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Science 13 October 2000:
Vol. 290. no. 5490, p. 229
DOI: 10.1126/science.290.5490.229c
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This Week in Science

Electrons in nanocrystal quantum dots often can be treated as "particles in a box," and thus the separation between energy levels can be varied by changing the size of the semiconductor nanocrystal. Previous work has suggested that the excitation dynamics within the dots presented an intrinsic barrier to fully exploiting these properties. Klimov et al. (p. 314) show that a close-packed system of nanocrystal quantum dots can be used to circumvent the barrier, and they demonstrate optical gain and stimulated emission that was determined by the dot size. The results may be used to develop a new class of widely tunable, temperature-stable semiconductor lasers.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)