Radiative lifetimes and coherence lengths of one-dimensional excitons in single-walled carbon nanotubes
Radiative lifetimes and coherence lengths of one-dimensional excitons in single-walled carbon nanotubes
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DOI：
10.1103/physrevb.80.081410
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发表时间：
2009-08-01
影响因子：
3.7
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Miyauchi, Yuhei;Hirori, Hideki;Kanemitsu, Yoshihiko
研究了单壁碳纳米管（SWNTs）的辐射寿命和一维激子相干长度。通过同时测量光致发光（PL）寿命和PL量子产率确定的辐射寿命范围从3到10 ns不等，并且随着管直径的增加而略有增加。根据实验得到的辐射寿命推断，单壁碳纳米管中的激子相干长度约为10 nm，约为激子沿管轴的玻尔半径的10倍。
We evaluated the radiative lifetimes and the one-dimensional exciton coherence lengths in single-walled carbon nanotubes (SWNTs). The radiative lifetimes determined from simultaneous measurements of photoluminescence (PL) lifetimes and PL quantum yields range from similar to 3 to 10 ns, and slightly increase with the tube diameter. The exciton coherence lengths in SWNTs are of the order of 10 nm, as deduced from the experimentally obtained radiative lifetimes, and they are about ten times larger than the exciton Bohr radius along the tube axis.