Abstract
Yb3+ and Tb3+ singly doped and Tb3+–Yb3+ co-doped Ca5(BO3)3F phosphors were prepared by a solid state reaction method. The luminescence emission and excitation spectra as well as the luminescence decay curves were investigated. The emission bands of Yb3+ ion are located around 1000nm, matching well with the optimal response of Si-based solar cells. Tb3+ can be a sensitizer for Yb3+ in the host. The energy transfer from Tb3+ to Yb3+ was investigated, the energy transfer mechanism was proposed as cooperative energy transfer. Tb3+ concentration dependent quantum efficiency was calculated and the maximum efficiency approached 115.5%.
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