Excitation-dependent emission and highly efficient near-infrared luminescence in Cs2NaScCl6 double perovskite via Sb3+–Yb3+ alloying for multifunctional photoelectric applications

A novel Sb³⁺-Yb³⁺ co-doped Cs₂NaScCl₆ double perovskite with multimode luminescence and efficient excitation-dependent emission is proposed. Upon Sb³⁺-Yb³⁺ co-substitution in Cs₂NaScCl₆, NIR emission at 995 nm is greatly enhanced. A new STE emission peaking at 570 nm appears. Its great potential in anti-counterfeiting, LEDs and night vision is successfully demonstrated.