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

ABSTRACT: Multiphoton absorption processes enable many technologically important applications, such as in vivo imaging, photodynamic therapy and optical limiting, and so on. Specifically, higher-order nonlinear absorption such as five-photon absorption offers significant advantages of greater spatial confinement, increased penetration depth, reduced autofluorescence, enhanced sensitivity and improved resolution over lower orders in bioimaging. Organic chromophores and conventional semiconductor nanocrystals are leaders in two-/three-photon absorption applications, but face considerable challenges from their small five-photon action cross-sections. Herein, we reveal that the family of halide perovskite colloidal nanocrystals transcend these constraints with highly efficient five-photon-excited upconv

SUBMITTER: Chen W 

PROVIDER: S-EPMC5437305 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature