Increase in Wavelength of an LED Immersed in Liquid Nitrogen

AI Thread Summary
Immersing LEDs in liquid nitrogen typically results in a decrease in emitted wavelength, but the experiment shows an initial decrease followed by an increase in wavelength. For instance, a yellow LED first appears greenish and then shifts back to yellow-orange. This unexpected behavior contradicts common predictions found in online sources. The experimenter is seeking explanations for this phenomenon, as existing literature does not address it. Further insights or theories from the community could help clarify this unusual observation.
caleb5040
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Hi,

I've been working on an experiment where I dip LEDs into liquid nitrogen and note the color change. All online sources I've seen predict that the wavelength of the light emitted by the LED will decrease upon immersion.
What I've been observing, however, is a sudden decrease in wavelength followed by a definite increase in wavelength. So, for example, a yellow LED turned green-ish at first, and then rapidly changed to yellow-orange.

I've been looking around for an explanation of why I am getting this (opposite) effect, but haven't had any luck. Does anyone have any ideas?
 
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