Journal
NANO LETTERS
Volume 10, Issue 7, Pages 2401-2407Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1004652
Keywords
Nanocrystal; quantum dot; charged nanocrystal; single-dot photoluminescence; multiexciton; Auger recombination
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Funding
- US Department of Energy (DOE)
- NIH-NIGMS [1R01 GM084702-01]
- Chemical Sciences, Biosciences and Geosciences Division of the Office of Basic Energy Sciences (BES), Office of Science, US DOE
- Office of BES
- Los Alamos National Laboratory
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The development of nanocrystal quantum dots (NQDs) with suppressed nonradiative Auger recombination has been an important goal in colloidal nanostructure research motivated by the needs of prospective applications in lasing devices, light-emitting diodes, and photovoltaic cells Here, we conduct single-nanocrystal spectroscopic studies of recently developed core shell NQDs (so-called giant NQDs) that comprise a small CdSe core surrounded by a 16-monolayer-thick CdS shell Using both continuous-wave and pulsed excitation, we observe strong emission features due both to neutral and charged biexcitons, as well as multiexcitons of higher order The development of pronounced multiexcitonic peaks in steady-state photoluminescence of individual nanocrystals. as well as continuous growth of the emission intensity in the range of high pump levels, point toward a significant suppression of nonradiative Auger decay that normally renders multiexcitons nonemissive The unusually high multiexciton emission efficiencies in these systems open interesting opportunities for studies of multiexciton phenomena using well-established methods of single-dot spectroscopy, as well as new exciting prospects for applications, that have previously been hampered by nonradiative Auger decay
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