Room-temperature exciton storage in elongated semiconductor nanocrystals.

Kraus, R M; Lagoudakis, P G; Rogach, A L; Talapin, D V; Weller, H; Lupton, J M; Feldmann, J

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

Afiliación

Kraus RM; Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799 München, Germany.

Phys Rev Lett ; 98(1): 017401, 2007 Jan 05.

Article en En | MEDLINE | ID: mdl-17358504

RESUMEN

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 micro s field pulse, increasing the delayed luminescence by a factor of 80. Excitons can be stored for up to 10(5) times the natural lifetime, opening up applications in optical memory elements.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2007 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos

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