title: Complex Nature of the UV and Visible Fluorescence of Colloidal ZnO Nanoparticles.
abstract: Time-resolved spectroscopy of colloidal ZnO nanoparticles has been carried out with a laser excitation at 248 nm. UV and visible fluorescence has been analyzed. Except for the known band gap 370-nm and impurity 510-nm emissions, we have found additional continua at ∼300, 430, and 545 nm. These continua were developed in solutions of different composition, with excess Zn2+and OH-ions, and in function of time. All but 510-nm fluorescence bands exhibit short nanosecond or subnanosecond decays. The green fluorescence at 510 nm originating from 4-nm particles in Zn2+-rich solutions is a much longer-lived, 1.0 μs. The band natures are discussed. Cluster size distribution and growth kinetics have been recovered from spectral measurements.
authors.affiliation: Laboratoire d'Ingénierie des Matériaux et des Hautes Pressions, CNRS, Villetaneuse, France.
authors.forename: S
authors.initials: S
authors.lastname: Monticone
authors.affiliation: Laboratoire d'Ingénierie des Matériaux et des Hautes Pressions, CNRS, Villetaneuse, France.
authors.forename: R
authors.initials: R
authors.lastname: Tufeu
authors.affiliation: Laboratoire d'Ingénierie des Matériaux et des Hautes Pressions, CNRS, Villetaneuse, France.
authors.forename: A V
authors.initials: AV
authors.lastname: Kanaev