This work investigated the near-infrared (NIR) emission properties of mCe(3+), xNd(3+) codoped Sr3-m-x(Si1-m-xAlm+x)O-5 phosphors. Samples with various doping concentrations were synthesized by the high-temperature solid-state reaction. Al3+ ions have the ability to promote Ce3+ ions to enter into the Sr2+ sites and to improve the visible emission of Ce3+. Thus the NIR emission of Nd3+ is enhanced by the energy-transfer process, which occurred from Ce3+ to Nd3+. The device based on these NIR emission phosphors is fabricated and combined with a commercial c-Si solar cell for performance testing. Short-circuit current density of the solar cell is increased by 7.7%. Results of this work suggest that the Sr2.95Si0.95Al0.05O5:0.025Ce(3+), 0.025Nd(3+) phosphors can be used as spectral convertors to improve the efficiency of c-Si solar cell.