video of an LED failing and cross-sectioning itself right down the middle!
pic.twitter.com/HE7o74Nygd
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annotated version of the LED that failed and cross sectioned itself.pic.twitter.com/b9Sk7HuZED
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what's REALLY fascinating is to try and figure out the failure process: 1. LED die continues to light, but the current is quite high and it heats up 2. the bond wire heats up and glows (you can see the light shift downward in the video slightly)
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3. pressure builds up inside, the softened plastic starts to bulge out of the bottom 4. catastrophic failure! the plastic shears along lines of stress created when the plastic was originally molded.
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Would there be different crack pattern if the heating was much quicker, so the large metal leads don't significantly heat up and concentrate the stresses at the edges? Like if you dumped 100s of Watts through it.
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probably! one thing would be to dump a high voltage capacitor bank into one to see what happens.
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Disassembly by magic smoke
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It's become almost impossible to find smoke re-injectors these days. I used to keep a few different nozzle sizes on my bench.
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Genuinely fascinating. During my apprenticeship, we'd sometimes try to make this sort of LED blow up for fun. Sometimes you make them almost dissappear entirely, only leaving behind the smell of terror. Horrible smell!
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Wow. Looking at it, I can see how it's not perfectly flat. I definitely want to see that video now!
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