superlong UV persistent luminescence

What is it about?

Some of the rare earth-doped materials show an interesting feature – namely long-lasting (persistent) luminescence. We explored the optical and persistent luminescence properties of calcium metaborate phosphor for a possible application in phototherapy. The overall luminescence properties in the host are expected to be determined by the presence/absence of defects after the introduction of dopant ions into the lattice. Upon excitation with a 254 nm UV lamp, a superlong persistent luminescence in the UVA1 region (340–400 nm, blacklight) was observed, lasting for at least 15 h, with an excellent reproducibility. The work is carried out using different approaches, combined theoretical and experimental, to understand the mechanism of such long luminescence.

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