Abstract
A near-infrared phosphor, Sr3SiO5:Ce3+,Yb3+, is developed as a potential solar spectral converter for Si solar cells. The diffuse reflection, photoluminescence excitation, and emission spectra at room temperature and at 3 K were investigated. These results show that the Sr3SiO5:Ce3+,Yb3+ phosphor has broadband absorptions peaking at 415 nm which can efficiently facilitate the UV–blue part of the solar spectrum when compared with Sr3SiO5:Yb3+. Furthermore, it can give an intense emission around 1000 nm via an energy transfer process from Ce3+ to Yb3+, matching well with the optimal spectral response of Si solar cells. The cooperative quantum cutting mechanism is also proposed.
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