Rb+ cations enable the change of luminescence properties in perovskite (RbxCs1−xPbBr3) quantum dots

All-inorganic metal halide perovskites of the formulation ABX₃ (where A is Cs⁺, B is commonly Pb²⁺, and X is a halide, X = Cl, Br, I) have been studied intensively for their unique properties.