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

YAG: 0.02Cr ³⁺, yYb ³⁺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 Cr ³⁺and Yb ³⁺, luminescence lifetimes of Cr ³⁺: ⁴T ₂and Yb ³⁺: ²F _5/2and comparison of their population time. Optimal doping concentration of Yb ³⁺(10%) is given. Experiments indicate that the broadband spectral conversion makes the Yb ³⁺: ²F _5/2→ ²F _7/2radiation transition obtain a favorable increase around 1 000 nm by the efficient energy transfer from Cr ³⁺to Yb ³⁺, which laids a solid foundation to enhance solar photovoltaic conversion efficiency.