using the understanding that energy in any form cannot be indefinitely absorbed, in this case I speak of visible light. Is there a material\substance either man made or natural that will take visible light and convert\reflect it back as Ultra Violet light?
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$\begingroup$ Did you see en.wikipedia.org/wiki/Second-harmonic_generation? A typical doubler crystal is KDP. $\endgroup$– CuriousOneCommented Jan 28, 2016 at 21:55
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Certain phosphors will work in that manner. They will absorb 2 photons of visible light for every 1 photon they re-emit in the ultraviolet.
