Enabling efficient near-infrared emission in lead-free double perovskite via a codoping strategy

The codoping of Ln 3+ (Ln = Yb, Nd) in the Cs 2 NaInCl 6 :Sb 3+ host not only produces PL components from visible to near-infrared regions, but also achieves a high near-infrared PLQY of ∼48.95%.