A new yttrium oxysulfide-based multispectral IR phosphor activated with Nd³⁺ and Yb³⁺ ions

Abstract

We have identified the main general trends of variations in the spectral and kinetic properties of the Nd³⁺ and Yb³⁺ IR luminescence bands in (Y_0.99–x Nd_0.01Yb_x)₂O₂S solid solutions under excitation at wavelengths of 0.810 and 0.940 µm. Using these results, we have developed the first multispectral IR phosphors with various relative intensities of the IR luminescence bands in the ranges 0.88–0.94, 0.94–1.06, 1.06–1.12, and 1.35–1.42 µm under excitation with 0.810-µm light and bright IR luminescence in the range 0.94–1.06 µm under excitation with 0.940-µm light.