To reduce energy losses by thermalization of charge carriers in a silicon solar cell, quantum-cutting luminescent materials are desired for the efficient downconversion of UV–visible radiation into near-IR radiation. In this Letter, quantum cutting involving emission of two near-IR photons for each UV-blue photon absorbed is demonstrated in nanocrystals embedded in transparent bulk-glass ceramics. Upon excitation of an ion with a UV-blue photon, ions emit two near-IR photons through an efficient two-step energy transfer from to with acting as the intermediate state.
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