Near-infrared emission properties of Yb³⁺ ions sensitized by Cr³⁺ ions in YAG powder materials

YAG: 0.02Cr³⁺,yYb³⁺ 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⁺ and Yb³⁺, luminescence lifetimes of Cr³⁺: ⁴T₂ and Yb³⁺: ²F_5/2 and comparison of their population time. Optimal doping concentration of Yb³⁺(10%) is given. Experiments indicate that the broadband spectral conversion makes the Yb³⁺: ²F_5/2→²F_7/2 radiation transition obtain a favorable increase around 1 000 nm by the efficient energy transfer from Cr³⁺ to Yb³⁺, which laids a solid foundation to enhance solar photovoltaic conversion efficiency.