powder samples are prepared by high temperature solid-phase reaction method in this paper. Near-infrared emission properties of these powder materials are investigated including emission properties of Cr3+
, luminescence lifetimes of Cr3+
and comparison of their population time. Optimal doping concentration of Yb3+
(10%) is given. Experiments indicate that the broadband spectral conversion makes the Yb3+
radiation transition obtain a favorable increase around 1 000 nm by the efficient energy transfer from Cr3+
, which laids a solid foundation to enhance solar photovoltaic conversion efficiency.