CaSc2O4 hosted upconversion and downshifting luminescence

Nanomaterials of CaSc₂O₄:Yb/Ln (Ln = Tb, Eu) were investigated for dual-mode luminescence generation, where strong upconversion with a green/red intensity ratio as high as 45 and downshifting blue emissions were obtained at the characteristic working wavelengths of Yb³⁺ (980 nm) and Tb³⁺ (280 nm), respectively.