Interplay between Auger and Ionization Processes in Nanocrystal Quantum Dots
| Autor: | Andrey L. Rogach, R. M. Kraus, Pavlos G. Lagoudakis, D. V. Talapin, John M. Lupton, Jochen Feldmann, Josef Müller, Horst Weller |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Photoluminescence
Auger effect Condensed Matter::Other Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Fluorescence Surfaces Coatings and Films Auger Condensed Matter::Materials Science symbols.namesake Nanocrystal Quantum dot Ionization Physics::Atomic and Molecular Clusters Materials Chemistry symbols Physics::Atomic Physics Physical and Theoretical Chemistry Atomic physics Excitation |
| Zdroj: | The Journal of Physical Chemistry B. 109:18214-18217 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | We study the interplay between Auger effects and ionization processes in the limit of strong electronic confinement in core/shell CdSe/ZnS semiconductor nanocrystal quantum dots. Spectrally resolved fluorescence decay measurements reveal a monotonic increase of the photoluminescence decay rate on excitation density. Our results suggest that Auger recombination accelerates ionization processes that lead to the occupation of dark, nonemissive nanocrystal states. A model is proposed in the quantized Auger regime describing these experimental observations and providing an estimate of the Auger assisted ionization rates. |
| Databáze: | OpenAIRE |
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