Klimov V I, Mikhailovsky A A, Xu S, Malko A, Hollingsworth J A, Leatherdale C A, Eisler H, Bawendi M G
Chemistry Division, C-6, MS-J585, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Science. 2000 Oct 13;290(5490):314-7. doi: 10.1126/science.290.5490.314.
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.
作为迈向纳米晶体量子点激光器的第一步，人们对化学合成半导体纳米颗粒（纳米晶体量子点）中的光学增益发展进行了深入研究。我们研究了纳米晶体量子点中光学放大和激光发射所涉及的相互竞争的动力学过程，发现尽管存在高效的本征非辐射俄歇复合，但对于这些量子点的紧密堆积固体，在发射跃迁波长处仍可产生大的光学增益。正如量子限制效应所预期的那样，可以观察到在与纳米晶体尺寸可调谐的波长处具有明显增益阈值的窄带受激发射。这些结果明确证明了纳米晶体量子点激光器的可行性。
