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Room-temperature exciton storage in elongated semiconductor nanocrystals

Room-temperature exciton storage in elongated semiconductor nanocrystals
Room-temperature exciton storage in elongated semiconductor nanocrystals
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 µs 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.
0031-9007
017401-[4pp]
Kraus, R.M.
3412f013-623a-448c-a954-2e4350b9b344
Lagoudakis, P.G.
ea50c228-f006-4edf-8459-60015d961bbf
Rogach, A.L.
27195408-14d5-4184-bb03-82c462a6aaa9
Talapin, D.V.
097e3ed8-cb57-41ac-a0e3-cee79f83b8bb
Weller, H.
e6dadafe-9d4c-448e-9176-567d129765cc
Lupton, J.M.
48290c8f-dc29-47f3-9045-2281590587e9
Feldmann, J.
98d048f6-c77d-47b1-827c-256b8f04ee70
Kraus, R.M.
3412f013-623a-448c-a954-2e4350b9b344
Lagoudakis, P.G.
ea50c228-f006-4edf-8459-60015d961bbf
Rogach, A.L.
27195408-14d5-4184-bb03-82c462a6aaa9
Talapin, D.V.
097e3ed8-cb57-41ac-a0e3-cee79f83b8bb
Weller, H.
e6dadafe-9d4c-448e-9176-567d129765cc
Lupton, J.M.
48290c8f-dc29-47f3-9045-2281590587e9
Feldmann, J.
98d048f6-c77d-47b1-827c-256b8f04ee70

Kraus, R.M., Lagoudakis, P.G., Rogach, A.L., Talapin, D.V., Weller, H., Lupton, J.M. and Feldmann, J. (2007) Room-temperature exciton storage in elongated semiconductor nanocrystals. Physical Review Letters, 98 (1), 017401-[4pp]. (doi:10.1103/PhysRevLett.98.017401).

Record type: Article

Abstract

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 µs 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.

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Submitted date: 11 July 2006
Published date: 4 January 2007

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Local EPrints ID: 44867
URI: http://eprints.soton.ac.uk/id/eprint/44867
ISSN: 0031-9007
PURE UUID: aadd1ff9-4ad4-4f48-9d19-d461d99b82c4

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Date deposited: 20 Mar 2007
Last modified: 13 Mar 2019 21:06

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Contributors

Author: R.M. Kraus
Author: P.G. Lagoudakis
Author: A.L. Rogach
Author: D.V. Talapin
Author: H. Weller
Author: J.M. Lupton
Author: J. Feldmann

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