title: Electronic coupling and exciton energy transfer in CdTe quantum-dot molecules.
abstract: Stable dispersions of molecularlike aggregates of CdTe quantum dots are prepared by chemical cross-linking. Cryo-TEM images confirm the presence of cross-linked quantum dots and show that the size of the small aggregates can be controlled by the amount of cross-linker added. Optical measurements reveal two types of interdot interactions within these quantum-dot molecules: exciton energy transfer and electronic coupling. Quantitative information on the energy transfer rates in quantum-dot molecules is obtained by photoluminescence lifetime measurements. The degree of electronic coupling is dependent on the size of the quantum dots, which is supported by quantum mechanical calculations.
authors.affiliation: Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht, The Netherlands. r.koole@phys.uu.nl
authors.forename: Rolf
authors.initials: R
authors.lastname: Koole
authors.forename: Peter
authors.initials: P
authors.lastname: Liljeroth
authors.forename: Celso
authors.initials: C
authors.lastname: de Mello Donega
authors.forename: Daniël
authors.initials: D
authors.lastname: Vanmaekelbergh
authors.forename: Andries
authors.initials: A
authors.lastname: Meijerink