On the Molecular Origin of Photoluminescence of Nonblinking Carbon Dot,The Journal of Physical Chemistry C

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On the Molecular Origin of Photoluminescence of Nonblinking Carbon Dot
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-04-24 00:00:00 , DOI: 10.1021/acs.jpcc.7b02433
Ananya Das ₁ , Venkatesh Gude ₁ , Debjit Roy ₁ , Tanmay Chatterjee ₁ , Chayan K. De ₁ , Prasun K. Mandal ₁

Affiliation

The molecular origin of the photoluminescence (PL) of carbon dots (CDs) is not fully understood. In this article it is shown that CDs are composed of aggregated 2-pyridone derivatives employing π–π stacking and H-bonding, etc. The PL quantum yield of this CD is quite high in aqueous medium (∼75%). Unlike literature reports the PL emission maximum of this CD is excitation wavelength independent, and PL decay follows a single-exponential decay equation. These CDs have a long PL lifetime (from ∼10 to 15 ns), so that solvation is complete before emission. The extent of trap states could be reduced quite significantly. A high PLQY and long and single-exponential PL lifetime and it’s polarity dependence would make this CD a suitable probe for FRET and FLIM. It could be shown that unlike literature reports this CD as a single particle does not blink. Unlike literature reports where CDs are bleached within a few seconds these CDs at the single-particle level are alive for about a few minutes. All these aggregation-induced much improved optical properties will make this CD a suitable optical emitter at the ensemble as well as single-particle level toward bioimaging. As the molecular origin is now known several optical properties can now be tuned.

中文翻译：

非闪烁碳点光致发光的分子起源

碳点（CD）的光致发光（PL）的分子起源尚不完全清楚。本文表明，CD由π-π堆积和H键等的聚集的2-吡啶酮衍生物组成。该CD在水介质中的PL量子产率很高（约75％）。与文献报道不同，此CD的PL发射最大值与激发波长无关，并且PL衰减遵循单指数衰减方程。这些CD具有较长的PL寿命（约10至15 ns），因此在发射前溶剂化已完成。陷阱状态的程度可以大大降低。较高的PLQY和长且单指数的PL寿命，以及其极性相关性，将使该CD成为FRET和FLIM的合适探针。可以证明，与文献报道不同，该CD由于单个粒子不会闪烁。与文献报道中CD在几秒钟内被漂白不同，这些CD在单粒子水平上可以存活约几分钟。所有这些聚集诱导的大大改善的光学性质将使该CD成为整体上合适的光学发射体，以及朝向生物成像的单粒子水平。由于已知分子起源，因此现在可以调节几种光学性质。

更新日期：2017-04-24

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