title: Frequency-dependent spontaneous emission rate from CdSe and CdTe nanocrystals: influence of dark states.
abstract: We studied the rate of spontaneous emission from colloidal CdSe and CdTe nanocrystals at room temperature. The decay rate, obtained from luminescence decay curves, increases with the emission frequency in a supralinear way. This dependence is explained by the thermal occupation of dark exciton states at room temperature, giving rise to a strong attenuation of the rate of emission. The supralinear dependence is in agreement with the results of tight-binding calculations.
authors.affiliation: Debye Institute, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht, The Netherlands. a.f.vandriel@phys.uu.nl
authors.forename: A F
authors.initials: AF
authors.lastname: van Driel
authors.forename: G
authors.initials: G
authors.lastname: Allan
authors.forename: C
authors.initials: C
authors.lastname: Delerue
authors.forename: P
authors.initials: P
authors.lastname: Lodahl
authors.forename: W L
authors.initials: WL
authors.lastname: Vos
authors.forename: D
authors.initials: D
authors.lastname: Vanmaekelbergh