title: Intraband Luminescence from HgSe/CdS Core/Shell Quantum Dots.
abstract: HgSe/CdS core/shell CQD are synthesized, and the changes in the optical absorption and luminescence are investigated. While HgSe quantum dots are naturally n-doped after synthesis, both as colloidal solutions and as films, the HgSe/CdS core/shell dots in solution lose the n-doping, as seen from the optical absorption in solution. However, n-doping is regained in films, and the intraband luminescence of the films of HgSe/CdS is greater than that of the cores. The shell also vastly improves the stability of the quantum dots films against sintering at 200 °C. After annealing at that temperature, the HgSe/CdS films retain a narrow intraband emission and sustain a higher laser power leading to brighter emission at 5 μm.
authors.affiliation: James Franck Institute , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Zhiyou
authors.initials: Z
authors.lastname: Deng
authors.affiliation: James Franck Institute , 929 East 57th Street, Chicago, Illinois 60637, United States.
authors.forename: Philippe
authors.initials: P
authors.lastname: Guyot-Sionnest
keywords: luminescence; mid-infrared; quantum dots