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Watch liquid nitrogen change the color of lasers and LEDs

When you drop lasers and LEDs into liquid nitrogen, the lights cool down and start turning one color into another. In the GIF above you’ll see it start from a urine yellow to a Mountain Dew color and then to a radiator fluid green and finally some super alien blood goo substance. It’s great!

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Styropyro on YouTube writes:

This experiment works by utilizing liquid nitrogen to cool the semiconductor to -196ºC, robbing it of much of its thermal energy. This causes the “bandgap” energy to increase, thereby increasing the emitted photon energy and decreasing the emission wavelength.

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DISCUSSION

I liked the kid’s play-by-play commentary. He’s kinda the Joe Buck of science.