Rubidium ions doping to improve the photoluminescence properties of Mn doped CsPbCl3 perovskite quantum dots.

All-inorganic cesium lead halide CsPbX3 (X=Cl, Br, I) perovskite quantum dots (PQDs) have shown promising potential in current Mini/Micro-LED display applications due to their excellent photoluminescence performance. However, lead ions in PQDs are easily to leak owing to the unstable structure of PQDs, which hinders their commercial applications. Herein, we adopt Rb+ ions co-doping strategy to regulate the doping characteristics of Mn2+ ions in CsPbCl3 PQDs. The synthesized CsPbCl3:(Rb+, Mn2+) PQDs possess enhanced photoluminescence quantum yield of 71.1% due to the reduction of intrinsic defect states and Mn-Mn or Mn-traps in co-doped PQDs. Moreover, the white light emission of CsPb(Cl/Br)3:(Rb+, Mn2+) PQDs is achieved by anion exchange reaction and the constructed WLED exhibits the CIE coordinate of (0.33, 0.29) and the CCT of 5497 K. Benefiting from the substitution strategy, these doped CsPbX3 PQDs can be widely used as fluorescence conversion materials for the construction of Mini/Micro-LED. Keywords: perovskite quantum dots; co-doping; photoluminescence quantum yield; WLED.