Abstract
We report that Ce3+ can be an efficient sensitizer for Yb3+ and a broadband absorber for blue solar spectra. The broadband excitation for near-infrared (NIR) emission is ranged from 350nm to 500nm. The allowed 4f→5d transition and the adjustable lowest 5d level make the energy transfer from Ce3+ to Yb3+ efficiently. Therefore the quantum efficiency (QE) is also very high up to 154.3%. Furthermore, the energy of Yb3+2F7/2→2F5/2 transition matches well with the band gap of a single-junction Si. Given the broad excitation band, high absorption coefficient and excellent mechanical, thermal, and chemical stability, this system can be used as down-conversion (DC) layer for solar cells.
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