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Spectrum of LED immersed in liquid nitrogen

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First published at 10:14 UTC on May 29th, 2018.

#science
#physics

Dr.Mario

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We have inserted a red LED into liquid nitrogen (which means, we decreased its temperature to -195 °C) while observing its emission spectrum with an optical spectrometer. We noticed that the peak of the spectrum moved towards the shorter wavelengths.
This is actually an expected result, because with decreased temperature the inter-atomic distance in the crystal lattice of the semiconductor decreases. One consequence of such distance decrease is an increase of the semiconductor's band-gap, which then causes the emitted photons to have a higher energy.

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