Figure 3: Comparison between the PL decay traces of the perovskite NCs under various multi-photon excitations.

(a) One- and multiphoton-excited PL decay curves in MAPbBr3 NCs. (b) Longer one- and multiphoton-excited PL decay lifetimes are obtained for MAPbBr3/(OA)2PbBr4 NCs than for MAPbBr3 NCs. (c) Shorter PL decay lifetimes in CsPbBr3 NCs under one- and multiphoton excitation.