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Science 13 October 2000:
Vol. 290. no. 5490, pp. 314 - 317
DOI: 10.1126/science.290.5490.314
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Reports
Optical Gain and Stimulated Emission in Nanocrystal Quantum Dots
V. I. Klimov,1*
A. A. Mikhailovsky,1
Su Xu,1
A. Malko,1
J. A. Hollingsworth,1
C. A. Leatherdale,2
H.-J. Eisler,2
M. G. Bawendi2*
The development of optical gain in chemically synthesized
semiconductor nanoparticles (nanocrystal quantum dots) has been intensely studied as the first step toward nanocrystal quantum dot
lasers. We examined the competing dynamical processes involved in
optical amplification and lasing in nanocrystal quantum dots and found
that, despite a highly efficient intrinsic nonradiative Auger
recombination, large optical gain can be developed at the wavelength of
the emitting transition for close-packed solids of these dots.
Narrowband stimulated emission with a pronounced gain threshold at
wavelengths tunable with the size of the nanocrystal was observed, as
expected from quantum confinement effects. These results unambiguously
demonstrate the feasibility of nanocrystal quantum dot lasers.
1 Chemistry Division, C-6, MS-J585, Los Alamos
National Laboratory, Los Alamos, NM 87545, USA.
2 Department of Chemistry and Center for Materials
Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
*
To whom correspondence should be addressed. E-mail:
klimov{at}lanl.gov (V.I.K.) and mgb{at}mit.edu (M.G.B.)
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