title: A high quantum efficiency preserving approach to ligand exchange on lead sulfide quantum dots and interdot resonant energy transfer.
abstract: We present a new approach to ligand exchange on lead sulfide (PbS) quantum dots (QDs) in which the QDs are reacted with preformed Pb cation-ligand exchange units designed to promote reactions that replace surface Pb and oleate groups on the as-grown QDs. This process introduces negligible surface defects as the high quantum efficiency (∼55%) of the as-grown QDs is maintained. Infrared spectroscopy and electron microscopy are used to confirm the replacement of ligands and time-resolved photoluminescence to demonstrate the expected inverse sixth power dependence of the nonradiative resonant energy transfer rate on inter-QD spacing.
authors.affiliation: Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Lingley
authors.forename: Siyuan
authors.initials: S
authors.lastname: Lu
authors.forename: Anupam
authors.initials: A
authors.lastname: Madhukar
mesh_terms: D004735:Energy Transfer; D007854:Lead / Q000737:chemistry*; D008024:Ligands; D036103:Nanotechnology; D010316:Particle Size; D045663:Quantum Dots; D011789:Quantum Theory; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D008024:Ligands; D013440:Sulfides; C018391:lead sulfide; D007854:Lead