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arXiv 0812.1040cond-mat.mes-hallcond-mat.mtrl-sci
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单壁碳纳米管暗激子态缺陷诱导光致发光

Defect Induced Photoluminescence from Dark Excitonic States in Individual Single-Walled Carbon Nanotubes

Hayk Harutyunyan, Tobias Gokus, Alexander A. Green, Mark C. Hersam, Maria Allegrini, Achim Hartschuh

摘要:

我们发现,新的低能量的光致发光(PL)带可以创建在半导体单壁碳纳米管的强脉冲激发。新的频带归因于PL从不同的名义上的暗激子是“明亮的”,由于缺陷引起的混合状态具有不同的奇偶校验和/或自旋。单纳米管上的时间分辨PL研究揭示了亮激子的寿命显着减少后的黑暗激子的亮度。最低能量的暗态具有较长的寿命,并且与亮态不处于热平衡。

英文摘要:

We show that new low-energy photoluminescence (PL) bands can be created in semiconducting single-walled carbon nanotubes by intense pulsed excitation. The new bands are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. Time-resolved PL studies on single nanotubes reveal a significant reduction of the bright exciton lifetime upon brightening of the dark excitons. The lowest energy dark state has longer lifetimes and is not in thermal equilibrium with the bright state.

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