title: Energy transfer in colloidal CdTe quantum dot nanoclusters.
abstract: Quantum dot (QD) nanoclusters were formed using oppositely charged colloidal CdTe QDs, of two different sizes, mixed in aqueous solutions. The photoluminescence (PL) spectra and time-resolved PL decays show signatures of Förster resonant energy transfer (FRET) from the donor QDs to the acceptor QD in the nanoclusters. A concentration dependence of the donor QD lifetime is observed in mixed solutions with a donor: acceptor ratio greater than 1:1. The concentration dependent time-resolved PL data indicate different regimes of cluster formation, with evidence for donor-to-donor FRET in the larger donor-acceptor nanoclusters and evidence for the formation of all-donor clusters in mixed solutions with high donor concentrations.
authors.affiliation: Semiconductor Photonics group, School of Physics, Trinity College Dublin, Dublin 2, Ireland.
authors.forename: Clare
authors.initials: C
authors.lastname: Higgins
authors.forename: Manuela
authors.initials: M
authors.lastname: Lunz
authors.forename: A Louise
authors.initials: AL
authors.lastname: Bradley
authors.forename: Valerie A
authors.initials: VA
authors.lastname: Gerard
authors.forename: Stephen
authors.initials: S
authors.lastname: Byrne
authors.forename: Yurii K
authors.initials: YK
authors.lastname: Gun'ko
authors.forename: Vladimir
authors.initials: V
authors.lastname: Lesnyak
authors.forename: Nikolai
authors.initials: N
authors.lastname: Gaponik