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Cr^3^+/Yb^3^+-codoped glasses were studied as broadband down shifting
materials for improving solar cells' efficiency. We observed Foster
resonance energy transfers (FRET) from Cr^3^+: ^4T"2"g to Yb^3^+:
^2F"5"/"2. The ET efficiency was up to 84 %, and the measured quantum yield
(QY) reached 21.51 %. The glass can convert solar photons in super wide
UV-Vis range to near infrared photons with the minimum quantum yields
larger than 10%. Thus, such materials can be applied for improving silicon
solar cells' conversion efficiency.
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