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Giant two- to five-photon absorption in CsPbBr2.7I0.3 two-dimensional nanoplatelets

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Abstract

CsPbBr2.7I0.3 two-dimensional (2D) nanoplatelets (NPs) with emission wavelengths of 469 nm and 527 nm were synthesized and characterized. Femtosecond transient absorption spectra revealed hot carrier cooling times of 368fs and 438fs for 469 nm and 527 nm 2D NPs, respectively. Importantly, the 2D NPs exhibit giant two-, three-, four-, and five-photon absorption cross-sections, reaching 4.1×106 GM at 830 nm, 2.3×1074cm6s2photon2 at 1300 nm, 2.06×10104cm8s3photon3 at 1600 nm, and 1.50×10136cm10s4photon4 at 2200 nm, respectively, which are 3–8 orders of magnitude larger, compared to specially designed organic molecules.

© 2019 Optical Society of America

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