Journal
COORDINATION CHEMISTRY REVIEWS
Volume 263, Issue -, Pages 197-216Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2013.09.005
Keywords
Nanocrystal quantum dots; Heterostructuring; Partial cation exchange; Blinking; Giant core/shell; Type II
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Funding
- Los Alamos National Laboratory Directed Research and Development (LDRD)
- NIH-NIGMS [1R0IGM084702-01]
- Single Investigator Small Group Research [2009LANL1096]
- Office of Basic Energy Sciences (OBES), Office of Science (OS), U.S. Department of Energy (DOE)
- Los Alamos National Security, LLC [DE-AC52-06NA25396]
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It is now well known that the optical properties of semiconductor nanocrystal quantum dots (NQDs) - absorption onset and position of the photoluminescence maximum - can be precisely controlled by simple tuning of particle size within the quantum-confinement regime. More recently, however, the field has evolved beyond straightforward particle-size control to embrace more complex NQD heterostructures. As a result of the inclusion of internal, nanoscale compositional interfaces, heterostructured NQDs afford opportunities for enhanced, emergent and even multi-functional behavior and properties. A common structural motif for achieving such 'engineered' NQDs is to envelop the NQD core within a shell of a different composition. Herein, a summary of our recent research in the development, synthesis, characterization and application of 'core/shell' NQDs is provided. In the first part, enhancement of properties is demonstrated through our work in lead chalcogenide core/shell NQDs. In a subsequent section, emergence of novel properties resulting from specific combinations of core and shell physical and electronic structures is described in the context of non-blinking behavior and suppressed Auger recombination realized for our giant NQDs. Examples in this case entail both CdSe and InP cores. Application of these ultra-stable NQDs in the area of light-emission technologies is also demonstrated and discussed. Finally, multi-functionality is shown for the case of a coupled magnetic-semiconductor Co/CdSe core/shell nanocrystal system. (C) 2013 Elsevier B.V. All rights reserved.
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