I understand certain phosphors will absorb ultraviolet light and then re-emit in the visible spectrum, for example "glow in the dark" paint and toys. Are there any material that go the other way around ? If yes, are any of them strong enough to produce visible reactions solely based on the amount of radiation emitted by the human body ?
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If the emitted photon has more energy, the energy difference is called an anti-Stokes shift;[5] this extra energy comes from dissipation of thermal phonons in a crystal lattice, cooling the crystal in the process. Yttrium oxysulfide doped with gadolinium oxysulfide is a common industrial anti-Stokes pigment, absorbing in the near-infrared and emitting in the visible portion of the spectrum. (https://en.wikipedia.org/wiki/Stokes_shift)
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$\begingroup$ ah ha! Those are the words I need to search in order to get results, thank you my good man. I will accept your response as soon as I can $\endgroup$ Commented Nov 18, 2016 at 1:32