Watch Liquid Nitrogen Change The Colour Of Lasers And LEDs

Watch liquid nitrogen change the colour of lasers and LEDs

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

Styropyro on YouTube writes:

This experiment works by utilising 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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