Journal
OPTICS LETTERS
Volume 33, Issue 21, Pages 2437-2439Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002437
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Funding
- The Pennsylvania State University
- National Science Foundation (NSF) [CMMI-0729263]
- Army Research Office [DAAD19-02-D-0001, DURIP 2008-02-136]
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Upconverted lasing in the nonlinear, two-photon absorption regime has been demonstrated, for the first time to the best of our knowledge in colloidal nanocrystal quantum dots (NQDs). Upon pulse excitation at subbandgap photon energies the radiative recombination of excitons in close-packed CdSe/CdS/ZnS core-shell NQDs was found to be sufficiently fast to compete with the intrinsic nonradiative Auger recombination, as confirmed by the presence of a fast decay (similar to 7 ps) in the time-resolved photoluminescence. (C) 2008 Optical Society of America
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