Single-Photon Emission Behavior of Isolated CdSe/ZnS Quantum Dots Interacting with the Localized Surface Plasmon Resonance of Silver Nanoparticles
| Autor: | Akira Itaya, Shinjiro Machida, Hiroyuki Naiki, Sadahiro Masuo |
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| Rok vydání: | 2011 |
| Předmět: |
Photon antibunching
Chemistry Exciton Analytical chemistry Physics::Optics Laser Molecular physics Fluorescence Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science General Energy law Quantum dot Physical and Theoretical Chemistry Surface plasmon resonance Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 115:23299-23304 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp207997j |
| Popis: | To reveal the exciton dynamics, particularly multiexciton dynamics in single colloidal CdSe/ZnS quantum dots (QDs) interacting with the localized surface plasmon resonance (LSPR) of silver nanoparticles (AgNPs), we investigated the single-photon emission behavior in the fluorescence from the single QDs using a single-molecule spectroscopy technique in combination with a femtosecond-pulsed laser excitation. By applying simultaneous measurements of the photon-correlation (photon antibunching), the fluorescence intensity, and the fluorescence lifetime to the single QD near AgNPs, we revealed that the probability of single-photon emission strongly depended on the fluorescence lifetime; that is, the probability of single-photon emission decreased when the lifetime was shorter than subnanoseconds. On the basis of the estimation of both radiative and nonradiative decay rates enhanced by the LSPR, the following mechanism was suggested. In the absence of AgNPs, multiple excitons generated by a high-power excitatio... |
| Databáze: | OpenAIRE |
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