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Amino Functionalization of Carbon Dots Leads to Red Emission Enhancement.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-08-21 , DOI: 10.1021/acs.jpclett.9b01724 Evgeny V Kundelev 1 , Nikita V Tepliakov 1 , Mikhail Yu Leonov 1 , Vladimir G Maslov 1 , Alexander V Baranov 1 , Anatoly V Fedorov 1 , Ivan D Rukhlenko 1, 2 , Andrey L Rogach 1, 3
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-08-21 , DOI: 10.1021/acs.jpclett.9b01724 Evgeny V Kundelev 1 , Nikita V Tepliakov 1 , Mikhail Yu Leonov 1 , Vladimir G Maslov 1 , Alexander V Baranov 1 , Anatoly V Fedorov 1 , Ivan D Rukhlenko 1, 2 , Andrey L Rogach 1, 3
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The availability of carbon dots (CDots) with bright red photoluminescence (PL) would significantly broaden the range of their biological and optoelectronic applications. We present a theoretical model that predicts that amino functionalization of CDots not only shifts their PL to longer wavelengths but also preserves large oscillator strengths of the fundamental radiative transitions of CDots. The model considers the optical response of amino-functionalized CDots determined by molecule-like subunits of polycyclic aromatic hydrocarbons with one, two, or three -NH2 groups at the CDots' surface; the excited state of those subunits is characterized by strong charge separation between the amino groups and CDots' carbon core. Such a separation determines the Stokes shift of the CDots' emission, which increases with the growing amount of the amino functional groups at the CDot surface. Our model explains the experimentally observed dependence of the PL spectra of CDots on the excitation wavelength, the phenomenon well documented in the literature for nitrogen-containing CDots.
中文翻译：
碳点的氨基官能化导致红色发射的增强。
具有亮红色光致发光（PL）的碳点（CDots）的可用性将大大拓宽其生物和光电应用的范围。我们提出了一种理论模型，该模型预测CDots的氨基官能化不仅将其PL转移到更长的波长，而且还保留了CDots基本辐射跃迁的大振荡器强度。该模型考虑了氨基官能化CDots的光响应，该光响应由在CDots表面具有一个，两个或三个-NH2基团的多环芳烃分子样亚基确定；这些亚基的激发态的特征是氨基与CDots碳核之间的强电荷分离。这种分离决定了CDots发射的斯托克斯位移，随着CDot表面氨基官能团数量的增加而增加。我们的模型解释了实验观察到的CDots的PL光谱对激发波长的依赖性，这种现象在文献中已充分证明了含氮CDots的现象。
更新日期：2019-08-08
中文翻译：
碳点的氨基官能化导致红色发射的增强。
具有亮红色光致发光（PL）的碳点（CDots）的可用性将大大拓宽其生物和光电应用的范围。我们提出了一种理论模型，该模型预测CDots的氨基官能化不仅将其PL转移到更长的波长，而且还保留了CDots基本辐射跃迁的大振荡器强度。该模型考虑了氨基官能化CDots的光响应，该光响应由在CDots表面具有一个，两个或三个-NH2基团的多环芳烃分子样亚基确定；这些亚基的激发态的特征是氨基与CDots碳核之间的强电荷分离。这种分离决定了CDots发射的斯托克斯位移，随着CDot表面氨基官能团数量的增加而增加。我们的模型解释了实验观察到的CDots的PL光谱对激发波长的依赖性，这种现象在文献中已充分证明了含氮CDots的现象。
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