Phonon line emission revealed by self-assembly of colloidal nanoplatelets.

  title={Phonon line emission revealed by self-assembly of colloidal nanoplatelets.},
  author={Micka{\"e}l D Tessier and Louis Biadala and C{\'e}cile Bouet and Sandrine Ithurria and Benjamin Ab{\'e}cassis and Benoit Dubertret},
  journal={ACS nano},
  volume={7 4},
We show that colloidal nanoplatelets can self-assemble to form a 1D superlattice. When self-assembled, an additional emission line appears in the photoluminescence spectrum at low temperatures. This emission line is a collective effect, greatly enhanced when the NPLs are self-assembled. It is attributed to the longitudinal optical (LO) phonon replica of the band-edge exciton, and its presence in self-assembled nanoplatelets is explained using a model based on an efficient photons reabsorption… CONTINUE READING