title: Photon Antibunching in Small Clusters of CdSe/ZnS Core/Shell Quantum Dots.
abstract: Coincident photon histogram measurements of fluorescence antibunching via confocal microscopy correlated with atomic force microscopy were carried out on (i) individual CdSe/ZnS core/shell quantum dots (QDs), (ii) several well separated QDs, and (iii) clusters of QDs. Individual QDs and well separated QDs showed the expected degree of antibunching for a single emitter and several independent emitters, respectively. The degree of antibunching in small, compact clusters was more characteristic of a single emitter than multiple emitters. The antibunching in clusters provides strong evidence of nonradiative energy transfer between QDs in a cluster. A minimal phenomenological model of energy transfer gives reasonable quantitative agreement with the experimental results.
authors.affiliation: †Department of Chemistry and ‡Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Whitcomb
authors.affiliation: †Department of Chemistry and ‡Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States.
authors.forename: Jessica Q
authors.initials: JQ
authors.lastname: Geisenhoff
authors.affiliation: †Department of Chemistry and ‡Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States.
authors.forename: Duncan P
authors.initials: DP
authors.lastname: Ryan
authors.affiliation: †Department of Chemistry and ‡Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States.
authors.forename: Martin P
authors.initials: MP
authors.lastname: Gelfand
authors.affiliation: †Department of Chemistry and ‡Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States.
authors.forename: Alan
authors.initials: A
authors.lastname: Van Orden