, he realized that the clear plastic blob it was inside was an insulator. How to fix - he filed it down to the bare minimum that would hold it together. This time, it would light up a whole room!
Liquid nitrogen is all one needs to make bright LEDs.
While I'll readily admit to remembering nothing from her class, I took physical chemistry [πchem] from one of the co-inventors [2] of white LEDs. This is where my own limited fleshtelligence began searching for Heisenberg's god...
[πchem] e.g: how metals behave when struck with electron[-like thing]s)
[2] ONE of two known-methods, then
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But yes, once any process exists, it's usually only a matter of heat management to keep it working full wall-slam-ed-ly [ƒpu]
[ƒpu] which is why to run GPU fanspeeds high enough to keep <65°C – don't care about the noisiness if they'll then last forever; change your car's oil (and keep topped-up)
It takes studying at Caltech to realize semiconductors output are limited by their heat generation? I thought everyone knew this.
2. "they can align over 80 per minute or about 40,000 per day." - terrifying, as I assume this is a metric workers are held against :O
80 per minute is less than a second for what sounds like several movements - move the die over, align, push down, move it out. While your eye is stuck to the microscope.
I'd love to know more about how candle-flicker LEDs are assembled, because that source of [apparent] randomness is very interesting to me. I'm not sure if it's an LFSR or true HRNG, and I'm sure there are lots of different designs out there for the simulcrum of natural candle light.
You can get a better sense of their operation if you wire up the LED to an audio circuit where they'll make a pleasingly happy beep boop sound.
(Edit: There was an article somewhere that explored the entropy and concluded that their component operated on a LFSR, as they binned all the brightness outputs into integer values and waves hands did fancy math to conclude that the brightness it was likely modulated by a LFSR. I'll see if I can find it.)
(Edit 2: https://cpldcpu.com/2013/12/08/hacking-a-candleflicker-led/ here's that article for those interested. https://news.ycombinator.com/item?id=25530895 was the original submission to HN.)
De-doming these things (as discussed in another comment) is quite a chore; I de-domed 30 LEDs (candle-flicker, of course) in order to diffuse the light and fit under the keys of a small 3x10 keyboard I was building. But the effect is neat when the backlight is on as it almost looks like a shadow is randomly typing away as the entire array flickers.
One of the things I vaguely remember was reading somewhere that working on this LED manufacturing severely damages the workers' eyes. I don't know how much of it is true and if it is, whether that is still the case.
Surely 10 years on that isn't true anymore??
"I think I can safely say that nobody understands quantum mechanics" -- Richard Feynman