title: Efficient synthesis of highly luminescent copper indium sulfide-based core/shell nanocrystals with surprisingly long-lived emission.
abstract: We report an efficient synthesis of copper indium sulfide nanocrystals with strong photoluminescence in the visible to near-infrared. This method can produce gram quantities of material with a chemical yield in excess of 90% with minimal solvent waste. The overgrowth of as-prepared nanocrystals with a few monolayers of CdS or ZnS increases the photoluminescence quantum efficiency to > 80%. On the basis of time-resolved spectroscopic studies of core/shell particles, we conclude that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.
authors.affiliation: Center for Advanced Solar Photophysics, C-PCS, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
authors.forename: Liang
authors.initials: L
authors.lastname: Li
authors.forename: Anshu
authors.initials: A
authors.lastname: Pandey
authors.forename: Donald J
authors.initials: DJ
authors.lastname: Werder
authors.forename: Bishnu P
authors.initials: BP
authors.lastname: Khanal
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Pietryga
authors.forename: Victor I
authors.initials: VI
authors.lastname: Klimov