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Title: Temperature and size dependence of time-resolved exciton recombination in ZnO quantum dots
Authors: Musa, Ishaq
Keywords: Nanoparticles
Photoluminescence Quantum confinement
Issue Date: Dec-2011
Publisher: AIP- Applied Physics Letters
Citation: 22
Series/Report no.: 99;243107
Abstract: ZnO nanocrystals with various sizes were prepared and characterized. Their photoluminescence dynamics has been investigated at low temperatures. For the smallest particles (3 nm), a defect-induced long-lived photoluminescence occurs around 2.5 eV which is slowed down at decay times longer than 3 ns when sample temperature T decreases. From thermal quenching of the 2.5 eV band, the exciton dissociation energy at defect centers is estimated around ∼11.8 meV. For larger crystallites (10 and 20 nm), the ultraviolet emission observed at 3.32 eV decays in less than 85 ps and follows a Varshni law [Y. P. Varshni, Physica (Amsterdam) 34, 149 (1967)].
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