Abstract
We demonstrate that photon antibunching observed for individual nanocrystal quantum dots (NQDs) can be transformed into photon bunching characterized by super-Poissonian statistics when they are coupled to metal nanostructures (MNs). This observation indicates that, while the quantum yield of a biexciton (Q 2X) is lower than that of a single exciton (Q1X) in freestanding NQDs, Q2X becomes greater than Q1X in NQDs coupled to MNs. This unique phenomenon is attributed to metal-induced quenching with a rate that scales more slowly with exciton multiplicity than the radiative decay rate and dominates over other nonradiative decay channels for both single excitons and biexcitons.
Original language | English |
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Article number | 117401 |
Journal | Physical review letters |
Volume | 110 |
Issue number | 11 |
DOIs | |
Publication status | Published - Mar 11 2013 |
ASJC Scopus subject areas
- Physics and Astronomy(all)