Colloidal CdSe nanocrystals are synthesized and successively overcoated with CdS monolayers (MLs). The three-photon absorption (3PA) properties are measured by Z-scan and nonlinear transmission techniques with 80 fs laser pulses at 1250 nm in the near-infrared. The 3PA enhancement factor due to the overcoating of three ML CdS was 850, significantly larger than that caused by a size increase of the CdSe cores. The 3PA enhancement mainly originates from the reduction of nonradiative traps on the cores’ surface. The effects of a local field and intrinsic piezoelectric polarization are also discussed.
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Zhu et al. (2016) studied this question.
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