Brightening of excitons in carbon nanotubes on dimensionality modification
Brightening of excitons in carbon nanotubes on dimensionality modification
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DOI：
10.1038/nphoton.2013.179
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发表时间：
2013-09-01
期刊：
影响因子：
35
通讯作者：
Matsuda, Kazunari
中科院分区：
文献类型：
--
作者：
Miyauchi, Yuhei;Iwamura, Munechiyo;Matsuda, Kazunari
尽管碳纳米管（1）具有吸引人的一维特性，但由于其一维性质（2-9）而受到限制的其典型的低发光量子产率限制了基于纳米管的发光器件（10，11）的性能。在这里，我们报告了碳纳米管中激子（束缚电子-空穴对）（12，13）的显着增亮，通过人工修改其有效维度从一维到零维。作为模型系统，研究了具有由氧掺杂产生的发光的局部零维态的碳纳米管中的激子动力学。我们发现，限制在零维类态的激子的发光量子产率可以比本征一维激子的发光量子产率（通常类似于1%）大至少一个数量级（类似于18%），这不仅是因为减少了非辐射衰变途径，而且还由于增强的辐射复合概率超过了本征一维激子。我们的研究结果是可扩展的，以实现未来的纳米光子器件，包括近红外单光子发射器在室温下工作。
Despite the attractive one-dimensional characteristics of carbon nanotubes(1), their typically low luminescence quantum yield, restricted because of their one-dimensional nature(2-9), has limited the performance of nanotube-based light-emitting devices(10,11). Here, we report the striking brightening of excitons (bound electron-hole pairs)(12,13) in carbon nanotubes through an artificial modification of their effective dimensionality from one dimension to zero dimensions. Exciton dynamics in carbon nanotubes with luminescent, local zero-dimension-like states generated by oxygen doping(14) were studied as model systems. We found that the luminescence quantum yield of the excitons confined in the zero-dimension-like states can be more than at least one order larger (similar to 18%) than that of the intrinsic one-dimensional excitons (typically similar to 1%), not only because of the reduced non-radiative decay pathways but also due to an enhanced radiative recombination probability beyond that of intrinsic one-dimensional excitons. Our findings are extendable to the realization of future nanoscale photonic devices including a near-infrared single-photon emitter operable at room temperature.