title: Luminescent InP Quantum Dots with Tunable Emission by Post-Synthetic Modification with Lewis Acids.
abstract: We demonstrate the ability of M(2+) Lewis acids (M = Cd, Zn) to dramatically enhance the photoluminescence quantum yield (PL QY) of InP quantum dots. The addition of cadmium and zinc is additionally found to red- and blue-shift, respectively, the lowest energy absorption and emission of InP quantum dots while maintaining particle size. This treatment results in a facile strategy to post-synthetically tune the luminescence color in these materials. Optical and structural characterization (XRD, TEM, XAS, ICP) have led us to identify the primary mechanism of PL turn-on as surface passivation of phosphorus dangling bonds, affording PL QYs up to 49% without the growth of a type I shell or the addition of HF. This route to PL enhancement and color tuning may prove useful as a standalone treatment or as a complement to shelling strategies.
authors.affiliation: Department of Chemistry, University of Washington , Box 351700, Bagley Hall, Seattle, Washington 98195-1700, United States.
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Stein
authors.affiliation: Department of Chemistry, Yale University , P.O. Box 208107, New Haven, Connecticut 06520, United States.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Mader
authors.affiliation: Department of Chemistry, University of Washington , Box 351700, Bagley Hall, Seattle, Washington 98195-1700, United States.
authors.forename: Brandi M
authors.initials: BM
authors.lastname: Cossairt