Effective blue-violet photoluminescence through lanthanum and fluorine ions co-doping for CsPbCl3 perovskite quantum dots

Abstract

All-inorganic CsPbX₃ (X = Cl, Br, I) perovskite quantum dots (QDs) have received considerable attention in optoelectronic applications owing to their excellent photoluminescence properties. However, low blue-violet fluorescence emission and instability limit their practical application. Herein, we propose to improve the optical properties of CsPbCl₃ QDs by co-doping La³⁺ and F⁻ ions. The co-doped perovskite QDs were successfully synthesized using the hot injection approach, and they exhibited bright blue-violet emission and a high photoluminescence quantum yield of 36.5%, which is one order higher than that of undoped QDs. Enhanced photoluminescence performance compared to the initial CsPbCl₃ QDs could be attributed to efficient modification of defects (Cl vacancy) and increased radiative recombination rate by the introduction of the dopants. Moreover, the as-prepared La³⁺ and F⁻ ions co-doped CsPbCl₃ QDs exhibited potential application for anti-counterfeiting.