Abstract
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 sub-bandgap 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 (∼7 ps) in the time-resolved photoluminescence.
Original language | English (US) |
---|---|
Pages (from-to) | 2437-2439 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 33 |
Issue number | 21 |
DOIs | |
State | Published - Nov 1 2008 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics