An insight into the molecular and surface state photoluminescence of carbon dots revealed through solvent-induced modulations in their excitation wavelength dependent emission properties†,Photochemical & Photobiological Sciences

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An insight into the molecular and surface state photoluminescence of carbon dots revealed through solvent-induced modulations in their excitation wavelength dependent emission properties†
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-10-16 00:00:00 , DOI: 10.1039/c8pp00373d
Poojan Milan Gharat _{1,

2,

3,

4} , Jiddhu M. Chethodil _{4,

5,

6,

7} , Amit P. Srivastava _{2,

4,

8,

9} , Praseetha P. K. _{4,

5,

6,

7} , Haridas Pal _{1,

2,

3,

4,

10} , Sharmistha Dutta Choudhury _{1,

2,

3,

4,

10}

Affiliation

This study explores the intriguing modulations in the excitation wavelength dependence of carbon dot photoluminescence (PL), induced by the solvent medium. Our results indicate that different emissive states of carbon dots are stabilized to different extents by the surrounding solvent environment. Consequently, in some solvents, such as ethyl acetate and acetonitrile, the PL of the carbon dots is strongly dependent on the excitation wavelength, while in other solvents, like water, the PL of the same carbon dot becomes independent of the excitation wavelength. These observations contribute to the enhancement of our understanding of the photophysics and PL mechanisms of this important class of luminescent materials, especially to discriminate between the PL arising from the “molecular state” and the “surface state”.

中文翻译：

碳点的分子和表面状态光致发光的洞察力通过溶剂诱导的调制来决定其激发波长相关的发射特性†

这项研究探索了由溶剂介质引起的碳点光致发光（PL）的激发波长依赖性的有趣调制。我们的结果表明，周围溶剂环境将碳点的不同发射态稳定到不同程度。因此，在某些溶剂（例如乙酸乙酯和乙腈）中，碳点的PL强烈依赖于激发波长，而在其他溶剂（例如水）中，相同碳点的PL则与激发波长无关。这些观察结果有助于增进我们对这种重要发光材料类别的光物理和PL机理的理解，尤其是区分“分子状态”和“表面状态”引起的PL。

更新日期：2018-10-16

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