When cooled in liquid nitrogen at -196°C, the band gap of the LED semiconductor increases. This causes an increase in the energy of the emitted photons and therefore a decrease in emission wavelength. When the yellow LED (λ = 570nm) is submerged it shifts towards emitting a green color (λ = 510nm). When the red LED (λ = 650nm) is submerged it emits a more orange color (λ = 590nm).
Source: https://youtu.be/5PquJdIK_z8
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