Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 130, Issue 1-2, Pages 425-430Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.07.001
Keywords
Quantum dots; Doping; Laser ablation; Luminescence
Categories
Funding
- Natural Science Foundation of China [50972102, 50902103]
- National High-tech R&D Program of China [2007AA021808, 2009AA03Z301]
- Research Fund for the Doctoral Program of Higher Education of China [200800560050, 20090032120024]
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Cu doping of ZnO quantum dots (QDs) was carried out by laser ablation of Zn/Cu composite targets immersed in PVP aqueous solution. Zn/Cu core-shell particles were firstly prepared by a galvanic replacement reaction, and then they were pressed into targets with different Zn/Cu ratios for laser ablation. Under the extremely non-equilibrium conditions generated by the pulse laser used, a large amount of Cu-doped ZnO QDs were produced with ultrafine size, good dispersibility, and high stability. On the other hand, the dopant concentration was feasibly controlled from 1.8% to 4.8% by changing the atomic content of Cu in Zn/Cu composite targets. Cu-doped QDs exhibited blue emission with tunable wavelength, which was ascribed to electronic transitions from the conductor band of ZnO to the acceptor levels related to Cu dopants. As a facile and versatile technique, laser ablation is believed to be an effective way for fabricating various doped nanocrystals. (C) 2011 Elsevier B.V. All rights reserved.
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