Room-temperature exciton storage in elongated semiconductor nanocrystals

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Lupton, John Mark
Other Author Kraus, R. M.; Lagoudakis, P. G.; Rogach, A. L.; Talapin, D. V.; Weller, H.; Feldmann, J.
Title Room-temperature exciton storage in elongated semiconductor nanocrystals
Date 2007-01
Description The excited state of colloidal nanoheterostructures consisting of a spherical CdSe nanocrystal with an epitaxially attached CdS rod can be perturbed effectively by electric fields. Field-induced fluorescence quenching coincides with a conversion of the excited state species from the bright exciton to a metastable trapped state (dark exciton) characterized by a power-law luminescence decay. The conversion is reversible so that up to 10% of quenched excitons recombine radiatively post turn-off of a 1 us field pulse, increasing the delayed luminescence by a factor of 80. Excitons can be stored for up to 105 times the natural lifetime, opening up applications in optical memory elements.
Type Text
Publisher American Physical Society
Journal Title Physical Review Letters
Volume 98
Issue 1
First Page 017401-1
Last Page 017401-4
DOI 10.1103/PhysRevLett.98.017401
citatation_issn 0031-9007
Subject Exciton storage; Colloidal nanoheterostructures; CdSe nanocrystal
Subject LCSH Semiconductor nanocrystals; Semiconductor nanocrystals -- Optical properties
Language eng
Bibliographic Citation Kraus, R. M., Lagoudakis, P. G., Rogach, A. L., Talapin, D. V., Weller, H., Lupton, J. M., & Feldmann, J. (2007). Room-temperature exciton storage in elongated semiconductor nanocrystals. Physical Review Letters, 98, 017401.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevLett.98.017401
Format Medium application/pdf
Format Extent 226,431 bytes
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Reference URL https://collections.lib.utah.edu/ark:/87278/s6tm7vjb