Formation and fluorescent mechanism of red emissive carbon dots from <italic style="font-style: italic">o</italic>-phenylenediamine and catechol system

Pengfei Li; Shanshan Xue; Lu Sun; Xupeng Zong; Li An; Dan Qu; Xiayan Wang; Zaicheng Sun

doi:10.1038/s41377-022-00984-5

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Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system

Original Articles

- Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system
- Light: Science & Applications Vol. 11, Issue 11, Pages: 2687-2697(2022)
- Affiliations：
  
  Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Beijing University of Technology, 100124, Beijing, China
- Author bio：
  
  Zaicheng Sun (sunzc@bjut.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00984-5
  CLC：
- Published：30 November 2022，
  
  Published Online：13 October 2022，
  
  Received：09 April 2022，
  
  Revised：31 August 2022，
  
  Accepted：15 September 2022
- Accepted：
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Li, P. F. et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system. Light: Science & Applications, 11, 2687-2697 (2022).
DOI：

Li, P. F. et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system. Light: Science & Applications, 11, 2687-2697 (2022). DOI： 10.1038/s41377-022-00984-5.

摘要

Abstract

Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However

the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein

red emissive CDs were synthesized in high yield from

-phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5

14-dihydroquinoxalino[2

3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these

we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs

the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine

dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.

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Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system

DOI：10.1038/s41377-022-00984-5

摘要

Abstract

关键词

Keywords

references