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Quantum cutting down-conversion (DC) with the emission of two near-infrared photons for each blue photon absorbed is realized in Yb3+-Tb3+ codoped borosilicate glasses. With the excitation of Tb3+ ion by a 484-nm monochromatic light, emission from the 2F5/2 rarr 2F7/2 transition of Yb3+ ions is observed and this emission is proved to originate from the DC between Tb3+ ions and Yb3+ ions. Results shows that maximum quantum efficiency reach as high as 153%, which is comparable with that in oxyfluoride glass ceramics in this system. With the advantages of excellent transparence, easy shaping, good stability, and low cost, Yb3+-Tb3+ codoped borosilicate glasses are potentially used as down-converter layer in silicon-based solar cells.