Abstract
CsPbBr2.7I0.3 two-dimensional (2D) nanoplatelets (NPs) with emission wavelengths of 469nm and 527nm were synthesized and characterized. Femtosecond transient absorption spectra revealed hot carrier cooling times of ∼368 fs and ∼438 fs for 469nm and 527nm 2D NPs, respectively. Importantly, the 2D NPs exhibit giant two-, three-, four-, and five-photon absorption cross-sections, reaching ∼4.1×106 GM at 830nm, ∼2.3×10-74 cm6 s2 photon-2 at 1300nm, 2.06×10-104 cm8 s3 photon-3 at 1600nm, and 1.50×10-136 cm10 s4 photon-4 at 2200nm, respectively, which are 3-8 orders of magnitude larger, compared to specially designed organic molecules.
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