The conventional materials perform downconversion of 1 photon from a shorter to a longer wavelength. There are some materials that upconvert IR light to UV, on the basis of two or more photon absorption. However, I am interested as to whether there is material that can absorb blue photons (450nm) and emits UVC photons (280 nm)?
You can see this paper Environ. Sci. Technol. 2011, 45, 3680–3686 which reported the synthesis of Pr3+ activated Y2SiO5. It converts visible light into UVC.
Pr3+, Gd3+, Li activated hosts, can be a good option as suggested by Rahman, but yield is very low. May be you can incorporate some other ions so that you can increase the absorption in the region of your interest. I am not sure but some dyes may help you to increase the absorption at 450 nm.
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