Figure 1: Type I core–shell multidimensional perovskite NCs and their giant five-photon action cross-sections (ησ5). | Nature Communications

Figure 1: Type I core–shell multidimensional perovskite NCs and their giant five-photon action cross-sections (ησ5).

From: Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals

Figure 1

(a) Schematic illustrating the core–shell multidimensional perovskite NCs with 3D MAPbBr3 as core and 2D (OA)2PbBr4 as shell, and their type-I energy level alignment. (b) 5PPL spectra from core-only MAPbBr3 NCs (∼2.0 μM in toluene), core–shell MAPbBr3/(OA)2PbBr4 NCs (∼2.1 μM in toluene) and CsPbBr3 NCs (∼1.0 μM in toluene), with femtosecond laser excitation at 2,100 nm. Inset shows the quintic dependence on the excitation fluence of the spectrally integrated PL intensity. (c) Schematic illustrating the 5PPL process in perovskite NCs. (d) Five-photon action cross-section (ησ5) spectra of the MAPbBr3, MAPbBr3/(OA)2PbBr4 and CsPbBr3 NCs. Error bars indicate experimental uncertainty of ±15%.

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