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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Analysis of photoluminescence from solubilized single-walled carbon nanotubes
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Analysis of photoluminescence from solubilized single-walled carbon nanotubes

机译：可溶性单壁碳纳米管的光致发光分析

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The functional form of the photoluminescence (PL) line shape from individual single-walled carbon nano-tube (SWNT) species is found to contain a significant Lorentzian component and the Stokes shift is observed to be very small (< 8 meV), which suggests an excitonic dephasing mechanism that is largely decoupled from surrounding solvent and surfactant molecules. The PL quantum yield (PLQY) of two SWNT species is determined to be ～ 5 x 10~(-4), and it is suggested that this is lower than the "true" value due to quenching of the PL in bundles by metallic tubes. Time-resolved PL measurements reveal a dominant, luminescence lifetime component of 130 ps that, when combined with a predicted natural radiative lifetime of ～ 20 ns, suggests that the true PLQY is ～ 6.5 x 10~(-3). Finally, deconvoluted PL excitation spectra are produced for eight SWNT species, and the appearance of a higher-energy excitonic subband is discussed.
机译：发现单个单壁碳纳米管（SWNT）物种的光致发光（PL）线形的功能形式包含显着的洛伦兹分量，并且观察到的斯托克斯位移非常小（<8 meV），这表明一种激子相移机制，与周围的溶剂和表面活性剂分子很大程度上脱钩。确定两个SWNT物种的PL量子产率（PLQY）为〜5 x 10〜（-4），这表明该值低于“真”值，这是由于金属管对束中的PL的淬灭。时间分辨的PL测量表明，主要的发光寿命成分为130 ps，与预计的约20 ns的自然辐射寿命结合使用时，表明真实的PLQY为约6.5 x 10〜（-3）。最后，对8种SWNT物质产生了去卷积的PL激发光谱，并讨论了高能激子子带的出现。

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