Two-photon-pumped lasing from colloidal nanocrystal quantum dots.
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 (approximately 7 ps) in the time-resolved photoluminescence.
Zhang
Chunfeng
C
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Zhang
Fan
F
Zhu
Ting
T
Cheng
An
A
Xu
Jian
J
Zhang
Qi
Q
Mohney
Suzanne E
SE
Henderson
Ron H
RH
Wang
Y Andrew
YA