Luminescent carbon dots with concentration-dependent emission in solution and yellow emission in solid state.,Journal of Colloid and Interface Science

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Luminescent carbon dots with concentration-dependent emission in solution and yellow emission in solid state.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.jcis.2020.01.007
Xiao-Xu Ba ₁ , Lu Zhang ₁ , Yu-Lin Yin ₁ , Feng-Lei Jiang ₁ , Peng Jiang ₂ , Yi Liu ₃

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Carbon dots (CDs) is a class of zero-dimensional carbon nanomaterials with favorable stability and optical properties. However, CDs in solid state often suffer from fluorescence quenching due to π-π stacking of conjugated systems, like most small molecules or organic dyes. Herein, we prepared the CDs that generate bright yellow luminescence in solid state without any additional matrix, meanwhile the solid CDs are inclined to assembly into spherical structure. While the CDs are dissolved in aqueous solution, the photoluminescence (PL) emission from blue to green can be realized by regulating the concentration of CDs. With the concentration increasing, the self-assembly behavior of CDs is observed in solution, which leads to the bathochromic shift of photoluminescence. Besides, the mechanism of PL conversion in this process was proposed based on the characterization results, that with the concentration of CDs rising in solution, π-π interaction was restrained while electron redistribution was induced. Consequently, a localized state II caused by electron rearrangement gradually becomes the predominant emission state, resulting in the PL emission shifting to long-wavelength region. Moreover, CDs have shown favorable potentials in the field of anti-counterfeit and multicolor bioimaging, making the CDs highly attractive for a wide variety of applications.

中文翻译：

发光碳点在溶液中具有浓度依赖性发射，在固态时具有黄色发射。

碳点（CDs）是一类零维碳纳米材料，具有良好的稳定性和光学性能。然而，由于大多数化合物（如大多数小分子或有机染料）的共轭体系的π-π堆积，固态CD经常会遭受荧光猝灭。本文中，我们制备了在固态下无需任何其他基质即可产生亮黄色发光的CD，同时固态CD倾向于组装成球形结构。当CD溶解在水溶液中时，可以通过调节CD的浓度来实现从蓝色到绿色的光致发光（PL）发射。随着浓度的增加，在溶液中观察到CD的自组装行为，这导致光致发光的红移。除了，根据表征结果，提出了该过程中PL转化的机理，即随着溶液中CDs浓度的升高，抑制了π-π相互作用，同时诱导了电子的重新分布。因此，由电子重排引起的局部状态II逐渐变为主要的发射状态，导致PL发射移至长波长区域。此外，CD在防伪和多色生物成像领域显示出了良好的潜力，这使CD具有广泛的用途。导致PL发射转移到长波长区域。此外，CD在防伪和多色生物成像领域显示出了良好的潜力，这使CD具有广泛的用途。导致PL发射转移到长波长区域。此外，CD在防伪和彩色生物成像领域显示出了良好的潜力，使CD在各种应用中具有很高的吸引力。

更新日期：2020-01-07

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