Research on the photoluminescence properties of Cu 2+ -doped perovskite CsPbCl 3 quantum dots

CsPbX (X = Cl, Br, and I) quantum dots (QDs) and Cu -doped CsPbCl QDs with different Cu-to-Pb molar ratios were synthesized a solvent-based thermal synthesis method. The photoluminescence (PL) properties of these Cu -doped CsPbCl QDs were also investigated in this study. The results showed that with the increase in the Cl concentration the surface defects of CsPb(Cl/Br) QDs increased, which resulted in an increase in the non-radiative recombination of excitons and weakened the PL intensity. Moreover, Cu -doped CsPbCl QDs maintained the cubic crystal structure of the initial phases. Owing to the doping of Cu ions, the surface defects of CsPbCl QDs were effectively eliminated, which facilitated the excitonic recombination a radiative pathway. The PL quantum yields (PLQYs) of Cu -doped CsPbCl QDs were increased to 51%, showing great photostability. From the results, it is believed that Cu:CsPbCl QDs can be widely used in optoelectronic devices.