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(Journal Article) |
Journal of the American Chemical Society 128 (32): 10436-41 (2006)
Electronic coupling and exciton energy transfer in CdTe quantum-dot molecules.
Rolf Koole
,
Peter Liljeroth
,
Celso de Mello Donega
,
Daniël Vanmaekelbergh
,
Andries Meijerink
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.