title: Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots.
abstract: Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm(-1), bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.
authors.affiliation: James Franck Institute, The University of Chicago , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Kwang Seob
authors.initials: KS
authors.lastname: Jeong
authors.affiliation: James Franck Institute, The University of Chicago , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Philippe
authors.initials: P
authors.lastname: Guyot-Sionnest
keywords: CdS/ZnSe; CdSe; CdSe/ZnS; CdSe/ZnSe; CdSe/ZnTe; II−VI colloidal quantum dot; intraband photoluminescence